A test method for switching between main and standby sets of flexible DC valve control system

Abstract

This application discloses a test method for switching between the main and backup systems of a flexible DC valve control system. The test method is applied to a flexible DC valve control system and includes: starting the flexible DC valve control full-link test equipment and the flexible DC valve control system; detecting fiber optic cable disconnection; if either of the two polar control boxes is disconnected from the main control box; detecting both fiber optic cables disconnected; if either main control box is disconnected from its matching pulse distribution box; or if the power supply to either main control box is disconnected, triggering a main / backup switchover; if both fiber optic cables are disconnected, the power supply to one main control box is disconnected, and the other main control box is disconnected from the polar control box, triggering a trip; and testing the circulating current suppression function of the main and backup systems of the valve control system using a preset number of main / backup switchover commands to obtain the test results. This application solves the technical problem of the lack of prior art testing technology for the switching performance between the main and backup systems of a valve control system, which makes it impossible to determine the accuracy and effectiveness of the communication function design between the main and backup systems.

Description

Technical Field

[0001] This application relates to the field of flexible DC valve control system technology, and in particular to a test method for switching between main and backup systems in a flexible DC valve control system. Background Technology

[0002] With the development of high-voltage, high-power power electronic devices, the improvement of the modularization, unitization and intelligence of converters, and the enhancement of control and modulation strategies, flexible DC transmission will play a greater role in the power system.

[0003] Flexible DC valve control is the "brain" of a flexible DC converter valve, and its proper operation directly affects the safe and stable operation of the valve. Therefore, during the development of flexible DC converter valves, simulation tests are usually conducted on its control and protection system to verify its control and protection functions. To comprehensively verify the valve control system, a full-link structure is generally adopted, meaning the test system includes a valve control system consistent with the actual engineering system.

[0004] However, existing technologies lack testing techniques for the switching performance between the main and backup valve control systems, which makes it impossible to determine the accuracy and effectiveness of the data interaction communication function design carried by the communication optical fiber between the main and backup systems. Summary of the Invention

[0005] This application provides a test method for switching between the main and backup systems of a flexible DC valve control system, which solves the technical problem that the lack of prior art test technology for the switching performance between the main and backup systems of a valve control system makes it impossible to determine the accuracy and effectiveness of the communication function design between the main and backup systems.

[0006] In view of this, this application provides a test method for switching between main and backup systems in a flexible DC valve-controlled system. The test method is applied to a flexible DC valve-controlled system, which includes: a pole control system, a valve control system, and a power module.

[0007] The polar control system includes a first polar control box and a second polar control box;

[0008] The valve control system includes a main control box and a pulse distribution box, and two corresponding sets of the main control box and the pulse distribution box are provided.

[0009] The two main control boxes are connected via a first optical fiber and a second optical fiber communication channel.

[0010] The power module includes odd-numbered modules and even-numbered modules, and executes instructions and generates voltage signals through simulation.

[0011] The first polar control box is connected to one set of the main control boxes, and the second polar control box is connected to another set of the main control boxes;

[0012] The main control box is redundantly communicated with the pulse distribution box through multiple pairs of redundant optical fibers;

[0013] One set of the pulse distribution box is communicatively connected to the odd-numbered modules via a pair of optical fibers, and the other set of the pulse distribution box is communicatively connected to the even-numbered modules via a pair of optical fibers.

[0014] The odd-numbered module and the even-numbered module are connected by a first cross-communication optical fiber and a second cross-communication optical fiber.

[0015] The test method includes:

[0016] In response to the start command, the flexible DC valve control system and the flexible DC valve control full-link test equipment are started, and the power module is simulated through a real-time simulator to unlock the rated power operating state of the power module;

[0017] If the first channel optical fiber is detected to be disconnected, and either the first polar control box or the second polar control box is disconnected from the matched main control box, the valve control system is triggered to perform a main / standby switching operation.

[0018] If the first optical fiber and the second optical fiber are both disconnected, and if any one of the main control boxes loses communication connection with the matched pulse distribution box, the valve control system is triggered to perform a master-slave switching operation.

[0019] If the power supply to any one of the main control boxes is disconnected, and both the first and second optical fiber channels are detected to be disconnected, the valve control system will be triggered to perform a main / standby switching operation.

[0020] If the power supply to one set of the main control boxes is disconnected and the other set of the main control boxes is disconnected from the matching polar control box, the system will trip and report a failure to switch from main to standby.

[0021] The circulating flow suppression function of the main and backup sets of the valve control system was tested by using a preset number of main / backup switching commands, and the test results were obtained.

[0022] Preferably, the first cross-communication optical fiber is a communication optical fiber output from the even-numbered module to the odd-numbered module;

[0023] The second cross-communication fiber is the communication fiber output from the odd-numbered module to the even-numbered module.

[0024] Preferably, the polar control system is used to generate a modulated wave signal and transmit it to the valve control system;

[0025] The valve control system is used to generate a trigger control signal and send it to the power module;

[0026] The power module is simulated using an FPGA real-time simulator to execute the trigger control signal, generate a voltage signal, and send the voltage signal to the secondary equipment system.

[0027] Preferably, the first polar control box and the second polar control box are connected by a pair of optical fibers;

[0028] Both the odd-numbered modules and the even-numbered modules include flexible DC valve power modules with multiple AU bridge arms.

[0029] Preferably, the step of triggering the valve control system to perform a master / standby switchover operation when the first channel optical fiber is detected to be disconnected, if either the first polar control box or the second polar control box is disconnected from the matched master control box, further includes:

[0030] If the first channel optical fiber is detected to be disconnected, and the connection between the first polar control box and the second polar control box and the main control box is completely disconnected, the system will be triggered to trip and the two valve control systems will be reported to request tripping.

[0031] Preferably, if, upon detecting that both the first and second optical fiber channels are disconnected, the power supply to one set of the main control boxes is disconnected, and the other set of the main control boxes is disconnected from the matching polar control box, then the system trips and reports a failure in the main / standby switchover. This further includes:

[0032] In response to the system restart command, the valve control system is reset, all disconnected optical fibers are restored to the connected state, and the power module is restored to the rated power operating state after unlocking.

[0033] Preferably, the test of the circulating current suppression function of the main and backup sets of the valve control system by using a preset number of main / backup switching commands to obtain test results includes:

[0034] If a master / slave switchover command of a preset number of times is detected, then the first channel fiber and the second channel fiber are disconnected simultaneously.

[0035] If the preset number of master / standby switching commands are detected again, the circulating current suppression function of the standby valve control box will be deactivated based on the exit command, and the connection between the first channel optical fiber and the second channel optical fiber will be restored.

[0036] The operating status of the circulating flow suppression function of the main and backup systems in the valve control system is monitored to obtain test results, which include the standby function being deactivated and the main function being activated.

[0037] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0038] This application provides a test method for switching between main and backup systems in a flexible DC valve-controlled system. The test method is applied to a flexible DC valve-controlled system, which includes: a pole control system, a valve control system, and power modules. The pole control system includes a first pole control box and a second pole control box. The valve control system includes a main control box and a pulse distribution box, with two corresponding sets of main control boxes and pulse distribution boxes. The two main control boxes are connected via a first optical fiber and a second optical fiber. The power modules include odd-numbered modules and even-numbered modules, and execute commands and generate voltage signals through simulation. The first pole control box is connected to one set of main control boxes, and the second pole control box is connected to the other set of main control boxes. The main control boxes are redundantly connected to the pulse distribution boxes via multiple pairs of redundant optical fibers. One set of pulse distribution boxes is connected to the odd-numbered modules via a pair of optical fibers, and the other set of pulse distribution boxes is connected to the even-numbered modules via a pair of optical fibers. The odd-numbered modules and even-numbered modules are connected via a first cross-communication optical fiber and a second cross-communication optical fiber. The test method includes: responding to a start command, starting the flexible DC valve-controlled system and... The flexible DC valve-controlled full-link test equipment simulates the power module using a real-time simulator, unlocking the rated power operating state of the power module. If the first optical fiber is detected to be disconnected, and either the first or second polar control box is disconnected from its matched main control box, the valve control system is triggered to perform a master-slave switching operation. If both the first and second optical fibers are detected to be disconnected, and either main control box is disconnected from its matched pulse distribution box, the valve control system is triggered to perform a master-slave switching operation. If both the first and second optical fibers are detected to be disconnected, and the power supply to either main control box is disconnected, the valve control system is triggered to perform a master-slave switching operation. If both the first and second optical fibers are detected to be disconnected, and the power supply to one main control box is disconnected, and the other main control box is disconnected from its matched polar control box, the system trips and reports a master-slave switching failure. The circulating current suppression function of the valve control system's master and standby sets is tested using a preset number of master-slave switching commands, and the test results are obtained.

[0039] The main / backup switching test method for flexible DC valve control systems provided in this application offers a relatively reliable and effective test scheme. The test operation process is designed according to the specific structure of the flexible DC valve control system. During this process, the two main control boxes of the valve control system are connected via a first-channel optical fiber and a second-channel optical fiber. The test mainly involves detecting and analyzing the continuity of this pair of optical fibers, and performing specific main / backup switching operation tests in conjunction with the continuity of other optical fibers. This process can comprehensively and systematically realize the main / backup switching performance test in the valve control system, providing reliable technical support for the design of communication functions between the main and backup systems. Therefore, this application solves the technical problem of the lack of prior art testing technology for the switching performance between the main and backup systems of valve control systems, which leads to the inability to determine the accuracy and effectiveness of the communication function design between the main and backup systems. Attached Figure Description

[0040] Figure 1 This is a flowchart illustrating a test method for switching between the main and backup systems of a flexible DC valve control system, provided in an embodiment of this application. Detailed Implementation

[0041] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0042] For easier understanding, please refer to Figure 1 This application provides an embodiment of a test method for switching between main and backup systems in a flexible DC valve-controlled system. The test method is applied to a flexible DC valve-controlled system, which includes a pole control system, a valve control system, and a power module.

[0043] The polar control system includes a first polar control box and a second polar control box;

[0044] The valve control system includes a main control box and a pulse distribution box, with two corresponding sets of the main control box and the pulse distribution box;

[0045] The two main control boxes are connected via a first-channel optical fiber and a second-channel optical fiber for communication.

[0046] The power module includes odd-numbered modules and even-numbered modules, and executes instructions and generates voltage signals through simulation.

[0047] The first polar control box is connected to a set of main control boxes, and the second polar control box is connected to another set of main control boxes;

[0048] The main control box is redundantly communicated with the pulse distribution box through multiple pairs of redundant optical fibers;

[0049] One pulse distribution box is connected to the odd-numbered modules via a pair of optical fibers, and the other pulse distribution box is connected to the even-numbered modules via a pair of optical fibers.

[0050] The odd-numbered modules and even-numbered modules are connected via a first cross-communication optical fiber and a second cross-communication optical fiber.

[0051] Furthermore, the first cross-communication optical fiber is a communication optical fiber that outputs from the even-numbered modules to the odd-numbered modules;

[0052] The second cross-communication fiber is the communication fiber that outputs from the odd-numbered module to the even-numbered module.

[0053] Furthermore, the polar control system is used to generate a modulated wave signal and transmit it to the valve control system;

[0054] The valve control system is used to generate trigger control signals and send them to the power module;

[0055] The power module uses an FPGA real-time simulator for simulation operation, which is used to execute trigger control signals, generate voltage signals, and send the voltage signals to the secondary equipment system.

[0056] Furthermore, the first polar control box and the second polar control box are connected by a pair of optical fibers;

[0057] Both odd-numbered and even-numbered modules include flexible DC valve power modules with multiple AU bridge arms.

[0058] It should be noted that, Figure 1 This is a schematic diagram of the overall architecture of the flexible DC valve control system in this application embodiment. The system's polarity control cabinet includes two redundant polarity control boxes A and B, namely the first polarity control box and the second polarity control box. The main control cabinet in the flexible DC valve control system includes two redundant main control boxes A and B, which jointly control and protect the flexible DC converter valve. The two main control boxes A and B are connected one-to-one with the two polarity control boxes in the upper-level polarity control system via communication optical fibers a and b, respectively, to receive the modulation wave signals sent by the polarity control cabinet. After processing by the main control cabinet, trigger control signals can be generated. Furthermore, the two main control boxes A and B are connected to the pulse distribution box of any bridge arm by four pairs of redundant independent communication optical fibers, i.e. Figure 1 The fiber optic cables are I, II, III, VI and V, VI, VII, VIII. The pulse distribution cabinet contains two pulse distribution boxes. Pulse distribution box #1 is fixedly connected to all odd-numbered power modules in the AU bridge arm, and pulse distribution box #2 is fixedly connected to all even-numbered power modules in the AU bridge arm.

[0059] The polar control system generates a modulation signal, which is transmitted to the valve control system. Based on this signal, the valve control system generates a trigger control signal, which is then distributed to each power module by a pulse distribution box. The power modules simulated using a real-time simulator can execute the trigger control signal and generate a voltage signal. The real-time simulator can be an FPGA simulator, an RTDS simulator, or an RT-LAB simulator; the specific choice depends on the actual situation and is not limited here, but only used as an example. The voltage signal generated on the primary equipment side is then sent back to the secondary equipment side, i.e., the polar control and valve control systems, to update the control commands. This cycle repeats, maintaining stable system operation.

[0060] Under normal circumstances, either the A or B main control boxes in the valve control system can be selected as the primary unit, with the other as a backup. During operation, the primary unit sends control and protection signals to control and protect the flexible DC converter valve; signals from the backup unit cannot be executed at this time. If the primary unit malfunctions, such as a failure of the main control cabinet itself, interruption of the communication fiber optic cable for receiving modulation waves from the upper-level polar control system, or the complete interruption of all four pairs of communication fibers between the main control box and the pulse distribution box; or if a primary / backup switchover command is received from the operator, the primary unit's on-duty status must be switched to backup, while the backup unit's on-duty status is switched to primary.

[0061] The two main control boxes, A and B, are redundant and have identical hardware configurations and software functions. Two pairs of independent, redundant communication optical fibers are installed between the two main control boxes. Figure 1 The fiber optic cables in Channel 1 and Channel 2 correspond to the first and second channel optical fibers in the embodiment, respectively. If only one pair of the two redundant communication optical fibers is broken, only an alarm will be triggered, and the remaining pair can continue to complete the mutual data transmission. If both pairs are broken, the data transmission between the A and B main control boxes of the valve control system will be completely interrupted.

[0062] It can be observed that these two pairs of optical fibers enable data transmission between the A and B main control boxes of the valve control system. The types of data transmitted include: the valve control cabinet's own duty status signals (main / standby), and system self-test signals. System self-test signals include, but are not limited to, VBC-OK, and signals indicating a fault in the flexible DC valve control main control cabinet. Specifically, the VBC-OK signal will change from a valid "1" to an invalid "0". Main control cabinet faults include its own inability to operate, interruption of the communication fiber optic cable receiving the modulation wave from the upper-level polar control system, and the complete interruption of all four pairs of communication optical fibers between the main control box and the pulse distribution box.

[0063] Furthermore, the enabling signal for circulating current suppression does not follow between the two main control boxes A and B. The duty status signals of the valve control panel cabinets themselves, which are redundant between the two main control boxes A and B, namely the primary / standby set and the system self-test signal (VBC-OK), are crucial to the two tripping logics of the valve control: VBC-not OK request tripping between the two valve control main control panels and valve control main control panel switching failure request tripping.

[0064] The basic principles of the two tripping logics are as follows:

[0065] Two valve control main control panels VBC-not OK request tripping: Under the premise that the two redundant main control boxes A and B can still communicate normally, if the main valve control main control panel detects that its own valve control VBC is not OK, and at the same time receives the other valve control's VBC not OK sent through the transmission fiber between A and B, and the duration t of VBC-not OK in both main control boxes A and B exceeds the set time Tset1, then the main valve control main control panel output reports "VBC-not OK request tripping for both valve control systems A and B". After receiving the report, the upper-level polar controller trips and shuts down the system.

[0066] Valve control main control panel switching failure request trip: If the main set valve control system detects that the valve control VBC of this set is not OK, and at the same time the duty signal of this set continues to be the main set, and the duration t of both occurrences exceeds the set time Tset2, then the main set valve control system output will report "valve control system main standby switching failure request trip". After receiving the report, the upper-level polar controller will trip and shut down the system.

[0067] Furthermore, the communication reliability between adjacent paired power modules of any bridge arm and the valve control system is doubled through the first and second cross-communication optical fibers between them. Taking AU2N-1 and AU2N as an example, if there is no cross-communication optical fiber between AU2N-1 and AU2N, once the direct uplink and downlink communication optical fiber between the module and the valve control system is interrupted, the power module will not be able to receive the information sent by the valve control system, and the valve control system will not be able to receive the status sent by the power module. The power module will be bypassed and taken out of operation. However, AU2N-1 and AU2N adopt a cross-communication design. Once the direct uplink and downlink communication optical fiber between the power module and the valve control system is interrupted, the power module can still receive the trigger control command information of this module sent by the valve control system through the adjacent paired power module. The valve control system can also receive the status of this module sent by this module through the adjacent paired power module. The module can still maintain normal operation and not be bypassed.

[0068] The test methods include:

[0069] In response to the start command, the flexible DC valve control system and the flexible DC valve control full-link test equipment are started. The power module is simulated through a real-time simulator to unlock the rated power operating state of the power module.

[0070] If the first optical fiber is detected to be disconnected, and either the first polar control box or the second polar control box is disconnected from the matched main control box, the valve control system is triggered to perform a main / standby switching operation.

[0071] If the first and second optical fibers are both detected to be disconnected, and if any main control box loses its communication connection with the matched pulse distribution box, the valve control system will be triggered to perform a main / standby switching operation.

[0072] If the power supply to either the first or second optical fiber is disconnected, the valve control system will be triggered to perform a master-slave switching operation if the power supply to either main control box is disconnected.

[0073] If the power supply to one main control box is disconnected and the other main control box is disconnected from the matching polar control box when both the first and second optical fiber channels are detected to be disconnected, the system will trip and report a failure to switch from main to standby.

[0074] The circulating flow suppression function of the main and backup sets of the valve control system was tested by using a preset number of master / backup switching commands, and the test results were obtained.

[0075] Furthermore, if a disconnection is detected in the first optical fiber channel, and either the first or second polar control box is disconnected from the matched main control box, the valve control system is triggered to perform a master / standby switching operation, which also includes:

[0076] If the first optical fiber is detected to be disconnected, and the connection between the first polar control box and the second polar control box and the main control box is completely disconnected, the system will be tripped, and the two valve control systems will be reported to request tripping.

[0077] Furthermore, if both the first and second fiber optic channels are detected to be disconnected, and if the power supply to one main control box is disconnected, and the other main control box is disconnected from its matching polar control box, then the system trips and reports a failure to switch over from primary to backup. This is followed by:

[0078] In response to the system restart command, the valve control system is reset, all disconnected optical fibers are restored to the connected state, and the power module is restored to the rated power operating state after unlocking.

[0079] Furthermore, the circulating current suppression function of the main and standby valve control systems was tested using a preset number of main / standby switching commands, and the test results were obtained, including:

[0080] If a master / slave switchover command with a preset number of cycles is detected, then both the first and second fiber optic channels will be disconnected simultaneously.

[0081] If the preset number of master / standby switching commands are detected again, the circulating current suppression function of the standby valve control box will be deactivated based on the exit command, and the connection between the first and second optical fiber channels will be restored.

[0082] The operating status of the circulating flow suppression function of the main and backup valve control system is monitored, and the test results are obtained. The test results include the shutdown of the backup function and the activation of the main function.

[0083] It should be noted that, in response to the start command, the flexible DC valve control system and the flexible DC valve control full-link test equipment are started, including the power module simulated by the real-time simulator. By simulating the power module through the real-time simulator, the power module can be made to reach the rated power operating state after unlocking before the test begins, ensuring that the simulated power module can normally execute the trigger control commands transmitted by the secondary equipment.

[0084] First, test the communication function of the second optical fiber. If the first optical fiber is detected to be disconnected, and if at the same time the connection between the first polar control box and any of the corresponding matching main control boxes in the second polar control box is also detected to be disconnected, for example, if the optical fiber a between the first polar control box A and the corresponding main control box A is disconnected, then the valve control system will be triggered to perform a master-slave switchover operation. Specifically, the valve control main control panel of set A will report VBC not OK, and the valve control system should switch to B master and A standby. Similarly, if the optical fiber b between the second polar control box B and the corresponding main control box B is disconnected, the valve control main control panel of set B will report VBC not OK, and the valve control will switch to A master and B standby.

[0085] If the first fiber optic cable is disconnected, the connection between both polar control boxes and the main control box will be completely broken (i.e., both fiber optic a and fiber optic b are disconnected). In this case, the valve control system will report that both the main and backup systems are not working and request a trip, but will not report a switching failure and request a trip. Then the system will trip. After the above test is completed, the disconnected optical fibers need to be restored to the connected state, then the system needs to be restarted, the valve control system reset, and the system needs to be operated again to the rated power operating state after unlocking.

[0086] Then, if both fiber optic channels are simultaneously disconnected, the continuity between the main control box and the pulse distribution box needs to be checked. If any main control box disconnects its communication connection with its corresponding matching pulse distribution box; for example, disconnecting all connections between main control box A and the AU bridge arm pulse distribution cabinet (i.e., fibers I, II, III, and VI), the valve control system's master / slave switching operation is triggered. In this case, valve control main control panel A reports VBC not OK, and valve control switches to B as master and A as backup. If all connections between main control box B and the AU bridge arm pulse distribution cabinet are disconnected, the situation is similar, and the details will not be elaborated further.

[0087] In addition, if the power supply to either of the two fiber optic channels is disconnected, the valve control system will also need to be switched to standby mode if the power supply to either main control box is disconnected. For example, if the power supply to valve control main control box A is cut off, valve control main control panel A will report VBC not OK, and valve control will switch to main mode B and standby mode A. If the power supply to valve control main control box B is cut off, valve control main control panel B will report VBC not OK, and valve control will switch to main mode A and standby mode B.

[0088] Furthermore, even with both fiber optic channels disconnected, if the power supply to one main control box is disconnected and the other main control box is disconnected from its matching polar control box, the system will trip and report a failure to switch from primary to backup. For example, if the power supply to main control box A is disconnected, and the downlink input fiber b between main control box B and the second polar control box B is disconnected, the valve control system of set B will report a failure and request a switchover. If the switchover fails, it will report a switchover failure and request a trip, after which the system will trip. During this process, the valve control system of set B will not report a failure to switch from primary to backup and request a trip. After the test with both fiber optic channels disconnected is completed, the system needs to be restarted, the valve control reset, all disconnected fibers restored to the connected state, and the power modules restored to their rated power operating state after unlocking, ensuring that subsequent test operations start from the initialization state.

[0089] After completing the above tests, if a preset number of master / standby switchover commands are detected (this command is usually sent by the operator), the preset number of commands can be set according to the actual situation, for example, 2 times. If two master / standby switchover commands are detected, the system needs to perform two master / standby switchover operations. Then, the two fiber optic channels can be disconnected to cut off the communication connection between the two master control systems. The master / standby switchover can be performed again in the same way, again with the preset number of commands. Based on the exit command, the circulating current suppression function of the standby valve control system can be deactivated, and the connection between the first and second fiber optic channels can be restored. At this point, the master / standby function status should be checked; the circulating current suppression function of the standby valve control system should remain deactivated, while the circulating current suppression function of the master valve control system should be activated. After the test is completed, two more master / standby switchover operations can be performed to reset and adjust the system.

[0090] The main / backup switching test method for flexible DC valve control systems provided in this application offers a relatively reliable and effective test scheme. The test operation process is designed according to the specific structure of the flexible DC valve control system. During this process, the two main control boxes of the valve control system are connected via a first-channel optical fiber and a second-channel optical fiber. The test mainly involves detecting and analyzing the continuity of this pair of optical fibers, and performing specific main / backup switching operation tests in conjunction with the continuity of other optical fibers. This process can comprehensively and systematically realize the main / backup switching performance test in the valve control system, providing reliable technical support for the design of communication functions between the main and backup systems. Therefore, this application can solve the technical problem of the lack of prior art testing technology for the switching performance between the main and backup systems of valve control systems, which leads to the inability to determine the accuracy and effectiveness of the communication function design between the main and backup systems.

[0091] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0092] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0093] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0094] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for executing all or part of the steps of the methods described in the various embodiments of this application through a computer device (which may be a personal computer, server, or network device, etc.). The aforementioned storage medium includes: USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media capable of storing program code.

[0095] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A test method for switching between main and backup systems in a flexible DC valve control system, characterized in that, The test method is applied to a flexible DC valve-controlled system, which includes: a pole control system, a valve control system, and a power module; The polar control system includes a first polar control box and a second polar control box; The valve control system includes a main control box and a pulse distribution box, and two corresponding sets of the main control box and the pulse distribution box are provided. The two main control boxes are connected via a first optical fiber and a second optical fiber communication channel. The power module includes odd-numbered modules and even-numbered modules, and executes instructions and generates voltage signals through simulation. The first polar control box is connected to one set of the main control boxes, and the second polar control box is connected to another set of the main control boxes; The first polar control box and the second polar control box are connected by a pair of optical fibers; Both the odd-numbered modules and the even-numbered modules include flexible DC valve power modules with multiple AU bridge arms; The main control box is redundantly communicated with the pulse distribution box through multiple pairs of redundant optical fibers; One set of the pulse distribution box is communicatively connected to the odd-numbered modules via a pair of optical fibers, and the other set of the pulse distribution box is communicatively connected to the even-numbered modules via a pair of optical fibers. The odd-numbered module and the even-numbered module are connected by a first cross-communication optical fiber and a second cross-communication optical fiber. The test method includes: In response to the start command, the flexible DC valve control system and the flexible DC valve control full-link test equipment are started, and the power module is simulated through a real-time simulator to unlock the rated power operating state of the power module; If the first channel optical fiber is detected to be disconnected, and either the first polar control box or the second polar control box is disconnected from the matched main control box, the valve control system is triggered to perform a main / standby switching operation. If the first optical fiber and the second optical fiber are both disconnected, and if any one of the main control boxes loses communication connection with the matched pulse distribution box, the valve control system is triggered to perform a master-slave switching operation. If the power supply to any one of the main control boxes is disconnected, and both the first and second optical fiber channels are detected to be disconnected, the valve control system will be triggered to perform a main / standby switching operation. If the power supply to one set of the main control boxes is disconnected and the other set of the main control boxes is disconnected from the matching polar control box, the system will trip and report a failure to switch from main to standby. The circulating flow suppression function of the main and backup sets of the valve control system was tested by using a preset number of main / backup switching commands, and the test results were obtained.

2. The test method for switching between main and backup systems in a flexible DC valve control system according to claim 1, characterized in that, The first cross-communication optical fiber is the communication optical fiber output from the even-numbered module to the odd-numbered module; The second cross-communication fiber is the communication fiber output from the odd-numbered module to the even-numbered module.

3. The test method for switching between main and backup systems in a flexible DC valve control system according to claim 1, characterized in that, The polar control system is used to generate a modulated wave signal and transmit it to the valve control system; The valve control system is used to generate a trigger control signal and send it to the power module; The power module is simulated using an FPGA real-time simulator to execute the trigger control signal, generate a voltage signal, and send the voltage signal to the secondary equipment system.

4. The test method for switching between main and backup systems in a flexible DC valve control system according to claim 1, characterized in that, The step of triggering a master / slave switch operation in the valve control system when the first channel optical fiber is detected to be disconnected, if either the first polar control box or the second polar control box is disconnected from the matched master control box, further includes: If the first channel optical fiber is detected to be disconnected, and the connection between the first polar control box and the second polar control box and the main control box is completely disconnected, the system will be triggered to trip and the two valve control systems will be reported to request tripping.

5. The test method for switching between main and backup systems in a flexible DC valve control system according to claim 1, characterized in that, If, upon detecting that both the first and second optical fiber channels are disconnected, the power supply to one set of the main control boxes is disconnected, and the other set of the main control boxes is disconnected from its matching polar control box, then the system trips and reports a failure in the main / standby switchover. This is followed by: In response to the system restart command, the valve control system is reset, all disconnected optical fibers are restored to the connected state, and the power module is restored to the rated power operating state after unlocking.

6. The test method for switching between main and backup systems in a flexible DC valve control system according to claim 1, characterized in that, The circulating current suppression function of the valve control system's primary and backup sets is tested using a preset number of primary / backup switching commands, and the test results are obtained, including: If a master / slave switchover command of a preset number of times is detected, then the first channel fiber and the second channel fiber are disconnected simultaneously. If the preset number of master / standby switching commands are detected again, the circulating current suppression function of the standby valve control box will be deactivated based on the exit command, and the connection between the first channel optical fiber and the second channel optical fiber will be restored. The operating status of the circulating flow suppression function of the main and backup systems in the valve control system is monitored to obtain test results, which include the standby function being deactivated and the main function being activated.

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