JP2012228099A - Direct current power apparatus drive system and dc apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce electricity cost by avoiding power supply from a commercial power system in a direct current power apparatus drive system.SOLUTION: A DC apparatus obtains a required minimum power value for the work under the setting by a user through a remote control operation and a switch operation. Then, the DC apparatus compares the required minimum power value with an allowable power value to be supplied received from a power converter. When the allowable power value to be supplied is larger than the required minimum power value, the DC apparatus works under a setting compliance mode in which operation is performed according to the setting by the user. When the allowable power value to be supplied is less than the required minimum power value, the DC apparatus works under a power suppression mode in which operation is performed within the allowable power value to be supplied.

Description

  The present invention relates to a system that distributes DC power, in particular, a DC power distribution system that is used in a distributed power source such as a solar battery or a storage battery, or a household having a DC load, etc. It relates to the control of the converter.

  Conventionally, power distribution systems in ordinary homes and offices have been mainly AC power distribution using commercial power. On the other hand, there are cases where a DC power generation device such as a solar cell or a fuel cell or a power storage device such as a lead storage battery is installed as a distributed power source. In this case, the DC voltage obtained by power generation or the like is boosted or reduced as necessary. The voltage is stepped down, converted into alternating current by a direct current / alternating current power converter, and connected to an alternating current power supply system for commercial power.

  On the other hand, in recent years, direct current power obtained from fuel cells and solar power generation devices, and electric devices that operate using the direct current power of storage batteries as a drive source have been discussed as means for improving energy savings. In addition, it is considered that a DC power distribution system for stably supplying DC power to such DC-compatible electric devices is widely used in houses and buildings.

  For example, the one disclosed in Patent Document 1 converts direct current power generated by a distributed power source into direct current power of a desired voltage by a power converter, and direct current such as a direct current outlet installed in each room such as a house. A DC power distribution system that distributes power to the outlet via a DC supply line is connected to a lighting device equipped with a light emitting diode (LED) as a light source and a DC device that operates by receiving DC power such as a personal computer. Assuming that the DC power is supplied to the DC equipment, it is stated that the AC / DC converter circuit is not required and the cost merit and energy saving improvement effect can be obtained. Yes.

  FIG. 11 shows a system disclosed in Patent Document 1.

  For example, the fuel cell 21 is connected to the output of the fuel cell 21 and the AC terminal is connected to the commercial power supply system 1 and the AC outlet group 10 for AC load. The converter 8, the DC power converter 9 whose input is connected to the output of the fuel cell 21 and the DC terminal of the bidirectional DC / AC power converter 8, and the DC load connected to the DC power converter 9 It is comprised by the DC outlet group 11 for.

  Distribution of power to the DC outlet is performed only through the DC power converter 9 when the fuel cell 21 is generating power, and bidirectional DC / AC power conversion from the commercial power supply system 1 when the fuel cell is stopped or started. It is assumed that this is performed via the device 8 and the DC power converter 9.

  In addition, those disclosed in Patent Document 2 and Patent Document 3 describe a system or a device that uses a commercial power system and DC power output from a solar battery, and the power required by the device is solar power. In the case where the DC power output from the battery alone is insufficient, a configuration is described in which the shortage can be covered by the AC power from the commercial power supply system.

JP 2003-204682 A JP 2002-330555 A JP-A-6-351266

  However, in the systems shown in Patent Document 1 and Patent Document 2 described above, when the power that can be supplied by the distributed power source such as the fuel cell or the solar cell becomes insufficient, the connected devices are not connected. Because power shortage information is not communicated, and the device side relies on power supply from the commercial power system without being operated with reduced power consumption, optimal control is not necessarily performed from the viewpoint of energy saving I could not say.

  Moreover, in the system configuration as shown in Patent Document 3 described above, the AC / DC conversion circuit is still arranged in the device, and the cost merit in the device using DC power is not sufficiently drawn out. Rather, there is a concern that the cost increases due to the addition of parts required by using both AC power and DC power.

  The present invention solves the above-mentioned problems, and is capable of maximally suppressing power supply from a commercial power system by cooperative control between a device driven by DC power and a power converter in a DC power distribution system. An object is to provide a power device drive system.

  In order to solve the conventional problem, a DC power equipment driving system of the present invention includes at least a distributed power supply, a DC equipment that receives and drives DC power, and is inserted between the distributed power supply and the DC equipment, In a DC power equipment drive system configured with a power converter provided with a distributed power supply detecting means for detecting power input from a distributed power supply, the power converter is input power obtained by the distributed power supply detecting means. Necessary power value that can be output from the information to the DC device is derived, data is transmitted to the DC device, and the DC device is required to operate in response to user settings by remote control operation or switch operation After obtaining the minimum power value, compare it with the suppliable power value received from the data. Operating in set-compliant mode which performs, characterized in that it operates in the power saving mode to operate in the available power range to be less than the required minimum power supply can power value.

  Thus, since the DC device is operated as much as possible within the range of electric power generated in the distributed power supply, it is possible to realize a highly convenient system that does not repeat the operation stop and the operation restart.

  According to the DC power equipment drive system of the present invention, it is possible to suppress the power supply from the commercial power system to the maximum while ensuring the minimum convenience, and in addition to the large power in the power transfer by the power line. It is advantageous from the viewpoint of safety because it is not frequently transported, and it leads to longer life in functional parts such as motors and actuators as well as electronic parts mounted in the circuit in equipment. The effect can also be expected.

The figure which shows the structure of the DC power equipment drive system in Embodiment 1. FIG. The figure which shows the inside of the power converter in Embodiment 1 The figure which shows the inside of the direct current | flow apparatus in Embodiment 1. The figure which shows the state which connected the fuel cell in Embodiment 1 to the wiring The figure which shows a part of control flow of DC apparatus in Embodiment 1 and a power converter The figure which shows the structure of the DC power equipment drive system in Embodiment 2. FIG. The figure which shows the inside of the power converter at the time of connecting the storage battery in Embodiment 2. The figure which shows a part of control flow of the direct current | flow apparatus in Embodiment 2. The figure which shows a part of structure of the direct-current power equipment drive system in Embodiment 3. The figure which shows a part of structure of the direct-current power equipment drive system in Embodiment 4. The figure which shows the structure of the apparatus in the in-house power distribution by the prior art

  A first invention includes at least a distributed power source, a DC device that receives and drives DC power, and a distributed power source detection unit that is inserted between the distributed power source and the DC device and detects power input from the distributed power source. In the DC power equipment drive system configured with the power converter, the power converter derives a suppliable power value that can be output to the DC equipment from the input power information obtained by the distributed power source detection means, Data is transmitted to the device, and the DC device obtains the minimum power value required to operate according to the user's setting by remote control operation or switch operation, and then compares it with the suppliable power value received by the data supply. If the possible power value is greater than the required minimum power value, the system will operate in the setting compliance mode in which operation is performed according to the user's settings. It is characterized in that operating in the power saving mode to operate within.

  Thus, since the DC device is operated as much as possible within the range of electric power generated in the distributed power supply, it is possible to realize a highly convenient system that does not repeat the operation stop and the operation restart.

  According to the second invention, in particular, the DC device of the first invention receives power from the commercial power supply system when a remote control operation or switch operation is performed to increase the driving capability while operating in the power suppression mode, and the setting conforms to It is characterized by shifting to operation in mode.

  As a result, the DC power supply is operated within the range of power generated by the distributed power source as much as possible, so power supply from the commercial power system is ensured while ensuring the convenience of not stopping and restarting operation. It is possible to realize a highly energy-saving system that can keep the minimum required.

  The third aspect of the invention relates to power line carrier communication using a power line connected between the power converter and the DC device, particularly for data communication performed from the power converter of the first or second invention to the DC device. It is characterized by being performed by.

  As a result, it is possible to realize a system that can operate without providing a dedicated wiring for data communication and has excellent installation workability.

  In the fourth aspect of the invention, the DC communication device and the power converter of the first or second invention are provided with wireless communication means, and data communication performed from the power converter to the DC device is performed by the wireless communication means. It is characterized by this.

  As a result, it is possible to realize a system that can operate without providing a dedicated wiring for data communication and has excellent installation workability.

A fifth aspect of the present invention is a DC device electrically connected to a power converter that converts power input from various power sources and outputs DC power, and the suppliable power value transmitted from the power converter is Receiving means for receiving the information to be expressed, and obtaining the minimum power value required to operate in response to the user's setting by remote control operation or switch operation. If the suppliable power value is greater than the minimum required power value, the DC device is used. A control unit that operates in a setting compliant mode that operates according to the user's settings, and operates in a power suppression mode that operates the DC device within the suppliable power range if the suppliable power value does not satisfy the required minimum power. It is characterized by.

  Thereby, even if power supply is insufficient, it is possible to realize a highly convenient DC device that does not repeatedly stop operation and restart operation.

  In the sixth aspect of the invention, in particular, when the DC device of the fifth aspect of the invention is operated in the power suppression mode when a remote control operation or a switch operation is performed to increase the driving ability, the power supply is received from the commercial power supply system, and the setting conforms to It is characterized by shifting to operation in mode.

  As a result, it is possible to realize a highly energy-saving DC device capable of keeping the power supply from the commercial power system to the minimum necessary while ensuring the convenience of not repeating the operation stop and the operation restart.

  The present invention can attain the object of the present invention by making the main parts of the first to sixth inventions into embodiments, so the details of the embodiments corresponding to each claim will be described below with reference to the drawings. The description will be made with reference to the description of embodiments for carrying out the present invention.

  Note that the present invention is not limited to the present embodiment. Further, in the description of each embodiment, the same configuration and the same function and effect are given the same reference numerals, and redundant description will not be given.

(Embodiment 1)
FIG. 1 is an explanatory diagram showing a configuration of a DC power equipment drive system according to Embodiment 1 of the present invention.

  The DC device 4 is connected so that the DC power output from the power converter 3 is supplied via the home wiring 7, and the power converter 3 is wired so that the output power of the distributed power source 2 is input. Therefore, as a power source for driving the DC device 4, the DC device 4 can be driven by the power output from the distributed power source 2.

  FIG. 2 shows the inside of the power converter 3 in detail.

  The power converter 3 is provided with a power converter control unit 34 in addition to the distributed power source detection means 31 and the power conversion circuit 32, and the power converter control unit 34 uses a data communication wiring 73. Data communication with the DC device 4 performed, recognition of power information output by the distributed power source detected by the distributed power source power detection means 31, and control of the power conversion circuit 32 are performed.

  The distributed power supply detection means 31 has a function of detecting a voltage by the resistor 35 disposed between the positive side wiring 71 and the negative side wiring 72 that performs DC power transfer, and the negative side wiring 72 that performs the DC power transfer. The current sensor 33 has a function of detecting current.

  In the power conversion circuit 32, a choke coil 37 and a diode 39 are arranged on a positive wiring 71 that carries DC power, and a switching element 38 is connected between the connection point between them and the negative wiring 72. At the same time, the capacitor 36 is also connected between the cathode side of the diode 39 and the negative side wiring 72.

With the configuration described above, the power conversion circuit 32 has a unidirectional step-up DCDC converter function achieved by PWM control of the switching element 38 by the power converter control unit 34, and is more than the output voltage from the distributed power supply 2. A high voltage can be supplied to the DC device 4.

  FIG. 3 shows the inside of the DC device 4 in detail.

  The DC device 4 includes a DC circuit controller 42 that controls the DC device 4 and a power supply circuit that adjusts the DC power carried by the positive-side wiring 71 and the negative-side wiring 72 to a voltage at which the DC-device control unit 42 can operate. 41 includes a device drive unit 43 that operates an actuator such as a motor or a valve, and an interface unit 44 such as an operation switch or a touch panel.

  In addition, the DC device control unit 42 enables data communication with the power converter 3 using the data communication wiring 73.

  FIG. 4 shows a state in which the fuel cell 21, the power converter 3, and the DC device 4 are connected by wiring when the fuel cell 21 is used as a specific example of the distributed power source 2 in FIG.

  The fuel cell 21 and the power converter 3 are connected by two home wirings, a positive side wiring 71 and a negative side wiring 72 for carrying DC power, and the power converter 3 and the DC device 4 are connected to the positive side wiring 71 and the negative side wiring. The wiring 72 and the data communication wiring 73 are connected by three home wirings.

  FIG. 5 shows a control flow of the power converter 3 and the DC device 4 in the configuration shown in FIG.

  First, the power converter control unit 34 recognizes the output power of the distributed power supply 2 from the voltage / current information obtained by the distributed power supply power detection means 31 (Step 1), and further obtains the voltage / current information obtained by the distributed power supply power detection means 31. Based on the control, the power conversion circuit 32 is controlled by the PWM control of the switching element 38 (Step 2). The power converter 3 calculates the power value that can be supplied to the DC device 4 by the recognized output power of the distributed power source 2 and the control state of the power conversion circuit 32 (Step 3), and transmits data to the DC device 4 as a suppliable power value. (Step 4).

  When the suppliable power value is received (Step 5), the DC device control unit 42 recognizes the setting made by the user using the interface unit 44 such as an operation switch or a touch panel (Step 6), and sets the DC device 4 to the setting. The required minimum power value for operating as described above is calculated (Step 7).

  Next, the DC device control unit 42 compares the supplied suppliable power value with the calculated necessary minimum power value (Step 8), and if the suppliable power value is larger than the necessary minimum power value, it operates as set by the user. The device drive unit 43 is operated in the setting compliance mode (Step 9).

  If the suppliable power value is less than the required minimum power value by comparing the supplied suppliable power value with the calculated minimum required power value, the device drive unit 43 is operated in the power suppression mode that operates within the suppliable power range. (Step 10).

  According to the configuration and control described above, in the first embodiment, even if the power required by the DC device is not sufficiently secured in the distributed power supply, the DC device inevitably stops operation and resumes operation. This makes it possible to realize a highly convenient system that operates within the range of power generated by the distributed power source as much as possible.

In addition, although it was set as the case of the fuel cell 21 as a specific example of the distributed power supply 2 in FIG. 4, it is also possible to use a solar cell other than the fuel cell 21, and in that case, the power converter control part of the power converter 3 If maximum power point tracking control for the purpose of taking out the energy of the solar cell as power as much as possible is performed in 34, a more efficient system can be obtained.

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to the drawings.

  FIG. 6 is an explanatory diagram showing the configuration of the DC power equipment drive system according to Embodiment 2 of the present invention.

  The AC power output from the commercial power supply system 1 is conveyed via the home wiring 7, supplied to the AC / DC power converter 5 and the AC device 6, and the DC power converted by the AC / DC power converter 5 is the DC device. 4 is connected to be supplied.

  Further, the DC device 4 is connected to the DC power output from the power converter 3 via the home wiring 7, and the output power of the distributed power source 2 is input to the power converter 3. Thus, as a power source for driving the DC device 4, the DC device 4 can be driven by power output from the commercial power supply system 1 and the distributed power supply 2.

  FIG. 7 shows in detail the inside of the power converter 3 when the storage battery 22 is used as a distributed power source.

  Similar to the power converter 3 shown in FIG. 2, a distributed power source detection unit 31, a power conversion circuit 32, and a power converter control unit 34 are provided. In the power converter control unit 34, a data communication wiring 73 is provided. Is used for data communication with the DC device 4, recognition of power information output by the distributed power source detected by the distributed power source power detection means 31, and control of the power conversion circuit 32.

  In the power conversion circuit 32, a first switching element 38 in which a choke coil 37 and a first diode 39 are connected in parallel is arranged on a positive wiring 71 that carries DC power, and a connection point between the two and a negative wiring. The second switching element 38 in which the second diode 39 is connected in parallel is connected between the capacitor 72 and the capacitor 36 is connected between the collector side of the first switching element 38 and the negative wiring 72. Connected.

  With the configuration described above, the power conversion circuit 32 has a bidirectional step-up / step-down DCDC converter function achieved by PWM control of both the first and second switching elements 38 by the power converter control unit 34. It is possible to supply a voltage higher than the output voltage from the DC device 4 to the DC device 4, and it is also possible to step down the power output from the other distributed power source 2 or the commercial power source system 1 and transport it to the storage battery 22. is there.

  FIG. 8 shows a control flow of the DC device 4 in the configuration shown in FIG. When receiving the suppliable power value sent from the power converter 3 (Step 1), the DC device control unit 42 recognizes the setting made by the user through the interface unit 44 such as an operation switch or a touch panel (Step 2). The required minimum power value for operating the DC device 4 according to the setting is calculated (Step 3).

  Next, the DC device control unit 42 compares the supplied suppliable power value with the calculated required minimum power value (Step 4), and if the suppliable power value is larger than the required minimum power value, the power from the distributed power source 2 is The power converter 3 and the AC / DC power converter 5 are instructed by data communication so as to be supplied (Step 5), and the device driving unit 43 is operated in the setting conforming mode that operates according to the setting of the user (Step 6).

  Remote control operation and switch to increase the user's driving ability while operating in power suppression mode if the available power value does not meet the required minimum power value by comparing the available received power value with the calculated minimum required power value It is determined whether or not the operation has been performed (Step 7). If there is a request operation for increasing the driving capability, the power converter 3 and the AC / DC power converter 5 are supplied with the power supply from the commercial power supply system 1. Instructed by data communication (Step 8), the device drive unit 43 is operated in a setting conforming mode that operates according to the setting of the user (Step 6). Further, in the determination of whether or not a remote control operation or a switch operation for increasing the user's driving ability is performed during operation in the power suppression mode (Step 7), if there is no request operation for increasing the driving ability, the power from the distributed power source 2 is Instruct the power converter 3 and the AC / DC power converter 5 to be supplied by data communication (Step 9), and operate in the power supply range generated from the distributed power source 2 in the power suppression mode, the device drive unit 43 Is operated (Step 10).

  According to the configuration and control described above, in the second embodiment, even if the power required by the DC device is not sufficiently ensured in the distributed power supply, the DC device suspends operation and resumes operation. Energy-saving performance that can keep the power supply from the commercial power system to the minimum necessary while ensuring the convenience of operating within the range of power generated by the distributed power source as much as possible. It became possible to realize a high system.

(Embodiment 3)
Next, Embodiment 3 of the present invention will be described with reference to the drawings.

  FIG. 9 shows a state where the power converter 3 and the DC device 4 of the DC power device drive system according to Embodiment 3 of the present invention are connected by wiring.

  The power converter 3 and the DC device 4 are provided with a modulation / demodulation device 74, and by performing power line carrier communication in which a data signal is superimposed on the positive side wiring 71 and the negative side wiring 72 for DC power carrier, The DC device 4 is configured to be connected by two home wirings of a positive side wiring 71 and a negative side wiring 72.

  Regarding data communication in the third embodiment of the present invention, first, a data signal having a required minimum power value transmitted from the DC device control unit 42 via the data communication wiring 73 is transmitted by the modem 74 of the DC device 4. The modulated signal is further superimposed on the DC voltage between the positive side wiring 71 and the negative side wiring 72 and sent to the power converter 3.

  Further, the modulation / demodulation device 74 of the power converter 3 demodulates the data signal superimposed on the DC voltage between the positive side wiring 71 and the negative side wiring 72 and passes it to the power converter control unit 34 via the data communication wiring 73. It was supposed to be sent.

  As a result, the system can operate in cooperation without providing dedicated wiring for data communication in the home wiring, and a system with excellent installation workability can be realized.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described with reference to the drawings.

  FIG. 10 shows a state where the power converter 3 and the DC device 4 of the DC power device driving system according to Embodiment 4 of the present invention are wire-connected.

By providing the power converter 3 and the DC device 4 with the wireless communication adapter 75 and performing wireless communication between the two devices, the power converter 3 and the DC device 4 are connected to the two homes of the positive wiring 71 and the negative wiring 72. It was set as the structure connected by wiring.

  Regarding data communication in the fourth embodiment of the present invention, a data signal having a minimum required power value transmitted from the DC device control unit 42 via the data communication wiring 73 is wirelessly transmitted by the wireless communication adapter 75 of the DC device 4. The radio wave 76 is emitted as a radio wave 76, picked up by the radio communication adapter 75 of the power converter 3, and sent to the power converter control unit 34 via the data communication wiring 73.

  As a result, as in the third embodiment of the present invention, the system can operate in cooperation with the home wiring without providing a dedicated wiring for data communication, and a system excellent in installation workability can be realized.

  Although various embodiments of the present invention have been described above, the present invention is not limited to the matters shown in the above-described embodiments, and those skilled in the art can make modifications and applications based on the description and well-known techniques. This is also the scope of the present invention, and is included in the scope for which protection is sought.

  The present invention can be applied not only to a residential power distribution system, but also to a commercial building or factory, or a direct current power distribution system in an area where local production for local consumption of electricity is not provided. is there.

DESCRIPTION OF SYMBOLS 1 Commercial power supply system 2 Distributed power supply 3 Power converter 4 DC equipment 5 AC / DC power converter 6 AC equipment 7 Home wiring 8 Bidirectional DC / AC power converter 9 DC power converter 10 AC outlet group 11 DC outlet group 21 Fuel cell 22 Storage battery 31 Distributed power source detection means 32 Power conversion circuit 33 Current sensor 34 Power converter control unit 35 Resistor 36 Capacitor 37 Choke coil 38 Switching element 39 Diode 41 Power supply circuit 42 DC device control unit 43 Device drive unit 44 Interface Unit 71 Positive side wiring 72 Negative side wiring 73 Data communication wiring 74 Modulator / Demodulator 75 Wireless communication adapter 76 Radio wave

Claims (6)

At least with distributed power,
DC equipment that receives and drives DC power;
A power converter provided with a distributed power supply detection unit that is inserted between the distributed power supply and the DC device and detects power input from the distributed power supply;
In a DC power equipment drive system composed of
The power converter derives a suppliable power value that can be output to the DC device from the input power information obtained by the distributed power source detection means, performs data transmission to the DC device,
The DC device determines the necessary minimum power value for operating against the user's setting by remote control operation or switch operation, and then compares it with the suppliable power value received by the data,
If the suppliable power value is larger than the required minimum power value, it operates in the setting compliance mode in which operation is performed according to the user's setting,
A DC power equipment drive system that operates in a power suppression mode that operates within a power supply range if the power supply value is less than the required minimum power. The DC power equipment drive system according to claim 1,
The DC device receives power from a commercial power system when a remote control operation or switch operation is performed to increase the driving capability during operation in the power suppression mode, and the operation is performed in the setting compliance mode. Power equipment drive system. The DC power equipment drive system according to claim 1 or 2,
DC power device drive characterized in that data communication performed from the power converter to the DC device is performed by power line carrier communication using a power line connected between the power converter and the DC device. system. The DC power equipment drive system according to claim 1 or 2,
The DC device and the power converter are provided with wireless communication means,
A DC power equipment driving system, wherein data communication performed from the power converter to the DC equipment is performed by the wireless communication means. A DC device that is electrically connected to a power converter that converts power input from various power sources and outputs DC power,
Receiving means for receiving information representing a suppliable power value transmitted from the power converter;
Setting to obtain the minimum required power value to operate in response to the user's setting by remote control operation or switch operation, and to operate the DC device as set by the user if the suppliable power value is larger than the required minimum power value A DC device comprising control means that operates in a compliant mode and operates in a power suppression mode in which the DC device is operated within a suppliable power range if the suppliable power value does not satisfy the required minimum power. The DC device according to claim 5,
A DC device that receives power from a commercial power supply system when a remote control operation or switch operation is performed while operating in the power suppression mode, and shifts to operation in the setting compliance mode.

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