Test methods, apparatus, and equipment for the effectiveness of DC valve-controlled bridge arm protection function in offshore wind-driven medium-frequency transmission systems.

Abstract

This application relates to a testing method, apparatus, and equipment for the effectiveness of the DC valve-controlled bridge arm protection function in a marine wind-driven medium-frequency power transmission system. The method includes acquiring a test topology diagram of the connection between a DC converter valve and the DC valve-controlled system under test, as well as the rated power of the DC converter valve; constructing a test platform based on the test topology diagram and controlling the operation of the test platform according to the rated power to obtain the rated parameters of the bridge arm in the DC converter valve; acquiring first test parameters, second test parameters, and third test parameters; controlling the operation of the test platform according to the first test parameters, second test parameters, and third test parameters respectively to obtain first operating data, second operating data, and third operating data of the DC valve-controlled system under test; and determining whether the effectiveness of the DC valve-controlled bridge arm protection function of the marine wind-driven medium-frequency power transmission system under test has passed the test based on the first operating data, second operating data, and third operating data, thereby achieving the testing of the effectiveness of the DC valve-controlled bridge arm protection function of the marine wind-driven medium-frequency power transmission system under test.

Description

Technical Field

[0001] This application relates to the field of fault data processing technology for power transmission lines, and in particular to a test method, apparatus and equipment for the effectiveness of DC valve-controlled bridge arm protection function in a marine wind medium-frequency power transmission system. Background Technology

[0002] In the offshore wind-driven medium-frequency power transmission system, each flexible DC converter valve corresponds to a flexible DC valve control system, which is responsible for the control and protection of the DC converter valve. Each flexible DC converter valve includes multiple bridge arms, and the effectiveness of the protection function of each flexible DC valve control system needs to be verified before it is put into engineering application.

[0003] Therefore, there is an urgent need for a test method to verify the effectiveness of the arm overcurrent instantaneous trip protection function and / or arm current rise rate protection function in the flexible DC valve control system when the measured value of the arm current of any arm of the flexible DC converter valve is abnormal and / or the measured value of the arm current rise rate is abnormal. Summary of the Invention

[0004] This application provides a test method, apparatus, and equipment for the effectiveness of the protection function of a DC valve-controlled bridge arm in a marine wind medium-frequency transmission system, which solves the technical problem that the prior art lacks a method for testing the effectiveness of the protection function in a flexible DC valve-controlled system.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] On the one hand, a test method for the effectiveness of the DC valve-controlled bridge arm protection function in an offshore wind-driven medium-frequency transmission system is provided, including the following steps:

[0007] A test topology diagram of the connection between the DC converter valve and the DC valve control system under test, as well as the rated power of the DC converter valve, are obtained. A test platform is constructed based on the test topology diagram, and the test platform is controlled to operate according to the rated power to obtain the rated parameters of the bridge arm in the DC converter valve. The DC valve control system under test includes a primary main control panel and a backup main control panel connected to the DC converter valve and redundant with each other. Both the primary main control panel and the backup main control panel include the same and redundant first protection module, second protection module, and third protection module.

[0008] Obtain the first test parameter, control the operation of the test platform according to the first test parameter, and obtain the first operating data of the DC valve control system under test;

[0009] Obtain the second test parameter, control the operation of the test platform according to the second test parameter, and obtain the second operating data of the DC valve control system under test;

[0010] Obtain the third test parameter, control the operation of the test platform according to the third test parameter, and obtain the third operating data of the DC valve control system under test;

[0011] Based on whether the first operating data, the second operating data, and the third operating data respectively meet the corresponding first judgment condition, the second judgment condition, and the third judgment condition, it is determined whether the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency transmission system under test has passed the test.

[0012] Preferably, the first operating data of the DC valve control system under test obtained by controlling the operation of the test platform according to the first test parameters includes:

[0013] Based on the first protection return setting and the first action setting of the first protection module of the backup main control screen in the first test parameters, the test platform is controlled to operate, and the first operating information of the backup main control screen is obtained.

[0014] If the DC valve control system under test is determined to be operating normally based on the first operating information, then the test platform is controlled to operate based on the second protection return setting and the second action setting of the second protection module of the backup main control panel in the first test parameters, thereby obtaining the second operating information of the backup main control panel;

[0015] If the DC valve control system under test is determined to be operating normally based on the second operating information, then the protection return setpoints and action setpoints of the first protection module and the second protection module in the backup main control panel are restored, and the test platform is controlled to operate based on the fourth protection return setpoint and the fourth action setpoint of the first protection module of the main control panel in the first test parameters, thereby obtaining the third operating information of the main control panel;

[0016] Based on the third operating information, it is determined that the DC valve control system under test is operating normally. Then, based on the fifth protection return setting and the fifth action setting of the second protection module of the main control panel in the first test parameters, the test platform is controlled to operate, and the fourth operating information of the main control panel is obtained.

[0017] If the DC valve control system under test is determined to be locked out and tripped based on the fourth operating information, the protection return setpoint and action setpoint of the first protection module and the second protection module in the main control panel are restored, the DC valve control system under test is controlled to reset, and the test platform is controlled to operate according to the rated power to obtain the fifth operating information of the bridge arm in the DC converter valve.

[0018] The first operating data includes the first operating information, the second operating information, the third operating information, the fourth operating information, and the fifth operating information; the first protection return setting is less than the return threshold, and the first action setting is less than the rated parameter; the second protection return setting is less than the return threshold, and the second action setting is less than the rated parameter; the fourth protection return setting is less than the return threshold, and the fourth action setting is less than the rated parameter; the fifth protection return setting is less than the return threshold, and the fifth action setting is less than the rated parameter.

[0019] Preferably, the first judgment condition includes: if the first operating information is that the first protection module of the backup main control panel is locked, and the second and third protection modules are not locked, and the backup main control panel does not output a lockout trip signal, then the DC valve control system under test is operating normally; if the second operating information is that the second protection module of the backup main control panel is locked and the backup main control panel does not output a lockout trip signal, then the DC valve control system under test is operating normally; if the third operating information is that the first protection module of the main control panel is locked, and the second and third protection modules are not locked, then the DC valve control system under test is operating normally. If none of the protection modules are locked and the main control panel does not output a lockout trip signal, then the DC valve control system under test is operating normally. If the fourth operating information indicates that the second protection module of the main control panel is locked and the main control panel outputs a lockout trip signal, then the DC valve control system under test is locked out and tripped. If the fifth operating information indicates that the arm current is equal to the rated current of the arm in the rated parameters or that the rate of increase of the arm current is equal to the rate of increase of the rated current in the rated parameters, then the first, second, and third protection modules of the main control panel and the backup control panel are all operating normally.

[0020] Preferably, if the effectiveness of the overcurrent instantaneous trip protection function of the bridge arm in the DC valve-controlled system under test is being tested, the second operating data of the DC valve-controlled system under test obtained by controlling the test platform according to the second test parameters includes:

[0021] The test platform is controlled to operate according to the sixth protection return setting and the sixth action setting of the third protection module of the main control screen in the second test parameters, so as to obtain the sixth operation information of the main control screen;

[0022] If the DC valve control system under test is determined to be operating normally based on the sixth operating information, then the test platform is controlled to operate according to the power disconnect command of the second protection module of the main control panel in the second test parameters, and the seventh operating information of the main control panel is obtained.

[0023] If the DC valve control system under test is determined to be locked out based on the seventh operating information, then the backup main control panel is switched to the new main control panel according to the fault request switching command of the seventh operating information. The protection return setting and action setting of the third protection module in the main control panel before the switch are restored, and the power supply of the second protection module in the main control panel before the switch is restored. The DC valve control system under test is reset, and the test platform is controlled to run according to the rated power to obtain the eighth operating information of the bridge arm in the DC converter valve.

[0024] or,

[0025] If the effectiveness of the current rise rate protection function of the bridge arm in the DC valve-controlled system under test is to be tested, the second operating data of the DC valve-controlled system under test obtained by controlling the test platform according to the second test parameters includes:

[0026] The test platform is controlled to operate according to the fifth protection return setting and the fifth action setting of the second protection module of the main control screen in the second test parameters, so as to obtain the ninth operation information of the main control screen;

[0027] If the DC valve control system under test is determined to be operating normally based on the ninth operating information, then the test platform is controlled to operate according to the power disconnect command of the first protection module of the main control panel in the second test parameters, and the tenth operating information of the main control panel is obtained.

[0028] If the DC valve control system under test is determined to be locked out based on the tenth operating information, then the backup main control panel is switched to the new main control panel according to the fault request switching command of the tenth operating information. The protection return setting and action setting of the second protection module in the main control panel before the switch are restored, and the power supply of the first protection module in the main control panel before the switch is restored. The DC valve control system under test is reset, and the test platform is controlled to operate according to the rated power to obtain the eleventh operating information of the bridge arm in the DC converter valve.

[0029] Wherein, the second operating data includes the sixth operating information, the seventh operating information, and the eighth operating information; or the second operating data includes the ninth operating information, the tenth operating information, and the eleventh operating information; the sixth protection return setting is less than the return threshold, and the sixth action setting is less than the rated parameter; the fifth protection return setting is less than the return threshold, and the fifth action setting is less than the rated parameter.

[0030] Preferably, the second judgment condition includes: if the sixth operating information is that the third protection module of the main control panel is locked and the main control panel does not output a lockout trip signal, then the DC valve control system under test is operating normally; if the seventh operating information is that the main control panel outputs a fault request switching command and outputs a lockout trip signal, then the DC valve control system under test is locked out; if the eighth operating information is that the bridge arm current is equal to the rated current of the bridge arm of the rated parameter, then only two of the first, second, and third protection modules of the main control panel can work normally, and the main control panel and the backup main control panel have successfully switched over.

[0031] The second judgment condition includes: if the ninth operating information is that the second protection module of the main control panel is locked and the main control panel does not output a lockout trip signal, then the DC valve control system under test is operating normally; if the tenth operating information is that the main control panel outputs a fault request switching command and outputs a lockout trip signal, then the DC valve control system under test is locked out; if the eleventh operating information is that the bridge arm current rise rate is equal to the rated current rise rate of the rated parameter, then only two of the first, second, and third protection modules of the main control panel can work normally, and the main control panel and the backup main control panel have successfully switched over.

[0032] Preferably, if the effectiveness of the overcurrent instantaneous trip protection function of the bridge arm in the DC valve-controlled system under test is being tested, the test platform is controlled to operate according to the third test parameters, and the third operating data of the DC valve-controlled system under test includes:

[0033] According to the power disconnection command of the first protection module of the backup main control screen and the disconnection command of the second protection module from the current measuring element of the DC converter valve in the third test parameters, the test platform is controlled to operate in sequence to obtain the twelfth operating information of the backup main control screen;

[0034] Based on the twelfth operating information, it is determined that the DC valve control system under test executes the non-switching instruction. Then, based on the disconnection instruction of the first protection module of the main control panel and the current measurement element of the DC converter valve and the power disconnection instruction of the second protection module in the third test parameters, the test platform is controlled to operate in sequence to obtain the thirteenth operating information of the main control panel.

[0035] Based on the thirteenth operating information, it is determined that the DC valve control system under test executes the non-switching instruction. Then, based on the exit instruction and switching instruction of the overcurrent instantaneous trip protection function of the third protection module of the main control panel in the third test parameter, the test platform is controlled to operate, and the fourteenth operating information is obtained.

[0036] Based on the fourteenth operating information, it is determined that the DC valve control system under test is operating normally. Then, based on the third protection return setting and the third action setting of the third protection module of the main control panel after switching in the third test parameters, the test platform is controlled to operate, and the fifteenth operating information of the main control panel after switching is obtained.

[0037] Based on the fifteenth operating information, if the DC valve control system under test is locked, then the protection return setting and action setting of the third protection module in the main control panel after the switch is restored, and the DC valve control system under test is reset.

[0038] or,

[0039] If the effectiveness of the current rise rate protection function of the bridge arm in the DC valve-controlled system under test is to be tested, the third operating data of the DC valve-controlled system under test obtained by controlling the test platform according to the third test parameters includes:

[0040] According to the disconnection command of the second protection module of the backup main control screen and the current measurement element of the DC converter valve in the third test parameters, and the exit command of the current rise rate protection function of the third protection module, the test platform is controlled to operate in sequence to obtain the sixteenth operating information of the backup main control screen;

[0041] Based on the sixteenth operating information, it is determined that the DC valve control system under test executes the non-switching instruction. Then, based on the disconnection instruction between the third protection module of the main control panel and the current measuring element of the DC converter valve and the power disconnection instruction of the first protection module in the third test parameters, the test platform is controlled to operate in sequence to obtain the seventeenth operating information of the main control panel.

[0042] Based on the seventeenth operating information, it is determined that the DC valve control system under test executes the non-switching instruction. Then, based on the exit instruction and switching instruction of the current rise rate protection function of the second protection module of the main control panel in the third test parameters, the test platform is controlled to operate, and the eighteenth operating information is obtained.

[0043] Based on the eighteenth operating information, it is determined that the DC valve control system under test is operating normally. Then, based on the first protection return setting and first action setting of the first protection module of the main control panel after switching in the third test parameters, the test platform is controlled to operate, and the nineteenth operating information of the main control panel after switching is obtained.

[0044] Based on the nineteenth operating information, if the DC valve control system under test is locked, then the protection return setting and action setting of the first protection module in the main control panel after the switch is restored, and the DC valve control system under test is reset.

[0045] The third operating data includes the twelfth, thirteenth, fourteenth, and fifteenth operating information, or the third operating data includes the sixteenth, seventeenth, eighteenth, and nineteenth operating information; the third protection return setting is less than the return threshold, and the third action setting is less than the rated current of the bridge arm of the rated parameter; the first protection return setting is less than the return threshold, and the first action setting is less than the rated current rise rate of the rated parameter; after switching, the primary control panel becomes the backup control panel.

[0046] Preferably, the third judgment condition includes: if the twelfth operating information is a minor fault message output by the backup main control panel, the DC valve control system under test executes a no-switching instruction; if the thirteenth operating information is a minor fault message output by the primary main control panel, the DC valve control system under test executes a no-switching instruction; if the fourteenth operating information is a successful switch between the primary main control panel and the backup main control panel and the DC valve control system under test is unaffected, the DC valve control system under test operates normally; if the fifteenth operating information is a blocking trip signal output by the primary main control panel after switching, the DC valve control system under test is blocked and shut down.

[0047] or,

[0048] The third judgment condition includes: if the sixteenth operating information is a minor fault message output by the backup main control panel, the DC valve control system under test executes a no-switching instruction; if the seventeenth operating information is a minor fault message output by the primary main control panel, the DC valve control system under test executes a no-switching instruction; if the eighteenth operating information is a successful switch between the primary main control panel and the backup main control panel and the DC valve control system under test is unaffected, the DC valve control system under test operates normally; if the nineteenth operating information is a blocking trip signal output by the primary main control panel after the switch, the DC valve control system under test is blocked and shut down.

[0049] On the other hand, a test device for the effectiveness of DC valve-controlled bridge arm protection function in a sea-wind medium-frequency power transmission system is provided, including a test platform construction module, a first test module, a second test module, a third test module, and a judgment module;

[0050] The test platform construction module is used to obtain the test topology diagram of the connection between the DC converter valve and the DC valve control system under test, as well as the rated power of the DC converter valve. Based on the test topology diagram, a test platform is constructed, and the test platform is controlled to operate according to the rated power to obtain the rated parameters of the bridge arm in the DC converter valve. The DC valve control system under test includes a primary main control panel and a backup main control panel connected to the DC converter valve and redundant with each other. Both the primary and backup main control panels include the same and redundant first protection module, second protection module, and third protection module.

[0051] The first test module is used to acquire the first test parameters, control the operation of the test platform according to the first test parameters, and obtain the first operating data of the DC valve control system under test;

[0052] The second test module is used to acquire the second test parameters, control the operation of the test platform according to the second test parameters, and obtain the second operating data of the DC valve control system under test;

[0053] The third test module is used to acquire the third test parameters, control the operation of the test platform according to the third test parameters, and obtain the third operating data of the DC valve control system under test.

[0054] The judgment module is used to determine whether the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency transmission system under test has passed the test, based on whether the first operating data, the second operating data, and the third operating data respectively meet the corresponding first judgment condition, the second judgment condition, and the third judgment condition.

[0055] Preferably, the first test module includes a first test submodule, a second test submodule, a third test submodule, a fourth test submodule, and a fifth test submodule;

[0056] The first test submodule is used to control the operation of the test platform according to the first protection return setting and the first action setting of the first protection module of the backup main control screen in the first test parameters, so as to obtain the first operation information of the backup main control screen;

[0057] The second test submodule is used to determine that the DC valve control system under test is operating normally based on the first operating information, and then control the test platform to operate according to the second protection return setting and the second action setting of the second protection module of the backup main control panel in the first test parameters, so as to obtain the second operating information of the backup main control panel;

[0058] The third test submodule is used to determine that the DC valve control system under test is operating normally based on the second operating information. If so, it restores the protection return setpoints and action setpoints of the first protection module and the second protection module in the backup main control panel, and controls the test platform to operate based on the fourth protection return setpoint and the fourth action setpoint of the first protection module of the main control panel in the first test parameters, thereby obtaining the third operating information of the main control panel.

[0059] The fourth test submodule is used to determine that the DC valve control system under test is operating normally based on the third operating information. Then, it controls the test platform to operate according to the fifth protection return setting and the fifth action setting of the second protection module of the main control panel in the first test parameters, and obtains the fourth operating information of the main control panel.

[0060] The fifth test submodule is used to determine the lockout trip of the DC valve control system under test based on the fourth operating information, then restore the protection return set value and action set value of the first protection module and the second protection module in the main control panel, control the DC valve control system under test to reset, and control the test platform to operate according to the rated power to obtain the fifth operating information of the bridge arm in the DC converter valve;

[0061] The first operating data includes the first operating information, the second operating information, the third operating information, the fourth operating information, and the fifth operating information; the first protection return setting is less than the return threshold, and the first action setting is less than the rated parameter; the second protection return setting is less than the return threshold, and the second action setting is less than the rated parameter; the fourth protection return setting is less than the return threshold, and the fourth action setting is less than the rated parameter; the fifth protection return setting is less than the return threshold, and the fifth action setting is less than the rated parameter.

[0062] On the other hand, a terminal device is provided, including a processor and a memory;

[0063] The memory is used to store program code and transmit the program code to the processor;

[0064] The processor is used to execute the test method for the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency transmission system as described above, according to the instructions in the program code.

[0065] This invention relates to a test method, apparatus, and equipment for assessing the effectiveness of the DC valve-controlled bridge arm protection function in a marine wind-driven medium-frequency transmission system. The method includes the following steps: obtaining a test topology diagram of the connection between the DC converter valve and the DC valve-controlled system under test, as well as the rated power of the DC converter valve; constructing a test platform based on the test topology diagram and controlling the test platform operation according to the rated power to obtain the rated parameters of the bridge arm in the DC converter valve; the DC valve-controlled system under test includes a primary main control panel and a backup main control panel connected to the DC converter valve and redundantly configured, both of which include identical and redundant first protection modules, second protection modules, and third protection modules; obtaining the first test... The test platform is operated according to the first test parameter to obtain the first operating data of the DC valve-controlled system under test; the second test parameter is obtained and the test platform is operated according to the second test parameter to obtain the second operating data of the DC valve-controlled system under test; the third test parameter is obtained and the test platform is operated according to the third test parameter to obtain the third operating data of the DC valve-controlled system under test; the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency transmission system under test is determined based on whether the first operating data, the second operating data, and the third operating data respectively meet the corresponding first judgment condition, the second judgment condition, and the third judgment condition.

[0066] As can be seen from the above technical solutions, this application has the following advantages:

[0067] The proposed test method for the effectiveness of the DC valve-controlled bridge arm protection function in a sea-wind medium-frequency transmission system obtains test data on the effectiveness of the DC valve-controlled bridge arm protection function of the system under test by constructing a test platform and controlling the operation of the test platform using the first, second, and third test parameters. This method enables the testing of the effectiveness of the DC valve-controlled bridge arm protection function of the system under test and solves the technical problem of the lack of existing methods for testing the effectiveness of protection functions in flexible DC valve-controlled systems.

[0068] The testing device for the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency transmission system is implemented through a test platform construction module, a first test module, a second test module, a third test module, and a judgment module. Attached Figure Description

[0069] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0070] Figure 1This is a flowchart of the steps for testing the effectiveness of the DC valve-controlled bridge arm protection function in the offshore wind medium-frequency power transmission system described in this application embodiment;

[0071] Figure 2 This is a schematic diagram of the frame of the test device for the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency power transmission system described in the embodiments of this application;

[0072] Figure 3 This is a schematic diagram of the terminal device described in an embodiment of this application. Detailed Implementation

[0073] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0074] In the description of the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0075] In the embodiments of this application, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0076] The main control panel refers to the DC valve control system, which is generally composed of nine cabinets. Among them, there are two identical and redundant main control cabinets, which undertake most of the control and protection functions of the DC valve control system. In addition, there are six bridge arm pulse distribution panels, which are mainly responsible for distributing the module control commands issued by the main control panel to each power module. They are also responsible for collecting and summarizing the status information of each power module and uploading it to the two main control cabinets. The remaining cabinet is an auxiliary function cabinet, which is mainly responsible for leakage detection, intelligent monitoring and waveform recording of the DC converter valve.

[0077] The function of the protection module is to receive the measured value Iarm of the bridge arm current uploaded by the bridge arm current measuring device, perform calculation and analysis on it, and finally output a bridge arm current fast protection action signal by the protection module.

[0078] This application provides a testing method, apparatus, and equipment for the effectiveness of the protection function of a DC valve-controlled bridge arm in a sea-wind medium-frequency power transmission system, solving the technical problem of the lack of a method for testing the effectiveness of protection functions in flexible DC valve-controlled systems.

[0079] Example 1:

[0080] Figure 1 This is a flowchart illustrating the steps of a test method for assessing the effectiveness of the DC valve-controlled bridge arm protection function in a marine wind-driven medium-frequency power transmission system, as described in an embodiment of this application.

[0081] like Figure 1 As shown in the figure, this application provides a test method for the effectiveness of the DC valve-controlled bridge arm protection function in a marine wind medium-frequency transmission system, including the following steps:

[0082] S1. Obtain the test topology diagram of the connection between the DC converter valve and the DC valve control system under test, as well as the rated power of the DC converter valve. Construct a test platform based on the test topology diagram and control the operation of the test platform according to the rated power to obtain the rated parameters of the bridge arm in the DC converter valve. The DC valve control system under test includes a main control panel and a backup main control panel connected to the DC converter valve and redundant to each other. Both the main control panel and the backup main control panel include the same and redundant first protection module, second protection module and third protection module.

[0083] It should be noted that step S1 involves constructing a test platform and obtaining the data for subsequent judgments through the test platform. In this embodiment, the test platform includes a real-time simulator and a communication conversion device for connecting the real-time simulator with the DC valve-controlled system under test. The real-time simulator contains a simulation model of the DC converter valve. The test method for the effectiveness of the DC valve-controlled bridge arm protection function of this offshore wind medium-frequency transmission system obtains the corresponding rated parameters based on the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency transmission system under test. For example, if the effectiveness of the overcurrent instantaneous trip protection function of the bridge arm is tested, the rated parameter is the rated current of the bridge arm; if the effectiveness of the current rise rate protection function of the bridge arm is tested, the rated parameter is the rated current rise rate.

[0084] In the embodiments of this application, the DC converter valve is generally composed of 6 bridge arms. Each bridge arm is connected to 3 independent current measuring elements. The 3 current measuring elements measure the instantaneous value Iarm of the bridge arm current flowing through the bridge arm. Taking one bridge arm as AU as an example, the instantaneous value Iarm of the bridge arm current flowing through the bridge arm at any time has 3 independent measured values ​​IarmAU1, IarmAU2 and IarmAU3.

[0085] In the embodiments of this application, a single DC valve control system under test is jointly managed by two redundant DC valve control main control panels, A and B, which are responsible for controlling and protecting the DC converter valves. During normal operation, either A or B is typically used as the primary control panel, with the other serving as a backup. When the DC valve control system under test is operating normally, the primary control panel is responsible for controlling and protecting the DC converter valves. Only control and protection signals issued by the primary control panel can be output and actually executed by the DC converter valves; control and protection signals issued by the backup control panel cannot be output and therefore cannot be actually executed by the DC converter valves. If the primary control panel malfunctions or the operator issues a primary / backup switchover command, the primary control panel will automatically switch its current status to backup, while the previously backup control panel will simultaneously switch its current status to primary.

[0086] It should be noted that the hardware configuration and software functions of the two redundant DC valve-controlled main control panels A and B are completely identical. Each set of flexible DC valve-controlled main control panels contains a protection module consisting of three identical, redundant bridge arm current fast protection boards.

[0087] In this embodiment, the arm current of any one of the six arms in the DC converter valve contains three measured values. These values ​​are measured by three independent current measuring elements and then uploaded to the first protection module A-PRO1, the second protection module A-PRO2, and the third protection module A-PRO3, which are composed of three arm current fast protection boards on the main control panel of the DC valve control system under test. The second protection module B-PRO1, the second protection module B-PRO2, and the third protection module B-PRO3, which are composed of three arm current fast protection boards on the backup main control panel of the DC valve control system under test, are also included. The protection modules composed of six arm current fast protection boards in the two main control panels calculate and analyze the received arm current measured values. However, only the arm current fast protection action signal output by the three protection modules in the main control panel can actually be output.

[0088] It should be noted that, taking the case of bridge arm AU experiencing bridge arm current overcurrent, and A set of DC valve-controlled main control panels serving as the primary main control panel and B set of DC valve-controlled main control panels serving as the backup main control panel as an example, the bridge arm overcurrent instantaneous trip protection function and the bridge arm current rise rate protection function in the DC valve-controlled system under test include:

[0089] First, when any one of the first, second, and third protection modules (A / B-PRO1, A / B-PRO2, A / B-PRO3) in the main or backup main control panel detects that the measured value of the bridge arm current sampled and uploaded to this protection module, IarmAU, continuously exceeds the set bridge arm overcurrent instantaneous trip protection action value, Iarm... set And the duration t exceeds the set time threshold t set1 If the calculated rise rate of the measured arm current IarmAU (di / dtAU) continuously exceeds the set arm current rise rate protection action setting (di / dt), then... set And the duration t exceeds the set time threshold t set1 When this happens, the protection module should issue an action signal. The calculated rise rate of the measured current value IarmAU of the bridge arm AU is di / dtAU = dIarmAU / dt, where dt is the sampling period for the bridge arm current sampling (usually 10µs), and dIarmAU is the change in the measured current value IarmAU of the bridge arm AU within one sampling period.

[0090] Second, when any one of the first, second, and third protection modules (A / B-PRO1, A / B-PRO2, A / B-PRO3) in the main or backup main control panel detects that the measured value of the bridge arm current IarmAU, which is sampled and uploaded to this protection module, is continuously less than the set bridge arm overcurrent instantaneous trip protection value Iarm, the protection will return to the set value Iarm. return And the duration t exceeds the set time threshold t set2 If the measured or measured arm current IarmAU rise rate di / dtAU remains less than the set arm current rise rate protection value di / dt, the protection will return to the set value. return And the duration t exceeds the set time threshold t set2 When this occurs, the protection module should stop sending action signals.

[0091] Third, when the first protection module A-PRO1, the second protection module A-PRO2, and the third protection module A-PRO3 in the main control panel are all working normally, the main control panel will detect that at least two protection modules have issued action signals. The main control panel should output a blocking trip signal, the DC valve control system under test will be blocked and shut down, and the background monitoring interface of the DC valve control system under test will display a message that says "Bridge arm AU's bridge arm current overcurrent instantaneous trip protection action blocking trip" or "Bridge arm AU's bridge arm current rise rate protection action blocking trip".

[0092] Fourth, when one of the protection modules A-PRO1, A-PRO2, and A-PRO3 inside the main control panel malfunctions and cannot work properly, the main control panel will detect that at least one protection module has issued an action signal. The main control panel should output a blocking trip signal, the DC valve control system under test will be blocked and shut down, and the background monitoring interface of the DC valve control system under test will display a message saying "Bridge arm AU's bridge arm current overcurrent instantaneous trip protection action blocking trip" or "Bridge arm AU's bridge arm current rise rate protection action blocking trip".

[0093] Fifth, when two of the protection modules (A-PRO1, A-PRO2, and A-PRO3) inside the main control panel malfunction and cannot work properly, the main control panel will detect that one of the protection modules has issued an action signal. The main control panel should output a blocking trip signal, the DC valve control system under test will be blocked and shut down, and the message "Bridge arm AU's bridge arm current overcurrent instantaneous trip protection action blocking trip" or "Bridge arm AU's bridge arm current rise rate protection action blocking trip" will be displayed on the background monitoring interface of the DC valve control system under test.

[0094] Sixth, when the first protection module A-PRO1, the second protection module A-PRO2, and the third protection module A-PRO3 inside the main control panel all malfunction and cannot work properly, the main control panel issues a "fault request switch" to reduce the duty status of this DC valve control main control panel from the main control panel to the standby control panel, while the duty status of the standby DC valve control main control panel is upgraded from the standby control panel to the main control panel.

[0095] Seventh, when one or two (excluding three) of the first, second, and third protection modules (A / B-PRO1, A / B-PRO2, A / B-PRO3) within the primary or backup main control panel malfunction and cannot function properly, the primary or backup main control panel will report a "minor fault" message. If the primary main control panel reports a minor fault, while the backup main control panel remains normal and does not report a minor fault or request a switchover, a switchover between the primary and backup DC valve-controlled main control panels will occur. If the primary main control panel reports a minor fault, and the backup main control panel also reports a minor fault or requests a switchover, no switchover will occur. If the primary main control panel requests a switchover, a direct switchover between the primary and backup DC valve-controlled main control panels will occur. If the backup main control panel reports a minor fault or requests a switchover, no switchover will occur.

[0096] S2. Obtain the first test parameters, control the test platform to operate according to the first test parameters, and obtain the first operating data of the DC valve control system under test.

[0097] It should be noted that in step S2, the first test parameters are obtained and the test platform is controlled to operate according to the first test parameters to conduct the first test on the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency transmission system under test. In this embodiment, the test in step S2 is to verify that the three protection modules of the main control panel and the backup control panel can work normally. If at least two of the three protection modules of the backup control panel have certain judgment actions, the backup control panel cannot output a blocking trip signal; however, if at least two of the three protection modules of the main control panel have certain judgment actions, the main control panel should output a blocking trip signal.

[0098] S3. Obtain the second test parameters, control the test platform to operate according to the second test parameters, and obtain the second operating data of the DC valve control system under test.

[0099] It should be noted that in step S3, the second test parameters are obtained and the test platform is controlled according to the second test parameters to perform a second test on the effectiveness of the DC valve-controlled bridge arm protection function of the under-test offshore wind medium-frequency transmission system. In this embodiment, the test in step S3 is to verify that if only 2 of the 3 protection modules of the main control panel can work normally, and if at least 1 of the 2 protection modules of the main control panel judges to act, the main control panel should output a blocking trip signal; it also verifies that if 1 to 2 of the 3 protection modules of the main control panel cannot work due to a fault, the main control panel should report a minor fault and request a switching command, and at this time all 3 protection modules of the backup control panel can work normally, the backup control panel does not report a minor fault, and the DC valve-controlled system under test should be able to switch successfully between the main control panel and the backup control panel.

[0100] S4. Obtain the third test parameter, control the test platform to operate according to the third test parameter, and obtain the third operating data of the DC valve control system under test.

[0101] It should be noted that in step S4, the third test parameters are obtained and the test platform is controlled according to the third test parameters to perform a third test on the effectiveness of the DC valve-controlled bridge arm protection function of the under-test offshore wind medium-frequency transmission system. In this embodiment, the test in step S4 is to verify that if all three protection modules of the main control panel fail and cannot work normally, the main control panel should report an emergency fault and output a request for switching. The DC valve-controlled system under test should be able to successfully switch between the main control panel and the backup control panel. Simultaneously, it also verifies that if only one of the three protection modules of the main control panel can work normally, and if this protection module determines to act, the main control panel should output a blocking trip signal. The test order of steps S2 to S3 can be adjusted according to requirements.

[0102] S5. Based on whether the first operating data, the second operating data, and the third operating data respectively meet the corresponding first judgment condition, the second judgment condition, and the third judgment condition, determine whether the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency transmission system under test has passed the test.

[0103] It should be noted that in step S5, the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency transmission system under test is determined to have passed the test based on the fact that the first operating data, the second operating data, and the third operating data obtained from steps S2 to S4 all meet the corresponding first judgment condition, the second judgment condition, and the third judgment condition.

[0104] This application provides a test method for the effectiveness of the DC valve-controlled bridge arm protection function in a sea-wind medium-frequency transmission system, comprising the following steps: obtaining a test topology diagram of the connection between the DC converter valve and the DC valve-controlled system under test, and the rated power of the DC converter valve; constructing a test platform based on the test topology diagram and controlling the operation of the test platform according to the rated power to obtain the rated parameters of the bridge arm in the DC converter valve; the DC valve-controlled system under test includes a primary main control panel and a backup main control panel connected to the DC converter valve and redundant to each other, and both the primary main control panel and the backup main control panel include the same and redundant first protection module, second protection module, and third protection module; obtaining the first test... The test platform is controlled based on first test parameters to obtain first operating data of the DC valve-controlled system under test. Second test parameters are acquired, and the test platform is controlled based on these second test parameters to obtain second operating data of the DC valve-controlled system under test. Third test parameters are acquired, and the test platform is controlled based on these third test parameters to obtain third operating data of the DC valve-controlled system under test. The effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind-driven medium-frequency transmission system under test is determined based on whether the first, second, and third operating data respectively meet the corresponding first, second, and third judgment conditions. This method for testing the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind-driven medium-frequency transmission system under test obtains test data by constructing a test platform and controlling its operation with the acquired first, second, and third test parameters. This achieves the testing of the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind-driven medium-frequency transmission system under test, solving the technical problem of the lack of existing methods for testing the effectiveness of protection functions in flexible DC valve-controlled systems.

[0105] In one embodiment of this application, the test platform is controlled to operate according to the first test parameters to obtain the first operating data of the DC valve-controlled system under test, including:

[0106] Based on the first protection return setting and first action setting of the first protection module of the backup main control screen in the first test parameters, the test platform is controlled to run, and the first running information of the backup main control screen is obtained.

[0107] If the DC valve control system under test is determined to be operating normally based on the first operating information, then the test platform is controlled to operate based on the second protection return setting and the second action setting of the second protection module of the backup main control panel in the first test parameters, and the second operating information of the backup main control panel is obtained.

[0108] If the DC valve control system under test is determined to be operating normally based on the second operating information, then the protection return settings and action settings of the first protection module and the second protection module in the backup main control panel are restored. The test platform is controlled to operate based on the fourth protection return settings and the fourth action settings of the first protection module of the main control panel in the first test parameters, and the third operating information of the main control panel is obtained.

[0109] If the DC valve control system under test is determined to be operating normally based on the third operating information, then the test platform is controlled to operate based on the fifth protection return setting and the fifth action setting of the second protection module of the main control panel in the first test parameters, and the fourth operating information of the main control panel is obtained.

[0110] If the test DC valve control system is determined to be locked out and tripped based on the fourth operating information, the protection return setpoints and action setpoints of the first protection module and the second protection module in the main control panel are restored, the test DC valve control system is reset, and the test platform is operated according to the rated power to obtain the fifth operating information of the bridge arm in the DC converter valve.

[0111] The first operating data includes first operating information, second operating information, third operating information, fourth operating information, and fifth operating information; the first protection return setting is less than the return threshold, and the first action setting is less than the rated parameter; the second protection return setting is less than the return threshold, and the second action setting is less than the rated parameter; the fourth protection return setting is less than the return threshold, and the fourth action setting is less than the rated parameter; the fifth protection return setting is less than the return threshold, and the fifth action setting is less than the rated parameter.

[0112] The first judgment condition includes: if the first operating information is that the first protection module of the standby main control panel is locked, while the second and third protection modules are not locked, and the standby main control panel does not output a lockout trip signal, then the DC valve control system under test is operating normally; if the second operating information is that the second protection module of the standby main control panel is locked, and the standby main control panel does not output a lockout trip signal, then the DC valve control system under test is operating normally; if the third operating information is that the first protection module of the main control panel is locked, while the second and third protection modules are not locked. If the fourth operating information is that the second protection module of the main control panel is locked and the main control panel outputs a lockout trip signal, then the DC valve control system under test is locked out and tripped; if the fifth operating information is that the arm current is equal to the rated current of the arm in the rated parameters or the fifth operating information is that the rate of rise of the arm current is equal to the rate of rise of the rated current in the rated parameters, then the first protection module, the second protection module, and the third protection module of both the main control panel and the backup control panel can operate normally.

[0113] It should be noted that, for the effectiveness test of the overcurrent instantaneous overcurrent protection function of the bridge arm, the protection return setting is the overcurrent instantaneous overcurrent protection return setting Iarm. return The corresponding return threshold can be 10A, and the action setting is the overcurrent instantaneous trip protection action setting Iarm. set The corresponding rated parameter is the bridge arm rated current Iarm. 额定 If the effectiveness of the current rise rate protection function of the bridge arm is tested, the protection return setting is the bridge arm current rise rate protection return setting di / dt. return The corresponding return threshold can be 0.1A / µs, and the action setting is the overcurrent instantaneous trip protection action setting Iarm. set The corresponding rated parameter is the bridge arm current rise rate protection action setting di / dt. set .

[0114] In one embodiment of this application, if the effectiveness of the overcurrent instantaneous trip protection function of the bridge arm in the DC valve control system under test is to be tested, the second operating data of the DC valve control system under test obtained by controlling the test platform according to the second test parameters includes:

[0115] Based on the sixth protection return setting and sixth action setting of the third protection module of the main control panel in the second test parameters, the test platform is controlled to operate, and the sixth operation information of the main control panel is obtained.

[0116] If the DC valve control system under test is determined to be operating normally based on the sixth operating information, then the test platform is controlled to operate according to the power disconnect command of the second protection module of the main control panel in the second test parameters, and the seventh operating information of the main control panel is obtained.

[0117] If the DC valve control system under test is locked out based on the seventh operating information, the backup main control panel is switched to the new main control panel according to the fault request switching command of the seventh operating information. The protection return setting and action setting of the third protection module in the main control panel before the switch are restored, and the power supply of the second protection module in the main control panel before the switch is restored. The DC valve control system under test is reset, and the test platform is operated according to the rated power to obtain the eighth operating information of the bridge arm in the DC converter valve.

[0118] or,

[0119] If the effectiveness of the current rise rate protection function of the bridge arm in the DC valve control system under test is to be tested, the second operating data of the DC valve control system under test obtained by controlling the test platform according to the second test parameters includes:

[0120] Based on the fifth protection return setting and fifth action setting of the second protection module of the main control panel in the second test parameters, the test platform is controlled to operate, and the ninth operation information of the main control panel is obtained.

[0121] If the DC valve control system under test is judged to be operating normally based on the ninth operating information, then the test platform is controlled to operate according to the power disconnect command of the first protection module of the main control panel in the second test parameters, and the tenth operating information of the main control panel is obtained.

[0122] If the DC valve control system under test is determined to be locked out based on the tenth operating information, the backup main control panel is switched to the new main control panel according to the fault request switching command of the tenth operating information. The protection return setting and action setting of the second protection module in the main control panel before the switch are restored, as well as the power supply of the first protection module in the main control panel before the switch are restored. The DC valve control system under test is reset, and the test platform is operated according to the rated power to obtain the eleventh operating information of the bridge arm in the DC converter valve.

[0123] The second operating data includes the sixth, seventh, and eighth operating information; or the second operating data includes the ninth, tenth, and eleventh operating information; the sixth protection return setting is less than the return threshold, and the sixth action setting is less than the rated parameter; the fifth protection return setting is less than the return threshold, and the fifth action setting is less than the rated parameter;

[0124] The second judgment condition includes: if the sixth operating information is that the third protection module of the main control panel is locked and the main control panel does not output a lockout trip signal, then the DC valve control system under test is operating normally; if the seventh operating information is that the main control panel outputs a fault request switching command and outputs a lockout trip signal, then the DC valve control system under test is locked and shut down; if the eighth operating information is that the bridge arm current is equal to the rated current of the bridge arm with the rated parameters, then only two of the first, second, and third protection modules of the main control panel can work normally and the main control panel and the backup main control panel can be successfully switched on and used.

[0125] or,

[0126] The second judgment conditions include: if the ninth operating information is that the second protection module of the main control panel is locked and the main control panel does not output a lockout trip signal, then the DC valve control system under test is operating normally; if the tenth operating information is that the main control panel outputs a fault request switching command and outputs a lockout trip signal, then the DC valve control system under test is locked out; if the eleventh operating information is that the bridge arm current rise rate is equal to the rated current rise rate of the rated parameters, then only two of the first, second, and third protection modules of the main control panel can work normally, and the main control panel and the backup main control panel have successfully switched over.

[0127] It should be noted that, for testing the effectiveness of the overcurrent instantaneous trip protection function of the bridge arm, based on the sixth operating information indicating that the DC valve control system under test is operating normally, the power supply to the second protection module of the main control panel is disconnected. The main control panel reports a minor fault and requests switching. The main control panel should output a lockout trip signal, and the DC valve control system under test will be locked out and shut down. The switching between the main control panel and the backup control panel is successful. Afterwards, the protection action of the third protection module of the original main control panel is restored and the set value is returned. The power supply to the second protection module of the original main control panel is restored, the DC valve control system under test is reset, and the test platform is restarted under rated power control. At this time, the bridge arm current value is Iarm. 额定 This indicates that the second test of the effectiveness of the overcurrent instantaneous trip protection function of the bridge arm in the DC valve-controlled system under test has been completed. If the effectiveness test of the bridge arm's current rise rate protection function is to be performed, based on the ninth operating information, if the DC valve-controlled system under test is judged to be operating normally, the power supply to the first protection module of the main control panel is disconnected. The main control panel reports a minor fault and requests switching. The main control panel should output a lockout trip signal, and the DC valve-controlled system under test is locked out. The switching between the main control panel and the backup control panel is successful. Afterwards, the protection action of the second protection module of the original main control panel is restored and the set value is returned. The power supply to the first protection module of the original main control panel is restored, the DC valve-controlled system under test is reset, and the test platform is restarted under rated power control. At this time, the calculated rise rate of the measured bridge arm current is di / dt. setThis indicates that the second test of the effectiveness of the current rise rate protection function of the bridge arm in the DC valve-controlled system under test has been completed.

[0128] In one embodiment of this application, if the effectiveness of the overcurrent instantaneous trip protection function of the bridge arm in the DC valve control system under test is to be tested, the test platform is controlled to operate according to the third test parameters, and the third operating data of the DC valve control system under test is obtained, including:

[0129] Based on the power disconnection command of the first protection module of the backup main control panel and the disconnection command of the connection between the second protection module and the current measuring element of the DC converter valve in the third test parameters, the test platform is controlled to operate in sequence to obtain the twelfth operating information of the backup main control panel;

[0130] Based on the twelfth operating information, it is determined that the DC valve control system under test executes the non-switching instruction. Then, based on the disconnection instruction between the first protection module of the main control panel and the current measuring element of the DC converter valve and the power disconnection instruction of the second protection module in the third test parameters, the test platform is controlled to operate in sequence to obtain the thirteenth operating information of the main control panel.

[0131] Based on the thirteenth operating information, it is determined that the DC valve control system under test executes the non-switching instruction. Then, based on the exit instruction and switching instruction of the overcurrent instantaneous trip protection function of the third protection module of the main control panel in the third test parameter, the test platform is controlled to operate, and the fourteenth operating information is obtained.

[0132] Based on the fourteenth operating information, it is determined that the DC valve control system under test is operating normally. Then, based on the third protection return setting and the third action setting of the third protection module of the main control panel after switching in the third test parameters, the test platform is controlled to operate, and the fifteenth operating information of the main control panel after switching is obtained.

[0133] If the DC valve control system under test is locked based on the fifteenth operating information, then the protection return setting and action setting of the third protection module in the main control panel after the switch is restored, as well as the control reset of the DC valve control system under test;

[0134] or,

[0135] If the effectiveness of the current rise rate protection function of the bridge arm in the DC valve control system under test is to be tested, the third operating data of the DC valve control system under test obtained by controlling the test platform according to the third test parameters includes:

[0136] Based on the disconnection command between the second protection module of the backup main control panel and the current measurement element of the DC converter valve in the third test parameters, and the exit command of the current rise rate protection function of the third protection module, the test platform is controlled to operate in sequence to obtain the sixteenth operating information of the backup main control panel.

[0137] Based on the sixteenth operating information, it is determined that the DC valve control system under test executes the non-switching instruction. Then, based on the disconnection instruction between the third protection module of the main control panel and the current measuring element of the DC converter valve and the power disconnection instruction of the first protection module in the third test parameters, the test platform is controlled to operate in sequence to obtain the seventeenth operating information of the main control panel.

[0138] Based on the seventeenth operating information, it is determined that the DC valve control system under test executes the non-switching instruction. Then, based on the exit instruction and switching instruction of the current rise rate protection function of the second protection module of the main control panel in the third test parameter, the test platform is controlled to operate, and the eighteenth operating information is obtained.

[0139] Based on the eighteenth operating information, it is determined that the DC valve control system under test is operating normally. Then, based on the first protection return setting and first action setting of the first protection module of the main control panel after switching in the third test parameters, the test platform is controlled to operate, and the nineteenth operating information of the main control panel after switching is obtained.

[0140] If the DC valve control system under test is locked based on the nineteenth operation information, then the protection return setting and action setting of the first protection module in the main control panel after the switch is restored, as well as the control reset of the DC valve control system under test;

[0141] The third operating data includes the twelfth, thirteenth, fourteenth, and fifteenth operating information, or the third operating data includes the sixteenth, seventeenth, eighteenth, and nineteenth operating information; the third protection return setting is less than the return threshold, and the third action setting is less than the rated current of the bridge arm of the rated parameter; the first protection return setting is less than the return threshold, and the first action setting is less than the rated current rise rate of the rated parameter; after switching, the main control panel becomes the backup main control panel;

[0142] The third judgment condition includes: if the twelfth operating information is a minor fault message output by the standby main control panel, the DC valve control system under test executes the no-switching instruction; if the thirteenth operating information is a minor fault message output by the primary main control panel, the DC valve control system under test executes the no-switching instruction; if the fourteenth operating information is a successful switch between the primary and standby main control panels and the DC valve control system under test is unaffected, the DC valve control system under test operates normally; if the fifteenth operating information is a lockout trip signal output by the primary main control panel after the switch, the DC valve control system under test is locked out and shut down.

[0143] or,

[0144] The third judgment condition includes: if the sixteenth operating information is a minor fault message output by the standby main control panel, the DC valve control system under test executes the no-switching instruction; if the seventeenth operating information is a minor fault message output by the primary main control panel, the DC valve control system under test executes the no-switching instruction; if the eighteenth operating information is a successful switch between the primary and standby main control panels and the DC valve control system under test is unaffected, the DC valve control system under test operates normally; if the nineteenth operating information is a blocking trip signal output by the primary main control panel after the switch, the DC valve control system under test is blocked and shut down.

[0145] It should be noted that, for testing the effectiveness of the bridge arm overcurrent instantaneous overcurrent protection function, first disconnect the power supply to the first protection module of the backup main control panel, then disconnect the transmission fiber optic cable for receiving the measured bridge arm current value of the second protection module of the backup main control panel. The backup main control panel reports a minor fault but does not switch. Next, disconnect the transmission fiber optic cable for receiving the measured bridge arm current value of the first protection module of the primary main control panel, then disconnect the power supply to the second protection module of the primary main control panel. The primary main control panel reports a minor fault but does not switch. Exit the bridge arm overcurrent instantaneous overcurrent protection function of the third protection module of the primary main control panel in the background interface of the DC valve control system under test. The primary main control panel correctly switches to the backup main control panel, and the backup main control panel synchronously switches to the primary main control panel. The DC valve control system under test continues to operate normally without disturbance. Furthermore, the bridge arm overcurrent instantaneous overcurrent protection of the third protection module of the DC valve control main control panel (i.e., the original backup main control panel) returns to the set value Iarm after the switch. return Less than 10A, action setpoint Iarm set Less than Iarm 额定After switching, the main DC valve control panel (the original backup main control panel) outputs a lockout trip signal, and the DC valve control system under test is locked out and shut down. Finally, the protection action and return setting of the third protection module of the main DC valve control panel (the original backup main control panel) that became the main DC valve control panel after switching are restored, all power supplies, optical fibers, and function enable are restored, and the DC valve control system under test is reset. To test the effectiveness of the bridge arm current rise rate protection function, first disconnect the transmission fiber optic cable for receiving the measured bridge arm current value from the second protection module of the standby main control panel. Then, in the background interface of the DC valve control system under test, exit the bridge arm current rise rate protection function of the third protection module of the standby main control panel. The standby main control panel reports a minor fault but does not switch. Next, disconnect the transmission fiber optic cable for receiving the measured bridge arm current value from the third protection module of the primary main control panel, and then disconnect the power supply of the first protection module of the primary main control panel. The primary main control panel reports a minor fault but does not switch. In the background interface of the DC valve control system under test, exit the bridge arm current rise rate protection function of the second protection module of the primary main control panel. The primary main control panel correctly switches to the standby main control panel, and the standby main control panel synchronously switches to the primary main control panel. The DC valve control system under test continues to operate normally without disturbance. Finally, the bridge arm current rise rate protection of the first protection module of the DC valve control main control panel (i.e., the original standby main control panel) returns to the set value di / dt. return Less than 0.1A / us, action setpoint di / dt set Less than di / dt 额定 After switching, the main DC valve control panel (the original backup main control panel) outputs a lockout trip signal, and the DC valve control system under test is locked out and shut down. Finally, the protection action and return setting of the first protection module of the main DC valve control panel (the original backup main control panel) are restored, all power supplies, optical fibers, and function enable are restored, and the DC valve control system under test is reset.

[0146] Example 2:

[0147] Figure 2 This is a schematic diagram of the frame of the test device for the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency power transmission system described in the embodiments of this application.

[0148] like Figure 2 As shown in the figure, this application embodiment provides a test device for the effectiveness of DC valve-controlled bridge arm protection function in a sea wind medium frequency transmission system, including a test platform construction module 100, a first test module 200, a second test module 300, a third test module 400, and a judgment module 500;

[0149] The test platform construction module 100 is used to obtain the test topology diagram of the connection between the DC converter valve and the DC valve control system under test, as well as the rated power of the DC converter valve. The test platform is constructed according to the test topology diagram and the test platform is controlled to operate according to the rated power to obtain the rated parameters of the bridge arm in the DC converter valve. The DC valve control system under test includes a main control panel and a backup main control panel connected to the DC converter valve and redundant to each other. Both the main control panel and the backup main control panel include the same and redundant first protection module, second protection module and third protection module.

[0150] The first test module 200 is used to acquire the first test parameters, control the operation of the test platform according to the first test parameters, and obtain the first operating data of the DC valve control system under test.

[0151] The second test module 300 is used to acquire the second test parameters, control the operation of the test platform according to the second test parameters, and obtain the second operating data of the DC valve control system under test.

[0152] The third test module 400 is used to acquire the third test parameters, control the operation of the test platform according to the third test parameters, and obtain the third operating data of the DC valve control system under test.

[0153] The judgment module 500 is used to determine whether the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency transmission system under test has passed the test, based on whether the first operating data, the second operating data, and the third operating data respectively meet the corresponding first judgment condition, the second judgment condition, and the third judgment condition.

[0154] It should be noted that the modules in the testing device for the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind-driven medium-frequency transmission system correspond to the steps of the testing method for the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind-driven medium-frequency transmission system. The steps of the testing method for the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind-driven medium-frequency transmission system have already been described in Embodiment 1, and will not be repeated in this embodiment. The testing device for the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind-driven medium-frequency transmission system utilizes a testing platform construction module, a first testing module, a second testing module, a third testing module, and a judgment module to test the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind-driven medium-frequency transmission system.

[0155] In one embodiment of this application, the first test module 200 includes a first test submodule, a second test submodule, a third test submodule, a fourth test submodule, and a fifth test submodule;

[0156] The first test submodule is used to control the test platform to run according to the first protection return setting and the first action setting of the first protection module of the backup main control screen in the first test parameters, and to obtain the first running information of the backup main control screen.

[0157] The second test submodule is used to determine that the DC valve control system under test is operating normally based on the first operating information. Then, it controls the test platform to operate according to the second protection return setting and the second action setting of the second protection module of the backup main control panel in the first test parameters, and obtains the second operating information of the backup main control panel.

[0158] The third test submodule is used to determine the normal operation of the DC valve control system under test based on the second operating information. If the system is operating normally, the protection return setpoints and action setpoints of the first protection module and the second protection module in the backup main control panel are restored. The test platform is controlled to operate based on the fourth protection return setpoint and the fourth action setpoint of the first protection module of the main control panel in the first test parameters, so as to obtain the third operating information of the main control panel.

[0159] The fourth test submodule is used to determine the normal operation of the DC valve control system under test based on the third operating information. Then, it controls the test platform to operate according to the fifth protection return setting and the fifth action setting of the second protection module of the main control panel in the first test parameters, and obtains the fourth operating information of the main control panel.

[0160] The fifth test submodule is used to determine the lockout trip of the DC valve control system under test based on the fourth operating information. If so, it restores the protection return setpoints and action setpoints of the first protection module and the second protection module in the main control panel, controls the DC valve control system under test to reset, and controls the test platform to run according to the rated power to obtain the fifth operating information of the bridge arm in the DC converter valve.

[0161] The first operating data includes first operating information, second operating information, third operating information, fourth operating information, and fifth operating information; the first protection return setting is less than the return threshold, and the first action setting is less than the rated parameter; the second protection return setting is less than the return threshold, and the second action setting is less than the rated parameter; the fourth protection return setting is less than the return threshold, and the fourth action setting is less than the rated parameter; the fifth protection return setting is less than the return threshold, and the fifth action setting is less than the rated parameter.

[0162] Example 3:

[0163] Figure 3 This is a schematic diagram of the terminal device described in an embodiment of this application.

[0164] like Figure 3 As shown, this application provides a terminal device, including a processor and a memory;

[0165] Memory is used to store program code and transfer the program code to the processor;

[0166] The processor is used to execute the above-mentioned test method for the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency transmission system according to the instructions in the program code.

[0167] It should be noted that the processor is used to execute the steps in the above-described embodiment of a test method for the effectiveness of DC valve-controlled bridge arm protection function in a marine wind-driven medium-frequency transmission system, according to the instructions in the program code. Alternatively, the processor may execute computer programs to implement the functions of each module / unit in the above-described system / device embodiments.

[0168] For example, a computer program can be divided into one or more modules / units, one or more of which are stored in memory and executed by a processor to complete this application. One or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in a terminal device.

[0169] Terminal devices can be computing devices such as desktop computers, laptops, handheld computers, and cloud servers. Terminal devices may include, but are not limited to, processors and memory. Those skilled in the art will understand that this does not constitute a limitation on the terminal device, which may include more or fewer components than illustrated, or combinations of certain components, or different components. For example, a terminal device may also include input / output devices, network access devices, buses, etc.

[0170] The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (dSICs), off-the-shelf programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor, etc.

[0171] Memory can be an internal storage unit of a terminal device, such as a hard drive or RAM. Memory can also be an external storage device, such as a plug-in hard drive, smart memory card (SMC), secure digital card (SD) card, or flash card. Furthermore, memory can include both internal and external storage units. Memory is used to store computer programs and other programs and data required by the terminal device. Memory can also be used to temporarily store data that has been output or will be output.

[0172] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0173] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, 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 an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0174] 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.

[0175] 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.

[0176] 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 to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0177] 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 the effectiveness of the DC valve-controlled bridge arm protection function in a marine wind-driven medium-frequency power transmission system, characterized in that, Includes the following steps: A test topology diagram of the connection between the DC converter valve and the DC valve control system under test, as well as the rated power of the DC converter valve, are obtained. A test platform is constructed based on the test topology diagram, and the test platform is controlled to operate according to the rated power to obtain the rated parameters of the bridge arm in the DC converter valve. The DC valve control system under test includes a primary main control panel and a backup main control panel connected to the DC converter valve and redundant with each other. Both the primary main control panel and the backup main control panel include the same and redundant first protection module, second protection module, and third protection module. Obtain the first test parameter, control the operation of the test platform according to the first test parameter, and obtain the first operating data of the DC valve control system under test; Obtain the second test parameter, control the operation of the test platform according to the second test parameter, and obtain the second operating data of the DC valve control system under test; Obtain the third test parameter, control the operation of the test platform according to the third test parameter, and obtain the third operating data of the DC valve control system under test; Based on whether the first operating data, the second operating data, and the third operating data respectively meet the corresponding first judgment condition, the second judgment condition, and the third judgment condition, it is determined whether the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency transmission system under test has passed the test.

2. The test method for the effectiveness of the DC valve-controlled bridge arm protection function in the offshore wind medium-frequency transmission system according to claim 1, characterized in that, The test platform is controlled to operate according to the first test parameters, and the first operating data of the DC valve control system under test is obtained, including: Based on the first protection return setting and the first action setting of the first protection module of the backup main control screen in the first test parameters, the test platform is controlled to operate, and the first operating information of the backup main control screen is obtained. If the DC valve control system under test is determined to be operating normally based on the first operating information, then the test platform is controlled to operate based on the second protection return setting and the second action setting of the second protection module of the backup main control panel in the first test parameters, thereby obtaining the second operating information of the backup main control panel; If the DC valve control system under test is determined to be operating normally based on the second operating information, then the protection return setpoints and action setpoints of the first protection module and the second protection module in the backup main control panel are restored, and the test platform is controlled to operate based on the fourth protection return setpoint and the fourth action setpoint of the first protection module of the main control panel in the first test parameters, thereby obtaining the third operating information of the main control panel; If the DC valve control system under test is determined to be operating normally based on the third operating information, then the test platform is controlled to operate according to the fifth protection return setting and the fifth action setting of the second protection module of the main control panel in the first test parameters, thereby obtaining the fourth operating information of the main control panel; If the DC valve control system under test is determined to be locked out and tripped based on the fourth operating information, the protection return setpoint and action setpoint of the first protection module and the second protection module in the main control panel are restored, the DC valve control system under test is controlled to reset, and the test platform is controlled to operate according to the rated power to obtain the fifth operating information of the bridge arm in the DC converter valve. The first operating data includes the first operating information, the second operating information, the third operating information, the fourth operating information, and the fifth operating information; the first protection return setting is less than the return threshold, and the first action setting is less than the rated parameter; the second protection return setting is less than the return threshold, and the second action setting is less than the rated parameter; the fourth protection return setting is less than the return threshold, and the fourth action setting is less than the rated parameter; the fifth protection return setting is less than the return threshold, and the fifth action setting is less than the rated parameter.

3. The test method for the effectiveness of the DC valve-controlled bridge arm protection function in the offshore wind medium-frequency transmission system according to claim 2, characterized in that, The first judgment condition includes: if the first operating information is that the first protection module of the backup main control panel is locked, and the second and third protection modules are not locked, and the backup main control panel does not output a lockout trip signal, then the DC valve control system under test is operating normally; if the second operating information is that the second protection module of the backup main control panel is locked and the backup main control panel does not output a lockout trip signal, then the DC valve control system under test is operating normally; if the third operating information is that the first protection module of the primary main control panel is locked, and the second and third protection modules are not locked, then the DC valve control system under test is operating normally. If none of the protection modules engage and the main control panel does not output a blocking trip signal, then the DC valve control system under test is operating normally. If the fourth operating information indicates that the second protection module of the main control panel engages and the main control panel outputs a blocking trip signal, then the DC valve control system under test is blocked and tripped. If the fifth operating information indicates that the arm current is equal to the rated arm current of the rated parameter or that the arm current rise rate is equal to the rated current rise rate of the rated parameter, then the first, second, and third protection modules of the main control panel and the backup control panel are all operating normally.

4. The test method for the effectiveness of the DC valve-controlled bridge arm protection function in the offshore wind medium-frequency transmission system according to claim 1, characterized in that, If the effectiveness of the overcurrent instantaneous trip protection function of the bridge arm in the DC valve-controlled system under test is to be tested, the second operating data of the DC valve-controlled system under test obtained by controlling the operation of the test platform according to the second test parameters includes: The test platform is controlled to operate according to the sixth protection return setting and the sixth action setting of the third protection module of the main control screen in the second test parameters, so as to obtain the sixth operation information of the main control screen; If the DC valve control system under test is determined to be operating normally based on the sixth operating information, then the test platform is controlled to operate according to the power disconnect command of the second protection module of the main control panel in the second test parameters, and the seventh operating information of the main control panel is obtained. If the DC valve control system under test is determined to be locked out based on the seventh operating information, then the backup main control panel is switched to the new main control panel according to the fault request switching command of the seventh operating information. The protection return setting and action setting of the third protection module in the main control panel before the switch are restored, and the power supply of the second protection module in the main control panel before the switch is restored. The DC valve control system under test is reset, and the test platform is controlled to run according to the rated power to obtain the eighth operating information of the bridge arm in the DC converter valve. or, If the effectiveness of the current rise rate protection function of the bridge arm in the DC valve-controlled system under test is to be tested, the second operating data of the DC valve-controlled system under test obtained by controlling the test platform according to the second test parameters includes: The test platform is controlled to operate according to the fifth protection return setting and the fifth action setting of the second protection module of the main control screen in the second test parameters, so as to obtain the ninth operation information of the main control screen; If the DC valve control system under test is determined to be operating normally based on the ninth operating information, then the test platform is controlled to operate according to the power disconnect command of the first protection module of the main control panel in the second test parameters, and the tenth operating information of the main control panel is obtained. If the DC valve control system under test is determined to be locked out based on the tenth operating information, then the backup main control panel is switched to the new main control panel according to the fault request switching command of the tenth operating information. The protection return setting and action setting of the second protection module in the main control panel before the switch are restored, and the power supply of the first protection module in the main control panel before the switch is restored. The DC valve control system under test is reset, and the test platform is controlled to operate according to the rated power to obtain the eleventh operating information of the bridge arm in the DC converter valve. Wherein, the second operating data includes the sixth operating information, the seventh operating information, and the eighth operating information; or the second operating data includes the ninth operating information, the tenth operating information, and the eleventh operating information; the sixth protection return setting is less than the return threshold, and the sixth action setting is less than the rated parameter; the fifth protection return setting is less than the return threshold, and the fifth action setting is less than the rated parameter.

5. The test method for the effectiveness of the DC valve-controlled bridge arm protection function in a marine wind-driven medium-frequency power transmission system according to claim 4, characterized in that, The second judgment condition includes: if the sixth operating information is that the third protection module of the main control panel is locked and the main control panel does not output a lockout trip signal, then the DC valve control system under test is operating normally; if the seventh operating information is that the main control panel outputs a fault request switching command and outputs a lockout trip signal, then the DC valve control system under test is locked and shut down; if the eighth operating information is that the bridge arm current is equal to the rated current of the bridge arm of the rated parameter, then only two of the first, second, and third protection modules of the main control panel can work normally and the main control panel and the backup main control panel have successfully switched over. or, The second judgment condition includes: if the ninth operating information is that the second protection module of the main control panel is locked and the main control panel does not output a lockout trip signal, then the DC valve control system under test is operating normally; if the tenth operating information is that the main control panel outputs a fault request switching command and outputs a lockout trip signal, then the DC valve control system under test is locked out; if the eleventh operating information is that the bridge arm current rise rate is equal to the rated current rise rate of the rated parameter, then only two of the first, second, and third protection modules of the main control panel can work normally, and the main control panel and the backup main control panel have successfully switched over.

6. The test method for the effectiveness of the DC valve-controlled bridge arm protection function in a marine wind-driven medium-frequency power transmission system according to claim 1, characterized in that, If the effectiveness of the overcurrent instantaneous trip protection function of the bridge arm in the DC valve-controlled system under test is to be tested, the test platform is controlled to operate according to the third test parameters, and the third operating data of the DC valve-controlled system under test is obtained, including: According to the power disconnection command of the first protection module of the backup main control screen and the disconnection command of the second protection module from the current measuring element of the DC converter valve in the third test parameters, the test platform is controlled to operate in sequence to obtain the twelfth operating information of the backup main control screen; Based on the twelfth operating information, it is determined that the DC valve control system under test executes the non-switching instruction. Then, based on the disconnection instruction of the first protection module of the main control panel and the current measurement element of the DC converter valve and the power disconnection instruction of the second protection module in the third test parameters, the test platform is controlled to operate in sequence to obtain the thirteenth operating information of the main control panel. Based on the thirteenth operating information, it is determined that the DC valve control system under test executes the non-switching instruction. Then, based on the exit instruction and switching instruction of the overcurrent instantaneous trip protection function of the third protection module of the main control panel in the third test parameter, the test platform is controlled to operate, and the fourteenth operating information is obtained. Based on the fourteenth operating information, it is determined that the DC valve control system under test is operating normally. Then, based on the third protection return setting and the third action setting of the third protection module of the main control panel after switching in the third test parameters, the test platform is controlled to operate, and the fifteenth operating information of the main control panel after switching is obtained. Based on the fifteenth operating information, if the DC valve control system under test is locked, then the protection return setting and action setting of the third protection module in the main control panel after the switch is restored, and the DC valve control system under test is reset. or, If the effectiveness of the current rise rate protection function of the bridge arm in the DC valve-controlled system under test is to be tested, the third operating data of the DC valve-controlled system under test obtained by controlling the test platform according to the third test parameters includes: According to the disconnection command of the second protection module of the backup main control screen and the current measurement element of the DC converter valve in the third test parameters, and the exit command of the current rise rate protection function of the third protection module, the test platform is controlled to operate in sequence to obtain the sixteenth operating information of the backup main control screen; Based on the sixteenth operating information, it is determined that the DC valve control system under test executes the non-switching instruction. Then, based on the disconnection instruction between the third protection module of the main control panel and the current measuring element of the DC converter valve and the power disconnection instruction of the first protection module in the third test parameters, the test platform is controlled to operate in sequence to obtain the seventeenth operating information of the main control panel. Based on the seventeenth operating information, it is determined that the DC valve control system under test executes the non-switching instruction. Then, based on the exit instruction and switching instruction of the current rise rate protection function of the second protection module of the main control panel in the third test parameters, the test platform is controlled to operate, and the eighteenth operating information is obtained. Based on the eighteenth operating information, it is determined that the DC valve control system under test is operating normally. Then, based on the first protection return setting and first action setting of the first protection module of the main control panel after switching in the third test parameters, the test platform is controlled to operate, and the nineteenth operating information of the main control panel after switching is obtained. Based on the nineteenth operating information, if the DC valve control system under test is locked, then the protection return setting and action setting of the first protection module in the main control panel after the switch is restored, and the DC valve control system under test is reset. The third operating data includes the twelfth, thirteenth, fourteenth, and fifteenth operating information, or the third operating data includes the sixteenth, seventeenth, eighteenth, and nineteenth operating information; the third protection return setting is less than the return threshold, and the third action setting is less than the rated current of the bridge arm of the rated parameter; the first protection return setting is less than the return threshold, and the first action setting is less than the rated current rise rate of the rated parameter; after switching, the primary control panel becomes the backup control panel.

7. The test method for the effectiveness of the DC valve-controlled bridge arm protection function in a marine wind-driven medium-frequency power transmission system according to claim 6, characterized in that, The third judgment condition includes: if the twelfth operating information is that the backup main control panel outputs a minor fault message, then the DC valve control system under test executes a no-switching instruction; if the thirteenth operating information is that the primary main control panel outputs a minor fault message, then the DC valve control system under test executes a no-switching instruction; if the fourteenth operating information is that the primary main control panel and the backup main control panel have successfully switched and the DC valve control system under test is unaffected, then the DC valve control system under test operates normally; if the fifteenth operating information is that the primary main control panel outputs a lockout trip signal after switching, then the DC valve control system under test is locked out and shut down. or, The third judgment condition includes: if the sixteenth operating information is a minor fault message output by the backup main control panel, the DC valve control system under test executes a no-switching instruction; if the seventeenth operating information is a minor fault message output by the primary main control panel, the DC valve control system under test executes a no-switching instruction; if the eighteenth operating information is a successful switch between the primary main control panel and the backup main control panel and the DC valve control system under test is unaffected, the DC valve control system under test operates normally; if the nineteenth operating information is a blocking trip signal output by the primary main control panel after the switch, the DC valve control system under test is blocked and shut down.

8. A testing device for the effectiveness of the DC valve-controlled bridge arm protection function in a marine wind-driven medium-frequency power transmission system, characterized in that, It includes a test platform construction module, a first test module, a second test module, a third test module, and a judgment module; The test platform construction module is used to obtain the test topology diagram of the connection between the DC converter valve and the DC valve control system under test, as well as the rated power of the DC converter valve. Based on the test topology diagram, a test platform is constructed, and the test platform is controlled to operate according to the rated power to obtain the rated parameters of the bridge arm in the DC converter valve. The DC valve control system under test includes a primary main control panel and a backup main control panel connected to the DC converter valve and redundant with each other. Both the primary and backup main control panels include the same and redundant first protection module, second protection module, and third protection module. The first test module is used to acquire the first test parameters, control the operation of the test platform according to the first test parameters, and obtain the first operating data of the DC valve control system under test; The second test module is used to acquire the second test parameters, control the operation of the test platform according to the second test parameters, and obtain the second operating data of the DC valve control system under test; The third test module is used to acquire the third test parameters, control the operation of the test platform according to the third test parameters, and obtain the third operating data of the DC valve control system under test. The judgment module is used to determine whether the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency transmission system under test has passed the test, based on whether the first operating data, the second operating data, and the third operating data respectively meet the corresponding first judgment condition, the second judgment condition, and the third judgment condition.

9. The testing device for the effectiveness of the DC valve-controlled bridge arm protection function in a marine wind-driven medium-frequency power transmission system according to claim 8, characterized in that, The first test module includes a first test submodule, a second test submodule, a third test submodule, a fourth test submodule, and a fifth test submodule; The first test submodule is used to control the operation of the test platform according to the first protection return setting and the first action setting of the first protection module of the backup main control screen in the first test parameters, so as to obtain the first operation information of the backup main control screen; The second test submodule is used to determine that the DC valve control system under test is operating normally based on the first operating information, and then control the test platform to operate according to the second protection return setting and the second action setting of the second protection module of the backup main control panel in the first test parameters, so as to obtain the second operating information of the backup main control panel; The third test submodule is used to determine that the DC valve control system under test is operating normally based on the second operating information. If so, it restores the protection return setpoints and action setpoints of the first protection module and the second protection module in the backup main control panel, and controls the test platform to operate based on the fourth protection return setpoint and the fourth action setpoint of the first protection module of the main control panel in the first test parameters, thereby obtaining the third operating information of the main control panel. The fourth test submodule is used to determine that the DC valve control system under test is operating normally based on the third operating information. Then, it controls the test platform to operate according to the fifth protection return setting and the fifth action setting of the second protection module of the main control panel in the first test parameters, and obtains the fourth operating information of the main control panel. The fifth test submodule is used to determine the lockout trip of the DC valve control system under test based on the fourth operating information, then restore the protection return set value and action set value of the first protection module and the second protection module in the main control panel, control the DC valve control system under test to reset, and control the test platform to operate according to the rated power to obtain the fifth operating information of the bridge arm in the DC converter valve; The first operating data includes the first operating information, the second operating information, the third operating information, the fourth operating information, and the fifth operating information; the first protection return setting is less than the return threshold, and the first action setting is less than the rated parameter; the second protection return setting is less than the return threshold, and the second action setting is less than the rated parameter; the fourth protection return setting is less than the return threshold, and the fourth action setting is less than the rated parameter. The fifth protection return setting is less than the return threshold, and the fifth action setting is less than the rated parameter.

10. A terminal device, characterized in that, Including the processor and memory; The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute, according to the instructions in the program code, the test method for the effectiveness of the DC valve-controlled bridge arm protection function of the offshore wind medium-frequency transmission system as described in any one of claims 1-7.

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