CA2994098C - Power supply system and dummy load device - Google Patents
Power supply system and dummy load device Download PDFInfo
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- CA2994098C CA2994098C CA2994098A CA2994098A CA2994098C CA 2994098 C CA2994098 C CA 2994098C CA 2994098 A CA2994098 A CA 2994098A CA 2994098 A CA2994098 A CA 2994098A CA 2994098 C CA2994098 C CA 2994098C
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/001—Hot plugging or unplugging of load or power modules to or from power distribution networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
- Dc-Dc Converters (AREA)
Abstract
Provided is a power supply system which is capable of consuming surplus power which has not been consumed, using a simple configuration. In a sea floor device 20, main DC/DC converters 64, 66 convert first DC power supplied to a primary side into second DC power, and output the second DC power to a secondary side, and a control unit 70 and an output unit 80 distribute the second DC power to a dummy load device 90 and at least one observation device 100 (apparatus). The dummy load device 90 is connected to the primary side or the secondary side of the main DC/DC converters 64, 66, and consumes surplus power of the first DC power and the second DC power in accordance with the increase/decrease in the number of observation devices 100 connected to the control unit 70 and the output unit 80.
Description
CA 02994098 2018.-01-29 . , DESCRIPTION
POWER SUPPLY SYSTEM AND DUMMY LOAD DEVICE
Technical Field [0001]
The present invention relates to a power supply system suitable for consumption of surplus power.
Background Art
POWER SUPPLY SYSTEM AND DUMMY LOAD DEVICE
Technical Field [0001]
The present invention relates to a power supply system suitable for consumption of surplus power.
Background Art
[0002]
Conventionally, a technique has been known in which relay devices that reproduce or amplify communication signals are mounted on a large number of subsea devices, respectively, and these subsea devices are connected in a chain shape by subsea cables and laid on the seafloor spreading between two points on shore in this state, in subsea cable communication systems. Power lines are mounted to such subsea cables, and power supply circuits provided in the respective subsea devices are connected in series to the power lines. Further, it is configured such that a DC
having a constant value (DC constant current) is transmitted from an onshore power supply device arranged at both ends on shore to this power line, and each of the subsea devices uses the amount of a voltage drop of the DC
constant current as power.
Conventionally, a technique has been known in which relay devices that reproduce or amplify communication signals are mounted on a large number of subsea devices, respectively, and these subsea devices are connected in a chain shape by subsea cables and laid on the seafloor spreading between two points on shore in this state, in subsea cable communication systems. Power lines are mounted to such subsea cables, and power supply circuits provided in the respective subsea devices are connected in series to the power lines. Further, it is configured such that a DC
having a constant value (DC constant current) is transmitted from an onshore power supply device arranged at both ends on shore to this power line, and each of the subsea devices uses the amount of a voltage drop of the DC
constant current as power.
[0003]
In the above-described subsea cable communication system, however, it is configured such that it is possible to distribute a constant amount of power to all the subsea devices connected to the subsea cables by allocating the amount of power that needs to be consumed to each of the subsea devices.
Thus, when power is not supplied to an observation device despite a state where the subsea device can supply power, it is necessary to consume the entire power that needs to be consumed by the observation device with a dummy load device. That is, the dummy load device is configured to consume surplus power, which is no longer consumed by the observation device in a non-power supply state (not in a power supply state), out of the power allocated to the subsea device.
In the above-described subsea cable communication system, however, it is configured such that it is possible to distribute a constant amount of power to all the subsea devices connected to the subsea cables by allocating the amount of power that needs to be consumed to each of the subsea devices.
Thus, when power is not supplied to an observation device despite a state where the subsea device can supply power, it is necessary to consume the entire power that needs to be consumed by the observation device with a dummy load device. That is, the dummy load device is configured to consume surplus power, which is no longer consumed by the observation device in a non-power supply state (not in a power supply state), out of the power allocated to the subsea device.
[0004]
The inventions described in Patent Documents 1 (JP
5176152 B2) and 2 (JP 11-150492 A) have been known as examples of the power supply system having such a configuration.
Patent Document 1 which is JP 5176152 B2 aims to prevent received power on an input side from changing with respect to an output load change. A first circuit receives a DC constant current at a primary input port, detects a voltage of a secondary port as an output, and controls a first switching circuit on a primary side such that this first voltage detection value becomes a constant value, thereby outputting a DC constant voltage to the secondary port. A second circuit receives the DC constant voltage output from the secondary port of the first circuit, converts the received DC constant voltage into a constant current by a constant current circuit, and supplies the converted constant current to an external load connected to a tertiary port as a final output. Thus, disclosed is a balanced DC constant current input/DC constant current distribution output device having a configuration in which the third circuit receives the voltage generated on the primary side of the first circuit as a primary side input voltage, detects this primary side voltage, and controls a second switching circuit on a primary side such that this second voltage detection value becomes a constant value, thereby supplying power to a constant resistance load connected to a secondary side.
The inventions described in Patent Documents 1 (JP
5176152 B2) and 2 (JP 11-150492 A) have been known as examples of the power supply system having such a configuration.
Patent Document 1 which is JP 5176152 B2 aims to prevent received power on an input side from changing with respect to an output load change. A first circuit receives a DC constant current at a primary input port, detects a voltage of a secondary port as an output, and controls a first switching circuit on a primary side such that this first voltage detection value becomes a constant value, thereby outputting a DC constant voltage to the secondary port. A second circuit receives the DC constant voltage output from the secondary port of the first circuit, converts the received DC constant voltage into a constant current by a constant current circuit, and supplies the converted constant current to an external load connected to a tertiary port as a final output. Thus, disclosed is a balanced DC constant current input/DC constant current distribution output device having a configuration in which the third circuit receives the voltage generated on the primary side of the first circuit as a primary side input voltage, detects this primary side voltage, and controls a second switching circuit on a primary side such that this second voltage detection value becomes a constant value, thereby supplying power to a constant resistance load connected to a secondary side.
[0005]
Patent Document 2 which is JP 11-150492 A aims to prevent supply of constant current from being affected even if there is a large change in power consumption. A subsea cable system of a constant current power supply system includes: a switching circuit which is connected in series to a constant current line and converts a constant current into a rectangular wave current; a transformer which converts the rectangular wave current to another rectangular wave current; and a rectifier circuit which rectifies an output of the transformer, in which the high-voltage constant current is insulated by the switching circuit, the transformer, and the rectifier circuit to be electrically isolated from a load side. Thus, disclosed is a power supply circuit for 3a , the subsea cable system having a configuration in which a Zener diode is connected to an output of the rectifier circuit, and with regard to a voltage of a low-voltage side isolated by the transformer and rectified by the rectifier circuit, a current change of a load is absorbed by the Zener diode.
Prior Art Documents Patent Documents
Patent Document 2 which is JP 11-150492 A aims to prevent supply of constant current from being affected even if there is a large change in power consumption. A subsea cable system of a constant current power supply system includes: a switching circuit which is connected in series to a constant current line and converts a constant current into a rectangular wave current; a transformer which converts the rectangular wave current to another rectangular wave current; and a rectifier circuit which rectifies an output of the transformer, in which the high-voltage constant current is insulated by the switching circuit, the transformer, and the rectifier circuit to be electrically isolated from a load side. Thus, disclosed is a power supply circuit for 3a , the subsea cable system having a configuration in which a Zener diode is connected to an output of the rectifier circuit, and with regard to a voltage of a low-voltage side isolated by the transformer and rectified by the rectifier circuit, a current change of a load is absorbed by the Zener diode.
Prior Art Documents Patent Documents
[0006]
Patent Document 1: JP 5176152 B2 Patent Document 2: JP 11-150492 A
Summary of the Invention Problems to be Solved by the Invention
Patent Document 1: JP 5176152 B2 Patent Document 2: JP 11-150492 A
Summary of the Invention Problems to be Solved by the Invention
[0007]
In this manner, in Patent Document 1, the third circuit is configured so as to supply the power to the constant resistance load connected to the secondary side of the second switching circuit by receiving the voltage generated on the primary side of the first circuit as the primary side input voltage and controlling the second switching circuit on the primary side such that the second voltage detection value which is the primary side voltage detection value becomes the constant value, whereby the surplus power which is no longer consumed in an observation device (not in a power supply state) is consumed by the constant resistance load.
In Patent Document 1, however, a space for mounting the third circuit is required due to complexity as the number of parts constituting the third circuit increases.
In addition, the surplus power that is no longer consumed in the observation device in the non-power supply state out of power allocated to the single subsea device is consumed by the dummy load system in the conventional subsea device as described above. At this time, feedback control is performed between a DC power conversion device configured to supply power to the observation device and the dummy load device such that power balance between the DC power conversion device and the dummy load device is held at an optimally stable point.
However, circuit configurations of both the DC power conversion device and the dummy load device become complex when performing the feedback control between the devices.
In this manner, in Patent Document 1, the third circuit is configured so as to supply the power to the constant resistance load connected to the secondary side of the second switching circuit by receiving the voltage generated on the primary side of the first circuit as the primary side input voltage and controlling the second switching circuit on the primary side such that the second voltage detection value which is the primary side voltage detection value becomes the constant value, whereby the surplus power which is no longer consumed in an observation device (not in a power supply state) is consumed by the constant resistance load.
In Patent Document 1, however, a space for mounting the third circuit is required due to complexity as the number of parts constituting the third circuit increases.
In addition, the surplus power that is no longer consumed in the observation device in the non-power supply state out of power allocated to the single subsea device is consumed by the dummy load system in the conventional subsea device as described above. At this time, feedback control is performed between a DC power conversion device configured to supply power to the observation device and the dummy load device such that power balance between the DC power conversion device and the dummy load device is held at an optimally stable point.
However, circuit configurations of both the DC power conversion device and the dummy load device become complex when performing the feedback control between the devices.
[0008]
Further, the dummy load device can be implemented using the Zener diode, but needs to be connected at multiple stages when being used at high power and high voltage, such multi-stage connection is problematic in terms of stability and reliability due to a characteristic variation of each element.
Specifically, the Zener diode is a semiconductor element obtained by PN-junction of a semiconductor.
Practically, characteristics of commercially available CA 02994098 2018.-019 Zener diodes vary by about 5% to 10% due to manufacturing errors or the like. Incidentally, a highly accurate type with little characteristic variation also exists, but is extremely expensive.
When connected at the multiple stages to consume the high power and high voltage as in this case, the characteristic variations of the elements accumulate so that it is difficult to obtain characteristics as expected.
Incidentally, the use of the highly accurate Zener diodes connected in the multiple stages requires high cost.
In general, when a current starts to flow, a constant voltage property of the Zener diode begins to fluctuate and collapse. An example in which a current of 8 A is caused to flow to the Zener diode is described, for example, in the paragraph [0035] of Patent Document 2, but there is a disadvantage that the voltage stability is inferior.
Thus, there has been a request for provision of a dummy load device with a simple configuration that can consume the surplus power that is no longer consumed in the observation device (in the non-power supply state).
The present invention has been made in view of the above-described problem, and an object thereof is to provide a power supply system capable of consuming surplus power that is no longer consumed with a simple configuration.
Means for Solving the Problem
Further, the dummy load device can be implemented using the Zener diode, but needs to be connected at multiple stages when being used at high power and high voltage, such multi-stage connection is problematic in terms of stability and reliability due to a characteristic variation of each element.
Specifically, the Zener diode is a semiconductor element obtained by PN-junction of a semiconductor.
Practically, characteristics of commercially available CA 02994098 2018.-019 Zener diodes vary by about 5% to 10% due to manufacturing errors or the like. Incidentally, a highly accurate type with little characteristic variation also exists, but is extremely expensive.
When connected at the multiple stages to consume the high power and high voltage as in this case, the characteristic variations of the elements accumulate so that it is difficult to obtain characteristics as expected.
Incidentally, the use of the highly accurate Zener diodes connected in the multiple stages requires high cost.
In general, when a current starts to flow, a constant voltage property of the Zener diode begins to fluctuate and collapse. An example in which a current of 8 A is caused to flow to the Zener diode is described, for example, in the paragraph [0035] of Patent Document 2, but there is a disadvantage that the voltage stability is inferior.
Thus, there has been a request for provision of a dummy load device with a simple configuration that can consume the surplus power that is no longer consumed in the observation device (in the non-power supply state).
The present invention has been made in view of the above-described problem, and an object thereof is to provide a power supply system capable of consuming surplus power that is no longer consumed with a simple configuration.
Means for Solving the Problem
[0009]
In order to solve the above-described problem, the invention described in the description is a power supply system including: a parent device which has a power supply means and a control means; and a child device which is connected to the parent device via a cable, and is characterized in that the child device includes: a DC power conversion unit which converts first DC power supplied to a primary side into second DC power and outputs the second DC
power to a secondary side; and a power distribution unit which distributes the second DC power to a dummy load device and at least one of devices, wherein the dummy load device includes a plurality of dummy load units connected in series, and each of the dummy load units includes:
an inter-terminal voltage monitoring unit which monitors a voltage applied between both terminals of the dummy load unit to generate a first control voltage and adjusts a level of the first control voltage such that the voltage applied between both the terminals is constant;
a control voltage amplification unit which amplifies the first control voltage generated by the inter-terminal voltage monitoring unit to generate a second control voltage; and a power consumption unit which causes a power semiconductor to consume power by causing a required current to flow to the power semiconductor according to the second control voltage generated by the control voltage amplification unit, wherein the dummy load device includes a plurality of dummy load units connected in series, and each of the dummy load units includes: an inter-terminal voltage monitoring unit which monitors a voltage applied between both terminals of the dummy load unit to generate a first control voltage and adjusts a level of the first control voltage such that the voltage applied between both the terminals is constant; a control voltage amplification unit which amplifies the first control voltage generated by the inter-terminal voltage monitoring unit to generate a second control voltage; and a power consumption unit which causes a power semiconductor to consume power by causing a required current to flow to the power semiconductor according to the second control voltage generated by the control voltage amplification unit, and the dummy load device is connected to the primary side or the secondary side of the DC power conversion unit and consumes surplus power out of the first DC power or the second DC power in accordance with an increase or a decrease of the number of the devices connected to the power distribution unit.
According to the present invention, there is provided a dummy load device comprising a plurality of dummy load units connected in series, wherein each of the dummy load units includes:
7a an inter-terminal voltage monitoring unit which monitors a voltage applied between both terminals of the dummy load unit to generate a first control voltage and adjusts a level of the first control voltage such that the voltage applied between both the terminals is constant;
a control voltage amplification unit which amplifies the first control voltage generated by the inter-terminal voltage monitoring unit to generate a second control voltage; and a power consumption unit which causes a power semiconductor to consume power by causing a required current to flow to the power semiconductor according to the second control voltage generated by the control voltage amplification unit.
Effects of the Invention
In order to solve the above-described problem, the invention described in the description is a power supply system including: a parent device which has a power supply means and a control means; and a child device which is connected to the parent device via a cable, and is characterized in that the child device includes: a DC power conversion unit which converts first DC power supplied to a primary side into second DC power and outputs the second DC
power to a secondary side; and a power distribution unit which distributes the second DC power to a dummy load device and at least one of devices, wherein the dummy load device includes a plurality of dummy load units connected in series, and each of the dummy load units includes:
an inter-terminal voltage monitoring unit which monitors a voltage applied between both terminals of the dummy load unit to generate a first control voltage and adjusts a level of the first control voltage such that the voltage applied between both the terminals is constant;
a control voltage amplification unit which amplifies the first control voltage generated by the inter-terminal voltage monitoring unit to generate a second control voltage; and a power consumption unit which causes a power semiconductor to consume power by causing a required current to flow to the power semiconductor according to the second control voltage generated by the control voltage amplification unit, wherein the dummy load device includes a plurality of dummy load units connected in series, and each of the dummy load units includes: an inter-terminal voltage monitoring unit which monitors a voltage applied between both terminals of the dummy load unit to generate a first control voltage and adjusts a level of the first control voltage such that the voltage applied between both the terminals is constant; a control voltage amplification unit which amplifies the first control voltage generated by the inter-terminal voltage monitoring unit to generate a second control voltage; and a power consumption unit which causes a power semiconductor to consume power by causing a required current to flow to the power semiconductor according to the second control voltage generated by the control voltage amplification unit, and the dummy load device is connected to the primary side or the secondary side of the DC power conversion unit and consumes surplus power out of the first DC power or the second DC power in accordance with an increase or a decrease of the number of the devices connected to the power distribution unit.
According to the present invention, there is provided a dummy load device comprising a plurality of dummy load units connected in series, wherein each of the dummy load units includes:
7a an inter-terminal voltage monitoring unit which monitors a voltage applied between both terminals of the dummy load unit to generate a first control voltage and adjusts a level of the first control voltage such that the voltage applied between both the terminals is constant;
a control voltage amplification unit which amplifies the first control voltage generated by the inter-terminal voltage monitoring unit to generate a second control voltage; and a power consumption unit which causes a power semiconductor to consume power by causing a required current to flow to the power semiconductor according to the second control voltage generated by the control voltage amplification unit.
Effects of the Invention
[0010]
According to the present invention, it is possible to provide a power supply system capable of consuming surplus power that is no longer consumed with a simple configuration.
Brief Description of the Drawings
According to the present invention, it is possible to provide a power supply system capable of consuming surplus power that is no longer consumed with a simple configuration.
Brief Description of the Drawings
[0011]
7b Fig. 1 is a block diagram for describing a schematic configuration of a power supply system according to a first embodiment of the present invention.
Fig. 2 is a block diagram for describing a configuration of a subsea device provided in the power supply system according to the first embodiment of the present invention.
Fig. 3 is a block diagram for describing a more detailed connection relationship between a main DC/DC
converter and an output DC/DC converter which are illustrated in Fig. 2 and used in the power supply system according to the first embodiment of the present invention.
Fig. 4 is a block diagram illustrating a dummy load unit as one unit of a dummy load device used in the power supply system according to the first embodiment of the present invention.
Fig. 5 is a graph regarding a voltage, time, and a current that represents an operation when an input voltage is input to the dummy load unit which is one unit of the dummy load device used in the power supply system according to the first embodiment of the present invention while changing the input voltage.
Fig. 6 is a graph regarding a voltage, time, and a current that represents an operation when a load change is applied to the dummy load unit as one unit of the dummy load device used in the power supply system according to the first embodiment of the present invention.
Figs. 7(a) to 7(f) are sequence diagrams (Part 1) for describing a start-up operation of each device provided in the power supply system according to the first embodiment of the present invention.
Figs. 8(a) to 8(g) are sequence diagrams (part 2) for describing the start-up operation of each device provided in the power supply system according to the first embodiment of the present invention.
Fig. 9 is a block diagram illustrating a dummy load unit as one unit of a dummy load device used in a power supply system according to a second embodiment of the present invention.
Fig. 10 is a block diagram illustrating a dummy load unit as one unit of a dummy load device used in a power supply system according to a third embodiment of the present invention.
Fig. 11 is a block diagram for describing a configuration of a subsea device provided in a power supply system according to a fourth embodiment of the present Invention.
Fig. 12 is a block diagram for describing a more detailed connection relationship between a main DC/DC
converter and an output DC/DC converter which are illustrated in Fig. 11 and used in the power supply system according to the fourth embodiment of the present invention.
Best Mode for Carrying Out the Invention A
7b Fig. 1 is a block diagram for describing a schematic configuration of a power supply system according to a first embodiment of the present invention.
Fig. 2 is a block diagram for describing a configuration of a subsea device provided in the power supply system according to the first embodiment of the present invention.
Fig. 3 is a block diagram for describing a more detailed connection relationship between a main DC/DC
converter and an output DC/DC converter which are illustrated in Fig. 2 and used in the power supply system according to the first embodiment of the present invention.
Fig. 4 is a block diagram illustrating a dummy load unit as one unit of a dummy load device used in the power supply system according to the first embodiment of the present invention.
Fig. 5 is a graph regarding a voltage, time, and a current that represents an operation when an input voltage is input to the dummy load unit which is one unit of the dummy load device used in the power supply system according to the first embodiment of the present invention while changing the input voltage.
Fig. 6 is a graph regarding a voltage, time, and a current that represents an operation when a load change is applied to the dummy load unit as one unit of the dummy load device used in the power supply system according to the first embodiment of the present invention.
Figs. 7(a) to 7(f) are sequence diagrams (Part 1) for describing a start-up operation of each device provided in the power supply system according to the first embodiment of the present invention.
Figs. 8(a) to 8(g) are sequence diagrams (part 2) for describing the start-up operation of each device provided in the power supply system according to the first embodiment of the present invention.
Fig. 9 is a block diagram illustrating a dummy load unit as one unit of a dummy load device used in a power supply system according to a second embodiment of the present invention.
Fig. 10 is a block diagram illustrating a dummy load unit as one unit of a dummy load device used in a power supply system according to a third embodiment of the present invention.
Fig. 11 is a block diagram for describing a configuration of a subsea device provided in a power supply system according to a fourth embodiment of the present Invention.
Fig. 12 is a block diagram for describing a more detailed connection relationship between a main DC/DC
converter and an output DC/DC converter which are illustrated in Fig. 11 and used in the power supply system according to the fourth embodiment of the present invention.
Best Mode for Carrying Out the Invention A
[0012]
Hereinafter, the present invention will be described in detail with reference to embodiments illustrated in the drawings.
The present invention has the following configuration in order to provide a power supply system capable of consuming surplus power that is no longer consumed with a simple configuration.
That is, the power supply system of the present invention is a power supply system including: a parent device which has a power supply means and a control means;
and a child device which is connected to the parent device via a cable, and is characterized in that the child device includes: a DC power conversion unit which converts first DC power supplied to a primary side into second DC power and outputs the second DC power to a secondary side; a power distribution unit which distributes the second DC
power to a dummy load device and at least one of devices;
and the dummy load device which is connected to the primary side or the secondary side of the DC power conversion unit and consumes surplus power out of the first DC power or the second DC power in accordance with an increase or a decrease of the number of the devices connected to the power distribution unit.
With the above configuration, it is possible to provide a power supply system capable of consuming surplus power that is no longer consumed with a simple configuration.
Hereinafter, the above-described features of the present invention will be described in detail with reference to the drawings.
Hereinafter, the present invention will be described in detail with reference to embodiments illustrated in the drawings.
The present invention has the following configuration in order to provide a power supply system capable of consuming surplus power that is no longer consumed with a simple configuration.
That is, the power supply system of the present invention is a power supply system including: a parent device which has a power supply means and a control means;
and a child device which is connected to the parent device via a cable, and is characterized in that the child device includes: a DC power conversion unit which converts first DC power supplied to a primary side into second DC power and outputs the second DC power to a secondary side; a power distribution unit which distributes the second DC
power to a dummy load device and at least one of devices;
and the dummy load device which is connected to the primary side or the secondary side of the DC power conversion unit and consumes surplus power out of the first DC power or the second DC power in accordance with an increase or a decrease of the number of the devices connected to the power distribution unit.
With the above configuration, it is possible to provide a power supply system capable of consuming surplus power that is no longer consumed with a simple configuration.
Hereinafter, the above-described features of the present invention will be described in detail with reference to the drawings.
[0013]
Embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
<Configuration of Power Supply System>
Fig. 1 is a block diagram for describing a schematic configuration of a power supply system 1 according to a first embodiment of the present invention.
As illustrated in Fig. 1, the power supply system 1 includes an onshore control device 2, an onshore power supply device 10, subsea cables 16-1 to 16-4, and subsea devices 20-1 to 20-3.
In the power supply system 1, the subsea cable 16-1, obtained by bundling a control cable 4 extending from the onshore control device 2 arranged on shore and a power line 12 extending from the onshore power supply device 10, is connected to one end of the subsea device 20-1. Further, the subsea devices 20-1 to 20-3 are connected to the subsea cables 16-1 to 16-4, respectively, in series such that each of the subsea devices 20-1 to 20-3 is interposed between the subsea cables, and finally, the subsea device 20-3 is connected to a sea ground 22-4 via the power line 12-4 accommodated in the subsea cable 16-4.
Embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
<Configuration of Power Supply System>
Fig. 1 is a block diagram for describing a schematic configuration of a power supply system 1 according to a first embodiment of the present invention.
As illustrated in Fig. 1, the power supply system 1 includes an onshore control device 2, an onshore power supply device 10, subsea cables 16-1 to 16-4, and subsea devices 20-1 to 20-3.
In the power supply system 1, the subsea cable 16-1, obtained by bundling a control cable 4 extending from the onshore control device 2 arranged on shore and a power line 12 extending from the onshore power supply device 10, is connected to one end of the subsea device 20-1. Further, the subsea devices 20-1 to 20-3 are connected to the subsea cables 16-1 to 16-4, respectively, in series such that each of the subsea devices 20-1 to 20-3 is interposed between the subsea cables, and finally, the subsea device 20-3 is connected to a sea ground 22-4 via the power line 12-4 accommodated in the subsea cable 16-4.
[0014]
Incidentally, the onshore power supply device 10 is electrically grounded to a ground 11 on a shore side and the power line 12-4 accommodated in the subsea cable 16-4 is grounded to the sea ground 22-4 in the subsea device 20-3 arranged on seafloor at the farthest end from the shore side in the power supply system 1, thereby forming a closed circuit for power supply as illustrated in Fig. 1.
In addition, the subsea devices 20-1 to 20-3 provided in the power supply system 1 are connected to functional sea grounds 22-1 to 22-3 via resistors, respectively, thereby serving a role of stabilizing a potential of a power supply line to an observation device (not illustrated) connected to the subsea devices 20-1 to 20-3, respectively.
Incidentally, the onshore power supply device 10 is electrically grounded to a ground 11 on a shore side and the power line 12-4 accommodated in the subsea cable 16-4 is grounded to the sea ground 22-4 in the subsea device 20-3 arranged on seafloor at the farthest end from the shore side in the power supply system 1, thereby forming a closed circuit for power supply as illustrated in Fig. 1.
In addition, the subsea devices 20-1 to 20-3 provided in the power supply system 1 are connected to functional sea grounds 22-1 to 22-3 via resistors, respectively, thereby serving a role of stabilizing a potential of a power supply line to an observation device (not illustrated) connected to the subsea devices 20-1 to 20-3, respectively.
[0015]
The onshore control device 2 forms the control means and outputs control data to each of the subsea devices via the control cable 4.
In addition, the onshore control device 2 includes a transmission unit 2a that transmits control data configured to perform various types of control, such as switching of a power supply line pass relay 62, to a transmission unit 40 provided in the subsea device 20.
The onshore power supply device 10 forms the power supply means, and is, for example, a DC power supply device which generates a DC constant current having a negative polarity.
In the present embodiment, the parent device is configured by including the onshore power supply device 10 (power supply means) and the onshore control device 2 (control means).
The subsea cable 16 includes the control cable 4 formed of optical fibers that transmit light of a plurality of different wavelengths and transfer the control data and the power line 12 which transfers power.
The subsea device 20 forms the child device, and is usually connected to the observation device such as a seismograph installed on the seafloor, and thus, called a junction box. The subsea device 20 distributes and supplies power, supplied from the onshore power supply device 10 or the other subsea devices 20 via the subsea cable 16, to the observation device, and transmits observation data observed by the observation device to the onshore control device 2 via the subsea cable 16.
Although the power supply system 1, for example, including the three subsea devices 20 on the seafloor has been described in the present embodiment, the number of the subsea devices 20 is not limited in the present invention.
The onshore control device 2 forms the control means and outputs control data to each of the subsea devices via the control cable 4.
In addition, the onshore control device 2 includes a transmission unit 2a that transmits control data configured to perform various types of control, such as switching of a power supply line pass relay 62, to a transmission unit 40 provided in the subsea device 20.
The onshore power supply device 10 forms the power supply means, and is, for example, a DC power supply device which generates a DC constant current having a negative polarity.
In the present embodiment, the parent device is configured by including the onshore power supply device 10 (power supply means) and the onshore control device 2 (control means).
The subsea cable 16 includes the control cable 4 formed of optical fibers that transmit light of a plurality of different wavelengths and transfer the control data and the power line 12 which transfers power.
The subsea device 20 forms the child device, and is usually connected to the observation device such as a seismograph installed on the seafloor, and thus, called a junction box. The subsea device 20 distributes and supplies power, supplied from the onshore power supply device 10 or the other subsea devices 20 via the subsea cable 16, to the observation device, and transmits observation data observed by the observation device to the onshore control device 2 via the subsea cable 16.
Although the power supply system 1, for example, including the three subsea devices 20 on the seafloor has been described in the present embodiment, the number of the subsea devices 20 is not limited in the present invention.
[0016]
<Configuration of Subsea device>
Fig. 2 is a block diagram for describing a configuration of the subsea device 20 provided in the power supply system 1 according to the first embodiment of the =
present invention.
The subsea device 20-1 illustrated in Fig. 1 is connected between the subsea cable 16-1 and the subsea cable 16-2, and the other subsea devices 20-2 and 20-3 are also connected so as to be interposed between two different subsea cables. Thus, the description will be given using the respective names and reference signs of the subsea device 20, the subsea cable 16, and the functional sea ground 22 for the sake of simplicity of description. Thus, it is assumed that the subsea cable 16 on the left side of the page is laid toward the shore side in Fig. 2.
The subsea device 20 illustrated in Fig. 2 includes the transmission unit 40, a drive power supply unit 50, a receiving unit 60, a control unit 70, and an output unit 80.
Main DC/DC converters 64 and 66 whose primary sides are connected in series are provided between the receiving unit 60 and the control unit 70.
The subsea device 20 includes underwater detachable connectors 30a and 30b for connection of the subsea cables 16 in a casing 20a. Inside the casing 20a, a power distribution line connected from the underwater detachable connector 30a to the receiving unit 60 is referred to as a power supply line 32a, a power line that supplies DC power to a primary winding provided in a transformer of the main DC/DC converter 64 is referred to as a power supply line 32b, a power line connected between the primary winding of the main DC/DC converter 64 and a primary winding of the main DC/DC converter 66 is referred to as a power supply line 32c, and a power line that supplies DC power to the primary winding of the main DC/DC converter 66 is referred to as a power supply line 32d, a power distribution line connected from the receiving unit 60 to the drive power supply unit 50 is referred to as a power supply line 32e, and a power distribution line connected from the drive power supply unit 50 to the underwater detachable connector 30b is referred to as a power supply line 32f.
<Configuration of Subsea device>
Fig. 2 is a block diagram for describing a configuration of the subsea device 20 provided in the power supply system 1 according to the first embodiment of the =
present invention.
The subsea device 20-1 illustrated in Fig. 1 is connected between the subsea cable 16-1 and the subsea cable 16-2, and the other subsea devices 20-2 and 20-3 are also connected so as to be interposed between two different subsea cables. Thus, the description will be given using the respective names and reference signs of the subsea device 20, the subsea cable 16, and the functional sea ground 22 for the sake of simplicity of description. Thus, it is assumed that the subsea cable 16 on the left side of the page is laid toward the shore side in Fig. 2.
The subsea device 20 illustrated in Fig. 2 includes the transmission unit 40, a drive power supply unit 50, a receiving unit 60, a control unit 70, and an output unit 80.
Main DC/DC converters 64 and 66 whose primary sides are connected in series are provided between the receiving unit 60 and the control unit 70.
The subsea device 20 includes underwater detachable connectors 30a and 30b for connection of the subsea cables 16 in a casing 20a. Inside the casing 20a, a power distribution line connected from the underwater detachable connector 30a to the receiving unit 60 is referred to as a power supply line 32a, a power line that supplies DC power to a primary winding provided in a transformer of the main DC/DC converter 64 is referred to as a power supply line 32b, a power line connected between the primary winding of the main DC/DC converter 64 and a primary winding of the main DC/DC converter 66 is referred to as a power supply line 32c, and a power line that supplies DC power to the primary winding of the main DC/DC converter 66 is referred to as a power supply line 32d, a power distribution line connected from the receiving unit 60 to the drive power supply unit 50 is referred to as a power supply line 32e, and a power distribution line connected from the drive power supply unit 50 to the underwater detachable connector 30b is referred to as a power supply line 32f.
[0017]
The transmission unit 40 receives the control data from the onshore control device 2 via the control cable 4 of the subsea cable 16.
The drive power supply unit 50 includes a DC/DC
converter 52 and switches a contact point state of the power supply line pass relay 62 based on the control data received by the transmission unit 40. The drive power supply unit 50 is provided with a low-voltage circuit, for example, a Zener diode ZD1 connected in series between the power supply lines 32e and 32f, generates drive power by operating the DC/DC converter 52, and switches a contact point of the power supply line pass relay 62 from a closed state to an open state by supplying power to a solenoid coil, provided in the power supply line pass relay 62 to be described later based on the control data received by the transmission unit 40, by using a Zener voltage generated between an anode and a cathode of the Zener diode ZD1.
The transmission unit 40 receives the control data from the onshore control device 2 via the control cable 4 of the subsea cable 16.
The drive power supply unit 50 includes a DC/DC
converter 52 and switches a contact point state of the power supply line pass relay 62 based on the control data received by the transmission unit 40. The drive power supply unit 50 is provided with a low-voltage circuit, for example, a Zener diode ZD1 connected in series between the power supply lines 32e and 32f, generates drive power by operating the DC/DC converter 52, and switches a contact point of the power supply line pass relay 62 from a closed state to an open state by supplying power to a solenoid coil, provided in the power supply line pass relay 62 to be described later based on the control data received by the transmission unit 40, by using a Zener voltage generated between an anode and a cathode of the Zener diode ZD1.
[0018]
The receiving unit 60 includes the power supply line pass relay 62 which is connected between the power supply lines 32a and 32e and passes between the power supply lines 32a and 32e.
The receiving unit 60 includes the primary winding of the transformer of the main DC/DC converter 64 and the primary winding of a transformer of the main DC/DC
converter 66.
The main DC/DC converter 64 includes a switch SW65 connected between the power supply lines 32b and 32c, the primary winding of the transformer connected between the power supply lines 32b and 32c, a switching element (not illustrated), a secondary winding opposing the primary winding, and a rectifying and smoothing circuit (not illustrated) connected to the subsequent stage of the secondary winding.
Further, the main DC/DC converter 66 includes a switch SW67 connected between the power supply lines 32c and 32d, a primary winding of a transformer connected between the power supply lines 32c and 32d, a switching element (not illustrated), and a secondary winding opposing the primary winding.
In addition, the switches SW65 and SW67 are so-called break relays, and are configured such that the contact point is turned into the open state when a current is cause to flow to the solenoid coil. It is possible to increase or decrease the power supply to the secondary sides of the main DC/DC converters 66 and 67 by switching the switches SW65 and 67 based on the control data received by the transmission unit 40.
The receiving unit 60 includes the power supply line pass relay 62 which is connected between the power supply lines 32a and 32e and passes between the power supply lines 32a and 32e.
The receiving unit 60 includes the primary winding of the transformer of the main DC/DC converter 64 and the primary winding of a transformer of the main DC/DC
converter 66.
The main DC/DC converter 64 includes a switch SW65 connected between the power supply lines 32b and 32c, the primary winding of the transformer connected between the power supply lines 32b and 32c, a switching element (not illustrated), a secondary winding opposing the primary winding, and a rectifying and smoothing circuit (not illustrated) connected to the subsequent stage of the secondary winding.
Further, the main DC/DC converter 66 includes a switch SW67 connected between the power supply lines 32c and 32d, a primary winding of a transformer connected between the power supply lines 32c and 32d, a switching element (not illustrated), and a secondary winding opposing the primary winding.
In addition, the switches SW65 and SW67 are so-called break relays, and are configured such that the contact point is turned into the open state when a current is cause to flow to the solenoid coil. It is possible to increase or decrease the power supply to the secondary sides of the main DC/DC converters 66 and 67 by switching the switches SW65 and 67 based on the control data received by the transmission unit 40.
[0019]
The main DC/DC converters 66 and 67 form a DC power conversion unit, and serve a role of converting first DC
power supplied to the primary side into second DC power and outputting the second DC power to the secondary side. The control unit 70 forms a power distribution unit and serves a role of distributing the second DC power to observation devices 100-1 to 100-4 (devices).
The control unit 70 includes a secondary winding opposing the primary winding of the transformer of the main DC/DC converter 64, a secondary winding opposing the primary winding of the transformer of the main DC/DC
converter 66, and primary windings of transformers of the output DC/DC converters 72-1 to 72-4.
The output DC/DC converters 72-1 to 72-4 include the primary windings of the transformers connected to the secondary sides of the main DC/DC converters 64 and 66, switching elements (not illustrated), secondary windings opposing the primary winding, and the rectifying and smoothing circuits (not illustrated) connected to the subsequent stages of the secondary windings.
The output DC/DC converters 72-1 to 72-4 can set each operation to an ON/OFF state based on the control data received by the transmission unit 40.
The main DC/DC converters 66 and 67 form a DC power conversion unit, and serve a role of converting first DC
power supplied to the primary side into second DC power and outputting the second DC power to the secondary side. The control unit 70 forms a power distribution unit and serves a role of distributing the second DC power to observation devices 100-1 to 100-4 (devices).
The control unit 70 includes a secondary winding opposing the primary winding of the transformer of the main DC/DC converter 64, a secondary winding opposing the primary winding of the transformer of the main DC/DC
converter 66, and primary windings of transformers of the output DC/DC converters 72-1 to 72-4.
The output DC/DC converters 72-1 to 72-4 include the primary windings of the transformers connected to the secondary sides of the main DC/DC converters 64 and 66, switching elements (not illustrated), secondary windings opposing the primary winding, and the rectifying and smoothing circuits (not illustrated) connected to the subsequent stages of the secondary windings.
The output DC/DC converters 72-1 to 72-4 can set each operation to an ON/OFF state based on the control data received by the transmission unit 40.
[0020]
Further, the control unit 70 includes output ports Fri and Pr2 to output surplus power out of the DC power supplied from the secondary sides of the main DC/DC
converters 64 and 66 to the dummy load device 90, and a functional ground terminal G.
It is possible to stabilize the potential of the power supply line to observation devices 100-1 to 100-4 by grounding the functional ground terminal G of the control unit 70, which is electrically insulated and held in a floating state, to the functional sea ground 22 via a resistor Rl.
The output unit 80 includes output ports P1 to P4 to output the DC power supplied from the secondary sides of the output DC/DC converters 72-1 to 72-4, respectively.
The observation devices 100-1 to 100-4 arranged at the seafloor are connected, respectively, to the output ports P1 to P4 as necessary, and power is consumed in each of the observation devices 100-1 to 100-4.
Incidentally, the transmission unit 40 and the control unit 70 are connected via a cable 42, and the control data is output from the transmission unit 40 to the control unit 70 via the cable 42 as illustrated in Fig. 2.
Further, the control unit 70 includes output ports Fri and Pr2 to output surplus power out of the DC power supplied from the secondary sides of the main DC/DC
converters 64 and 66 to the dummy load device 90, and a functional ground terminal G.
It is possible to stabilize the potential of the power supply line to observation devices 100-1 to 100-4 by grounding the functional ground terminal G of the control unit 70, which is electrically insulated and held in a floating state, to the functional sea ground 22 via a resistor Rl.
The output unit 80 includes output ports P1 to P4 to output the DC power supplied from the secondary sides of the output DC/DC converters 72-1 to 72-4, respectively.
The observation devices 100-1 to 100-4 arranged at the seafloor are connected, respectively, to the output ports P1 to P4 as necessary, and power is consumed in each of the observation devices 100-1 to 100-4.
Incidentally, the transmission unit 40 and the control unit 70 are connected via a cable 42, and the control data is output from the transmission unit 40 to the control unit 70 via the cable 42 as illustrated in Fig. 2.
[0021]
<Control Data>
Here, the control data transmitted from the onshore control device 2 to the subsea device 20 via the control cable 4 will be described.
For example, #001 to #003 may be used as the format of a device address unique to each of the subsea devices 20-1 to 20-3 illustrated in Fig. 1. In addition, each of control data DO to designate a power supply state of the device, control data D1 to designate the ON/OFF state of the switch SW65, control data D2 to designate the ON/OFF
state of the switch SW67, and control data D3 to D6 to designate the ON/OFF states of the operations of the output DC/DC converters 72-1 to 72-4 that output power to the observation devices 100-1 to 100-4, respectively, is designated.
Incidentally, it is assumed that "1" indicates the ON
state (closed state) and "0" indicates the OFF state (open state) in the control data DO to D2 regarding the state of the contact point of each relay. In addition, it is assumed that "1" indicates the ON state (operating state) and "0" indicates the OFF state (stopped state) in the control data D3 to D6 regarding an operating/stopped state of each output DC/DC converter.
<Control Data>
Here, the control data transmitted from the onshore control device 2 to the subsea device 20 via the control cable 4 will be described.
For example, #001 to #003 may be used as the format of a device address unique to each of the subsea devices 20-1 to 20-3 illustrated in Fig. 1. In addition, each of control data DO to designate a power supply state of the device, control data D1 to designate the ON/OFF state of the switch SW65, control data D2 to designate the ON/OFF
state of the switch SW67, and control data D3 to D6 to designate the ON/OFF states of the operations of the output DC/DC converters 72-1 to 72-4 that output power to the observation devices 100-1 to 100-4, respectively, is designated.
Incidentally, it is assumed that "1" indicates the ON
state (closed state) and "0" indicates the OFF state (open state) in the control data DO to D2 regarding the state of the contact point of each relay. In addition, it is assumed that "1" indicates the ON state (operating state) and "0" indicates the OFF state (stopped state) in the control data D3 to D6 regarding an operating/stopped state of each output DC/DC converter.
[0022]
[Table 1]
, Subsea Device Control data device address D 0 ID 1 D 2 D 3 ID 4 D 5 D 6 1 # 0 0 1 0 0 0 1 1 1 1 2 # 0 0 2 0 0 0 1 1 1 1 3 # 0 0 3 0 0 0 1 1 1 1
[Table 1]
, Subsea Device Control data device address D 0 ID 1 D 2 D 3 ID 4 D 5 D 6 1 # 0 0 1 0 0 0 1 1 1 1 2 # 0 0 2 0 0 0 1 1 1 1 3 # 0 0 3 0 0 0 1 1 1 1
[0023]
Incidentally, data examples illustrated in Table I
indicate that all the output DC/DC converters 72-1 to 72-4 of the subsea devices 20-1 to 20-3 are in the operating state.
Incidentally, data examples illustrated in Table I
indicate that all the output DC/DC converters 72-1 to 72-4 of the subsea devices 20-1 to 20-3 are in the operating state.
[0024]
Fig. 3 is a block diagram for describing a more detailed connection relationship between the main DC/DC
converters 64 and 66 and the output DC/DC converters 72-1 to 72-4 illustrated in Fig. 2 which are used in the power supply system 1 according to the first embodiment of the present invention.
Fig. 3 is a block diagram for describing a more detailed connection relationship between the main DC/DC
converters 64 and 66 and the output DC/DC converters 72-1 to 72-4 illustrated in Fig. 2 which are used in the power supply system 1 according to the first embodiment of the present invention.
[0025]
<Main DC/DC Converter>
The primary sides of the main DC/DC converters 64 and 66 are connected in series to the power supply lines 32b and 32d with the power supply line 32c interposed therebetween. On the other hand, the secondary sides of the main DC/DC converters 64 and 66 are connected in parallel to terminals 01 and 02.
The switch SW65 and a converter 64i are connected in parallel to the primary side of the main DC/DC converter 64, and the converter 641 is connected in parallel to a primary winding of a transformer 64t. The converter 64i converts a DC voltage input as the first DC power from the power supply lines 32b and 32c when the switch SW65 is in the open state by performing high-frequency switching using the switching element (not illustrated) into high-frequency power and outputs the converted power to the primary winding of the transformer 64t.
[CO26]
A rectifying and smoothing circuit 64c is connected in parallel to a secondary winding of the transformer 64t on the secondary side of the main DC/DC converter 64, and the rectifying and smoothing circuit 64c rectifies and smoothes the high-frequency power induced in the secondary winding of the transformer 64t using a diode and a capacitor to generate a DC voltage, and outputs the DC
voltage to the terminal 01 as the second DC power via a diode Dil.
The main DC/DC converter 66 has the same configuration as that of the main DC/DC converter 64, and a description thereof will be omitted.
The diodes Dil and Di2 provided in the main DC/DC
converters 64 and 66 are provided so as to prevent an output current from flowing from one main DC/DC converter to the other main DC/DC converter when the secondary sides are connected in parallel to the terminals 01 and 02. It is possible to connect the outputs of the main DC/DC
converters 64 and 66 to each other in parallel via the diodes Dil and Di2.
[0027]
As described above, the secondary sides of the main DC/DC converters 64 and 66 are connected in parallel to the terminals 01 and 02, the terminal 01 is connected to a terminal Ii and the terminal 02 is connected to a terminal 12 as illustrated in Fig. 3.
The primary sides of the output DC/DC converters 72-1 to 72-4 are connected in parallel to the terminals Ii and 12, and the secondary sides of the output DC/DC converters 72-1 to 72-4 are independently connected to the output ports P1 to P4, respectively. Incidentally, the observation devices 100-1 to 100-4 can be connected to the output ports 21 to P4 to be freely detachably as necessary.
In this manner, the secondary sides of the main DC/DC
converters 64 and 66 are connected in parallel to the terminals 01 and 02, the primary sides of the output DC/DC
converters 72-1 to 72-4 are connected in parallel to each other from the terminals 01 and 02 via the terminals Il and 12, and accordingly, it is possible to distribute the second DC power converted by the main DC/DC converters 64 and 66 to the output DC/DC converters 72-1 to 72-4.
Since the operation of the converter and the rectifying and smoothing circuit provided in each of the output DC/DC converters 72-1 to 72-4 are the same as the converter 64i and the converter 64c of the main DC/DC
converter 64, a description thereof will be omitted.
Incidentally, the terminals 02 and 12 are connected to the functional ground terminal G (Fig. 2) provided in the control unit 70, and is connected from the functional ground terminal G to the functional sea ground 22 via the resistor R1 as illustrated in Fig. 2.
[0028]
The dummy load device 90 illustrated in Fig. 3 is configured by connecting n dummy load units 92-1 to 92-n in series.
The dummy load device 90 can form a dummy load device corresponding to a load voltage of 400 V, for example, by connecting fifty dummy load units each of which has a load voltage of 8 V in series.
[0029]
Fig. 4 is a block diagram illustrating the dummy load unit as one unit of the dummy load device 90 used in the power supply system 1 according to the first embodiment of the present invention.
As illustrated in Fig. 4, a terminal A of a dummy load unit 92-k is connected to a terminal B of a dummy load unit 92-(k-1), and a terminal B of the dummy load unit 92-k is connected to a terminal A of a dummy load unit 92-(k+1).
The dummy load unit 92-k includes an inter-terminal voltage monitoring unit 94, a control voltage amplification unit 96, and a power consumption unit 98, and the respective units are connected in parallel between both the terminals A and B.
The inter-terminal voltage monitoring unit 94 is constituted by a semiconductor used for monitoring a voltage VAB applied between the terminals A and B
(hereinafter referred to as a semiconductor) and accompanying passive components thereof, monitors the voltage VAB between the terminals A and B, and adjusts the amount of a current flowing through the semiconductor such that the voltage VAB between the terminals A and B becomes constant without depending on a current Id flowing through the power consumption unit 98.
[0030]
The inter-terminal voltage monitoring unit 94 generates a control voltage Vs by the current flowing through the above-described semiconductor, and transmits the control voltage Vs to the control voltage amplification unit 96. The inter-terminal voltage monitoring unit 94 changes the amount of the current flowing through the semiconductor such that the voltage between the terminals A
and B becomes constant and adjusts a level of the control voltage Vs to be transmitted to the control voltage amplification unit 96.
The control voltage amplification unit 96 is constituted by a signal amplification semiconductor used for signal amplification and passive components accompanying this signal amplification, amplifies the control voltage Vs generated by the inter-terminal voltage monitoring unit 94 by g times (g > 1), and transmits a control voltage g x Vs to the power consumption unit 98.
The power consumption unit 98 is constituted by a power semiconductor and causes the power semiconductor to consume power by causing the required current Id to flow to the power semiconductor according to the control voltage g x Vs amplified by the control voltage amplification unit 96.
Incidentally, any one of a power transistor, a field effect transistor, and an insulated gate bipolar transistor (IGBT) may be used as the power semiconductor provided in the power consumption unit 98.
In addition, it is preferable to attach a heat sink, configured to dissipate heat generated by power consumption, to the power semiconductor.
[0031]
Next, an operation of the dummy load unit 92-k illustrated in Fig. 4 will be described.
The inter-terminal voltage monitoring unit 94 monitors the voltage VAB applied between the terminals A
and B, generates the control voltage Vs by the current flowing through the semiconductor, and transmits the generated control voltage Vs to the control voltage amplification unit 96, and further, changes the amount of the current flowing through the semiconductor such that the voltage VAB between the terminals A and B becomes constant, and adjusts the level of the control voltage Vs to be transmitted to the control voltage amplification unit 96.
The control voltage amplification unit 96 amplifies the control voltage Vs generated by the inter-terminal voltage monitoring unit 94 by g times and transmits the control voltage g x Vs to the power consumption unit 98.
The power consumption unit 98 causes the power semiconductor to consume power by causing the required current Id to flow to the power semiconductor according to the control voltage g x Vs amplified by the control voltage amplification unit 96.
[0032]
Fig. 5 is a graph regarding a voltage, time, and a current that represents an operation when the voltage VAB
applied between the terminals A and B is input to the dummy load unit 92-k which is one unit of the dummy load device 90 used in the power supply system 1 according to the first embodiment of the present invention while changing the voltage VAB.
The voltage on the vertical axis (left side) illustrated in Fig. 5 represents the voltage VAB input between the terminals A and B of the dummy load unit 92-k illustrated in Fig. 4, the current on the vertical axis (right side) illustrated in Fig. 5 represents the current Id flowing through the power semiconductor provided in the power consumption unit 98, and a potential at a point B (at a level of 0 V) illustrated in Fig. 4 is set as a relative reference.
<Main DC/DC Converter>
The primary sides of the main DC/DC converters 64 and 66 are connected in series to the power supply lines 32b and 32d with the power supply line 32c interposed therebetween. On the other hand, the secondary sides of the main DC/DC converters 64 and 66 are connected in parallel to terminals 01 and 02.
The switch SW65 and a converter 64i are connected in parallel to the primary side of the main DC/DC converter 64, and the converter 641 is connected in parallel to a primary winding of a transformer 64t. The converter 64i converts a DC voltage input as the first DC power from the power supply lines 32b and 32c when the switch SW65 is in the open state by performing high-frequency switching using the switching element (not illustrated) into high-frequency power and outputs the converted power to the primary winding of the transformer 64t.
[CO26]
A rectifying and smoothing circuit 64c is connected in parallel to a secondary winding of the transformer 64t on the secondary side of the main DC/DC converter 64, and the rectifying and smoothing circuit 64c rectifies and smoothes the high-frequency power induced in the secondary winding of the transformer 64t using a diode and a capacitor to generate a DC voltage, and outputs the DC
voltage to the terminal 01 as the second DC power via a diode Dil.
The main DC/DC converter 66 has the same configuration as that of the main DC/DC converter 64, and a description thereof will be omitted.
The diodes Dil and Di2 provided in the main DC/DC
converters 64 and 66 are provided so as to prevent an output current from flowing from one main DC/DC converter to the other main DC/DC converter when the secondary sides are connected in parallel to the terminals 01 and 02. It is possible to connect the outputs of the main DC/DC
converters 64 and 66 to each other in parallel via the diodes Dil and Di2.
[0027]
As described above, the secondary sides of the main DC/DC converters 64 and 66 are connected in parallel to the terminals 01 and 02, the terminal 01 is connected to a terminal Ii and the terminal 02 is connected to a terminal 12 as illustrated in Fig. 3.
The primary sides of the output DC/DC converters 72-1 to 72-4 are connected in parallel to the terminals Ii and 12, and the secondary sides of the output DC/DC converters 72-1 to 72-4 are independently connected to the output ports P1 to P4, respectively. Incidentally, the observation devices 100-1 to 100-4 can be connected to the output ports 21 to P4 to be freely detachably as necessary.
In this manner, the secondary sides of the main DC/DC
converters 64 and 66 are connected in parallel to the terminals 01 and 02, the primary sides of the output DC/DC
converters 72-1 to 72-4 are connected in parallel to each other from the terminals 01 and 02 via the terminals Il and 12, and accordingly, it is possible to distribute the second DC power converted by the main DC/DC converters 64 and 66 to the output DC/DC converters 72-1 to 72-4.
Since the operation of the converter and the rectifying and smoothing circuit provided in each of the output DC/DC converters 72-1 to 72-4 are the same as the converter 64i and the converter 64c of the main DC/DC
converter 64, a description thereof will be omitted.
Incidentally, the terminals 02 and 12 are connected to the functional ground terminal G (Fig. 2) provided in the control unit 70, and is connected from the functional ground terminal G to the functional sea ground 22 via the resistor R1 as illustrated in Fig. 2.
[0028]
The dummy load device 90 illustrated in Fig. 3 is configured by connecting n dummy load units 92-1 to 92-n in series.
The dummy load device 90 can form a dummy load device corresponding to a load voltage of 400 V, for example, by connecting fifty dummy load units each of which has a load voltage of 8 V in series.
[0029]
Fig. 4 is a block diagram illustrating the dummy load unit as one unit of the dummy load device 90 used in the power supply system 1 according to the first embodiment of the present invention.
As illustrated in Fig. 4, a terminal A of a dummy load unit 92-k is connected to a terminal B of a dummy load unit 92-(k-1), and a terminal B of the dummy load unit 92-k is connected to a terminal A of a dummy load unit 92-(k+1).
The dummy load unit 92-k includes an inter-terminal voltage monitoring unit 94, a control voltage amplification unit 96, and a power consumption unit 98, and the respective units are connected in parallel between both the terminals A and B.
The inter-terminal voltage monitoring unit 94 is constituted by a semiconductor used for monitoring a voltage VAB applied between the terminals A and B
(hereinafter referred to as a semiconductor) and accompanying passive components thereof, monitors the voltage VAB between the terminals A and B, and adjusts the amount of a current flowing through the semiconductor such that the voltage VAB between the terminals A and B becomes constant without depending on a current Id flowing through the power consumption unit 98.
[0030]
The inter-terminal voltage monitoring unit 94 generates a control voltage Vs by the current flowing through the above-described semiconductor, and transmits the control voltage Vs to the control voltage amplification unit 96. The inter-terminal voltage monitoring unit 94 changes the amount of the current flowing through the semiconductor such that the voltage between the terminals A
and B becomes constant and adjusts a level of the control voltage Vs to be transmitted to the control voltage amplification unit 96.
The control voltage amplification unit 96 is constituted by a signal amplification semiconductor used for signal amplification and passive components accompanying this signal amplification, amplifies the control voltage Vs generated by the inter-terminal voltage monitoring unit 94 by g times (g > 1), and transmits a control voltage g x Vs to the power consumption unit 98.
The power consumption unit 98 is constituted by a power semiconductor and causes the power semiconductor to consume power by causing the required current Id to flow to the power semiconductor according to the control voltage g x Vs amplified by the control voltage amplification unit 96.
Incidentally, any one of a power transistor, a field effect transistor, and an insulated gate bipolar transistor (IGBT) may be used as the power semiconductor provided in the power consumption unit 98.
In addition, it is preferable to attach a heat sink, configured to dissipate heat generated by power consumption, to the power semiconductor.
[0031]
Next, an operation of the dummy load unit 92-k illustrated in Fig. 4 will be described.
The inter-terminal voltage monitoring unit 94 monitors the voltage VAB applied between the terminals A
and B, generates the control voltage Vs by the current flowing through the semiconductor, and transmits the generated control voltage Vs to the control voltage amplification unit 96, and further, changes the amount of the current flowing through the semiconductor such that the voltage VAB between the terminals A and B becomes constant, and adjusts the level of the control voltage Vs to be transmitted to the control voltage amplification unit 96.
The control voltage amplification unit 96 amplifies the control voltage Vs generated by the inter-terminal voltage monitoring unit 94 by g times and transmits the control voltage g x Vs to the power consumption unit 98.
The power consumption unit 98 causes the power semiconductor to consume power by causing the required current Id to flow to the power semiconductor according to the control voltage g x Vs amplified by the control voltage amplification unit 96.
[0032]
Fig. 5 is a graph regarding a voltage, time, and a current that represents an operation when the voltage VAB
applied between the terminals A and B is input to the dummy load unit 92-k which is one unit of the dummy load device 90 used in the power supply system 1 according to the first embodiment of the present invention while changing the voltage VAB.
The voltage on the vertical axis (left side) illustrated in Fig. 5 represents the voltage VAB input between the terminals A and B of the dummy load unit 92-k illustrated in Fig. 4, the current on the vertical axis (right side) illustrated in Fig. 5 represents the current Id flowing through the power semiconductor provided in the power consumption unit 98, and a potential at a point B (at a level of 0 V) illustrated in Fig. 4 is set as a relative reference.
26 A current waveform of the current Id flowing through the power semiconductor provided in the power consumption unit 98 represents 0.0 A in a range from time tl to t2 and in a range where a voltage waveform of the voltage VA13 applied between the terminals A and B gradually rises from 0 V to 7.7 V (< g X Vs).
At this time, the power semiconductor is turned off when the control voltage g X Vs for controlling the power semiconductor is less than 7.7 V, and thus, the current Id remains at 0.0 A.
Next, the current waveform of the current Id flowing through the power semiconductor provided in the power consumption unit 98 steeply rises up to about 0.0 A to 3.4 A in a range from time t2 to t3 and in a range where the voltage waveform of the voltage VAB applied between the terminals A and B rises to 7.7 V g X Vs) or higher, but the voltage waveform of the voltage VAB applied between the terminals A and B is substantially constant at 7.7 V (> g x Vs).
At this time, the power semiconductor is turned on since the control voltage g X Vs for controlling the power semiconductor is 7.7 V or higher, and accordingly, the current Id steeply rises up to about 0.0 A to 3.4 A
according to the control voltage g x Vs.
Incidentally, the above-described control voltage g x Vs may be appropriately designed according to a type of the power semiconductor.
At this time, the power semiconductor is turned off when the control voltage g X Vs for controlling the power semiconductor is less than 7.7 V, and thus, the current Id remains at 0.0 A.
Next, the current waveform of the current Id flowing through the power semiconductor provided in the power consumption unit 98 steeply rises up to about 0.0 A to 3.4 A in a range from time t2 to t3 and in a range where the voltage waveform of the voltage VAB applied between the terminals A and B rises to 7.7 V g X Vs) or higher, but the voltage waveform of the voltage VAB applied between the terminals A and B is substantially constant at 7.7 V (> g x Vs).
At this time, the power semiconductor is turned on since the control voltage g X Vs for controlling the power semiconductor is 7.7 V or higher, and accordingly, the current Id steeply rises up to about 0.0 A to 3.4 A
according to the control voltage g x Vs.
Incidentally, the above-described control voltage g x Vs may be appropriately designed according to a type of the power semiconductor.
27 [0033]
Fig. 6 is a graph regarding a voltage, time, and a current that represents an operation when a load change is applied to the dummy load unit 92-k as one unit of the dummy load device 90 used in the power supply system 1 according to the first embodiment of the present invention.
The voltage on the vertical axis (left side) illustrated in Fig. 6 represents the voltage VA B input between the terminals A and B of the dummy load unit 92-k illustrated in Fig. 4, the current on the vertical axis (right side) illustrated in Fig. 6 represents the current Id flowing through the power semiconductor provided in the power consumption unit 98, and a potential at a point B (at a level of 0 V) illustrated in Fig. 4 is set as a relative reference.
In the load change test, a pulsating current having an offset voltage of 7.7 V or higher and having a frequency of about 4 Hz is applied as the voltage VAB between the terminals A and B.
At this time, the power semiconductor is always in the on-state since the control voltage g x Vs for controlling the power semiconductor is 7.7 V or higher, and accordingly, the current waveform of the current Id flowing through the power semiconductor varies between about 2.55 A
and 3.375 A around 3.0 A according to the control voltage g X vs. At this time, the voltage waveform of the voltage VAB
applied between the terminals A and B falls within a range
Fig. 6 is a graph regarding a voltage, time, and a current that represents an operation when a load change is applied to the dummy load unit 92-k as one unit of the dummy load device 90 used in the power supply system 1 according to the first embodiment of the present invention.
The voltage on the vertical axis (left side) illustrated in Fig. 6 represents the voltage VA B input between the terminals A and B of the dummy load unit 92-k illustrated in Fig. 4, the current on the vertical axis (right side) illustrated in Fig. 6 represents the current Id flowing through the power semiconductor provided in the power consumption unit 98, and a potential at a point B (at a level of 0 V) illustrated in Fig. 4 is set as a relative reference.
In the load change test, a pulsating current having an offset voltage of 7.7 V or higher and having a frequency of about 4 Hz is applied as the voltage VAB between the terminals A and B.
At this time, the power semiconductor is always in the on-state since the control voltage g x Vs for controlling the power semiconductor is 7.7 V or higher, and accordingly, the current waveform of the current Id flowing through the power semiconductor varies between about 2.55 A
and 3.375 A around 3.0 A according to the control voltage g X vs. At this time, the voltage waveform of the voltage VAB
applied between the terminals A and B falls within a range
28 of 7.70 V to 7.71 V.
[0034]
<Operation of Power Supply System>
Next, a description will be given regarding a start-up operation of each device provided in the power supply system 1 according to the first embodiment of the present invention with reference to Figs. 7(a) to 7(f) and Figs.
8(a) to 8(g). Figs. 7(a) to 7(g) and Figs. 8(a) to 8(g) are sequence diagrams for describing the start-up operation of each device provided in the power supply system 1 according to the first embodiment of the present invention.
[0035]
<Activating Operation of Subsea device>
When activating the power supply system 1 illustrated in Fig. 1, power is supplied to the onshore power supply device 10 arranged on the shore side, and a constant current is supplied from the onshore power supply device 10 to the subsea devices 20-1 to 20-3 via the subsea cable 16-1.
When the onshore power supply device 10 is activated, the current supplied from the onshore power supply device 10 rises to 0.0 A to 3.0 A from time tO to ti, and then, a constant current of 3.0 A is supplied to the onshore power supply device 10 as illustrated in Fig. 7(a).
For example, the constant current is supplied sequentially to the subsea cable 16, the power supply line 32a, the power supply line pass relay 62, the power supply
[0034]
<Operation of Power Supply System>
Next, a description will be given regarding a start-up operation of each device provided in the power supply system 1 according to the first embodiment of the present invention with reference to Figs. 7(a) to 7(f) and Figs.
8(a) to 8(g). Figs. 7(a) to 7(g) and Figs. 8(a) to 8(g) are sequence diagrams for describing the start-up operation of each device provided in the power supply system 1 according to the first embodiment of the present invention.
[0035]
<Activating Operation of Subsea device>
When activating the power supply system 1 illustrated in Fig. 1, power is supplied to the onshore power supply device 10 arranged on the shore side, and a constant current is supplied from the onshore power supply device 10 to the subsea devices 20-1 to 20-3 via the subsea cable 16-1.
When the onshore power supply device 10 is activated, the current supplied from the onshore power supply device 10 rises to 0.0 A to 3.0 A from time tO to ti, and then, a constant current of 3.0 A is supplied to the onshore power supply device 10 as illustrated in Fig. 7(a).
For example, the constant current is supplied sequentially to the subsea cable 16, the power supply line 32a, the power supply line pass relay 62, the power supply
29 line 32e, the drive power supply unit 50, the power supply line 32f, and the subsea cable 16 in the subsea device 20 illustrated in Fig. 2.
Hereinafter, an operation of the subsea device 20 will be described.
As described above, the DC/DC converter 52 of about W to 30 W is provided in the drive power supply unit 50, and this DC/DC converter 52 is activated when the constant current is supplied at time tO. As illustrated in Fig.
10 7(b), a supply voltage of, for example, 16 V is applied to the transmission unit 40 at time tO. Further, a current of 0.0 A to 3.0 A is supplied from the DC/DC converter 52 to the transmission unit 40 according to a circuit load from time tO to ti as illustrated in Fig. 7(c).
15 [0036]
The onshore control device 2 transmits the device address and the control data (DO = 0, D1 = 0, and D2 = 0) for controlling the power supply line pass relay 62 and the switches SW 65 and 67 provided in each of the subsea devices 20-1 to 20-3 from the closed state to the open state to the subsea devices 20-1 to 20-3 from the transmission unit 2a via the subsea cable 16-1 at time t2 illustrated in Fig. 7(d).
The transmission units 40 of the subsea devices 20-1 to 20-3 that have received the device address and control data from the onshore control device 2 via the subsea cable 16-1 output the control data DO to the receiving unit 60 when the received device address coincides with the device address of the relevant device.
The receiving unit 60 generates a pass relay ON
signal based on the control data DO = 0 input from the transmission unit 40, and supplies power to the solenoid coil provided in the power supply line pass relay 62 at time t2 illustrated in Fig. 7(d). Accordingly, the contact point of the power supply line pass relay 62 provided in the receiving unit 60 is switched from the closed state to the open state at time t2 illustrated in Fig. 7(e).
[0037]
Fig. 7(f) illustrates that the amount of a current flowing through the main DC/DC converters 64 and 66, the output DC/DC converters 72-1 to 72-4, and the dummy load device 90 connected to the receiving unit 60 and the control unit 70 is 3.0 A and that this current amount is equal to the amount (3.0 A) of power supplied from the onshore power supply device 10.
Specifically, the current flowing between the contact points of the power supply line pass relay 62 in the closed state from time tO to t2 is illustrated.
The amount of a current, which flows through the main DC/DC converters 64 and 66 as contact points of the switches SW 65 and SW 67 of the main DC/DC converters 64 and 66 in the non-operating state are switched from the closed state to the open state and power is supplied to the main DC/DC converters 64 and 66 from the power = , supply lines 32b and 32d and the main DC/DC converters 64 and 66 are switched to the activated state, is illustrated from time t2 to t3.
The amount of a current, which flows through the main DC/DC converters 64 and 66 as an input voltage rises to about 80% of input rating in the main DC/DC converters 64 and 66 so that a current resonance circuit starts to be activated and the switching element is switched to the high frequency, is illustrated from time t3 to t4.
The amount of a current flowing through the dummy load device 90 and the observation device in the middle of operating is illustrated at time t4 and the subsequent time.
[0038]
<Activation of Main DC/DC Converter>
The supply of power to the primary winding of the transformer of the main DC/DC converters 64 and 66 connected in series between the power supply lines 32b and 32d and the switching element (not illustrated) is started from time t2 to t4 illustrated in Fig. 8(a) when the contact point of the power supply line pass relay 62 is switched from the closed state to the open state in the receiving unit 60 in Fig. 2.
At the same time, the switch SW65 is switched from the closed state to the open state based on the control data D1 = 0 input from the transmission unit 40 in the main DC/DC converter 64 in Fig. 3.
Accordingly, the main DC/DC converter 64 is activated.
Further, when the input voltage rises to 400 V which is about 80% of the input rating at time t3 in the main DC/DC
converter 64, the current resonance circuit provided in the converter 64i starts to be activated, and the switching element is switched to the high frequency. Accordingly, magnetic energy generated in the primary winding induces the voltage in the secondary winding, a DC voltage is generated by the rectifying and smoothing circuit 64c connected to the subsequent stage of the secondary winding, and the DC voltage is output to the output DC/DC converters 72-1 to 72-4 from time t3 to t5 illustrated in Fig. 8(a).
In addition, the main DC/DC converter 66 is also activated in the same manner as the activation of the main DC/DC converter 64.
As a result, an output voltage of 400 V is output between the output ports Prl and Pr2 at time t5 illustrated in Fig. 8(b).
[0(339]
<Operation of Dummy Load Device>
At time t5 illustrated in Fig. 8(c), when the activation of the main DC/DC converters 64 and 66 is completed, the output voltage of 400 V is output between the output ports Fri and Pr2 of the control unit 70, the voltage of 400 V is applied between both terminals of the dummy load device 90, and a current of 3.40 A flows.
Specifically, since the fifty dummy load units are connected in series to the dummy load device 90, for example, the voltage VAB applied between both the terminals A and B of one dummy load unit is 8 V (= 400 V/50).
Here, an operation using each dummy load unit provided in the dummy load device 90 will be described with reference to Fig. 4.
The inter-terminal voltage monitoring unit 94 monitors the voltage VAB applied between the terminals A
and B, generates the control voltage Vs by the current flowing through the semiconductor, and transmits the generated control voltage Vs to the control voltage amplification unit 96 in the dummy load unit, and further, changes the amount of the current flowing through the semiconductor such that the voltage VAB between the terminals A and B becomes constant, and adjusts the level of the control voltage Vs to be transmitted to the control voltage amplification unit 96.
The control voltage amplification unit 96 amplifies the control voltage Vs generated by the inter-terminal voltage monitoring unit 94 by g times and generates and transmits the control voltage g x Vs to the power consumption unit 98.
The power consumption unit 98 causes the power semiconductor to consume power by causing the required current Id to flow to the power semiconductor according to the control voltage g X Vs amplified by the control voltage amplification unit 96.
[0040]
As a result, it is possible to consume the surplus power that is no longer consumed in the observation device switched from the power supply state to the non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
Further, it is possible to adjust the amount of the current flowing through the semiconductor such that the voltage VAB applied between both the terminals A and B is constant without depending on the current Id flowing through the power semiconductor provided in the power consumption unit 98, and it is possible to consume the surplus power that is no longer consumed in the observation device switched from the power supply state to the non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
[0041]
<Activation of Output DC/DC Converter 72-1>
Next, a description will be given regarding an operation of activating only the output DC/DC converter 72-1 to supply power only to the observation device 100-1 in the subsea device 20-1.
For example, the control data of the subsea device 20-1 may be changed such that D3 = 1, D4 - 0, D5 = 0, and DO = 0 as shown in Table 2.
[0042]
[Table 2]
Subsea Device Control data device address DO D1 E)2 E)3 E)4 E)5 ID6 1 o o 1 1 1 1 1 [0043]
First, the onshore control device 2 illustrated in Fig. 1 transmits a device address (#001) unique to the subsea device 20-1 and the control data to the subsea device 20-1 via the subsea cable 16-1 in order to control the subsea device 20-1 at time t6 illustrated in Figs. 8(d).
Next, when the received device address (#001) coincides with the device address (#001) of the relevant device, the transmission unit 40 of the subsea device 20 illustrated in Fig. 2 outputs the control data to the control unit 70. The control unit 70 illustrated in Fig. 3 switches the output DC/DC converters 72-1 from the stopped state to the operating state based on the control data D3 =
1, D4 = 0, D5 = 0, and D6 = 0 input from the transmission unit 40.
[0044]
Specifically, in Fig. 3, the converter is switched from the stopped state to the activated state based on the control data D3 = 1 input from the transmission unit 40 in the output DC/DC converters 72-1 from time t6 to t7 illustrated in Fig. 8 (d). Accordingly, the output DC/DC
converter 72-1 is activated.
That is, as the switching element provided in the converter is subjected to ON/OFF control in the output DC/DC converter 72-1, magnetic energy generated in the primary winding induces a voltage in the secondary winding, and a DC voltage is generated by the rectifying and smoothing circuit connected to the subsequent stage of the secondary winding.
The output DC/DC converter 72-1 is activated so that the DC voltage is output from the output port P1 to the observation device 100-1, the output voltage of the output port P1 gradually rises from 0 V to 300 V at time t6 to t7, and the current flowing through the dummy load device 90 drops to 3.4 A to 2.55 A at time t7.
[0045]
That is, when the DC voltage output from the output DC/DC converter 72-1 to the observation device 100-1 via the output port P1 reaches 300 V and the power consumed by the observation device 100-1 reaches a specified value at time t7, the voltage across both ends of the input-side terminals Ii and 12 of the output DC/Dc converter 72-1 drops (only by a minute level). Accordingly, the current flowing through the dummy load device 90 drops from 3.4 A
to 2.55 A.
At this time, the DC power is supplied from the output DC/DC converter 72-1 to the output port P1, the power is supplied from the output port P1 to the observation device 100-1 arranged on the seafloor, and observation is started in the observation device 100-1.
[0046]
<Activation of Output DC/DC Converter 72-2>
Next, a description will be given regarding an operation of activating the output DC/DC converter 72-2 to supply power to the observation device 100-2 in the subsea device 20-1.
For example, the control data of the subsea device 20-1 shown in Table 2 may be changed such that D3 = 1, D4 =
1, D5 = 0, and D6 = 0.
Incidentally, operations of the onshore control device 2 illustrated in Fig. 1, the transmission unit 40 of the subsea device 20 illustrated in Fig. 2, the control unit 70 illustrated in Fig. 3, and the output DC/DC
converter 72-2 from time t8 to t9 illustrated in Fig. 8(e) are substantially the same as the description regarding the "activation of the output DC/DC converter 72-1", and thus, a description thereof will be omitted.
When the DC voltage output from the output DC/DC
converter 72-2 to the observation device 100-2 via the output port P2 reaches 300 V and the power consumed by the observation device 100-2 reaches a specified value at time t9, the voltage across both ends of the input-side terminals I1 and 12 of the output DC/DC converter 72-2 drops (only by a minute level). Accordingly, the current flowing through the dummy load device 90 drops from 2.55 A
to 1.70 A.
[0047]
<Activation of Output DC/DC Converter 72-3>
Next, a description will be given regarding an operation of activating the output DC/DC converter 72-3 to supply power to the observation device 100-3 in the subsea device 20-1.
For example, the control data of the subsea device 20-1 shown in Table 2 may be changed such that D3 = 1, D4 --1, D5 = 1, and D6 = 0.
Incidentally, operations of the onshore control device 2 illustrated in Fig. 1, the transmission unit 40 of the subsea device 20 illustrated in Fig. 2, the control unit 70 illustrated in Fig. 3, and the output DC/DC
converter 72-3 from time t10 to tll illustrated in Fig.
8(f) are substantially the same as the description regarding the "activation of the output DC/DC converter 72-2", and thus, a description thereof will be omitted.
When the DC voltage output from the output DC/DC
converter 72-3 to the observation device 100-3 via the output port P3 reaches 300 V and the power consumed by the observation device 100-3 reaches a specified value at time t11, the voltage across both ends of the input-side terminals Ii and 12 of the output DC/DC converter 72-3 drops (only by a minute level). Accordingly, the current flowing through the dummy load device 90 drops from 1.70 A
to 0.85 A.
[0048]
<Activation of Output DC/DC Converter 72-4>
Next, a description will be given regarding an operation of activating the output DC/DC converter 72-4 to supply power to the observation device 100-4 in the subsea device 20-1.
For example, the control data of the subsea device 20-1 shown in Table 2 may be changed such that D3 = 1, D4 =
1, D5 = 1, and D6 = 1.
Incidentally, operations of the onshore control device 2 illustrated in Fig. 1, the transmission unit 40 of the subsea device 20 illustrated in Fig. 2, the control unit 70 illustrated in Fig. 3, and the output DC/DC
converter 72-4 from time t12 to t13 illustrated in Fig.
8(g) are substantially the same as the description regarding the "activation of the output DC/DC converter 72-2", and thus, a description thereof will be omitted.
When the DC voltage output from the output DC/DC
converter 72-4 to the observation device 100-4 via the output port P4 reaches 300 V and the power consumed by the observation device 100-4 reaches a specified value at time t13, the voltage across both ends of the input-side terminals Ii and 12 of the output DC/DC converter 72-4 drops (only by a minute level). Accordingly, the current flowing through the dummy load device 90 drops from 0.85 A
to 0.00 A.
[0049]
As a result, it is possible to consume the surplus power that is no longer consumed in the observation device, switched from the power supply state to the non-power supply state, by the dummy load device, and it is possible to provide the power supply system capable of consuming the surplus power that is no longer consumed with the simple configuration.
In addition, it is possible to cover the power to be consumed in the observation device, switched from the non-power supply state to the power supply state, with the power that is being consumed in the dummy load device, and it is possible to provide the power supply system capable of easily performing exchange of the surplus power between the observation device and the dummy load device with the simple configuration.
[0050]
<Second Embodiment>
Fig. 9 is a block diagram illustrating a dummy load unit as one unit of a dummy load device 90 used in a power supply system 1 according to a second embodiment of the present invention.
As illustrated in Fig. 9, a terminal A of a dummy load unit 92-k is connected to a terminal B of a dummy load unit 92-(k-1), and a terminal B of the dummy load unit 92-k is connected to a terminal A of a dummy load unit 92-(k+1).
As illustrated in Fig. 9, the dummy load unit 92-k includes an inter-terminal voltage monitoring unit 104, a control voltage generation unit 106, and a power consumption unit 108, and the respective units are connected in parallel between the terminals A and B.
The inter-terminal voltage monitoring unit 104 is constituted by a semiconductor used for monitoring a voltage VAB applied between the terminals A and B, a voltage control semiconductor used for voltage control, and accompanying passive components of the voltage control semiconductor, monitors the voltage VAB between the terminals A and B, generates a monitoring voltage Vw to make the voltage VAE between the terminals A and B constant without depending on a current Id flowing through the power consumption unit 108, and transmits the monitoring voltage Vw to the control voltage generation unit 106.
The control voltage generation unit 106 is constituted by a signal amplification semiconductor used for signal amplification and passive components accompanying the signal amplification semiconductor, amplifies the monitoring voltage Vw generated by the inter-terminal voltage monitoring unit 104 by g times, generates a required control voltage g x Vw, and transmits the control voltage g x Vw to the power consumption unit 108.
The power consumption unit 108 is constituted by a power semiconductor and causes the power semiconductor to consume power by causing a required current to flow to the power semiconductor according to the control voltage g x Vw generated by the control voltage generation unit 106.
Incidentally, any one of a power transistor, a field effect transistor, and an IGBT may be used as the power semiconductor provided in the power consumption unit 108.
[0051]
Next, an operation of the dummy load unit 92-k illustrated in Fig. 9 will be described.
The inter-terminal voltage monitoring unit 104 monitors the voltage VAB between the terminals A and B, generates the monitoring voltage Vw to make the voltage VAS
between the terminals A and B constant without depending on the current Id flowing through the power consumption unit 108, and transmits the monitoring voltage Vw to the control voltage generation unit 106.
The control voltage generation unit 106 amplifies the monitoring voltage Vw received from the inter-terminal voltage monitoring unit 104 by g times, generates the required control voltage g X Vw, and supplies the control voltage g x Vw to the power consumption unit 108.
The power consumption unit 108 is constituted by the power semiconductor and causes the power semiconductor to consume power by causing the required current to flow to the power semiconductor according to the control voltage g X Vw generated by the control voltage generation unit 106.
In this manner, the dummy load device 90 is configured by connecting, for example, fifty dummy load units each of which has the voltage VAB applied between both terminals A and B of 8 V in series.
[0052]
As a result, it is possible to consume the surplus power that is no longer consumed in an observation device switched from a power supply state to a non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
Further, it is possible to adjust the amount of the current flowing through the semiconductor such that the voltage VAB applied between both the terminals A and B is constant without depending on the current Id flowing through the power semiconductor provided in the power consumption unit 108, and it is possible to consume the surplus power that is no longer consumed in the observation device switched from the power supply state to the non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
[0053]
<Third Embodiment>
Fig. 10 is a block diagram illustrating a dummy load unit as one unit of a dummy load device 90 used in a power supply system 1 according to a third embodiment of the present invention.
As illustrated in Fig. 10, a terminal A of a dummy load unit 92-k is connected to a terminal B of a dummy load unit 92-(k-1), and a terminal B of the dummy load unit 92-k is connected to a terminal A of a dummy load unit 92-(k+1).
The dummy load unit 92-k includes a control unit 114, an amplification unit 116, and a power consumption unit 118, and the respective units are connected in parallel between the terminals A and B.
The control unit 114 is constituted by a voltage control semiconductor used for voltage control and accompanying passive components thereof, monitors a voltage VAB applied between the terminals A and B, generates a control voltage Vs to make the voltage VAB between the terminals A and B constant without depending on a current flowing through the power consumption unit 118, and transmits the control voltage Vs to the amplification unit 116.
The amplification unit 116 is constituted by a signal amplification semiconductor used for signal amplification and passive components accompanying the signal amplification, amplifies the control voltage generated by the control unit 114 by g times, generates a control voltage g x Vs, and transmits the control voltage g x Vs to the power consumption unit 118.
The power consumption unit 118 is constituted by a power semiconductor and causes the power semiconductor to consume power by causing a current to flow to the power semiconductor according to the control voltage g x Vs generated by the amplification unit 116. Incidentally, any one of a power transistor, a field effect transistor, and an IGBT may be used as the power semiconductor provided in the power consumption unit 118.
[0054]
Next, an operation of the dummy load unit 92-k illustrated in Fig. 10 will be described.
The control unit 114 monitors the voltage VAB applied between the terminals A and B and transmits the control voltage Vs to the amplification unit 116 such that the voltage VAB between the terminals A and=B is constant without depending on the current flowing through the power consumption unit 118.
The amplification unit 116 amplifies the control voltage received from the control unit 114 by g times and transmits the control voltage g X VS to the power consumption unit 118.
The power consumption unit 118 causes the power semiconductor to consume the power by causing the current to flow to the power semiconductor according to the control voltage g x Vs received from the amplification unit 116.
In this manner, the dummy load device 90 is configured by connecting, for example, fifty dummy load units each of which has the voltage VAB applied between both terminals A and B of 8V in series.
[0055]
As a result, it is possible to consume the surplus power that is no longer consumed in the observation device switched from the power supply state to the non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
Further, it is possible to adjust the amount of the current flowing through the semiconductor such that the voltage VAB applied between both the terminals A and B is constant without depending on the current Id flowing through the power semiconductor provided in the power consumption unit 118, and it is possible to consume the surplus power that is no longer consumed in the observation device switched from the power supply state to the non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
[0056]
<Fourth Embodiment>
Fig. 11 is a block diagram for describing a configuration of a subsea device 20 provided in a power supply system 1 according to a fourth embodiment of the present invention. Incidentally, the same reference signs as those illustrated in Fig. 2 among reference signs illustrated in Fig. 11 have the same configurations as those in Fig. 2, and a description thereof will be omitted.
The subsea device 20 according to the fourth embodiment is different from the first embodiment in which the dummy load device 90 is connected to the control portion 70 in that a dummy load device 90 is connected to a receiving unit 60.
Specifically, the dummy load device 90 is connected to both contact points of a power supply line pass relay 62 via output ports Prl and Pr2.
[0057]
Fig. 12 is a block diagram for describing a more detailed connection relationship between main DC/DC
converters 64 and 66 and output DC/DC converters 72-1 to 72-4 illustrated in Fig. 11 which are used in the power supply system 1 according to the fourth embodiment of the present invention.
Specifically, the dummy load device 90 is connected to power supply lines 32b and 32d and is connected to each primary side of the main DC/DC converters 64 and 66. The dummy load device 90 can consume surplus power that has not been consumed in observation devices 100-1 to 100-4, which can be connected to the respective ports P1 to P4 of an output unit 80, when the contact point of the power supply line pass relay 62, and a contact point the switch SW65 and/or the switch SW67 are switched from a closed state to an open state according to the control by an onshore control device 4.
[0058]
As a result, it is possible to consume the surplus power that is no longer consumed in the observation device, switched from the power supply state to the non-power supply state, by the dummy load device, and it is possible to provide the power supply system capable of consuming the surplus power that is no longer consumed with the simple configuration.
In addition, it is possible to cover the power to be consumed in the observation device, switched from the non-power supply state to the power supply state, with the CA 02994098 201.8-01-29 =
power that is being consumed in the dummy load device, and it is possible to provide the power supply system capable of easily performing exchange of the surplus power between the observation device and the dummy load device with the simple configuration.
[0059]
<Effect of Invention>
In the dummy load unit of the present invention, the inter-terminal voltage monitoring unit, the control voltage amplification unit, and the power consumption unit are constituted by semiconductor elements and accompanying passive elements thereof, and it is possible to accurately design and manufacture (adjust) each block.
Accordingly, it is possible to implement the dummy load unit having small characteristic variation at relatively low cost, and thus, it is possible to obtain the characteristics as expected even in the case of multi-stage connection. In this regard, it is superior in terms of characteristics to the configuration in which the Zener diodes are connected in multiple stages used in the related art.
In addition, there is an advantage that it is remarkably superior in terms of voltage stability to the configuration in which the Zener diode is simply caused to consume the surplus power as in the related art since the dummy load unit of the present invention is constituted by the inter-terminal voltage monitoring unit, the control voltage amplification unit, and the power consumption unit.
[0060]
<Configuration, Action, and Effect of Exemplary Embodiment of Present Invention>
<First Aspect>
A power supply system 1 of this aspect is a power supply system 1 including: a parent device which has an onshore power supply device 10 (power supply means) and an onshore control device 2 (control means); and a subsea device 20 (child device) which is connected to the parent device via a subsea cable 16, and is characterized in that the subsea device 20 (child device) includes: main DC/DC
converters 64 and 66 (DC power conversion unit) that convert first DC power supplied to a primary side into second DC power and output the second DC power to a secondary side; and a control unit 70 (power distribution unit) and an output unit 80 which distribute the second DC
power to a dummy load device 90 and at least one of observation devices 100 (devices), and the dummy load device 90 is connected to the primary side or the secondary side of the main DC/DC converters 64 and 66 and consumes surplus power out of the first DC power or the second DC
power in accordance with an increase or a decrease of the number of the observation devices 100 connected to the control unit 70 and the output unit 80.
According to this aspect, the main DC/DC converters 64 and 66 convert the first DC power supplied to the primary side into the second DC power and output the second DC power to the secondary side, the control unit 70 and the output unit 80 distribute the second DC power to the dummy load device 90 and at least one of the observation devices 100 (devices), the dummy load device 90 is connected to the primary side or the secondary side of the main DC/DC
converters 64 and 66 and consumes the surplus power out of the first DC power or the second DC power in accordance with the increase or decrease of the number of the observation devices 100 connected to the control unit 70 and the output unit 80 in the subsea device 20 (child device).
As a result, it is possible to consume the surplus power that is no longer consumed in the observation device, switched from the power supply state to the non-power supply state, by the dummy load device, and it is possible to provide the power supply system capable of consuming the surplus power that is no longer consumed with the simple configuration.
In addition, it is possible to cover the power to be consumed in the observation device, switched from the non-power supply state to the power supply state, with the power that is being consumed in the dummy load device, and it is possible to provide the power supply system capable of easily performing exchange of the surplus power between the observation device and the dummy load device with the simple configuration.
[0061]
<Second Aspect>
A dummy load device 90 of this aspect includes a plurality of dummy load units 92 connected in series, and each of the dummy load units 92 is characterized by including: an inter-terminal voltage monitoring unit 94 which monitors a voltage VAB applied between both terminals A and B of the dummy load unit 92 to generate a control voltage Vs and adjusts a level of the control voltage Vs such that the voltage VAB applied between both the terminals A and B is constant; a control voltage amplification unit 96 which amplifies the control voltage Vs generated by the inter-terminal voltage monitoring unit 94 by g times to generate a control voltage g x Vs; and a power consumption unit 98 which causes a power semiconductor to consume power by causing a required current Id to flow to the power semiconductor according to the control voltage g x Vs generated by the control voltage amplification unit 96.
According to this aspect, the inter-terminal voltage monitoring unit 94 monitors the voltage VAB applied between both the terminals A and B of the dummy load unit 92 to generate the control voltage Vs and adjusts the level of the control voltage Vs such that the voltage VAB applied between both the terminals A and B is constant, the control voltage amplification unit 96 amplifies the control voltage Vs generated by the inter-terminal voltage monitoring unit 94 by g times to generate the control voltage g X Vs, and the power consumption unit 98 causes the power semiconductor to consume power by causing the required current Id to flow to the power semiconductor according to the control voltage g X Vs generated by the control voltage amplification unit 96 in each of the dummy load units 92.
As a result, it is possible to consume the surplus power that is no longer consumed in an observation device switched from a power supply state to a non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
In addition, it is possible to cover the power to be consumed in the observation device, switched from the non-power supply state to the power supply state, with the power that is being consumed in the dummy load device, and it is possible to easily perform the exchange of the surplus power between the observation device and the dummy load device with the simple configuration.
[0062]
<Third Aspect>
An inter-terminal voltage monitoring unit 94 of this aspect is characterized by having a semiconductor for monitoring a voltage VAB applied between both terminals A
and B and generating a control voltage Vs by adjusting the amount of a current flowing through the semiconductor such that the voltage VAE applied between both the terminals A
and B is constant without depending on a current Id flowing through a power semiconductor provided in a power consumption unit 98.
According to this aspect, the inter-terminal voltage monitoring unit 94 has the semiconductor for monitoring the voltage VAB applied between both the terminals A and B and generates the control voltage Vs by adjusting the amount of the current flowing through the semiconductor such that the voltage VAB applied between both the terminals A and B is constant without depending on the current Id flowing through the power semiconductor provided in the power consumption unit 98.
Accordingly, it is possible to adjust the amount of the current flowing through the semiconductor such that the voltage VAB applied between both the terminals A and B is constant without depending on the current Id flowing through the power semiconductor provided in the power consumption unit 98, and it is possible to consume surplus power that is no longer consumed in an observation device switched from a power supply state to a non-power supply state by a dummy load device 90 in which a plurality of dummy load units 92 is connected in series.
[0063]
<Fourth Aspect>
A power semiconductor of this aspect is characterized by being any one of a transistor, a field effect transistor, and an IGBT.
According to this aspect, it is possible to consume power applied between two terminals by the power semiconductor since the power semiconductor is any one of the transistor, the field effect transistor, and the IGBT.
As a result, it is possible to consume surplus power that is no longer consumed in an observation device, switched from a power supply state to a non-power supply state, by a dummy load device.
[0064]
<Fifth Aspect>
A dummy load device 90 of this aspect is characterized in that a current flowing through the dummy load device 90 decreases when the number of observation devices 100 (devices) connected to a control unit 70 (power distribution unit) increases, and the current flowing through the dummy load device 90 increases when the number of the observation devices 100 (devices) connected to the control unit 70 decreases.
According to this aspect, the current flowing through the dummy load device 90 decreases when the number of the observation devices 100 connected to the control unit 70 increases, and the current flowing through the dummy load device 90 increases when the number of observation devices 100 connected to the control unit 70 decreases in the dummy load device 90.
As a result, the dummy load device 90 can consume surplus power in accordance with an increase or a decrease of the number of observation devices 100.
As a result, when the number of the observation devices 100 connected to the control unit 70 decreases, it is possible to consume the surplus power that is no longer consumed in the observation device 100, switched from a power supply state to a non-power supply state, by the dummy load device, and it is possible to provide a power supply system capable of consuming the surplus power that is no longer consumed with a simple configuration.
In addition, when the number of the observation devices 100 connected to the control unit 70 increases, it is possible to cover the power to be consumed in the observation device 100, switched from the non-power supply state to the power supply state, with the power that is being consumed in the dummy load device, and it is possible to provide the power supply system capable of easily performing exchange of the surplus power between the observation device and the dummy load device with the simple configuration.
[0065]
<Sixth Aspect>
A dummy load device 90 of this aspect is a dummy load device including a plurality of dummy load units 92 connected in series, and each of the dummy load units 92 is characterized by including: an inter-terminal voltage monitoring unit 94 which monitors a voltage VAB applied between both terminals A and B of the dummy load unit 92 to generate a control voltage Vs and adjusts a level of the control voltage Vs such that the voltage \TAB applied between both the terminals A and B is constant; a control voltage amplification unit 96 which amplifies the control voltage Vs generated by the inter-terminal voltage monitoring unit 94 by g times to generate a control voltage g x Vs; and a power consumption unit 98 which causes a power semiconductor to consume power by causing a required current Id to flow to the power semiconductor according to the control voltage g x Vs generated by the control voltage amplification unit 96.
According to this aspect, the inter-terminal voltage monitoring unit 94 monitors the voltage VAB applied between both the terminals A and B of the dummy load unit 92 to generate the control voltage Vs and adjusts the level of the control voltage Vs such that the voltage VAB applied between both the terminals A and B is constant, the control voltage amplification unit 96 amplifies the control voltage Vs generated by the inter-terminal voltage monitoring unit 94 by g times to generate the control voltage g x Vs, and the power consumption unit 98 causes the power semiconductor to consume power by causing the required current Id to flow to the power semiconductor according to the control voltage g x Vs generated by the control voltage amplification unit 96 in each of the dummy load units 92.
As a result, it is possible to consume the surplus power that is no longer consumed in an observation device switched from a power supply state to a non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
In addition, it is possible to cover the power to be consumed in the observation device, switched from the non-power supply state to the power supply state, with the power that is being consumed in the dummy load device, and it is possible to easily perform the exchange of the surplus power between the observation device and the dummy load device with the simple configuration.
[0066]
As above, the present invention has been described with reference to the example in which the parent device on the shore and the child device on the seafloor are connected via the subsea cable. However, the present invention is not limited to this example, but can be applied to all scenes where power is supplied to a child device installed in a remote place that is secluded, for example, when power is supplied to an eruption monitoring device installed near a crater of a volcano, when power is supplied to a dam level monitoring device, and the like.
In addition, the present invention can be also applied to a system which relates to power supply on shore and supplies power in a DC system to each house or a room of each house.
Description of the reference numerals [0067]
1.. .Power supply system, 2.. .Onshore control device (Control means), 4. ..Control cable, 10. ..Onshore power supply device (Power supply means), 11. ..Ground, 12...Power line, 16. ..Subsea cable, 20.. .Subsea device (Child device), 22.. .Functional sea ground, 40.. .Transmission unit, 42.. .Cable, 62.. .Power supply line pass relay, 64,66.. .Main DC/DC converter, 65,67.. .Switch SW, 50.. .Drive power supply unit, 60.. .Receiving unit, 70.. .Control unit, 72.. .Output DC/DC converter, 80.. .Output unit, 90.. .Dummy load device, 92.. .Dummy load unit, 94,104.. .Inter-terminal voltage monitoring unit, 96.. .Control voltage amplification unit, 98,108,118.. .Power consumption unit, 100.. .Observation device, 106...Control voltage generation unit, 114.. .Control unit, 116.. .Amplification unit
Hereinafter, an operation of the subsea device 20 will be described.
As described above, the DC/DC converter 52 of about W to 30 W is provided in the drive power supply unit 50, and this DC/DC converter 52 is activated when the constant current is supplied at time tO. As illustrated in Fig.
10 7(b), a supply voltage of, for example, 16 V is applied to the transmission unit 40 at time tO. Further, a current of 0.0 A to 3.0 A is supplied from the DC/DC converter 52 to the transmission unit 40 according to a circuit load from time tO to ti as illustrated in Fig. 7(c).
15 [0036]
The onshore control device 2 transmits the device address and the control data (DO = 0, D1 = 0, and D2 = 0) for controlling the power supply line pass relay 62 and the switches SW 65 and 67 provided in each of the subsea devices 20-1 to 20-3 from the closed state to the open state to the subsea devices 20-1 to 20-3 from the transmission unit 2a via the subsea cable 16-1 at time t2 illustrated in Fig. 7(d).
The transmission units 40 of the subsea devices 20-1 to 20-3 that have received the device address and control data from the onshore control device 2 via the subsea cable 16-1 output the control data DO to the receiving unit 60 when the received device address coincides with the device address of the relevant device.
The receiving unit 60 generates a pass relay ON
signal based on the control data DO = 0 input from the transmission unit 40, and supplies power to the solenoid coil provided in the power supply line pass relay 62 at time t2 illustrated in Fig. 7(d). Accordingly, the contact point of the power supply line pass relay 62 provided in the receiving unit 60 is switched from the closed state to the open state at time t2 illustrated in Fig. 7(e).
[0037]
Fig. 7(f) illustrates that the amount of a current flowing through the main DC/DC converters 64 and 66, the output DC/DC converters 72-1 to 72-4, and the dummy load device 90 connected to the receiving unit 60 and the control unit 70 is 3.0 A and that this current amount is equal to the amount (3.0 A) of power supplied from the onshore power supply device 10.
Specifically, the current flowing between the contact points of the power supply line pass relay 62 in the closed state from time tO to t2 is illustrated.
The amount of a current, which flows through the main DC/DC converters 64 and 66 as contact points of the switches SW 65 and SW 67 of the main DC/DC converters 64 and 66 in the non-operating state are switched from the closed state to the open state and power is supplied to the main DC/DC converters 64 and 66 from the power = , supply lines 32b and 32d and the main DC/DC converters 64 and 66 are switched to the activated state, is illustrated from time t2 to t3.
The amount of a current, which flows through the main DC/DC converters 64 and 66 as an input voltage rises to about 80% of input rating in the main DC/DC converters 64 and 66 so that a current resonance circuit starts to be activated and the switching element is switched to the high frequency, is illustrated from time t3 to t4.
The amount of a current flowing through the dummy load device 90 and the observation device in the middle of operating is illustrated at time t4 and the subsequent time.
[0038]
<Activation of Main DC/DC Converter>
The supply of power to the primary winding of the transformer of the main DC/DC converters 64 and 66 connected in series between the power supply lines 32b and 32d and the switching element (not illustrated) is started from time t2 to t4 illustrated in Fig. 8(a) when the contact point of the power supply line pass relay 62 is switched from the closed state to the open state in the receiving unit 60 in Fig. 2.
At the same time, the switch SW65 is switched from the closed state to the open state based on the control data D1 = 0 input from the transmission unit 40 in the main DC/DC converter 64 in Fig. 3.
Accordingly, the main DC/DC converter 64 is activated.
Further, when the input voltage rises to 400 V which is about 80% of the input rating at time t3 in the main DC/DC
converter 64, the current resonance circuit provided in the converter 64i starts to be activated, and the switching element is switched to the high frequency. Accordingly, magnetic energy generated in the primary winding induces the voltage in the secondary winding, a DC voltage is generated by the rectifying and smoothing circuit 64c connected to the subsequent stage of the secondary winding, and the DC voltage is output to the output DC/DC converters 72-1 to 72-4 from time t3 to t5 illustrated in Fig. 8(a).
In addition, the main DC/DC converter 66 is also activated in the same manner as the activation of the main DC/DC converter 64.
As a result, an output voltage of 400 V is output between the output ports Prl and Pr2 at time t5 illustrated in Fig. 8(b).
[0(339]
<Operation of Dummy Load Device>
At time t5 illustrated in Fig. 8(c), when the activation of the main DC/DC converters 64 and 66 is completed, the output voltage of 400 V is output between the output ports Fri and Pr2 of the control unit 70, the voltage of 400 V is applied between both terminals of the dummy load device 90, and a current of 3.40 A flows.
Specifically, since the fifty dummy load units are connected in series to the dummy load device 90, for example, the voltage VAB applied between both the terminals A and B of one dummy load unit is 8 V (= 400 V/50).
Here, an operation using each dummy load unit provided in the dummy load device 90 will be described with reference to Fig. 4.
The inter-terminal voltage monitoring unit 94 monitors the voltage VAB applied between the terminals A
and B, generates the control voltage Vs by the current flowing through the semiconductor, and transmits the generated control voltage Vs to the control voltage amplification unit 96 in the dummy load unit, and further, changes the amount of the current flowing through the semiconductor such that the voltage VAB between the terminals A and B becomes constant, and adjusts the level of the control voltage Vs to be transmitted to the control voltage amplification unit 96.
The control voltage amplification unit 96 amplifies the control voltage Vs generated by the inter-terminal voltage monitoring unit 94 by g times and generates and transmits the control voltage g x Vs to the power consumption unit 98.
The power consumption unit 98 causes the power semiconductor to consume power by causing the required current Id to flow to the power semiconductor according to the control voltage g X Vs amplified by the control voltage amplification unit 96.
[0040]
As a result, it is possible to consume the surplus power that is no longer consumed in the observation device switched from the power supply state to the non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
Further, it is possible to adjust the amount of the current flowing through the semiconductor such that the voltage VAB applied between both the terminals A and B is constant without depending on the current Id flowing through the power semiconductor provided in the power consumption unit 98, and it is possible to consume the surplus power that is no longer consumed in the observation device switched from the power supply state to the non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
[0041]
<Activation of Output DC/DC Converter 72-1>
Next, a description will be given regarding an operation of activating only the output DC/DC converter 72-1 to supply power only to the observation device 100-1 in the subsea device 20-1.
For example, the control data of the subsea device 20-1 may be changed such that D3 = 1, D4 - 0, D5 = 0, and DO = 0 as shown in Table 2.
[0042]
[Table 2]
Subsea Device Control data device address DO D1 E)2 E)3 E)4 E)5 ID6 1 o o 1 1 1 1 1 [0043]
First, the onshore control device 2 illustrated in Fig. 1 transmits a device address (#001) unique to the subsea device 20-1 and the control data to the subsea device 20-1 via the subsea cable 16-1 in order to control the subsea device 20-1 at time t6 illustrated in Figs. 8(d).
Next, when the received device address (#001) coincides with the device address (#001) of the relevant device, the transmission unit 40 of the subsea device 20 illustrated in Fig. 2 outputs the control data to the control unit 70. The control unit 70 illustrated in Fig. 3 switches the output DC/DC converters 72-1 from the stopped state to the operating state based on the control data D3 =
1, D4 = 0, D5 = 0, and D6 = 0 input from the transmission unit 40.
[0044]
Specifically, in Fig. 3, the converter is switched from the stopped state to the activated state based on the control data D3 = 1 input from the transmission unit 40 in the output DC/DC converters 72-1 from time t6 to t7 illustrated in Fig. 8 (d). Accordingly, the output DC/DC
converter 72-1 is activated.
That is, as the switching element provided in the converter is subjected to ON/OFF control in the output DC/DC converter 72-1, magnetic energy generated in the primary winding induces a voltage in the secondary winding, and a DC voltage is generated by the rectifying and smoothing circuit connected to the subsequent stage of the secondary winding.
The output DC/DC converter 72-1 is activated so that the DC voltage is output from the output port P1 to the observation device 100-1, the output voltage of the output port P1 gradually rises from 0 V to 300 V at time t6 to t7, and the current flowing through the dummy load device 90 drops to 3.4 A to 2.55 A at time t7.
[0045]
That is, when the DC voltage output from the output DC/DC converter 72-1 to the observation device 100-1 via the output port P1 reaches 300 V and the power consumed by the observation device 100-1 reaches a specified value at time t7, the voltage across both ends of the input-side terminals Ii and 12 of the output DC/Dc converter 72-1 drops (only by a minute level). Accordingly, the current flowing through the dummy load device 90 drops from 3.4 A
to 2.55 A.
At this time, the DC power is supplied from the output DC/DC converter 72-1 to the output port P1, the power is supplied from the output port P1 to the observation device 100-1 arranged on the seafloor, and observation is started in the observation device 100-1.
[0046]
<Activation of Output DC/DC Converter 72-2>
Next, a description will be given regarding an operation of activating the output DC/DC converter 72-2 to supply power to the observation device 100-2 in the subsea device 20-1.
For example, the control data of the subsea device 20-1 shown in Table 2 may be changed such that D3 = 1, D4 =
1, D5 = 0, and D6 = 0.
Incidentally, operations of the onshore control device 2 illustrated in Fig. 1, the transmission unit 40 of the subsea device 20 illustrated in Fig. 2, the control unit 70 illustrated in Fig. 3, and the output DC/DC
converter 72-2 from time t8 to t9 illustrated in Fig. 8(e) are substantially the same as the description regarding the "activation of the output DC/DC converter 72-1", and thus, a description thereof will be omitted.
When the DC voltage output from the output DC/DC
converter 72-2 to the observation device 100-2 via the output port P2 reaches 300 V and the power consumed by the observation device 100-2 reaches a specified value at time t9, the voltage across both ends of the input-side terminals I1 and 12 of the output DC/DC converter 72-2 drops (only by a minute level). Accordingly, the current flowing through the dummy load device 90 drops from 2.55 A
to 1.70 A.
[0047]
<Activation of Output DC/DC Converter 72-3>
Next, a description will be given regarding an operation of activating the output DC/DC converter 72-3 to supply power to the observation device 100-3 in the subsea device 20-1.
For example, the control data of the subsea device 20-1 shown in Table 2 may be changed such that D3 = 1, D4 --1, D5 = 1, and D6 = 0.
Incidentally, operations of the onshore control device 2 illustrated in Fig. 1, the transmission unit 40 of the subsea device 20 illustrated in Fig. 2, the control unit 70 illustrated in Fig. 3, and the output DC/DC
converter 72-3 from time t10 to tll illustrated in Fig.
8(f) are substantially the same as the description regarding the "activation of the output DC/DC converter 72-2", and thus, a description thereof will be omitted.
When the DC voltage output from the output DC/DC
converter 72-3 to the observation device 100-3 via the output port P3 reaches 300 V and the power consumed by the observation device 100-3 reaches a specified value at time t11, the voltage across both ends of the input-side terminals Ii and 12 of the output DC/DC converter 72-3 drops (only by a minute level). Accordingly, the current flowing through the dummy load device 90 drops from 1.70 A
to 0.85 A.
[0048]
<Activation of Output DC/DC Converter 72-4>
Next, a description will be given regarding an operation of activating the output DC/DC converter 72-4 to supply power to the observation device 100-4 in the subsea device 20-1.
For example, the control data of the subsea device 20-1 shown in Table 2 may be changed such that D3 = 1, D4 =
1, D5 = 1, and D6 = 1.
Incidentally, operations of the onshore control device 2 illustrated in Fig. 1, the transmission unit 40 of the subsea device 20 illustrated in Fig. 2, the control unit 70 illustrated in Fig. 3, and the output DC/DC
converter 72-4 from time t12 to t13 illustrated in Fig.
8(g) are substantially the same as the description regarding the "activation of the output DC/DC converter 72-2", and thus, a description thereof will be omitted.
When the DC voltage output from the output DC/DC
converter 72-4 to the observation device 100-4 via the output port P4 reaches 300 V and the power consumed by the observation device 100-4 reaches a specified value at time t13, the voltage across both ends of the input-side terminals Ii and 12 of the output DC/DC converter 72-4 drops (only by a minute level). Accordingly, the current flowing through the dummy load device 90 drops from 0.85 A
to 0.00 A.
[0049]
As a result, it is possible to consume the surplus power that is no longer consumed in the observation device, switched from the power supply state to the non-power supply state, by the dummy load device, and it is possible to provide the power supply system capable of consuming the surplus power that is no longer consumed with the simple configuration.
In addition, it is possible to cover the power to be consumed in the observation device, switched from the non-power supply state to the power supply state, with the power that is being consumed in the dummy load device, and it is possible to provide the power supply system capable of easily performing exchange of the surplus power between the observation device and the dummy load device with the simple configuration.
[0050]
<Second Embodiment>
Fig. 9 is a block diagram illustrating a dummy load unit as one unit of a dummy load device 90 used in a power supply system 1 according to a second embodiment of the present invention.
As illustrated in Fig. 9, a terminal A of a dummy load unit 92-k is connected to a terminal B of a dummy load unit 92-(k-1), and a terminal B of the dummy load unit 92-k is connected to a terminal A of a dummy load unit 92-(k+1).
As illustrated in Fig. 9, the dummy load unit 92-k includes an inter-terminal voltage monitoring unit 104, a control voltage generation unit 106, and a power consumption unit 108, and the respective units are connected in parallel between the terminals A and B.
The inter-terminal voltage monitoring unit 104 is constituted by a semiconductor used for monitoring a voltage VAB applied between the terminals A and B, a voltage control semiconductor used for voltage control, and accompanying passive components of the voltage control semiconductor, monitors the voltage VAB between the terminals A and B, generates a monitoring voltage Vw to make the voltage VAE between the terminals A and B constant without depending on a current Id flowing through the power consumption unit 108, and transmits the monitoring voltage Vw to the control voltage generation unit 106.
The control voltage generation unit 106 is constituted by a signal amplification semiconductor used for signal amplification and passive components accompanying the signal amplification semiconductor, amplifies the monitoring voltage Vw generated by the inter-terminal voltage monitoring unit 104 by g times, generates a required control voltage g x Vw, and transmits the control voltage g x Vw to the power consumption unit 108.
The power consumption unit 108 is constituted by a power semiconductor and causes the power semiconductor to consume power by causing a required current to flow to the power semiconductor according to the control voltage g x Vw generated by the control voltage generation unit 106.
Incidentally, any one of a power transistor, a field effect transistor, and an IGBT may be used as the power semiconductor provided in the power consumption unit 108.
[0051]
Next, an operation of the dummy load unit 92-k illustrated in Fig. 9 will be described.
The inter-terminal voltage monitoring unit 104 monitors the voltage VAB between the terminals A and B, generates the monitoring voltage Vw to make the voltage VAS
between the terminals A and B constant without depending on the current Id flowing through the power consumption unit 108, and transmits the monitoring voltage Vw to the control voltage generation unit 106.
The control voltage generation unit 106 amplifies the monitoring voltage Vw received from the inter-terminal voltage monitoring unit 104 by g times, generates the required control voltage g X Vw, and supplies the control voltage g x Vw to the power consumption unit 108.
The power consumption unit 108 is constituted by the power semiconductor and causes the power semiconductor to consume power by causing the required current to flow to the power semiconductor according to the control voltage g X Vw generated by the control voltage generation unit 106.
In this manner, the dummy load device 90 is configured by connecting, for example, fifty dummy load units each of which has the voltage VAB applied between both terminals A and B of 8 V in series.
[0052]
As a result, it is possible to consume the surplus power that is no longer consumed in an observation device switched from a power supply state to a non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
Further, it is possible to adjust the amount of the current flowing through the semiconductor such that the voltage VAB applied between both the terminals A and B is constant without depending on the current Id flowing through the power semiconductor provided in the power consumption unit 108, and it is possible to consume the surplus power that is no longer consumed in the observation device switched from the power supply state to the non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
[0053]
<Third Embodiment>
Fig. 10 is a block diagram illustrating a dummy load unit as one unit of a dummy load device 90 used in a power supply system 1 according to a third embodiment of the present invention.
As illustrated in Fig. 10, a terminal A of a dummy load unit 92-k is connected to a terminal B of a dummy load unit 92-(k-1), and a terminal B of the dummy load unit 92-k is connected to a terminal A of a dummy load unit 92-(k+1).
The dummy load unit 92-k includes a control unit 114, an amplification unit 116, and a power consumption unit 118, and the respective units are connected in parallel between the terminals A and B.
The control unit 114 is constituted by a voltage control semiconductor used for voltage control and accompanying passive components thereof, monitors a voltage VAB applied between the terminals A and B, generates a control voltage Vs to make the voltage VAB between the terminals A and B constant without depending on a current flowing through the power consumption unit 118, and transmits the control voltage Vs to the amplification unit 116.
The amplification unit 116 is constituted by a signal amplification semiconductor used for signal amplification and passive components accompanying the signal amplification, amplifies the control voltage generated by the control unit 114 by g times, generates a control voltage g x Vs, and transmits the control voltage g x Vs to the power consumption unit 118.
The power consumption unit 118 is constituted by a power semiconductor and causes the power semiconductor to consume power by causing a current to flow to the power semiconductor according to the control voltage g x Vs generated by the amplification unit 116. Incidentally, any one of a power transistor, a field effect transistor, and an IGBT may be used as the power semiconductor provided in the power consumption unit 118.
[0054]
Next, an operation of the dummy load unit 92-k illustrated in Fig. 10 will be described.
The control unit 114 monitors the voltage VAB applied between the terminals A and B and transmits the control voltage Vs to the amplification unit 116 such that the voltage VAB between the terminals A and=B is constant without depending on the current flowing through the power consumption unit 118.
The amplification unit 116 amplifies the control voltage received from the control unit 114 by g times and transmits the control voltage g X VS to the power consumption unit 118.
The power consumption unit 118 causes the power semiconductor to consume the power by causing the current to flow to the power semiconductor according to the control voltage g x Vs received from the amplification unit 116.
In this manner, the dummy load device 90 is configured by connecting, for example, fifty dummy load units each of which has the voltage VAB applied between both terminals A and B of 8V in series.
[0055]
As a result, it is possible to consume the surplus power that is no longer consumed in the observation device switched from the power supply state to the non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
Further, it is possible to adjust the amount of the current flowing through the semiconductor such that the voltage VAB applied between both the terminals A and B is constant without depending on the current Id flowing through the power semiconductor provided in the power consumption unit 118, and it is possible to consume the surplus power that is no longer consumed in the observation device switched from the power supply state to the non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
[0056]
<Fourth Embodiment>
Fig. 11 is a block diagram for describing a configuration of a subsea device 20 provided in a power supply system 1 according to a fourth embodiment of the present invention. Incidentally, the same reference signs as those illustrated in Fig. 2 among reference signs illustrated in Fig. 11 have the same configurations as those in Fig. 2, and a description thereof will be omitted.
The subsea device 20 according to the fourth embodiment is different from the first embodiment in which the dummy load device 90 is connected to the control portion 70 in that a dummy load device 90 is connected to a receiving unit 60.
Specifically, the dummy load device 90 is connected to both contact points of a power supply line pass relay 62 via output ports Prl and Pr2.
[0057]
Fig. 12 is a block diagram for describing a more detailed connection relationship between main DC/DC
converters 64 and 66 and output DC/DC converters 72-1 to 72-4 illustrated in Fig. 11 which are used in the power supply system 1 according to the fourth embodiment of the present invention.
Specifically, the dummy load device 90 is connected to power supply lines 32b and 32d and is connected to each primary side of the main DC/DC converters 64 and 66. The dummy load device 90 can consume surplus power that has not been consumed in observation devices 100-1 to 100-4, which can be connected to the respective ports P1 to P4 of an output unit 80, when the contact point of the power supply line pass relay 62, and a contact point the switch SW65 and/or the switch SW67 are switched from a closed state to an open state according to the control by an onshore control device 4.
[0058]
As a result, it is possible to consume the surplus power that is no longer consumed in the observation device, switched from the power supply state to the non-power supply state, by the dummy load device, and it is possible to provide the power supply system capable of consuming the surplus power that is no longer consumed with the simple configuration.
In addition, it is possible to cover the power to be consumed in the observation device, switched from the non-power supply state to the power supply state, with the CA 02994098 201.8-01-29 =
power that is being consumed in the dummy load device, and it is possible to provide the power supply system capable of easily performing exchange of the surplus power between the observation device and the dummy load device with the simple configuration.
[0059]
<Effect of Invention>
In the dummy load unit of the present invention, the inter-terminal voltage monitoring unit, the control voltage amplification unit, and the power consumption unit are constituted by semiconductor elements and accompanying passive elements thereof, and it is possible to accurately design and manufacture (adjust) each block.
Accordingly, it is possible to implement the dummy load unit having small characteristic variation at relatively low cost, and thus, it is possible to obtain the characteristics as expected even in the case of multi-stage connection. In this regard, it is superior in terms of characteristics to the configuration in which the Zener diodes are connected in multiple stages used in the related art.
In addition, there is an advantage that it is remarkably superior in terms of voltage stability to the configuration in which the Zener diode is simply caused to consume the surplus power as in the related art since the dummy load unit of the present invention is constituted by the inter-terminal voltage monitoring unit, the control voltage amplification unit, and the power consumption unit.
[0060]
<Configuration, Action, and Effect of Exemplary Embodiment of Present Invention>
<First Aspect>
A power supply system 1 of this aspect is a power supply system 1 including: a parent device which has an onshore power supply device 10 (power supply means) and an onshore control device 2 (control means); and a subsea device 20 (child device) which is connected to the parent device via a subsea cable 16, and is characterized in that the subsea device 20 (child device) includes: main DC/DC
converters 64 and 66 (DC power conversion unit) that convert first DC power supplied to a primary side into second DC power and output the second DC power to a secondary side; and a control unit 70 (power distribution unit) and an output unit 80 which distribute the second DC
power to a dummy load device 90 and at least one of observation devices 100 (devices), and the dummy load device 90 is connected to the primary side or the secondary side of the main DC/DC converters 64 and 66 and consumes surplus power out of the first DC power or the second DC
power in accordance with an increase or a decrease of the number of the observation devices 100 connected to the control unit 70 and the output unit 80.
According to this aspect, the main DC/DC converters 64 and 66 convert the first DC power supplied to the primary side into the second DC power and output the second DC power to the secondary side, the control unit 70 and the output unit 80 distribute the second DC power to the dummy load device 90 and at least one of the observation devices 100 (devices), the dummy load device 90 is connected to the primary side or the secondary side of the main DC/DC
converters 64 and 66 and consumes the surplus power out of the first DC power or the second DC power in accordance with the increase or decrease of the number of the observation devices 100 connected to the control unit 70 and the output unit 80 in the subsea device 20 (child device).
As a result, it is possible to consume the surplus power that is no longer consumed in the observation device, switched from the power supply state to the non-power supply state, by the dummy load device, and it is possible to provide the power supply system capable of consuming the surplus power that is no longer consumed with the simple configuration.
In addition, it is possible to cover the power to be consumed in the observation device, switched from the non-power supply state to the power supply state, with the power that is being consumed in the dummy load device, and it is possible to provide the power supply system capable of easily performing exchange of the surplus power between the observation device and the dummy load device with the simple configuration.
[0061]
<Second Aspect>
A dummy load device 90 of this aspect includes a plurality of dummy load units 92 connected in series, and each of the dummy load units 92 is characterized by including: an inter-terminal voltage monitoring unit 94 which monitors a voltage VAB applied between both terminals A and B of the dummy load unit 92 to generate a control voltage Vs and adjusts a level of the control voltage Vs such that the voltage VAB applied between both the terminals A and B is constant; a control voltage amplification unit 96 which amplifies the control voltage Vs generated by the inter-terminal voltage monitoring unit 94 by g times to generate a control voltage g x Vs; and a power consumption unit 98 which causes a power semiconductor to consume power by causing a required current Id to flow to the power semiconductor according to the control voltage g x Vs generated by the control voltage amplification unit 96.
According to this aspect, the inter-terminal voltage monitoring unit 94 monitors the voltage VAB applied between both the terminals A and B of the dummy load unit 92 to generate the control voltage Vs and adjusts the level of the control voltage Vs such that the voltage VAB applied between both the terminals A and B is constant, the control voltage amplification unit 96 amplifies the control voltage Vs generated by the inter-terminal voltage monitoring unit 94 by g times to generate the control voltage g X Vs, and the power consumption unit 98 causes the power semiconductor to consume power by causing the required current Id to flow to the power semiconductor according to the control voltage g X Vs generated by the control voltage amplification unit 96 in each of the dummy load units 92.
As a result, it is possible to consume the surplus power that is no longer consumed in an observation device switched from a power supply state to a non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
In addition, it is possible to cover the power to be consumed in the observation device, switched from the non-power supply state to the power supply state, with the power that is being consumed in the dummy load device, and it is possible to easily perform the exchange of the surplus power between the observation device and the dummy load device with the simple configuration.
[0062]
<Third Aspect>
An inter-terminal voltage monitoring unit 94 of this aspect is characterized by having a semiconductor for monitoring a voltage VAB applied between both terminals A
and B and generating a control voltage Vs by adjusting the amount of a current flowing through the semiconductor such that the voltage VAE applied between both the terminals A
and B is constant without depending on a current Id flowing through a power semiconductor provided in a power consumption unit 98.
According to this aspect, the inter-terminal voltage monitoring unit 94 has the semiconductor for monitoring the voltage VAB applied between both the terminals A and B and generates the control voltage Vs by adjusting the amount of the current flowing through the semiconductor such that the voltage VAB applied between both the terminals A and B is constant without depending on the current Id flowing through the power semiconductor provided in the power consumption unit 98.
Accordingly, it is possible to adjust the amount of the current flowing through the semiconductor such that the voltage VAB applied between both the terminals A and B is constant without depending on the current Id flowing through the power semiconductor provided in the power consumption unit 98, and it is possible to consume surplus power that is no longer consumed in an observation device switched from a power supply state to a non-power supply state by a dummy load device 90 in which a plurality of dummy load units 92 is connected in series.
[0063]
<Fourth Aspect>
A power semiconductor of this aspect is characterized by being any one of a transistor, a field effect transistor, and an IGBT.
According to this aspect, it is possible to consume power applied between two terminals by the power semiconductor since the power semiconductor is any one of the transistor, the field effect transistor, and the IGBT.
As a result, it is possible to consume surplus power that is no longer consumed in an observation device, switched from a power supply state to a non-power supply state, by a dummy load device.
[0064]
<Fifth Aspect>
A dummy load device 90 of this aspect is characterized in that a current flowing through the dummy load device 90 decreases when the number of observation devices 100 (devices) connected to a control unit 70 (power distribution unit) increases, and the current flowing through the dummy load device 90 increases when the number of the observation devices 100 (devices) connected to the control unit 70 decreases.
According to this aspect, the current flowing through the dummy load device 90 decreases when the number of the observation devices 100 connected to the control unit 70 increases, and the current flowing through the dummy load device 90 increases when the number of observation devices 100 connected to the control unit 70 decreases in the dummy load device 90.
As a result, the dummy load device 90 can consume surplus power in accordance with an increase or a decrease of the number of observation devices 100.
As a result, when the number of the observation devices 100 connected to the control unit 70 decreases, it is possible to consume the surplus power that is no longer consumed in the observation device 100, switched from a power supply state to a non-power supply state, by the dummy load device, and it is possible to provide a power supply system capable of consuming the surplus power that is no longer consumed with a simple configuration.
In addition, when the number of the observation devices 100 connected to the control unit 70 increases, it is possible to cover the power to be consumed in the observation device 100, switched from the non-power supply state to the power supply state, with the power that is being consumed in the dummy load device, and it is possible to provide the power supply system capable of easily performing exchange of the surplus power between the observation device and the dummy load device with the simple configuration.
[0065]
<Sixth Aspect>
A dummy load device 90 of this aspect is a dummy load device including a plurality of dummy load units 92 connected in series, and each of the dummy load units 92 is characterized by including: an inter-terminal voltage monitoring unit 94 which monitors a voltage VAB applied between both terminals A and B of the dummy load unit 92 to generate a control voltage Vs and adjusts a level of the control voltage Vs such that the voltage \TAB applied between both the terminals A and B is constant; a control voltage amplification unit 96 which amplifies the control voltage Vs generated by the inter-terminal voltage monitoring unit 94 by g times to generate a control voltage g x Vs; and a power consumption unit 98 which causes a power semiconductor to consume power by causing a required current Id to flow to the power semiconductor according to the control voltage g x Vs generated by the control voltage amplification unit 96.
According to this aspect, the inter-terminal voltage monitoring unit 94 monitors the voltage VAB applied between both the terminals A and B of the dummy load unit 92 to generate the control voltage Vs and adjusts the level of the control voltage Vs such that the voltage VAB applied between both the terminals A and B is constant, the control voltage amplification unit 96 amplifies the control voltage Vs generated by the inter-terminal voltage monitoring unit 94 by g times to generate the control voltage g x Vs, and the power consumption unit 98 causes the power semiconductor to consume power by causing the required current Id to flow to the power semiconductor according to the control voltage g x Vs generated by the control voltage amplification unit 96 in each of the dummy load units 92.
As a result, it is possible to consume the surplus power that is no longer consumed in an observation device switched from a power supply state to a non-power supply state by the dummy load device 90 in which the plurality of dummy load units 92 is connected in series.
In addition, it is possible to cover the power to be consumed in the observation device, switched from the non-power supply state to the power supply state, with the power that is being consumed in the dummy load device, and it is possible to easily perform the exchange of the surplus power between the observation device and the dummy load device with the simple configuration.
[0066]
As above, the present invention has been described with reference to the example in which the parent device on the shore and the child device on the seafloor are connected via the subsea cable. However, the present invention is not limited to this example, but can be applied to all scenes where power is supplied to a child device installed in a remote place that is secluded, for example, when power is supplied to an eruption monitoring device installed near a crater of a volcano, when power is supplied to a dam level monitoring device, and the like.
In addition, the present invention can be also applied to a system which relates to power supply on shore and supplies power in a DC system to each house or a room of each house.
Description of the reference numerals [0067]
1.. .Power supply system, 2.. .Onshore control device (Control means), 4. ..Control cable, 10. ..Onshore power supply device (Power supply means), 11. ..Ground, 12...Power line, 16. ..Subsea cable, 20.. .Subsea device (Child device), 22.. .Functional sea ground, 40.. .Transmission unit, 42.. .Cable, 62.. .Power supply line pass relay, 64,66.. .Main DC/DC converter, 65,67.. .Switch SW, 50.. .Drive power supply unit, 60.. .Receiving unit, 70.. .Control unit, 72.. .Output DC/DC converter, 80.. .Output unit, 90.. .Dummy load device, 92.. .Dummy load unit, 94,104.. .Inter-terminal voltage monitoring unit, 96.. .Control voltage amplification unit, 98,108,118.. .Power consumption unit, 100.. .Observation device, 106...Control voltage generation unit, 114.. .Control unit, 116.. .Amplification unit
Claims (5)
1. A power supply system comprising:
a parent device which has a power supply means and a control means; and a child device which is connected to the parent device via a cable, wherein the child device includes:
a DC power conversion unit which converts first DC
power supplied to a primary side into second DC power and outputs the second DC power to a secondary side; and a power distribution unit which distributes the second DC power to a dummy load device and at least one of devices, wherein the dummy load device includes a plurality of dummy load units connected in series, and each of the dummy load units includes:
an inter-terminal voltage monitoring unit which monitors a voltage applied between both terminals of the dummy load unit to generate a first control voltage and adjusts a level of the first control voltage such that the voltage applied between both the terminals is constant;
a control voltage amplification unit which amplifies the first control voltage generated by the inter-terminal voltage monitoring unit to generate a second control voltage; and a power consumption unit which causes a power semiconductor to consume power by causing a required current to flow to the power semiconductor according to the second control voltage generated by the control voltage amplification unit, and the dummy load device is connected to the primary side or the secondary side of the DC power conversion unit and consumes surplus power out of the first DC power or the second DC power in accordance with an increase or a decrease of a number of the devices connected to the power distribution unit.
a parent device which has a power supply means and a control means; and a child device which is connected to the parent device via a cable, wherein the child device includes:
a DC power conversion unit which converts first DC
power supplied to a primary side into second DC power and outputs the second DC power to a secondary side; and a power distribution unit which distributes the second DC power to a dummy load device and at least one of devices, wherein the dummy load device includes a plurality of dummy load units connected in series, and each of the dummy load units includes:
an inter-terminal voltage monitoring unit which monitors a voltage applied between both terminals of the dummy load unit to generate a first control voltage and adjusts a level of the first control voltage such that the voltage applied between both the terminals is constant;
a control voltage amplification unit which amplifies the first control voltage generated by the inter-terminal voltage monitoring unit to generate a second control voltage; and a power consumption unit which causes a power semiconductor to consume power by causing a required current to flow to the power semiconductor according to the second control voltage generated by the control voltage amplification unit, and the dummy load device is connected to the primary side or the secondary side of the DC power conversion unit and consumes surplus power out of the first DC power or the second DC power in accordance with an increase or a decrease of a number of the devices connected to the power distribution unit.
2. The power supply system according to claim 1, wherein the inter-terminal voltage monitoring unit has a semiconductor for monitoring the voltage applied between both the terminals and generates the first control voltage by adjusting an amount of a current flowing through the semiconductor such that the voltage applied between both the terminals is constant without depending on a current flowing through the power semiconductor provided in the power consumption unit.
3. The power supply system according to claim 1 or 2, wherein the power semiconductor is any one of a transistor, a field effect transistor, and an IGBT.
4. The power supply system according to any one of claims 1 to 3, wherein the dummy load device is configured such that a current flowing through the dummy load unit decreases when the number of the devices connected to the power distribution unit increases, and a current flowing through the dummy load unit increases when the number of the devices connected to the power distribution unit decreases.
5. A dummy load device comprising a plurality of dummy load units connected in series, wherein each of the dummy load units includes:
an inter-terminal voltage monitoring unit which monitors a voltage applied between both terminals of the dummy load unit to generate a first control voltage and adjusts a level of the first control voltage such that the voltage applied between both the terminals is constant;
a control voltage amplification unit which amplifies the first control voltage generated by the inter-terminal voltage monitoring unit to generate a second control voltage; and a power consumption unit which causes a power semiconductor to consume power by causing a required current to flow to the power semiconductor according to the second control voltage generated by the control voltage amplification unit.
an inter-terminal voltage monitoring unit which monitors a voltage applied between both terminals of the dummy load unit to generate a first control voltage and adjusts a level of the first control voltage such that the voltage applied between both the terminals is constant;
a control voltage amplification unit which amplifies the first control voltage generated by the inter-terminal voltage monitoring unit to generate a second control voltage; and a power consumption unit which causes a power semiconductor to consume power by causing a required current to flow to the power semiconductor according to the second control voltage generated by the control voltage amplification unit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-069043 | 2016-03-30 | ||
| JP2016069043A JP6578602B2 (en) | 2016-03-30 | 2016-03-30 | Power supply system |
| PCT/JP2017/002941 WO2017169054A1 (en) | 2016-03-30 | 2017-01-27 | Power supply system, and dummy load device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2994098A1 CA2994098A1 (en) | 2017-10-05 |
| CA2994098C true CA2994098C (en) | 2019-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2994098A Active CA2994098C (en) | 2016-03-30 | 2017-01-27 | Power supply system and dummy load device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6578602B2 (en) |
| CA (1) | CA2994098C (en) |
| WO (1) | WO2017169054A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6066239U (en) * | 1983-10-13 | 1985-05-10 | 日本電気株式会社 | Power recovery type power supply device |
| WO2000038304A1 (en) * | 1998-12-18 | 2000-06-29 | Koninklijke Philips Electronics N.V. | Switched-mode power supply with a dummy load |
| JP2009148717A (en) * | 2007-12-21 | 2009-07-09 | Seiko Epson Corp | Droplet discharge head, droplet discharge device, and method for manufacturing membrane |
| JP5396309B2 (en) * | 2010-03-01 | 2014-01-22 | 富士通テレコムネットワークス株式会社 | Power supply device |
-
2016
- 2016-03-30 JP JP2016069043A patent/JP6578602B2/en active Active
-
2017
- 2017-01-27 WO PCT/JP2017/002941 patent/WO2017169054A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2017184474A (en) | 2017-10-05 |
| WO2017169054A1 (en) | 2017-10-05 |
| CA2994098A1 (en) | 2017-10-05 |
| JP6578602B2 (en) | 2019-09-25 |
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