A system and method for preventing mismatch between backup and automatic switching devices at different voltage levels

Abstract

The present invention discloses a system and method for preventing mismatches in backup automatic starters at different voltage levels. The system comprises a high-voltage backup automatic starter and a low-voltage backup automatic starter. The high-voltage backup automatic starter comprises a timing mode conversion module and a communication transmission module, while the low-voltage backup automatic starter comprises a communication reception module and a timing mode adjustment module. Through information exchange between backup automatic starters at different voltage levels, synchronization of the timing modes of the program timers of the backup automatic starters at multiple different voltage levels is achieved. This solves the technical problem of some backup automatic starters preemptively operating after a system failure due to differences in the timing modes of the program timers of the backup automatic starters at multiple different voltage levels. This avoids confusion in the order of backup automatic starter operations after a system failure, achieves a multi-level backup automatic starter redundant configuration for load recovery, and improves system power supply reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems and automation thereof, and in particular to a system and method for preventing mismatch between backup and automatic switching at different voltage levels. Background Art

[0002] During the operation of the substation, in order to prevent the substation from losing power due to system failure, a backup power supply automatic start-up device (backup automatic start-up device) is configured to improve the system power supply reliability. The substation's different voltage level busbars will be equipped with backup automatic start-up devices. When a system failure occurs, the backup automatic start-up devices of different voltage levels will be activated. If the timing methods of the backup automatic start-up devices of different voltage levels are not synchronized, the backup automatic start-up devices of some voltage levels may be activated first.

[0003] In order to avoid this situation, the general solution is to coordinate through the time setting, the action time of the high voltage level standby automatic start-up is set shorter than the action time of the low voltage level standby automatic start-up, and the high voltage level standby automatic start-up takes priority. If the high voltage level standby automatic start-up is successful, the high voltage level standby automatic start-up bus and the low voltage level standby automatic start-up bus will both resume power supply, and the low voltage level standby automatic start-up will start and return. If the high voltage level standby automatic start-up fails, the low voltage level standby automatic start-up will continue to operate and restore power supply to the low voltage level standby automatic start-up bus.

[0004] The problem with the above solution is that since the timers of the standby automatic start-up devices at different voltage levels have different timing methods, in order to avoid the low-voltage level standby automatic start-up device from taking action first, the time difference in the settings of the standby automatic start-up devices at different voltage levels will be relatively large. When a fault occurs in the line connecting the buses at different voltage levels, the action time of the low-voltage level standby automatic start-up device will be extended, which is not conducive to the rapid restoration of power supply to the load and reduces the power supply reliability. Summary of the Invention

[0005] The present invention provides a system and method for preventing mismatch of standby automatic start-up switches at different voltage levels, realizing synchronization of the timing modes of standby automatic start-up switches at multiple different voltage levels, and solving the technical problem that, due to the different timing modes of program timers of standby automatic start-up switches at multiple different voltage levels, some standby automatic start-ups may act first after a system failure occurs.

[0006] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0007] A system for preventing mismatch of standby automatic starters at different voltage levels includes: a high-voltage level standby automatic starter and a low-voltage level standby automatic starter. The high-voltage level standby automatic starter includes a high-voltage timing mode conversion module and a communication sending module, and the low-voltage level standby automatic starter includes a communication receiving module and a low-voltage timing mode adjustment module.

[0008] Preferably, the high-voltage timing mode conversion module of the high-voltage level standby automatic start-up is connected to the communication sending module, the high-voltage timing mode conversion module converts the program timer timing mode into a switch signal with a state of 0 or 1, and transmits the state switch signal to the communication sending module, the communication sending module receives the timing mode state switch signal transmitted by the timing mode conversion module, and sends this signal to the communication carrier; the communication receiving module of the low-voltage level standby automatic start-up is connected to the low-voltage timing mode adjustment module, the communication receiving module receives the timing mode state switch signal from the communication carrier, and transmits this signal to the timing mode adjustment module, and the low-voltage timing mode adjustment module adjusts the program timer timing mode according to the received timing mode state switch signal.

[0009] Preferably, the communication carrier for information exchange between the high-voltage level standby automatic start-up and the low-voltage level standby automatic start-up can be a station control layer network or a conventional hard connection point.

[0010] Preferably, the program timer timing mode refers to the timing mode of the trip timer when the starting conditions are not met within the time before tripping after the standby automatic start-up, which is divided into two modes: keeping or clearing.

[0011] Preferably, when the timing mode flag received by the low-voltage level standby automatic start-up is 0, the program timer timing mode is cleared if the starting conditions are not met within the time before tripping after the standby automatic start-up is started, and the timing starts from zero when the starting conditions are met again.

[0012] Preferably, when the timing mode flag received by the low-voltage level standby automatic start-up is 1, the program timer timing mode will be maintained if the starting conditions are not met within the time before tripping after the standby automatic start-up is started, and will continue timing when the starting conditions are met again.

[0013] Preferably, the method comprises the following steps:

[0014] S101: The high voltage level standby automatic switch generates a timing mode flag according to the timing mode of the program timer;

[0015] S102: The high voltage level standby automatic start-up sends a timing mode flag to the communication carrier;

[0016] S103: The low voltage level standby automatic start-up receives a timing mode flag sent by the high voltage level standby automatic start-up from the communication carrier;

[0017] S104: The low voltage level standby automatic switch adjusts the timing mode of the program timer according to the received timing mode flag.

[0018] After adopting the above scheme, the beneficial effect of the present invention is that the standby automatic start-up devices of different voltage levels can realize the synchronization of the timing modes of the standby automatic start-up timers of multiple different voltage levels through information interaction, solves the technical problem that the standby automatic start-up devices of two different voltage levels take the initiative to act after a system failure due to the different timing modes of the program timers, avoids the confusion of the standby automatic start-up action order after a system failure, realizes the redundant configuration of multi-level standby automatic start-up devices for load restoration, and improves the power supply reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of an application of a system and method for preventing mismatch between standby automatic switching at different voltage levels according to the present invention;

[0020] Figure 2 This is a flow chart of a system and method for preventing mismatch between standby automatic switching devices at different voltage levels according to the present invention;

[0021] Figure 3 This is a schematic diagram of the system operation mode after the system fails and the automatic switching action occurs before the existing optimization;

[0022] Figure 4 The present invention is a system and method for preventing mismatch between standby automatic switching at different voltage levels and a schematic diagram of the system operation mode after a fault occurs and the standby automatic switching is actuated. DETAILED DESCRIPTION

[0023] The present invention provides a system and method for preventing mismatches between backup and automatic starters at different voltage levels. The system includes a high-voltage backup and automatic starter module and a low-voltage backup and automatic starter module. The high-voltage backup and automatic starter module includes a timing mode conversion module and a communication transmission module, while the low-voltage backup and automatic starter module includes a communication reception module and a timing mode adjustment module. Through information exchange between backup and automatic starters at different voltage levels, the timing modes of the program timers of the backup and automatic starters at multiple different voltage levels are synchronized, thus resolving the technical problem of some backup and automatic starters being preemptively activated after a system failure due to differences in the timing modes of the program timers of the backup and automatic starters at multiple different voltage levels.

[0024] The embodiments described below are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] As shown in the figure, both the high-voltage level standby automatic starter and the low-voltage level standby automatic starter are single-mother segmented main connections, and both the high-voltage level standby automatic starter and the low-voltage level standby automatic starter are operated separately. Line 1 supplies the high-voltage level standby automatic starter I bus and the low-voltage level standby automatic starter III bus, and line 2 supplies the high-voltage level standby automatic starter II bus and the low-voltage level standby automatic starter IV bus.

[0027] The high-voltage level standby automatic start-up device and the low-voltage level standby automatic start-up device are each equipped with a standby automatic start-up device. The timing mode of the high-voltage level standby automatic start-up device is reset, and the timing mode of the low-voltage level standby automatic start-up device is maintained. The timing mode conversion module of the high-voltage level standby automatic start-up device is connected to the communication sending module, and the communication receiving module of the low-voltage level standby automatic start-up device is connected to the timing mode adjustment module.

[0028] The voltage-level backup automatic transfer timing mode is reset, while the low-voltage-level backup automatic transfer timing mode remains. A single-phase permanent fault occurs on Line 1 and the circuit breaker is reclosed. The system operates in this mode after the backup automatic transfer is activated. Both the high-voltage-level backup automatic transfer and the low-voltage-level backup automatic transfer are activated, eliminating the redundant coordination between the high-voltage-level backup automatic transfer and the low-voltage-level backup automatic transfer.

[0029] The high-voltage automatic start-up device is equipped with a timer-cleared automatic start-up device, while the low-voltage automatic start-up device is equipped with a timer-maintained automatic start-up device. The timing conversion module of the high-voltage automatic start-up device converts the reset timing mode within the program into a switch signal with a state of 0, and then sends the switch signal to the communication network through the communication sending module. The low-voltage automatic start-up device receives the switch signal with the high-voltage automatic start-up timing mode flag of 0 from the communication network through the communication receiving module. The timing mode adjustment module adjusts the timing mode within the program from maintain to reset based on the received timing mode flag, synchronizing it with the timing mode of the high-voltage automatic start-up device. When a single-phase permanent fault occurs in line 1, the line protection trips and the busbar loses pressure. The timers of the high-voltage automatic switch-on and low-voltage automatic switch-on start timing. After the line is reclosed, the voltage of the non-fault phase is restored and the starting conditions are not met. The timers of the high-voltage automatic switch-on and low-voltage automatic switch-on are suspended. Since the reclosing is due to the fault, the line protection accelerates the line switch to open, and the busbar loses pressure again. The timers of the high-voltage automatic switch-on and low-voltage automatic switch-on continue timing. The setting time of the high-voltage level standby automatic starter is short, and the high-voltage level standby automatic starter takes priority. After the 1DL switch is tripped, the 3DL switch is closed to restore the power supply of the high-voltage level standby automatic starter I bus and the low-voltage level standby automatic starter III bus. The low-voltage level standby automatic starter starts and returns because the busbar pressure is restored, thus solving the technical problem of the low-voltage level standby automatic starter taking priority action, avoiding the confusion of the standby automatic starter action sequence, realizing the redundant configuration of the high-voltage level standby automatic starter and the low-voltage level standby automatic starter when the load is restored to power supply, and improving the system power supply reliability.

[0030] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes the same replacement or change according to the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A system capable of preventing mismatch between automatic switching devices at different voltage levels, characterized in that: include: High-voltage level standby automatic start-up and low-voltage level standby automatic start-up, the high-voltage level standby automatic start-up contains a high-voltage timing mode conversion module and a communication sending module, the low-voltage level standby automatic start-up contains a communication receiving module and a low-voltage timing mode adjustment module, the high-voltage timing mode conversion module of the high-voltage level standby automatic start-up is connected to the communication sending module, the high-voltage timing mode conversion module converts the program timer timing mode into a switch signal with a state of 0 or 1, and transmits the state switch signal to the communication sending module, the communication sending module receives the timing mode state switch signal transmitted by the timing mode conversion module, and sends this signal to the communication carrier; the low-voltage level standby automatic start-up is connected to the communication receiving module of the low-voltage level standby automatic start-up, the communication receiving module receives the timing mode state switch signal from the communication carrier, and transmits this signal to the timing mode adjustment module, the low-voltage timing mode adjustment module adjusts the program timer timing mode according to the received timing mode state switch signal.

2. The system for preventing mismatch of automatic switching of backup devices at different voltage levels according to claim 1, characterized in that: The communication carrier for information exchange between the high-voltage level standby automatic start-up and the low-voltage level standby automatic start-up can be a station control layer network or a conventional hard connection.

3. The system for preventing mismatch of automatic switching of backup devices at different voltage levels according to claim 2, characterized in that: The program timer timing mode refers to the timing mode of the trip timer if the starting conditions are not met within the time before tripping after the standby automatic start-up. It is divided into two modes: hold or clear.

4. The system for preventing mismatch of automatic switching of backup devices at different voltage levels according to claim 3, characterized in that: When the timing mode flag received by the low-voltage level standby automatic start-up is 0, the program timer timing mode will be cleared if the starting conditions are not met within the time before tripping after the standby automatic start-up is started, and the timing will start from zero when the starting conditions are met again.

5. The system for preventing mismatch of automatic switching of backup devices at different voltage levels according to claim 3, characterized in that: When the timing mode flag received by the low-voltage level standby automatic start-up is 1, the program timer timing mode will be maintained if the starting conditions are not met within the time before tripping after the standby automatic start-up is started, and will continue timing when the starting conditions are met again.

6. A method for preventing mismatch between backup switches at different voltage levels, the method being applied to the system according to any one of claims 1 to 5, characterized in that: The following steps are involved: S101: The high voltage level standby automatic switch generates a timing mode flag according to the timing mode of the program timer; S102: The high voltage level standby automatic start-up sends a timing mode flag to the communication carrier; S103: The low voltage level standby automatic start-up receives a timing mode flag sent by the high voltage level standby automatic start-up from the communication carrier; S104: The low voltage level standby automatic switch adjusts the timing mode of the program timer according to the received timing mode flag.

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