CN107134808B - Automatic control system and control method for transformer group - Google Patents
Automatic control system and control method for transformer group Download PDFInfo
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- CN107134808B CN107134808B CN201710577851.6A CN201710577851A CN107134808B CN 107134808 B CN107134808 B CN 107134808B CN 201710577851 A CN201710577851 A CN 201710577851A CN 107134808 B CN107134808 B CN 107134808B
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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
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Abstract
The invention relates to an automatic control system and a control method for a transformer substation group, belonging to the field of automatic control systems for 10KV/0.4KV low-voltage distribution networks, and comprising a power supply bus and N sections of power supply lines, wherein the power supply bus is connected with two adjacent sections of power supply lines through a tie switch; the power supply bus on set up district main transformer, district main transformer side connects district crowd main control unit, sets up the district transformer on the power supply line respectively, district transformer side all is connected with the transformer controller, transformer controller and tie switch pass through wireless communication unit and connect district crowd main control unit. The invention has reasonable structural design, can regulate and control the number of the transformer stations to operate in real time, automatically network reorganizes the distribution network formed by transformer groups in a transformer area, optimizes the structure of the distribution network, improves the operation efficiency, reduces the light load loss and improves the safe operation capability of the distribution network.
Description
Technical Field
The invention relates to an automatic control system and a control method for a transformer substation group, and belongs to the field of automatic control systems for 10KV/0.4KV low-voltage distribution networks.
Background
The national power grid provides a plan for changing coal into electricity in the rural power grid in order to match the national indication of improving the environment and reducing haze, so that residents in the rural power grid are changed from original coal-fired heating into electricity-used heating. However, the coal-to-electricity planning increases 6.9KW for each household power supply based on the original power supply capacity, and further causes the power supply capacity of the transformer in the original distribution area to be insufficient, in order to overcome the above problems, a large number of transformers in the power supply area need to be increased, and the number of transformers in the power supply area is increased by several times, as shown in fig. 8. However, the newly added loads belong to seasonal loads, and in three seasons of spring, summer and autumn, the loads can be restored to the original load magnitude, so that the load rate of the transformer in the transformer area at different periods is changed greatly, the transformer in the transformer area is in light-load operation in most of the year, and the loss of the transformer in the transformer area is very large.
Disclosure of Invention
According to the defects in the prior art, the problems to be solved by the invention are as follows: the automatic control system and the automatic control method for the transformer substation group have the advantages that the structural design is reasonable, the number of the transformer substation operation units can be regulated and controlled in real time, automatic network recombination is carried out on a distribution network formed by transformer substation groups, the distribution network structure is optimized, the operation efficiency is improved, the light load loss is reduced, and the safe operation capability of the distribution network is improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the station transformer group automatic control system comprises a power supply bus and N sections of power supply lines, wherein the power supply bus is connected with two adjacent sections of power supply lines through a tie switch, and the two adjacent sections of power supply lines are connected through the tie switch; the power supply bus on set up district main transformer, district main transformer side connects district crowd main control unit, sets up the district transformer on the power supply line respectively, district transformer side all is connected with the transformer controller, transformer controller and tie switch pass through wireless communication unit and connect district crowd main control unit.
The station becomes crowd automatic control system can gather the load size in the crowd in real time, through the remote communication means, the operation number of station becomes is regulated and controlled in real time to the required station variable number operation of adaptation load, join in marriage the net to joining in marriage that transformer crowd of platform district constitutes and carry out automatic network reorganization, optimize and join in marriage net structure, improve the operating efficiency, reduce the underload loss, improve and join in marriage net safe operation ability, have stronger practicality.
Preferably, the transformer area group master controller comprises a voltage transformer and a current transformer which are connected with a power supply bus, the voltage transformer and the current transformer are connected with a signal input end of a microprocessor, a communication port of the microprocessor is connected with a human-computer interaction unit and a wireless communication unit which are composed of a display screen and keys, a control output end of the microprocessor is connected with a high-voltage circuit breaker and a low-voltage alternating current contactor, the high-voltage circuit breaker is used for controlling the access of a high-voltage input end of the transformer, and the low-voltage alternating current contactor is used for controlling a low-voltage output end of. The transformer substation group controller and the transformer area group master controller are installed at a transformer area main transformer, data of phase voltage, current, power and the like collected by the transformer substation controller and the interconnection switch can be received through the wireless communication unit, data synthesis and intelligent analysis and judgment are completed, operation or quit operation of the transformer area is controlled through the wireless communication unit, and interconnection of a power supply line is achieved through the interconnection switch installed in the power supply line.
Preferably, the transformer controller comprises a voltage transformer and a current transformer which are connected with a power supply line, the voltage transformer and the current transformer are connected with a signal input end of a microprocessor, a communication port of the microprocessor is connected with a human-computer interaction unit and a wireless communication unit, the human-computer interaction unit and the wireless communication unit are composed of a display screen and keys, a control output end of the microprocessor is connected with a high-voltage circuit breaker and a low-voltage alternating current contactor, the high-voltage circuit breaker is used for controlling the connection of a high-voltage input end of the transformer, and the low-voltage alternating current contactor. The load data of each phase of the transformer in the transformer area is collected and transmitted to the main controller of the transformer area group; and receiving an instruction of the main controller of the district group, and executing the operation or exit action of the transformer of the corresponding district.
Further preferably, the interconnection switch comprises a microprocessor, a communication port of the microprocessor is connected with the wireless communication unit, a control output end of the microprocessor is connected with a low-voltage alternating current contactor, the low-voltage alternating current contactor is used for controlling the access of a load of a power supply line, two sides of the low-voltage alternating current contactor are respectively provided with a voltage transformer I, a voltage transformer II, a current transformer I and a current transformer II, and the voltage transformer I, the voltage transformer II, the current transformer I and the current transformer II are all connected with the microprocessor. The receiving of the instructions of the main controller of the cell group is realized, and the split or parallel operation of two sections of three-phase four-wire power supply circuits is completed.
Further preferably, the microprocessor is of the type STM32F 103.
The control method of the station-to-station group automatic control system comprises the following steps:
1) the method comprises the steps that the voltage and the current of each phase of a power supply line are collected in real time through a voltage transformer and a current transformer of a transformer controller on the transformer side of a transformer area, the load of each phase is calculated, and the calculation result is sent to a main controller of a transformer area group through a wireless communication unit;
2) respectively acquiring phase voltages and currents of two sides of a low-voltage alternating current contactor of a power supply line interconnection switch through a voltage transformer I and a voltage transformer II of the interconnection switch and a current transformer I and a current transformer II of the interconnection switch, and transmitting acquired results to a transformer area group main controller through a wireless communication unit;
3) and the transformer area group master controller judges according to the received current and voltage signals sent by each phase load and the interconnection switch sent by the transformer controller, forms a control instruction according to a judgment result, sends the control instruction to the transformer controller or the interconnection switch through the wireless communication unit, and controls the operation or exit of the transformer area through the transformer controller or the interconnection switch.
The operation steps of the transformer in the transformer area are as follows:
1)1) the station area group master controller judges according to the received each phase load sent by the station transformer controller, if the station area group master controller does not work in an overload mode, the station area group master controller normally operates, and if the station area group master controller works in an overload mode, the step 2 is carried out;
2) when the transformer of the transformer area is overloaded to work, the transformer controller at one side of the transformer area sends information that the load reaches a critical value to the main controller of the transformer area group to request for splitting;
3) the method comprises the following steps that a platform area group master controller sends commissioning instructions to adjacent platform change controllers;
4) after the adjacent transformer controllers receive the instruction, the high-voltage circuit breakers and the low-voltage alternating-current contactors are closed, the adjacent transformer stations are put into operation, and the execution result is reported to the transformer station group master controller after the operation is finished;
5) and the transformer substation group master controller sends a disconnection instruction to the interconnection switch of the section, the low-voltage alternating-current contactor of the interconnection switch is disconnected, the disconnection is completed, the result is reported to the transformer substation group master controller, and the transformer substation group master controller sends disconnection completion information to the transformer substation controller to complete operation of the transformer substation.
The step of exiting the transformer in the transformer area is as follows:
1) the transformer controller collects the voltage and the current of each phase of the power supply line in real time through a voltage transformer and a current transformer, and calculates the load of each phase;
2) if the obtained load is in low-load work for 3 consecutive days, the station-to-station controller sends the obtained load information to the station group master controller through the wireless communication unit and sends an exit request to the station group master controller;
3) the station group main controller judges according to the received load condition, if the station group main controller can exit, the step 4) is executed;
4) sampling voltages on two sides of a low-voltage alternating current contactor through a voltage transformer I and a voltage transformer II of the section of the interconnection switch, acquiring three-phase voltage difference between buses at two ends, judging whether the voltage difference exceeds a given limit value in real time, acquiring current signals on two sides of the low-voltage alternating current contactor through the current transformer I and the current transformer II, judging whether the bus phase sequences at two ends are consistent, and if the voltage difference at two ends does not exceed the given limit value and the bus phase sequences at two ends are consistent, closing the low-voltage alternating current contactor of the interconnection switch by a station area group main controller to carry out bus connection; if the power loss of one section of the power supply lines at two ends is detected, the low-voltage alternating current contactor of the interconnection switch is directly closed to carry out bus connection, so that the parallel arrangement of the power supply lines is realized;
5) after the power supply lines are completed in parallel, an exit command is sent to the transformer controller through the transformer area group master controller, and the transformer controller controls the high-voltage circuit breaker and the low-voltage alternating-current contactor to be disconnected to complete exit of the transformer in the transformer area.
And if the current load of the transformer area main transformer or the transformer area exceeds 80% of the rated capacity of the transformer area main transformer or the transformer area main transformer, the transformer area main transformer or the transformer area main transformer needs to be put into operation.
And the transformer of the transformer area of the power supply line is lower than 50% of the rated power of the transformer area of the power supply line section for 3 days continuously, and the transformer of the transformer area needs to be quitted.
The invention has the beneficial effects that:
1. the automatic control system and the control method for the transformer station group can carry out distributed data acquisition, the transformer controllers and the interconnection switches are distributed in the transformer cluster of the whole transformer area, and the data acquisition can be carried out on each transformer and the interconnection switches, so that the data of the main controller of the transformer station group is complete, and an optimal control instruction can be formed.
2. The automatic control system and the control method for the transformer substation group can improve the robustness of a power supply network, and when one transformer fails, the transformer substation group can be automatically isolated from the power distribution network, so that other transformers supply power for loads, the power supply interruption caused by equipment failure is reduced, and the power supply safety is improved.
3. The station transformer group automatic control system and the control method have the advantages that the energy conservation and consumption reduction are remarkable, fewer transformers are put into operation when the load is lower, more transformers are put into operation when the load is heavier, the transformers are enabled to operate in an economic operation state with the load rate of 70%, and the loss of a power distribution network is greatly reduced.
4. The automatic control system and the control method for the transformer substation group have high reliability, and the interconnection switch is adopted to ensure that the voltage difference of two sections is subjected to bus-bar connection action within a safety range when two sections of power supply circuits are interconnected; and the transformer is withdrawn from operation, so that the high voltage and the low voltage are completely isolated from the power grid.
5. The automatic control system and the control method for the transformer substation group have high intelligent degree, can form accurate control instructions, have reasonable structural design and improve the operation efficiency.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a zone group host controller according to the present invention;
FIG. 3 is a schematic structural diagram of a station-to-station controller according to the present invention;
FIG. 4 is a schematic diagram of the interconnection switch of the present invention;
FIG. 5 is a schematic diagram of the connection of the zone group master controller, the station transformer controller or the tie switch according to the present invention;
FIG. 6 is a diagram of the first embodiment of the present invention;
FIG. 7 is a second embodiment of the present invention;
FIG. 8 is a schematic diagram of a prior art configuration;
wherein, 1, a power supply bus; 2. a power supply line; 3. a station change controller; 4. a transformer in the transformer area; 5. a tie switch; 6. a zone group master controller; 7. the transformer area main transformer.
Detailed Description
Embodiments of the invention are further described below with reference to the accompanying drawings:
as shown in fig. 1-7, the station transformer group automatic control system of the present invention includes a power supply bus 1 and N sections of power supply lines 2, the power supply bus 1 is connected with two adjacent sections of power supply lines 2 through a tie switch 5, and the two adjacent sections of power supply lines 2 are connected through the tie switch 5; power supply bus 1 on set up district main transformer 7, district main transformer 7 side connects district crowd main control unit 6, sets up district transformer 4 on the power supply line 1 respectively, district transformer 4 side all is connected with a transformer controller 3, a transformer controller 3 and interconnection switch 5 pass through wireless communication unit and connect district crowd main control unit 6.
As shown in fig. 2, the platform zone group master controller 6 includes a voltage transformer and a current transformer connected to the power supply bus 1, the voltage transformer and the current transformer are connected to a signal input end of the microprocessor, a communication port of the microprocessor is connected to a display screen, a man-machine interaction unit and a wireless communication unit formed by keys, a control output end of the microprocessor is connected to a high-voltage circuit breaker and a low-voltage ac contactor, the high-voltage circuit breaker is used for controlling the connection of a high-voltage input end of the transformer, the low-voltage ac contactor is used for controlling a low-voltage output end of the transformer, the connection of a load is realized, and the.
As shown in fig. 3, the transformer controller 3 includes a voltage transformer and a current transformer which are connected with the power supply line 2, the voltage transformer and the current transformer are connected with a signal input end of a microprocessor, a communication port of the microprocessor is connected with a display screen, a man-machine interaction unit and a wireless communication unit which are composed of keys, a control output end of the microprocessor is connected with a high-voltage circuit breaker and a low-voltage alternating current contactor, the high-voltage circuit breaker is used for controlling the high-voltage input end of the transformer to be connected, the low-voltage alternating current contactor is used for controlling the load connection of the transformer 4 in the transformer area.
As shown in fig. 4, interconnection switch 5 include microprocessor, microprocessor's communication port connects the wireless communication unit, microprocessor's control output end connects low voltage ac contactor, low voltage ac contactor is used for the access of control power supply line load, low voltage ac contactor both sides set up voltage transformer I and voltage transformer II, current transformer I and current transformer II respectively, voltage transformer I, voltage transformer II, current transformer I and current transformer II all connect microprocessor, microprocessor's model is STM32F 103.
The control method of the station-to-station group automatic control system comprises the following steps:
1) the voltage and the current of each phase of a power supply line are collected in real time through a voltage transformer and a current transformer of a transformer controller 3 on the transformer 4 side of the transformer area, the load of each phase is calculated, and the calculation result is sent to a transformer area group main controller 6 through a wireless communication unit;
2) respectively acquiring phase voltages and currents of two sides of a low-voltage alternating current contactor of a power supply line interconnection switch 5 through a voltage transformer I and a voltage transformer II of the interconnection switch 5 and a current transformer I and a current transformer II, and transmitting acquired results to a transformer area group main controller 6 through a wireless communication unit;
3) the station area group master controller 6 judges according to the received load of each phase sent by the station transformer controller 3 and the current and voltage signals sent by the interconnection switch 5, forms a control instruction according to the judgment result, sends the control instruction to the station transformer controller 3 or the interconnection switch 5 through the wireless communication unit, and controls the operation or exit of the station area transformer 4 through the station transformer controller 3 or the interconnection switch 5.
The step of commissioning the transformer 4 in the transformer area is as follows:
1) the station group master controller 6 judges according to the received load of each phase sent by the station change controller 3, if the load does not exceed 80% of the rated capacity, the station group master controller operates normally, and if the load exceeds 80% of the rated capacity, the station group master controller enters step 2);
2) when the transformer 4 of the transformer area works in an overrun mode, the transformer controller 3 on one side of the transformer area sends load reaching critical value information to the main controller 6 of the transformer area group to request for splitting;
3) the station group master controller 6 sends a commissioning instruction to the adjacent station change controller 3;
4) after receiving the instruction, the adjacent transformer controllers 3 close the high-voltage circuit breakers and the low-voltage alternating-current contactors, and the adjacent transformer 4 is put into operation, and then the execution result is reported to the transformer group master controller 6;
5) the transformer area group master controller 6 sends a splitting instruction to the interconnection switch 5 of the section, the low-voltage alternating-current contactor of the interconnection switch 5 is disconnected, the result is reported to the transformer area group master controller 6 after splitting is completed, and the transformer area group master controller 6 sends splitting completion information to the transformer area controller 3 to complete operation of the transformer area 4.
The step of exiting the transformer 4 of the transformer area is as follows:
1) the transformer controller 3 collects the voltage and the current of each phase of the power supply line in real time through a voltage transformer and a current transformer, and calculates the load of each phase;
2) if the obtained load is lower than 50% of the rated power of the transformer of the power supply line section area for 3 days continuously, the transformer controller 3 sends the obtained load information to the area group master controller 6 through the wireless communication unit and sends an exit request to the area group master controller 6 at the same time;
3) the station group master controller 6 judges according to the received load condition, if the station group master controller can quit, the step 4 is executed;
4) sampling voltages on two sides of a low-voltage alternating current contactor through a voltage transformer I and a voltage transformer II of the section of the interconnection switch 5, acquiring three-phase voltage difference between buses at two ends, judging whether the voltage difference exceeds a given limit value in real time, acquiring current signals on two sides of the low-voltage alternating current contactor through the current transformer I and the current transformer II, judging whether the phase sequences of the buses at two ends are consistent, and if the voltage difference at two ends does not exceed the given limit value and the phase sequences of the buses at two ends are consistent, closing the low-voltage alternating current contactor of the interconnection switch 5 by a transformer area group main controller 6 to carry out bus interconnection; if the power loss of one section of the power supply lines at two ends is detected, the low-voltage alternating current contactor of the interconnection switch 5 is directly closed to carry out bus connection, so that the parallel arrangement of the power supply lines is realized;
5) after the power supply lines are completed in parallel, the transformer area group master controller 6 sends an exit command to the transformer controller 3, and the transformer controller 3 controls the high-voltage circuit breaker and the low-voltage alternating-current contactor to be disconnected to complete the exit of the transformer 4.
As shown in fig. 6, the embodiment of the throw-in and throw-out:
description of procedure for exit from station # 2:
initial state: the transformer is put into operation entirely.
Exit condition # 2: the maximum power in the II section day is less than 50% of the rated power of the 2# transformer (the value can be set) for three consecutive days.
(1) The 2# station-to-station controller sends an exit request to the 1# station group master controller.
(2) Because the section II is in a correlation relationship with the section I, III, the 1# transformer area group master controller judges that the 2# transformer area can exit and the section II and the section III are in parallel according to the current loads of the section I, the section II and the section III and the highest load of three days; the zone group master controller sends a parallel command to K23.
(3) After the K23 is completed in parallel, the station group master controller feeds back a parallel successful response.
(4) And the district group master controller sends an exit instruction to the No. 2, and the No. 2 switches off the high-voltage circuit breaker and the low-voltage alternating-current contactor in sequence.
(5) And the station group master controller sends the parallel information of the II and III sections to the 3#, and the II and III sections complete parallel network reconstruction of power supply changed from the 3 #.
4# Process description of Transformer investment:
initial state: the 4# transformer area is shut down, the IV section and the III section are parallel, and the 3# transformer supplies power.
4# input conditions: the current load of the 3# transformer exceeds 80% (a settable value) of the rated capacity of the 3# transformer.
(1) The 3# station controller sends information of the load reaching the critical value to the 1# station group master controller to request for disconnection.
(2) And the 1# station group master controller sends a commissioning instruction to the 4# station change controller.
(3) And after receiving the instruction, the 4# transformer controller closes the 10KV high-voltage circuit breaker and the low-voltage alternating-current contactor in sequence, and reports the execution result to the 1# transformer area group master controller.
(4) The 1# cell group master controller issues a disconnection command to K34.
(5) After completion of the disconnection, K34 transmits a completion response to the 1# cell group master controller.
(6) And the 1# station area group master controller sends the splitting completion information to the 3# station change controller, and the III and IV sections complete splitting.
As shown in fig. 7, the fault recovery process and service embodiment:
(1) and (3) fault recovery: the scene is that the IV section and the V section are supplied with power by 4#, and the 4# trip protection IV section and the V section lose power.
The K14 interconnection switch detects the IV section power failure, the K14 interconnection switch reports to the station group master controller, the station group master controller sends paralleling to the K14 interconnection switch, the K14 interconnection switch closes paralleling, and the IV section restores power supply. And the district group master controller sends commissioning to the 4# transformer, the 4# transformer is put into operation and runs in parallel, and the district group master controller sends a disconnection request to the K14 interconnection switch to perform disconnection. The V-section recovery process is the same as above.
(2) And (3) overhauling: the scene is that the second section and the third section are parallelly supplied with power by the No. 2, and the No. 2 maintenance is required to be stopped. The maintenance mode can be divided into II section power failure maintenance and II section non-power-off maintenance.
The transformer station group master controller sends operation to a 3# transformer station, the 3# transformer station is operated, the transformer station group master controller sends operation stop to a 2# transformer station, the 2# transformer station is off-line and stops operation, if the II section is in power failure for maintenance, the transformer station group master controller directly maintains, if the II section is in power failure for maintenance, the transformer station group master controller sends disconnection to a K23 interconnection switch, and the K23 interconnection switch is disconnected for maintenance.
The invention has reasonable structural design, can regulate and control the number of the transformer stations to operate in real time, automatically network reorganizes the distribution network formed by transformer groups in a transformer area, optimizes the distribution network structure, improves the operation efficiency, reduces the light load loss, improves the safe operation capability of the distribution network, and has stronger practicability.
The present invention is not limited to the above-described embodiments, and variations, modifications, additions and substitutions which are within the spirit of the invention and the scope of the invention may be made by those of ordinary skill in the art are also within the scope of the invention.
Claims (7)
1. A platform becomes crowd automatic control system which characterized in that: the power supply system comprises a power supply bus (1) and N sections of power supply lines (2), wherein the power supply bus (1) is connected with two adjacent sections of power supply lines (2) through an interconnection switch (5), and the two adjacent sections of power supply lines (2) are connected through the interconnection switch (5);
a platform main transformer (7) is arranged on the power supply bus (1), the side of the platform main transformer (7) is connected with a platform group main controller (6), platform transformers (4) are respectively arranged on the power supply line (1), the sides of the platform transformers (4) are connected with platform transformer controllers (3), and the platform transformer controllers (3) and the interconnection switch (5) are connected with the platform group main controller (6) through a wireless communication unit;
the control method of the station-to-station group automatic control system comprises the following steps:
1) the voltage and the current of each phase of a power supply line are collected in real time through a voltage transformer and a current transformer of a transformer controller (3) on the transformer (4) side of the transformer area, the load of each phase is calculated, and the calculation result is sent to a transformer area group main controller (6) through a wireless communication unit;
2) the voltage transformer I and the voltage transformer II of the interconnection switch (5) and the current transformer I and the current transformer II are used for respectively collecting phase voltages and currents of two sides of a low-voltage alternating current contactor of the interconnection switch (5) of a power supply line, and the collected results are sent to a transformer area group main controller (6) through a wireless communication unit;
3) the transformer area group master controller (6) judges according to the received current and voltage signals sent by each phase load and the interconnection switch (5) sent by the transformer controller (3), forms a control instruction according to the judgment result, sends the control instruction to the transformer controller (3) and the interconnection switch (5) through the wireless communication unit, and controls the operation or exit of the transformer (4) of the transformer area through the transformer controller (3) and the interconnection switch (5);
the operation of the transformer (4) in the transformer area comprises the following steps:
1) the station group master controller (6) judges according to the received loads of all phases sent by the station transformer controller (3), if the loads are not overloaded, the station group master controller operates normally, and if the loads are overloaded, the step 2 is carried out;
2) when the transformer (4) of the transformer area is overloaded, the transformer controller (3) at one side of the transformer area sends load critical value information to the main controller (6) of the transformer area group to request for splitting;
3) the station group master controller (6) sends commissioning instructions to the adjacent station change controllers (3);
4) after the adjacent transformer controllers (3) receive the instruction, the high-voltage circuit breakers and the low-voltage alternating-current contactors are closed, the adjacent transformer (4) in the transformer area are put into operation, and the execution result is reported to the transformer area group master controller (6) after the operation is finished;
5) the transformer substation disconnection method comprises the steps that a transformer substation group master controller (6) sends a disconnection command to a connection switch (5) of the section, a low-voltage alternating-current contactor of the connection switch (5) is disconnected, a result is reported to the transformer substation group master controller (6) after disconnection is completed, and the transformer substation group master controller (6) sends disconnection completion information to a transformer substation controller (3) to complete operation of a transformer substation (4);
the step of exiting the transformer (4) of the transformer area is as follows:
1) the transformer controller (3) collects the voltage and the current of each phase of the power supply line in real time through a voltage transformer and a current transformer, and calculates the load of each phase;
2) if the obtained load is in low-load work for 3 consecutive days, the station-to-station controller (3) sends the obtained load information to the station group master controller (6) through the wireless communication unit and sends an exit request to the station group master controller (6) at the same time;
3) the station group master controller (6) judges according to the received load condition, if the judgment can be exited, the step 4 is executed;
4) sampling voltages on two sides of a low-voltage alternating current contactor through a voltage transformer I and a voltage transformer II of the section of the interconnection switch (5), acquiring three-phase voltage difference between buses at two ends, judging whether the voltage difference exceeds a given limit value in real time, acquiring current signals on two sides of the low-voltage alternating current contactor through the current transformer I and the current transformer II, judging whether the bus phase sequences at two ends are consistent, and if the voltage difference at two ends does not exceed the given limit value and the bus phase sequences at two ends are consistent, closing the low-voltage alternating current contactor of the interconnection switch (5) by a station area group master controller (6) to carry out bus interconnection; if the power loss of one section of the power supply lines at two ends is detected, the low-voltage alternating current contactor of the interconnection switch (5) is directly closed to carry out bus connection, so that the parallel arrangement of the power supply lines is realized;
5) after the power supply lines are completed in parallel, a quit command is sent to the transformer controller (3) through the transformer area group master controller (6), and the transformer controller (3) controls the high-voltage circuit breaker and the low-voltage alternating-current contactor to be disconnected to complete quitting of the transformer (4) in the transformer area.
2. The station-to-station group automatic control system according to claim 1, characterized in that: the transformer area group master controller (6) comprises a voltage transformer and a current transformer which are connected with a power supply bus (1), the voltage transformer and the current transformer are connected with a signal input end of a microprocessor, a communication port of the microprocessor is connected with a man-machine interaction unit and a wireless communication unit which are formed by a display screen and keys, a control output end of the microprocessor is connected with a high-voltage circuit breaker and a low-voltage alternating current contactor, the high-voltage circuit breaker is used for controlling the connection of a high-voltage input end of a transformer, and the low-voltage alternating current contactor is used for controlling a low-voltage output end of.
3. The station-to-station group automatic control system according to claim 1, characterized in that: the transformer substation controller (3) comprises a voltage transformer and a current transformer which are connected with a power supply line (2), the voltage transformer and the current transformer are connected with a signal input end of a microprocessor, a communication port of the microprocessor is connected with a human-computer interaction unit and a wireless communication unit, the human-computer interaction unit and the wireless communication unit are formed by a display screen and keys, a control output end of the microprocessor is connected with a high-voltage circuit breaker and a low-voltage alternating current contactor, the high-voltage circuit breaker is used for controlling the access of a high-voltage input end of a transformer, and the low-voltage alternating current.
4. The station-to-station group automatic control system according to claim 1, characterized in that: interconnection switch (5) include microprocessor, microprocessor's communication port connects the wireless communication unit, microprocessor's control output connects low voltage ac contactor, low voltage ac contactor is used for the access of control power supply line load, low voltage ac contactor both sides set up voltage transformer I and voltage transformer II, current transformer I and current transformer II respectively, voltage transformer I, voltage transformer II, current transformer I and current transformer II all connect microprocessor.
5. The station-to-station group automatic control system according to claim 2, 3 or 4, characterized in that: the type of the microprocessor is STM32F 103.
6. The control method of a station-to-station group automatic control system according to claim 1, characterized in that: and the current load of the transformer area main transformer (7) or the transformer area (4) exceeds 80% of the rated capacity of the transformer area main transformer or the transformer area (4), and the transformer area (4) needs to be put into operation.
7. The control method of a station-to-station group automatic control system according to claim 1, characterized in that: and the transformer (4) of the transformer area of the power supply line is lower than 50% of the rated power of the transformer area of the power supply line section for 3 days continuously, and the transformer (4) of the transformer area needs to be withdrawn.
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| CN111293782A (en) * | 2018-12-07 | 2020-06-16 | 国网内蒙古东部电力有限公司经济技术研究院 | Intelligent power distribution system for power distribution station |
| CN110739694A (en) * | 2019-09-10 | 2020-01-31 | 国电南瑞科技股份有限公司 | distribution network management and control method and system based on distribution area interconnection |
| CN110854856A (en) * | 2019-12-17 | 2020-02-28 | 国网江苏省电力有限公司泰州供电分公司 | Modularized distribution network device and method convenient to guarantee |
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