CN109193612B - Constant-current power supply system of cable system seabed observation network with stably adjusted total output power of nodes - Google Patents
Constant-current power supply system of cable system seabed observation network with stably adjusted total output power of nodes Download PDFInfo
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- CN109193612B CN109193612B CN201811109393.4A CN201811109393A CN109193612B CN 109193612 B CN109193612 B CN 109193612B CN 201811109393 A CN201811109393 A CN 201811109393A CN 109193612 B CN109193612 B CN 109193612B
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- 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
- H02J1/10—Parallel operation of dc sources
Abstract
The invention discloses a cable system seabed observation network constant current power supply system with stably adjusted node total output power, which comprises: a constant current power supply; an external load; a DC/DC module, DC/DC-1-DC/DC-n; further comprising: switches K connected in parallel to the DC/DC-1-DC/DC-n input sides, respectively11—Kn1(ii) a The power balancer is respectively connected with the DC/DC-1-DC/DC-n output sides in parallel, can be automatically adjusted according to the load size, has an adjustable range of equivalent resistance value from a certain value to infinity, and has the equivalent resistance value fixed by an external signal; switch K with one side connected to output voltage line and the other side connected to high voltage at output side of DC/DC-2-DC/DC-n22—Kn2(ii) a The current flowing through the controllable load is adjustable and ranges from 0A to the maximum output current of the DC/DC module; a switch K with one side connected with the input end of the current controllable load and the other side connected with the high voltage line at the output side of the DC/DC-1-DC/DC-n13—Kn3(ii) a The invention ensures the energy utilization rate of the constant-current observation network and also ensures the stability and reliability of the system.
Description
Technical Field
The invention belongs to the field of ocean detection, and particularly relates to a constant-current power supply system of a cable system seabed observation network for stably adjusting the total output power of nodes.
Background
The traditional ocean observation mode is mainly ship-based survey, but is limited by factors such as ship time, weather and the like, and the ship-based survey can only be intermittent or scattered. The satellite remote-measuring and remote-sensing earth observation system realizes the long-term and continuity of observation on the ground and the sea surface, but cannot penetrate through the huge seawater to directly observe the deep sea bottom. Self-contained or anchored bottom-engaging devices deployed by ships can only support short-term power supply of a small amount of subsea equipment, cannot transmit data in real time, and also require frequent periodic maintenance. Various underwater vehicles are powerful tools for detecting deep sea environment, can reveal the diversity and complexity of deep sea oceans, but cannot squat and guard the deep sea for a long time because the underwater vehicles still depend on self-contained batteries for power supply. Aiming at the scientific requirements of long-term, in-situ, real-time and high-resolution observation, the cable system seabed scientific observation network (hereinafter referred to as the observation network) becomes an important tool for oceanographic research.
The observation network is a submarine scientific infrastructure capable of continuously providing electric power and communication services for a long time, and the electric power system and the communication system are directly extended to the seabed from the land through the photoelectric composite communication submarine cable, so that two problems of continuous electric energy supply and mass data transmission of a large number of in-situ observation equipment in submarine long-term operation are solved, and high-resolution in-situ real-time observation on physical, chemical, biological and geological processes and the like in a specific area of the deep ocean can be directly carried out from the seabed. The observation network can observe the ocean below the sea bottom downwards, can observe the water layer of the ocean upwards through the anchor system, and can be connected with various movable observation platforms through the underwater docking station, so that various limitations of the traditional ocean research mode are eliminated, scientists can monitor deep sea experiments in a shore laboratory in real time, remotely monitor various sudden events such as ocean storm surge, volcanic eruption, earthquake, tsunami, landslide, red tide and the like, and the way of knowing the ocean by human beings is fundamentally changed.
The constant-current power transmission cable system seabed observation network is widely applied to seabed observation application with high reliability requirements due to the advantages of strong robustness, high reliability, easy diagnosis of fault points and the like. However, almost all scientific instruments adopt constant voltage power supply, and due to the instability of a constant current transmission network, the existing constant current observation network (ACO) totally utilizes a balanced load to realize the balanced load and the constant total power consumption of the scientific instruments, so that constant voltage output is realized. This also results in inefficiency of the system.
Thus, patent document CN 107370144A proposes a load adaptive subsea observation constant current power supply system, which adjusts the total output power of the node by switching in/out the "DC/DC module" directly. However, this solution, in which the "DC/DC module" is directly switched out/in, has several drawbacks: when the DC/DC module is switched out (short-circuited), the input voltage of the other DC/DC modules rises instantly due to factors such as a constant current source, a power transmission submarine cable and the like; for example, if only two "DC/DC modules" are provided, the input voltage is 100V each, the submarine cable voltage is 200V, and if the second "DC/DC module" is cut out at this time, the 200V voltage of the original submarine cable will not drop instantly, but is added to the first "DC/DC module", so that the first "DC/DC module" bears twice its rated operating voltage, and the circuit may be damaged permanently.
Similarly, when the "DC/DC module" is switched in (short-circuited), the input voltage of the rest of the "DC/DC modules" may drop instantaneously due to the long submarine cable, which may cause the rest of the "DC/DC modules" to be under-voltage and not work, resulting in system breakdown. In the prior art, the energy loss is reduced by directly bypassing and resetting a module, but the voltage of other modules is disturbed in the direct bypassing process, even the other modules are permanently damaged; the entire system is powered down instantaneously during the direct reset process, which may cause system crash.
Disclosure of Invention
The invention provides a cable system seabed observation network constant-current power supply system with stably adjusted node total output power, which utilizes a current controllable load to slowly change the voltage of a DC/DC module, so that the DC/DC module is smoothly switched in/out, and the voltage of the other DC/DC modules has no obvious fluctuation.
Cable system seabed observation network constant current power supply system of node total output power stable adjustment includes:
a constant current power supply;
an external load;
a DC/DC module, DC/DC-1-DC/DC-n;
further comprising:
switches K connected in parallel to the DC/DC-1-DC/DC-n input sides, respectively11—Kn1；
The power balancer is respectively connected with the DC/DC-1-DC/DC-n output sides in parallel, can be automatically adjusted according to the load size, has an adjustable range of equivalent resistance value from a certain value to infinity, and has the equivalent resistance value fixed by an external signal;
switch K with one side connected to output voltage line and the other side connected to high voltage at output side of DC/DC-2-DC/DC-n22—Kn2；
The current flowing through the controllable load is adjustable and ranges from 0A to the maximum output current of the DC/DC module;
a switch K with one side connected with the input end of the current controllable load and the other side connected with the high voltage line at the output side of the DC/DC-1-DC/DC-n13—Kn3。
In order to reliably monitor and control each module, preferably, the working process of the cable system seabed observation network constant current power supply system is as follows:
when a certain DC/DC module is bypassed (i.e. the total output power is reduced), bypassing according to the forward direction from n > … >2> 1;
when a certain DC/DC module is reset (i.e. the total output power is increased), the resetting is performed in the order from 1>2> … > n. Therefore, each module can be monitored and controlled reliably, and at least one module can be ensured to work and supply power.
In order to ensure smooth transition of the bypass, it is preferable that the DC/DC-i module, i ═ 2,3,4, …, n, is bypassed, and the method specifically includes the following steps:
(1) initial state: k11—Ki1Closure, K(i+1)1—Kn1When the power balancer 1-i is opened, the power balancer 1-i works normally (i.e. the equivalent resistance value can be automatically regulated along with the load), the power balancer (i +1) -n equivalent resistance value is locked, K22—Ki2Closure, K(i+1)2—Kn2Opening, K13—Kn3Opening, wherein the current of the current controllable load is 0A;
(2) open switch Ki2Waiting for the power balancer i to adjust the DC/DC-i output voltage, after stabilizing, locking the equivalent resistance value of the power balancer i (i.e. the equivalent resistance value is not changed), Ki3Closing, adjusting the current of the current controllable load to slowly fall from 0A to the maximum output current of DC/DC-i, realizing the slow fall of the input and output voltage of DC/DC-i, Ki1Closed, DC/DC-i is completely bypassed, and the current of the current controllable load is adjusted to0A，Ki3And (4) opening. After the power balancer is locked, the power balancer is equivalent to a resistor with a fixed resistance value, the current flowing through the power balancer is slowly increased after the current controllable load is switched on, the current is equivalent to slowly reducing the load impedance, the input and output voltage of the module is correspondingly slowly reduced along with the load impedance, the input and output voltage is not suddenly reduced, and the smooth transition of a bypass process is ensured; switch Ki3The closing and opening processes are used for ensuring that the current controllable load is cut off when the current controllable load does not need to work, and the reliability and the service life of the current controllable load are ensured. In addition, even if the current of the current controllable load is set to 0A, a small amount of current flows, which affects the reliability of the entire system and needs to be switched off by a switch when not in operation.
In order to make the reset process smoothly transited, it is preferable that the DC/DC-1 module is bypassed, which specifically includes the following steps:
(1) initial state: k11Closure, K21—Kn1When the power balancer 1 is opened and normally operates, the equivalent resistance of the power balancer 2-n is locked, K22—Kn2Opening, K13—Kn3Opening, wherein the current of the current controllable load is 0A;
(2) locking the equivalent resistance of the power balancer 1, K13Closing, regulating the current of the current controllable load to slowly from 0A to the maximum output current of DC/DC-1, realizing the slow reduction of the input and output voltage of DC/DC-1, K11Closed, DC/DC-1 is completely bypassed, and the current of the load with controllable current is adjusted to be 0A, K13And (4) opening. The load impedance can be slowly increased, the input and output voltage of the module is correspondingly and slowly increased along with the load impedance, and the voltage is not suddenly increased, so that the smooth transition of the reset process is ensured. Switch Ki3The closing and opening processes work as above.
Preferably, the resetting of the DC/DC-i module, i ═ 2,3,4, …, n, specifically includes the following steps:
(1) initial state: k11—K(i-1)1Closure, Ki1—Kn1When the power balancer 1 (i-1) is opened, the power balancer i-n equivalent resistance is locked, K22—K(i-1)2Closure is provided，Ki2—Kn2Opening, K13—Kn3Opening, wherein the current of the current controllable load is 0A;
(2)Ki3closing, setting the current of the current controllable load as the maximum output current of DC/DC-i, and opening the switch Ki1Adjusting the current of the current controllable load to slowly reduce to 0A, canceling the locking of the power balancer i to enable the power balancer i to work normally, and closing Ki2Opening Ki3。
Preferably, the resetting the DC/DC-1 module specifically includes the following steps:
(1) initial state: k11—Kn1Closed, power balancer 1-n effective resistance locked, K22—Kn2Opening, K13—Kn3Opening, wherein the current of the current controllable load is 0A;
(2)K13closing, setting the current of the current controllable load as the maximum output current of DC/DC-1, and opening the switch K11Adjusting the current of the current controllable load to slowly reduce to 0A, canceling the locking of the power balancer i to enable the power balancer i to work normally, and turning on K13。
The invention has the beneficial effects that:
the cable system seabed observation network constant-current power supply system with stably adjusted node total output power can realize extremely reliable bypass reset of multi-module stacking in nodes of the constant-current observation network, can not cause disturbance or even damage to other modules due to voltage of other modules, ensures the energy utilization rate of the constant-current observation network, and also ensures the stability and reliability of the system.
Drawings
Fig. 1 is a schematic structural diagram of a cable system submarine observation network constant-current power supply system for stably adjusting total output power of nodes.
Detailed Description
In order to more specifically describe the present invention, the following detailed description is provided for the technical solution of the present invention with reference to the accompanying drawings and the specific embodiments.
As shown in fig. 1, the constant current power supply system of the cable system submarine observation network for stably adjusting the total output power of the node in this embodimentComprises the following steps: a constant current power supply; an external load; DC/DC module DC/DC-1-DC/DC-n; switch K11—Kn1(ii) a A power balancer; switch K22—Kn2(ii) a A current controllable load; switch K13—Kn3；
When a certain DC/DC module is bypassed (namely, the total output power is reduced), bypass is required to be carried out according to the sequence from n > … >2>1, and when a certain DC/DC module is reset (namely, the total output power is increased), reset is required to be carried out according to the sequence from 1>2> … > n, and the specific process is as follows:
the bypass procedure for the DC/DC-i (i ═ 2,3,4, …, n) module is as follows:
(1) initial state: k11—Ki1Closure, K(i+1)1—Kn1When the power balancer 1-i is opened, the power balancer 1-i works normally (i.e. the equivalent resistance value can be automatically regulated along with the load), the power balancer (i +1) -n equivalent resistance value is locked, K22—Ki2Closure, K(i+1)2—Kn2Opening, K13—Kn3And when the load is opened, the current of the current controllable load is 0A.
(2) Open switch Ki2(ii) a Waiting for the power balancer i to adjust the DC/DC-i output voltage; after the voltage is stabilized, the equivalent resistance value of the power balancer i is locked (namely the equivalent resistance value is not changed); ki3Closing; the current of the current controllable load is adjusted to slowly fall from 0A to the maximum output current of DC/DC-i, so that the input and output voltage of the DC/DC-i is slowly reduced; ki1Closing, and completely bypassing DC/DC-i; adjusting the current of the current controllable load to be 0A; ki3And (4) opening.
Bypassing the DC/DC-1 module is essentially the same except that there is no K12The specific process is as follows:
(1) initial state: k11Closure, K21—Kn1When the power balancer 1 is opened and normally operates, the equivalent resistance of the power balancer 2-n is locked, K22—Kn2Opening, K13—Kn3And when the load is opened, the current of the current controllable load is 0A.
(2) Locking the equivalent resistance value of the power balancer 1; k13Closing; regulating the currentThe current of the controllable load is slowly from 0A to the maximum output current of DC/DC-1, so that the slow reduction of the input and output voltage of the DC/DC-1 is realized; k11Closed, DC/DC-1 is completely bypassed; adjusting the current of the current controllable load to be 0A; k13And (4) opening.
The reset procedure for the DC/DC-i (i ═ 2,3,4, …, n) module is as follows:
(1) initial state: k11—K(i-1)1Closure, Ki1—Kn1When the power balancer 1 (i-1) is opened, the power balancer i-n equivalent resistance is locked, K22—K(i-1)2Closure, Ki2—Kn2Opening, K13—Kn3And (4) opening. The current of the current controllable load is 0A.
(2)Ki3Closing; setting the current of the current controllable load as the maximum output current of DC/DC-i; open switch Ki1(ii) a Adjusting the current of the current controllable load to slowly reduce to 0A; the power balancer i is unlocked to normally work; closed Ki2(ii) a Opening Ki3。
Resetting the DC/DC-1 module is essentially the same, except that there is no K12The specific process is as follows:
(2) initial state: k11—Kn1Closed, power balancer 1-n effective resistance locked, K22—Kn2Opening, K13—Kn3And (4) opening. The current of the current controllable load is 0A.
(2)K13Closing; setting the current of the current controllable load as the maximum output current of DC/DC-1; open switch K11(ii) a Adjusting the current of the current controllable load to slowly reduce to 0A; the power balancer i is unlocked to normally work; opening K13。
Claims (6)
1. Cable system seabed observation network constant current power supply system of node total output power stable adjustment includes:
a constant current power supply;
an external load;
a DC/DC module, DC/DC-1-DC/DC-n;
it is characterized by also comprising:
switches K connected in parallel to the DC/DC-1-DC/DC-n input sides, respectively11—Kn1；
The power balancer is respectively connected with the DC/DC-1-DC/DC-n output sides in parallel, can be automatically adjusted according to the size of the current controllable load, has an adjustable range of equivalent resistance value from a certain value to infinity, and can fix the equivalent resistance value by an external signal;
switch K with one side connected to output voltage line and the other side connected to high voltage at output side of DC/DC-2-DC/DC-n22—Kn2；
The current flowing through the controllable load is adjustable and ranges from 0A to the maximum output current of the DC/DC module;
a switch K with one side connected with the input end of the current controllable load and the other side connected with the high voltage line at the output side of the DC/DC-1-DC/DC-n13—Kn3。
2. The cable system seafloor observation network constant-current power supply system with stable node total output power regulation of claim 1, wherein the cable system seafloor observation network constant-current power supply system works as follows:
when a certain DC/DC module is bypassed, bypassing is performed according to the sequence from n > … >2> 1;
when a certain DC/DC module is reset, the resetting is performed in the order from 1>2> … > n.
3. The cable-based subsea observation network constant current power supply system with stable node total output power regulation according to claim 2, wherein a DC/DC-i module, i-2, 3,4, …, n, is bypassed, and the method specifically comprises the following steps:
(1) initial state: k11—Ki1Closure, K(i+1)1—Kn1Opening, normal operation of power balancer 1-i, locking of equivalent resistance of power balancer (i +1) -n, and K22—Ki2Closure, K(i+1)2—Kn2Opening, K13—Kn3Open, powerThe current of the current controllable load is 0A;
(2) open switch Ki2Waiting for the power balancer i to adjust the DC/DC-i output voltage, after stabilizing, locking the equivalent resistance value of the power balancer i, Ki3Closing, adjusting the current of the current controllable load to slowly fall from 0A to the maximum output current of DC/DC-i, realizing the slow fall of the input and output voltage of DC/DC-i, Ki1Closed, DC/DC-i is completely bypassed, and the current of the current controllable load is adjusted to be 0A, Ki3And (4) opening.
4. The cable-based seafloor observation network constant-current power supply system for stably adjusting total output power of nodes as claimed in claim 2, wherein the DC/DC-1 module is bypassed, and the method specifically comprises the following steps:
(1) initial state: k11Closure, K21—Kn1When the power balancer 1 is opened and normally operates, the equivalent resistance of the power balancer 2-n is locked, K22—Kn2Opening, K13—Kn3Opening, wherein the current of the current controllable load is 0A;
(2) locking the equivalent resistance of the power balancer 1, K13Closing, regulating the current of the current controllable load to slowly from 0A to the maximum output current of DC/DC-1, realizing the slow reduction of the input and output voltage of DC/DC-1, K11Closed, DC/DC-1 is completely bypassed, and the current of the load with controllable current is adjusted to be 0A, K13And (4) opening.
5. The cable-based subsea observation network constant-current power supply system with stable node total output power regulation according to claim 2, wherein the DC/DC-i module, i-2, 3,4, …, n, is reset, and the method specifically comprises the following steps:
(1) initial state: k11—K(i-1)1Closure, Ki1—Kn1When the power balancer 1 (i-1) is opened, the power balancer i-n equivalent resistance is locked, K22—K(i-1)2Closure, Ki2—Kn2Opening, K13—Kn3Opening, wherein the current of the current controllable load is 0A;
(2)Ki3closing, setting the current of the current controllable load as the maximum output current of DC/DC-i, and opening the switch Ki1Adjusting the current of the current controllable load to slowly reduce to 0A, canceling the locking of the power balancer i to enable the power balancer i to work normally, and closing Ki2Opening Ki3。
6. The cable system submarine observation network constant-current power supply system with stable node total output power regulation according to claim 2, wherein the resetting of the DC/DC-1 module specifically comprises the following steps:
(1) initial state: k11—Kn1Closed, power balancer 1-n equivalent resistance locked, K22—Kn2Opening, K13—Kn3Opening, wherein the current of the current controllable load is 0A;
(2)K13closing, setting the current of the current controllable load as the maximum output current of DC/DC-1, and opening the switch K11Adjusting the current of the current controllable load to slowly reduce to 0A, canceling the locking of the power balancer i to enable the power balancer i to work normally, and turning on K13。
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