Method, device and equipment for testing effectiveness of protection function of direct-current valve-controlled bridge arm of sea wind intermediate-frequency power transmission system

Abstract

The invention relates to a method, a device and equipment for testing effectiveness of a protection function of a direct-current valve control bridge arm of a sea wind intermediate-frequency power transmission system, and the method comprises the steps: obtaining a test topological graph of the connection of a direct-current converter valve and a to-be-tested direct-current valve control system, and the rated power of the direct-current converter valve; constructing a test platform according to the test topological graph, controlling the test platform to operate according to the rated power, and obtaining rated parameters of a bridge arm in the DC converter valve; acquiring a first test parameter, a second test parameter and a third test parameter, and respectively controlling the test platform to operate according to the first test parameter, the second test parameter and the third test parameter to obtain first operation data, second operation data and third operation data of the direct current valve control system to be tested; and according to the first operation data, the second operation data and the third operation data, judging whether the effectiveness of the direct-current valve-controlled bridge arm protection function of the to-be-tested sea-wind intermediate-frequency power transmission system passes the test, thereby realizing the test of the effectiveness of the direct-current valve-controlled bridge arm protection function of the to-be-tested sea-wind intermediate-frequency power transmission system.

Description

Technical Field

[0001] The present application relates to the technical field of fault data processing of power transmission lines, and in particular to a method, device and equipment for testing the effectiveness of a DC valve-controlled bridge arm protection function of an offshore wind medium-frequency power transmission system. Background Art

[0002] Each flexible DC converter valve in the offshore wind medium frequency power transmission system 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 to verify the effectiveness of the arm overcurrent protection function and / or arm current rise rate protection function in the flexible DC valve control system when the actual measured value of the arm current of any arm of the flexible DC converter valve is abnormal and / or the actual measured value of the arm current rise rate is abnormal. Summary of the invention

[0004] The present application provides a method, device and equipment for testing the effectiveness of the protection function of a DC valve-controlled bridge arm of an offshore wind medium-frequency power transmission system, which is used to solve 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] In order to achieve the above objectives, this application provides the following technical solutions:

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

[0007] A test topology diagram of the connection between the DC converter valve and the DC valve control system to be tested and the rated power of the DC converter valve are obtained, a test platform is constructed according to the test topology diagram, and the operation of the test platform is controlled according to the rated power to obtain the rated parameters of the bridge arm in the DC converter valve; the DC valve control system to be tested includes a main control panel and a backup main control panel connected to the DC converter valve and redundant to each other, and the main control panel and the backup main control panel both include the same and mutually redundant first protection module, second protection module and third protection module;

[0008] Acquire a first test parameter, control the operation of the test platform according to the first test parameter, and obtain first operation data of the DC valve control system to be tested;

[0009] Acquire a second test parameter, control the operation of the test platform according to the second test parameter, and obtain second operation data of the DC valve control system to be tested;

[0010] Acquire a third test parameter, control the operation of the test platform according to the third test parameter, and obtain third operation data of the DC valve-controlled system to be tested;

[0011] According to whether the first operating data, the second operating data and the third operating data all meet the corresponding first judgment condition, the second judgment condition and the third judgment condition, it is judged whether the effectiveness of the DC valve-controlled bridge arm protection function of the tested sea breeze medium-frequency power transmission system has passed the test.

[0012] Preferably, controlling the test platform to run according to the first test parameter to obtain first operating data of the DC valve-controlled system to be tested includes:

[0013] Controlling the operation of the test platform according to the first protection return constant and the first action constant of the first protection module of the standby main control panel in the first test parameter to obtain first operation information of the standby main control panel;

[0014] According to the first operation information, it is judged that the DC valve control system to be tested is operating normally, and the test platform is controlled to operate according to the second protection return constant value and the second action constant value of the second protection module of the standby main control panel in the first test parameter to obtain the second operation information of the standby main control panel;

[0015] According to the second operation information, it is judged that the DC valve control system to be tested is operating normally, then the protection return setting value and the action setting value of the first protection module and the second protection module in the standby main control panel are restored, and the operation of the test platform is controlled according to the fourth protection return setting value and the fourth action setting value of the first protection module of the main main control panel in the first test parameter, so as to obtain the third operation information of the main main control panel;

[0016] If it is determined according to the third operation information that the DC valve control system to be tested operates normally, the test platform is controlled to operate according to the fifth protection return constant and the fifth action constant of the second protection module of the main control panel in the first test parameter to obtain fourth operation information of the main control panel;

[0017] According to the fourth operation information, it is determined that the DC valve control system to be tested is locked and tripped, then the protection return setting value and the action setting value of the first protection module and the second protection module in the main control panel are restored, the DC valve control system to be tested is controlled to reset, and the test platform is controlled to operate according to the rated power to obtain the fifth operation information of the bridge arm in the DC converter valve;

[0018] Among them, 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 constant is less than the return threshold, and the first action constant is less than the rated parameter; the second protection return constant is less than the return threshold, and the second action constant is less than the rated parameter; the fourth protection return constant is less than the return threshold, and the fourth action constant is less than the rated parameter; the fifth protection return constant is less than the return threshold, and the fifth action constant 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 standby main control panel is locked, the second protection module and the second protection module are not locked, and the standby main control panel does not output a locked trip signal, then the DC valve control system to be tested 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 locked trip signal, then the DC valve control system to be tested is operating normally; if the third operating information is that the first protection module of the active main control panel is locked, the second protection module and the second protection module are not locked, then the DC valve control system to be tested is operating normally. If the protection modules are not locked and the main control panel does not output a locked tripping signal, the DC valve control system to be tested operates normally; if the fourth operating information is that the second protection module of the main main control panel is locked and the main main control panel outputs a locked tripping signal, the DC valve control system to be tested is locked and tripped; if the fifth operating information is that the bridge arm current is equal to the bridge arm rated current of the rated parameter or the fifth operating information is that the bridge arm current rise rate is equal to the rated current rise rate of the rated parameter, the first protection module, the second protection module and the third protection module of the main main control panel and the standby main control panel can all work normally.

[0020] Preferably, if the effectiveness of the over-current speed cut-off protection function of the bridge arm in the DC valve-controlled system to be tested is tested, the second operating data of the DC valve-controlled system to be tested obtained by controlling the test platform to run according to the second test parameter includes:

[0021] Controlling the operation of the test platform according to the sixth protection return setting and the sixth action setting of the third protection module of the primary main control panel in the second test parameter to obtain sixth operation information of the primary main control panel;

[0022] According to the sixth operation information, it is determined that the DC valve control system to be tested is operating normally, and then the test platform is controlled to operate according to the power disconnection instruction of the second protection module of the main control panel in the second test parameter to obtain the seventh operation information of the main control panel;

[0023] According to the seventh operation information, it is determined that the DC valve control system to be tested is locked and stopped, then according to the fault request switching instruction of the seventh operation information, the standby main control panel is switched to a new main main control panel, the protection return setting value and the action setting value of the third protection module in the main main control panel before the switching are restored, and the power supply of the second protection module in the main main control panel before the switching is restored, the DC valve control system to be tested is controlled to reset, and the test platform is controlled to run according to the rated power, so as to obtain the eighth operation 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 of the DC valve-controlled system to be tested is tested, the second operating data of the DC valve-controlled system to be tested obtained by controlling the test platform to run according to the second test parameter includes:

[0026] Controlling the operation of the test platform according to the fifth protection return setting and the fifth action setting of the second protection module of the primary main control panel in the second test parameter to obtain ninth operation information of the primary main control panel;

[0027] If it is determined according to the ninth operation information that the DC valve control system to be tested is operating normally, the test platform is controlled to operate according to the power disconnection instruction of the first protection module of the main control panel in the second test parameter to obtain tenth operation information of the main control panel;

[0028] According to the tenth operation information, it is determined that the DC valve control system to be tested is locked and stopped, then according to the fault request switching instruction of the tenth operation information, the standby main control panel is switched to a new main main control panel, the protection return setting value and the action setting value of the second protection module in the main main control panel before the switching are restored, and the power supply of the first protection module in the main main control panel before the switching is restored, the DC valve control system to be tested is controlled to reset, and the test platform is controlled to run according to the rated power, so as to obtain the eleventh operation information of the bridge arm in the DC converter valve;

[0029] Among them, 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 constant is less than the return threshold, and the sixth action constant is less than the rated parameter; the fifth protection return constant is less than the return threshold, and the fifth action constant is less than the rated parameter.

[0030] Preferably, the second judgment condition includes: if the sixth operation information is that the third protection module of the active main control panel is locked and the active main control panel does not output a locking trip signal, the DC valve control system to be tested operates normally; if the seventh operation information is that the active main control panel outputs a fault request switching instruction and outputs a locking trip signal, the DC valve control system to be tested is locked and shut down; if the eighth operation information is that the bridge arm current is equal to the bridge arm rated current of the rated parameter, only two of the first protection module, the second protection module and the third protection module of the active main control panel can operate normally and the active main control panel and the standby main control panel are successfully switched for use;

[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 locked trip signal, then the DC valve control system to be tested operates normally; if the tenth operating information is that the main control panel outputs a fault request switching instruction and outputs a locked trip signal, then the DC valve control system to be tested is locked and shut down; 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 protection module, the second protection module and the third protection module of the main control panel can work normally and the main control panel and the standby control panel are successfully switched for use.

[0032] Preferably, if the effectiveness of the over-current speed cut-off protection function of the bridge arm in the DC valve-controlled system to be tested is tested, the test platform is controlled to run according to the third test parameter, and the third operating data of the DC valve-controlled system to be tested is obtained, including:

[0033] According to the power disconnection instruction of the first protection module of the standby main control panel and the disconnection instruction of the second protection module from the current measuring element of the DC converter valve in the third test parameter, the test platform is controlled to run in sequence to obtain the twelfth operation information of the standby main control panel;

[0034] According to the twelfth operation information, it is determined that the DC valve control system to be tested executes a non-switching instruction, and then the test platform is controlled to run in sequence according to the disconnection instruction of 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 parameter, to obtain the thirteenth operation information of the main control panel;

[0035] According to the thirteenth operation information, it is determined that the DC valve control system to be tested executes a non-switching instruction, and then the test platform is controlled to run according to the exit instruction and the switching instruction of the over-current speed cut-off protection function of the third protection module of the main control panel in the third test parameter, to obtain the fourteenth operation information;

[0036] According to the fourteenth operation information, it is judged that the DC valve control system to be tested is operating normally, and the test platform is controlled to operate according to the third protection return constant and the third action constant of the third protection module of the main control panel after switching in the third test parameter, to obtain the fifteenth operation information of the main control panel after switching;

[0037] If it is determined according to the fifteenth operation information that the DC valve control system to be tested is in locked operation, the protection return setting value and the action setting value of the third protection module in the main control panel after the switching are restored, and the DC valve control system to be tested is reset;

[0038] or,

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

[0040] According to the disconnection instruction of the second protection module of the standby main control panel and the current measuring element of the DC converter valve and the exit instruction of the current rise rate protection function of the third protection module in the third test parameter, the test platform is controlled to run in sequence to obtain the sixteenth operation information of the standby main control panel;

[0041] According to the sixteenth operation information, it is determined that the DC valve control system to be tested executes a non-switching instruction, then the test platform is controlled to operate in sequence according to the disconnection instruction of 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 parameter, to obtain the seventeenth operation information of the main control panel;

[0042] According to the seventeenth operation information, it is determined that the DC valve control system to be tested executes a non-switching instruction, and then the test platform is controlled to run according to the exit instruction and the switching instruction of the current rise rate protection function of the second protection module of the main control panel in the third test parameter to obtain the eighteenth operation information;

[0043] According to the eighteenth operation information, it is judged that the DC valve control system to be tested is operating normally, and the operation of the test platform is controlled according to the first protection return constant value and the first action constant value of the first protection module of the main control panel after switching in the third test parameter to obtain the nineteenth operation information of the main control panel after switching;

[0044] If it is determined according to the nineteenth operation information that the DC valve control system to be tested is in locked operation, the protection return setting value and the action setting value of the first protection module in the main control panel after the switching are restored, and the DC valve control system to be tested is reset;

[0045] Among them, the third operating data includes the twelfth operating information, the thirteenth operating information, the fourteenth operating information and the fifteenth operating information, or the third operating data includes the sixteenth operating information, the seventeenth operating information, the eighteenth operating information and the nineteenth operating information; the third protection return constant is less than the return threshold, and the third action constant is less than the rated current of the bridge arm of the rated parameter; the first protection return constant is less than the return threshold, and the first action constant is less than the rated current rise rate of the rated parameter; after switching, the main main control screen is the standby main control screen.

[0046] Preferably, the third judgment condition includes: if the twelfth operation information is that the standby main control panel outputs a minor fault message, the DC valve control system to be tested executes a no-switching instruction; if the thirteenth operation information is that the main main control panel outputs a minor fault message, the DC valve control system to be tested executes a no-switching instruction; if the fourteenth operation information is that the main main control panel and the standby main control panel are successfully switched and the DC valve control system to be tested is not disturbed, the DC valve control system to be tested operates normally; if the fifteenth operation information is that the output blocking trip signal of the main main control panel after switching, the DC valve control system to be tested is blocked and stopped;

[0047] or,

[0048] The third judgment condition includes: if the sixteenth operating information is that the backup main control panel outputs a minor fault message, the DC valve control system to be tested executes a no-switching instruction; if the seventeenth operating information is that the main main control panel outputs a minor fault message, the DC valve control system to be tested executes a no-switching instruction; if the eighteenth operating information is that the main main control panel and the backup main control panel are successfully switched and the DC valve control system to be tested is not disturbed, then the DC valve control system to be tested runs normally; if the nineteenth operating information is the output lockout tripping signal of the main main control panel after switching, then the DC valve control system to be tested is locked and stopped.

[0049] In yet another aspect, a test device for effectiveness of protection function of DC valve-controlled bridge arm of an offshore wind medium-frequency power transmission system is provided, comprising 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 a test topology diagram of the connection between the DC converter valve and the DC valve control system to be tested and the rated power of the DC converter valve, build a test platform according to 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 to be tested includes a main control panel and a backup main control panel connected to the DC converter valve and redundant to each other, and the main control panel and the backup main control panel both include the same and mutually redundant first protection module, second protection module and third protection module;

[0051] The first test module is used to obtain a first test parameter, control the operation of the test platform according to the first test parameter, and obtain first operation data of the DC valve control system to be tested;

[0052] The second test module is used to obtain a second test parameter, control the operation of the test platform according to the second test parameter, and obtain second operation data of the DC valve control system to be tested;

[0053] The third test module is used to obtain a third test parameter, control the operation of the test platform according to the third test parameter, and obtain third operation data of the DC valve-controlled system to be tested;

[0054] The judgment module is used to judge whether the effectiveness of the DC valve-controlled bridge arm protection function of the tested sea breeze medium-frequency power transmission system has passed the test based on whether the first operating data, the second operating data and the third operating data all 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 constant value and the first action constant value of the first protection module of the standby main control panel in the first test parameter, and obtain the first operation information of the standby main control panel;

[0057] The second test submodule is used to determine that the DC valve control system to be tested is operating normally according to the first operating information, and then control the operation of the test platform according to the second protection return constant and the second action constant of the second protection module of the standby main control panel in the first test parameter to obtain the second operating information of the standby main control panel;

[0058] The third test submodule is used to determine that the DC valve control system to be tested is operating normally according to the second operating information, then restore the protection return constant value and the action constant value of the first protection module and the second protection module in the standby main control panel, and control the operation of the test platform according to the fourth protection return constant value and the fourth action constant value of the first protection module of the main main control panel in the first test parameter, so as to obtain the third operating information of the main main control panel;

[0059] The fourth test submodule is used to determine that the DC valve control system to be tested is operating normally according to the third operating information, and then control the operation of the test platform according to the fifth protection return constant and the fifth action constant of the second protection module of the main control panel in the first test parameter to obtain the fourth operating information of the main control panel;

[0060] The fifth test submodule is used to determine that the DC valve control system to be tested is locked and tripped according to the fourth operation information, then restore the protection return setting value and the action setting value of the first protection module and the second protection module in the main control panel, control the reset of the DC valve control system to be tested, and control the operation of the test platform according to the rated power to obtain the fifth operation information of the bridge arm in the DC converter valve;

[0061] Among them, 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 constant is less than the return threshold, and the first action constant is less than the rated parameter; the second protection return constant is less than the return threshold, and the second action constant is less than the rated parameter; the fourth protection return constant is less than the return threshold, and the fourth action constant is less than the rated parameter; the fifth protection return constant is less than the return threshold, and the fifth action constant is less than the rated parameter.

[0062] In another aspect, a terminal device is provided, comprising a processor and a memory;

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

[0064] 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 sea breeze medium-frequency power transmission system according to the instructions in the program code.

[0065] The method, device and equipment for testing the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium-frequency power transmission system include the following steps: obtaining a test topology diagram of the connection between the DC converter valve and the DC valve-controlled system to be tested and the rated power of the DC converter valve, building a test platform according to the test topology diagram and controlling the operation of the test platform according to the rated power, and obtaining the rated parameters of the bridge arm of the DC converter valve; the DC valve-controlled system to be tested includes a main control panel and a backup main control panel connected to the DC converter valve and redundant to each other, and the main control panel and the backup main control panel both include the same and mutually redundant first protection module, second protection module and third protection module; obtaining the first Test parameters, control the operation of the test platform according to the first test parameters to obtain first operating data of the DC valve-controlled system to be tested; obtain second test parameters, control the operation of the test platform according to the second test parameters to obtain second operating data of the DC valve-controlled system to be tested; obtain third test parameters, control the operation of the test platform according to the third test parameters to obtain third operating data of the DC valve-controlled system to be tested; judge whether the effectiveness of the DC valve-controlled bridge arm protection function of the sea breeze medium-frequency power transmission system to be tested has passed the test according to whether the first operating data, the second operating data and the third operating data all meet the corresponding first judgment condition, the second judgment condition and the third judgment condition.

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

[0067] The method for testing the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system obtains test data on the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system to be tested by constructing a test platform and obtaining the first test parameter, the second test parameter and the third test parameter to control the operation of the test platform, thereby realizing the test of the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system to be tested, and solving the technical problem that the prior art lacks a method for testing the effectiveness of the protection function in the flexible DC valve-controlled system.

[0068] The test device for the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system realizes the test of the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system through a test platform construction module, a first test module, a second test module, a third test module and a judgment module. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0070] Figure 1A flowchart of the steps of a method for testing the effectiveness of the protection function of a DC valve-controlled bridge arm of a sea breeze medium-frequency power transmission system according to an embodiment of the present application;

[0071] Figure 2 A schematic diagram of a framework of a testing device for the effectiveness of the protection function of a DC valve-controlled bridge arm of a sea breeze medium-frequency power transmission system according to an embodiment of the present application;

[0072] Figure 3 A schematic diagram of a terminal device described in an embodiment of the present application. DETAILED DESCRIPTION

[0073] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described below are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0074] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0075] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood 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 instructions issued by the main control panel to each power module. At the same time, 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 the leakage detection, intelligent monitoring and recording of the DC converter valve.

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

[0078] The embodiments of the present application provide a method, device and equipment for testing the effectiveness of the protection function of the DC valve-controlled bridge arm of an offshore wind medium-frequency power 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.

[0079] Embodiment 1:

[0080] Figure 1 This is a flowchart of the steps of the method for testing the effectiveness of the DC valve-controlled bridge arm protection function of the sea breeze medium-frequency power transmission system described in an embodiment of the present application.

[0081] like Figure 1 As shown, the embodiment of the present application provides a method for testing the effectiveness of the protection function of a DC valve-controlled bridge arm of an offshore wind medium-frequency power transmission system, comprising the following steps:

[0082] S1. Obtain a test topology diagram of the connection between the DC converter valve and the DC valve control system to be tested and the rated power of the DC converter valve, build a test platform according to 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 to be tested includes a main control panel and a backup main control panel connected to the DC converter valve and redundant to each other, and the main control panel and the backup main control panel both include the same and mutually redundant first protection module, second protection module and third protection module.

[0083] It should be noted that in step S1, a test platform is constructed and the basis data for subsequent judgment is obtained 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 to the DC valve-controlled system to be tested, and the real-time simulator includes a simulation model of the DC converter valve. The test method for the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium-frequency power transmission system is based on the effectiveness of the DC valve-controlled bridge arm protection function of the sea breeze medium-frequency power transmission system to be tested to obtain the corresponding rated parameters. For example, if the effectiveness of the over-current speed-off 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 an embodiment of the present application, a DC converter valve is generally composed of six bridge arms, each bridge arm is respectively connected to three independent current measuring elements, and the three current measuring elements measure the instantaneous value Iarm of the bridge arm current flowing through the bridge arm. Taking a bridge arm denoted as AU as an example, the instantaneous value Iarm of the bridge arm current flowing through the bridge arm has three independent measured values ​​IarmAU1, IarmAU2 and IarmAU3 at any time.

[0085] In an embodiment of the present application, a single set of DC valve control system to be tested is jointly responsible for the control and protection of the DC converter valve by two sets of DC valve control master control panels A and B which are redundant to each other. During normal operation, generally any one of the two sets of DC valve control master control panels A and B is used as the main master control panel, and the remaining DC valve control master control panel is used as the backup master control panel. When the DC valve control system to be tested is operating normally, the main master control panel is responsible for the control and protection of the DC converter valve. Only the control protection signal sent by the main master control panel can be truly exported and actually executed by the DC converter valve, while the control protection signal sent by the backup master control panel cannot be exported and cannot be actually executed by the DC converter valve. If the main master control panel fails or the operator issues a master-slave switch command, the main master control panel will automatically change the duty status of this set to backup, and the previous backup master control panel will synchronously change the duty status of this set to primary.

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

[0087] In the embodiment of the present application, the arm current of any of the six arms in the DC converter valve includes three measured values, which are measured by three sets of independent current measuring elements and uploaded to the first protection module A-PRO1, the second protection module A-PRO2 and the third protection module A-PRO3 of the three arm current fast protection boards of the main main control panel of the DC valve control system to be tested, and the first protection module B-PRO1, the second protection module B-PRO2 and the third protection module B-PRO3 of the three arm current fast protection boards of the backup main control panel of the DC valve control system to be tested. The protection modules composed of the six arm current fast protection boards in the two sets of main control panels respectively calculate and analyze the received arm current measured values, but only the arm current fast protection action signals output by the three protection modules in the main main control panel can be truly exported.

[0088] It should be noted that, taking the bridge arm AU as an example where the bridge arm current is overcurrent, and the A set of DC valve control main control panel is used as the main control panel and the B set of DC valve control main control panel is used as the backup main control panel, the contents of the bridge arm overcurrent rapid-break protection function and the bridge arm current rise rate protection function in the DC valve control system to be tested include:

[0089] First, when any of the first protection module, the second protection module and the third protection module A / B-PRO1, A / B-PRO2, A / B-PRO3 in the main control panel or the standby main control panel detects that the bridge arm current sampling and uploading of the bridge arm current measured value IarmAU of the bridge arm AU continuously exceeds the set bridge arm overcurrent speed protection action setting value Iarm set And the duration t exceeds the set time threshold t set1 When the bridge arm current measured value IarmAU and the calculated value of the rise rate di / dtAU continuously exceed the set bridge arm current rise rate protection action setting value di / dt set And the duration t exceeds the set time threshold t set1 When the bridge arm current measured value IarmAU rises, the calculated value is di / dtAU=dIarmAU / dt, where dt is the sampling period of the bridge arm current sampling (usually 10us), and dIarmAU is the change of the bridge arm current measured value IarmAU within one sampling period.

[0090] Second, when any of the first, second and third protection modules A / B-PRO1, A / B-PRO2 and A / B-PRO3 in the main control panel or the standby main control panel detects that the bridge arm current sampling of the bridge arm AU and the bridge arm current actual value IarmAU uploaded to the protection module is continuously less than the set bridge arm overcurrent protection return value Iarm return And the duration t exceeds the set time threshold t set2 When the bridge arm current actual value IarmAU or the calculated value of the rise rate di / dtAU is continuously less than the set bridge arm current rise rate protection returns to the fixed value di / dt return And the duration t exceeds the set time threshold t set2 When the protection module stops 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 able to work normally, the main control panel detects that at least two groups of protection modules have issued action signals, and the main control panel should output a locking tripping signal, and the DC valve control system to be tested will be locked and stopped, and the message "bridge arm current over-current rate-breaking protection action of bridge arm AU is locked and tripped" or "bridge arm current rise rate protection action of bridge arm AU is locked and tripped" will be displayed on the background monitoring interface of the DC valve control system to be tested.

[0092] Fourth, when one of the first protection module A-PRO1, the second protection module A-PRO2 and the third protection module A-PRO3 inside the main main control panel has an abnormality and cannot work normally, the main main control panel detects that at least one group of protection modules has sent an action signal, and the main main control panel should output a lockout tripping signal, and the DC valve control system to be tested will be locked and stopped, and the message "bridge arm current over-current rate protection action of bridge arm AU is locked and tripped" or "bridge arm current rise rate protection action of bridge arm AU is locked and tripped" will be displayed on the background monitoring interface of the DC valve control system to be tested.

[0093] Fifth, when two of the protection modules among the first protection module A-PRO1, the second protection module A-PRO2 and the third protection module A-PRO3 inside the main control panel are abnormal and cannot work normally, the main control panel detects that one of the protection modules has sent an action signal, and the main control panel should output a locking tripping signal, and the DC valve control system to be tested will be locked and stopped, and the message "bridge arm current over-current rate protection action of bridge arm AU is locked and tripped" or "bridge arm current rise rate protection action of bridge arm AU is locked and tripped" will be displayed on the background monitoring interface of the DC valve control system to be tested.

[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 main control panel are abnormal and cannot work normally, the main main control panel issues a "fault request switch" to reduce the duty status of this set of DC valve-controlled main control panel from the main main control panel to the backup main control panel, and at the same time, the duty status of the backup DC valve-controlled main control panel is upgraded from the backup main control panel to the main main control panel.

[0095] Seventh, when 1 to 2 groups (excluding 3 groups) of the protection modules among the first protection module, the second protection module and the third protection module A / B-PRO1, A / B-PRO2 and A / B-PRO3 in the main main control panel or the backup main control panel are abnormal and cannot work normally, the main main control panel or the backup main control panel will report a "minor fault" message; if the main main control panel reports a minor fault, and the backup main control panel is still normal and does not report a minor fault or request switching due to the fault, the main and backup DC valve-controlled main control panels will switch at this time; if the main main control panel reports a minor fault, and the backup main control panel also reports a minor fault or reports a fault and requests switching, no switching will occur at this time; if the main main control panel reports a fault and requests switching, the main and backup DC valve-controlled main control panels will switch directly at this time; if the backup main control panel reports a minor fault or requests switching due to the fault, no switching will occur at this time.

[0096] S2. Obtain a first test parameter, control the operation of the test platform according to the first test parameter, and obtain first operation data of the DC valve control system to be tested.

[0097] It should be noted that, in step S2, the first test parameter is obtained and the test platform is controlled to operate according to the first test parameter, so as to conduct the first test on the effectiveness of the DC valve-controlled bridge arm protection function of the medium-frequency power transmission system under test. In this embodiment, the test of step S2 is to verify that the three protection modules of the main control panel and the standby control panel can work normally. If at least two of the three protection modules of the standby control panel are judged to be in action, the standby control panel cannot output a blocking trip signal; but if at least two of the three protection modules of the main control panel are judged to be in action, the main control panel should output a blocking trip signal.

[0098] S3. Obtain a second test parameter, control the operation of the test platform according to the second test parameter, and obtain second operation data of the DC valve-controlled system to be tested.

[0099] It should be noted that, in step S3, the second test parameter is obtained and the test platform is controlled to run according to the second test parameter, and the effectiveness of the DC valve-controlled bridge arm protection function of the sea breeze medium-frequency power transmission system to be tested is tested for the second time. In this embodiment, the test of step S3 is to verify that if only two of the three protection modules of the main control panel can work normally, if at least one of the two protection modules of the main control panel judges the action, the main control panel should output a locking trip signal at this time; it also verifies that if one or two of the three 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, the three protection modules of the standby control panel can all work normally, and the standby control panel does not report a minor fault, and the DC valve-controlled system to be tested should be able to successfully switch between the main control panel and the standby control panel.

[0100] S4. Obtain a third test parameter, control the operation of the test platform according to the third test parameter, and obtain third operation data of the DC valve-controlled system to be tested.

[0101] It should be noted that, in step S4, the third test parameter is obtained and the test platform is controlled to operate according to the third test parameter, so as to conduct a third test on the effectiveness of the DC valve-controlled bridge arm protection function of the tested sea breeze medium-frequency power transmission system. In this embodiment, the test of step S4 is to verify that if the three groups of protection modules of the main control panel are all faulty and cannot work normally, the main control panel should report an emergency fault and output a request switching instruction, and the DC valve-controlled system to be tested should be able to successfully switch between the main control panel and the backup control panel; it also verifies that if only one of the three groups of protection modules of the main control panel can work normally, if this group of protection modules judges to act, the main control panel should output a locking trip signal. Among them, the test order of steps S2 to S3 can be adjusted according to needs.

[0102] S5. Determine whether the effectiveness of the DC valve-controlled bridge arm protection function of the tested sea breeze medium-frequency power transmission system has passed the test based on whether the first operating data, the second operating data and the third operating data all meet the corresponding first judgment condition, the second judgment condition and the third judgment condition.

[0103] It should be noted that in step S5, the first operating data, the second operating data and the third operating data obtained from the tests in steps S2 to S4 all meet the corresponding first judgment condition, the second judgment condition and the third judgment condition, and it is judged that the effectiveness of the DC valve-controlled bridge arm protection function of the sea breeze medium-frequency power transmission system to be tested has passed the test.

[0104] The present application provides a method for testing the effectiveness of the protection function of a DC valve-controlled bridge arm of an offshore wind medium-frequency power transmission system, comprising the following steps: obtaining a test topology diagram of a DC converter valve connected to a DC valve-controlled system to be tested and the rated power of the DC converter valve, constructing a test platform according to the test topology diagram and controlling the operation of the test platform according to the rated power, and obtaining the rated parameters of the bridge arm of the DC converter valve; the DC valve-controlled system to be tested comprises a main control panel and a backup main control panel connected to the DC converter valve and redundant to each other, and both the main control panel and the backup main control panel comprise a first protection module, a second protection module and a third protection module that are identical and redundant to each other; obtaining the first test module; The method for testing the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system is to construct a test platform and obtain the test data of the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system to be tested by controlling the operation of the test platform according to the first test parameter, and obtaining the first operating data of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system to be tested; obtaining the second test parameter, controlling the operation of the test platform according to the second test parameter, and obtaining the second operating data of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system to be tested; and judging whether the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system to be tested has passed the test according to whether the first operating data, the second operating data and the third operating data all meet the corresponding first judgment condition, the second judgment condition and the third judgment condition. The method for testing the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system is to obtain the test data of the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system to be tested by constructing a test platform and controlling the operation of the test platform with the first test parameter, the second test parameter and the third test parameter, so as to test the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system to be tested, and solves the technical problem that the prior art lacks a method for testing the effectiveness of the protection function in the flexible DC valve-controlled system.

[0105] In one embodiment of the present application, controlling the test platform to run according to the first test parameter to obtain first operating data of the DC valve control system to be tested includes:

[0106] According to the first protection return constant value and the first action constant value of the first protection module of the standby main control panel in the first test parameter, the test platform is controlled to run, and the first operation information of the standby main control panel is obtained;

[0107] According to the first operation information, it is determined that the DC valve control system to be tested is operating normally, and the test platform is controlled to operate according to the second protection return constant value and the second action constant value of the second protection module of the standby main control panel in the first test parameter to obtain the second operation information of the standby main control panel;

[0108] If it is determined that the DC valve control system to be tested is operating normally according to the second operating information, the protection return setting value and the action setting value of the first protection module and the second protection module in the standby main control panel are restored, and the test platform is controlled to operate according to the fourth protection return setting value and the fourth action setting value of the first protection module of the main main control panel in the first test parameter, so as to obtain the third operating information of the main main control panel;

[0109] According to the third operation information, it is judged that the DC valve control system to be tested is operating normally, and the test platform is controlled to operate according to the fifth protection return constant and the fifth action constant of the second protection module of the main control panel in the first test parameter to obtain the fourth operation information of the main control panel;

[0110] According to the fourth operation information, it is determined that the DC valve control system to be tested is locked and tripped, then the protection return setting value and the action setting value of the first protection module and the second protection module in the main control panel are restored, the DC valve control system to be tested is controlled to reset, and the test platform is operated according to the rated power control to obtain the fifth operation information of the bridge arm in the DC converter valve;

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

[0112] The first judgment condition includes: if the first operation information is that the first protection module of the standby main control panel is locked, the second protection module and the second protection module are not locked, and the standby main control panel does not output a locked trip signal, then the DC valve control system to be tested is operating normally; if the second operation 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 locked trip signal, then the DC valve control system to be tested is operating normally; if the third operation information is that the first protection module of the main main control panel is locked, the second protection module and the second protection module are not locked action, and the main control panel does not output a locking tripping signal, the DC valve control system to be tested operates normally; if the fourth operation information is that the second protection module of the main main control panel is locked and the main main control panel outputs a locking tripping signal, the DC valve control system to be tested is locked and tripped; if the fifth operation information is that the bridge arm current is equal to the rated current of the bridge arm of the rated parameters or the fifth operation information is that the bridge arm current rise rate is equal to the rated current rise rate of the rated parameters, the first protection module, the second protection module and the third protection module of the main main control panel and the standby main control panel can all work normally.

[0113] It should be noted that if the effectiveness of the over-current speed-off protection function of the bridge arm is tested, the protection return setting value is the over-current speed-off protection return setting value Iarm return , the corresponding return threshold can be 10A, and the action setting value is the over-current speed cut-off protection action setting value Iarm set , the corresponding rated parameter is the bridge arm rated current Iarm 额定 If the effectiveness of the bridge arm current rise rate protection function is tested, the protection return value is the bridge arm current rise rate protection return value di / dt return , the corresponding return threshold can be 0.1A / us, and the action setting value is the over-current speed cut-off protection action setting value Iarm set The corresponding rated parameter is the bridge arm current rise rate protection action setting di / dt set .

[0114] In one embodiment of the present application, if the effectiveness of the over-current speed cut-off protection function of the bridge arm in the DC valve-controlled system to be tested is tested, the second operating data of the DC valve-controlled system to be tested obtained by controlling the test platform to run according to the second test parameter includes:

[0115] The test platform is controlled to run according to the sixth protection return setting value and the sixth action setting value of the third protection module of the main control panel in the second test parameter, so as to obtain the sixth operation information of the main control panel;

[0116] According to the sixth operation information, it is determined that the DC valve control system to be tested is operating normally, and the test platform is controlled to operate according to the power disconnection instruction of the second protection module of the main control panel in the second test parameter to obtain the seventh operation information of the main control panel;

[0117] If it is determined according to the seventh operation information that the DC valve control system to be tested is locked and out of operation, the standby main control panel is switched to a new main main control panel according to the fault request switching instruction of the seventh operation information, the protection return setting value and the action setting value of the third protection module in the main main control panel before the switching are restored, and the power supply of the second protection module in the main main control panel before the switching is restored, the DC valve control system to be tested is controlled to reset, and the test platform is operated according to the rated power control, so as to obtain the eighth operation 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-controlled system to be tested is tested, the second operating data of the DC valve-controlled system to be tested obtained by controlling the test platform to run according to the second test parameter includes:

[0120] According to the fifth protection return setting value and the fifth action setting value of the second protection module of the main control panel in the second test parameter, the test platform is controlled to run, and the ninth operation information of the main control panel is obtained;

[0121] According to the ninth operation information, it is judged that the DC valve control system to be tested is operating normally, and the test platform is controlled to operate according to the power disconnection instruction of the first protection module of the main control panel in the second test parameter to obtain the tenth operation information of the main control panel;

[0122] If it is determined that the DC valve control system to be tested is locked and out of operation according to the tenth operation information, the standby main control panel is switched to a new main main control panel according to the fault request switching instruction of the tenth operation information, the protection return setting value and the action setting value of the second protection module in the main main control panel before the switching are restored, and the power supply of the first protection module in the main main control panel before the switching is restored, the DC valve control system to be tested is controlled to reset, and the test platform is operated according to the rated power control, and the eleventh operation information of the bridge arm in the DC converter valve is obtained;

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

[0124] The second judgment condition includes: if the sixth operation information is that the third protection module of the main main control panel is locked and the main main control panel does not output a locking trip signal, the DC valve control system to be tested is operating normally; if the seventh operation information is that the main main control panel outputs a fault request switching instruction and outputs a locking trip signal, the DC valve control system to be tested is locked and stopped; if the eighth operation information is that the bridge arm current is equal to the rated current of the bridge arm of the rated parameter, only two of the first protection module, the second protection module and the third protection module of the main main control panel can work normally and the main main control panel and the standby main control panel are successfully switched and used;

[0125] or,

[0126] The second judgment condition includes: if the ninth operating information is that the second protection module of the main main control panel is locked and the main main control panel does not output a locked tripping signal, the DC valve control system to be tested operates normally; if the tenth operating information is that the main main control panel outputs a fault request switching instruction and outputs a locked tripping signal, the DC valve control system to be tested is locked and stopped; 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 protection module, the second protection module and the third protection module of the main main control panel can work normally and the main main control panel and the backup main control panel are successfully switched and used.

[0127] It should be noted that if the effectiveness of the over-current speed cut-off protection function of the bridge arm is tested, the DC valve control system to be tested is judged to be operating normally according to the sixth operating information, and the power supply of the second protection module of the main control panel is cut off. The main control panel reports a minor fault and requests switching. The main control panel should output a locking trip signal, and the DC valve control system to be tested is locked 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 constant value is returned. The power supply of the second protection module of the original main control panel is restored, the DC valve control system to be tested is reset, and the test platform is re-controlled to run at the rated power. At this time, the bridge arm current value is Iarm 额定 , it means that the second test of the effectiveness of the over-current rate-off protection function of the bridge arm in the DC valve control system to be tested is completed. If the effectiveness test of the current rise rate protection function of the bridge arm is performed, it is judged that the DC valve control system to be tested is operating normally according to the ninth operation information, and the power supply of the first protection module of the main control panel is cut off. The main control panel reports a minor fault and requests switching. The main control panel should output a locking trip signal, and the DC valve control system to be tested is locked and stopped. The switching between the main control panel and the backup control panel is successful; after that, the protection action of the second protection module of the original main control panel is restored and the fixed value is returned, the power supply of the first protection module of the original main control panel is restored, the DC valve control system to be tested is reset, and the test platform is re-operated according to the rated power control. At this time, the calculated value of the rise rate of the actual measured value of the bridge arm current is di / dt set, it means that the second test on the effectiveness of the current rise rate protection function of the bridge arm in the DC valve-controlled system to be tested is completed.

[0128] In one embodiment of the present application, if the effectiveness of the over-current speed cut-off protection function of the bridge arm in the DC valve-controlled system to be tested is tested, the test platform is controlled to run according to the third test parameter, and the third operating data of the DC valve-controlled system to be tested is obtained, including:

[0129] According to the power disconnection instruction of the first protection module of the standby main control panel and the disconnection instruction of the second protection module connected to the current measuring element of the DC converter valve in the third test parameter, the test platform is controlled to run in sequence to obtain the twelfth operation information of the standby main control panel;

[0130] According to the twelfth operation information, it is determined that the DC valve control system to be tested executes the non-switching instruction, and then the test platform is controlled to operate in sequence according to the disconnection instruction of the first protection module of the main control panel and the power disconnection instruction of the second protection module in the third test parameter, to obtain the thirteenth operation information of the main control panel;

[0131] According to the thirteenth operation information, it is determined that the DC valve control system to be tested executes the non-switching instruction, and then the test platform is controlled to operate according to the exit instruction and the switching instruction of the over-current speed cut-off protection function of the third protection module of the main control panel in the third test parameter, to obtain the fourteenth operation information;

[0132] According to the fourteenth operation information, it is judged that the DC valve control system to be tested is operating normally, and the test platform is controlled to operate according to the third protection return constant value and the third action constant value of the third protection module of the main control panel after switching in the third test parameter, so as to obtain the fifteenth operation information of the main control panel after switching;

[0133] According to the fifteenth operation information, it is determined that the DC valve control system to be tested is locked and in operation, then the protection return setting value and the action setting value of the third protection module in the main control panel after the switch are restored, and the DC valve control system to be tested is reset;

[0134] or,

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

[0136] According to the disconnection instruction of the second protection module of the standby main control panel and the current measuring element of the DC converter valve and the exit instruction of the current rise rate protection function of the third protection module in the third test parameter, the test platform is controlled to run in sequence, and the sixteenth operation information of the standby main control panel is obtained;

[0137] According to the sixteenth operation information, it is determined that the DC valve control system to be tested executes the non-switching instruction, then the test platform is controlled to operate in sequence according to the disconnection instruction of 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 parameter, and the seventeenth operation information of the main control panel is obtained;

[0138] According to the seventeenth operation information, it is determined that the DC valve control system to be tested executes the non-switching instruction, and the test platform is controlled to operate according to the exit instruction and the switching instruction of the current rise rate protection function of the second protection module of the main control panel in the third test parameter, to obtain the eighteenth operation information;

[0139] According to the eighteenth operation information, it is judged that the DC valve control system to be tested is operating normally, and the test platform is controlled to operate according to the first protection return constant value and the first action constant value of the first protection module of the main control panel after switching in the third test parameter, to obtain the nineteenth operation information of the main control panel after switching;

[0140] If the DC valve control system to be tested is locked and running according to the nineteenth operation information, the protection return setting value and the action setting value of the first protection module in the main control panel after the switchover are restored, and the DC valve control system to be tested is reset;

[0141] The third operation data includes the twelfth operation information, the thirteenth operation information, the fourteenth operation information and the fifteenth operation information, or the third operation data includes the sixteenth operation information, the seventeenth operation information, the eighteenth operation information and the nineteenth operation information; the third protection return constant is less than the return threshold, and the third action constant is less than the rated current of the bridge arm of the rated parameters; the first protection return constant is less than the return threshold, and the first action constant is less than the rated current rise rate of the rated parameters; after switching, the main control screen is the standby main control screen;

[0142] The third judgment condition includes: if the twelfth operation information is that the standby main control panel outputs a minor fault message, the DC valve control system to be tested executes a no-switching instruction; if the thirteenth operation information is that the main main control panel outputs a minor fault message, the DC valve control system to be tested executes a no-switching instruction; if the fourteenth operation information is that the main main control panel and the standby main control panel are successfully switched and the DC valve control system to be tested is not disturbed, the DC valve control system to be tested operates normally; if the fifteenth operation information is that the output blocking trip signal of the main main control panel after switching, the DC valve control system to be tested is blocked and stopped;

[0143] or,

[0144] The third judgment condition includes: if the sixteenth operation information is that the backup main control panel outputs a minor fault message, the DC valve control system to be tested executes a no-switching instruction; if the seventeenth operation information is that the main main control panel outputs a minor fault message, the DC valve control system to be tested executes a no-switching instruction; if the eighteenth operation information is that the main main control panel and the backup main control panel are successfully switched and there is no disturbance in the DC valve control system to be tested, the DC valve control system to be tested operates normally; if the nineteenth operation information is the output lockout tripping signal of the main main control panel after switching, the DC valve control system to be tested is locked and stopped.

[0145] It should be noted that if the effectiveness of the over-current speed-off protection function of the bridge arm is tested, first cut off the power supply of the first protection module of the standby main control screen, and then unplug the transmission optical fiber of the second protection module of the standby main control screen that receives the actual value of the bridge arm current. The standby main control screen reports a minor fault but does not switch; then, unplug the transmission optical fiber of the first protection module of the main main control screen that receives the actual value of the bridge arm current, and then disconnect the power supply of the second protection module of the main main control screen. The main main control screen reports a minor fault but does not switch, and exits the over-current speed-off protection function of the bridge arm of the third protection module of the main main control screen in the background interface of the DC valve control system to be tested. The main main control screen correctly switches to the standby main control screen, and the standby main control screen synchronously switches to the main main control screen. The DC valve control system to be tested continues to operate normally without disturbance; secondly, the over-current speed-off protection of the bridge arm of the third protection module of the DC valve control main control screen (i.e., the original standby main control screen) that becomes the main after switching returns to the constant value Iarm return Less than 10A, action setting Iarm set Smaller than Iarm 额定, the DC valve control main control panel that becomes the main one after switching (i.e. the original standby main control panel) outputs a lockout tripping signal, and the DC valve control system to be tested is locked and shut down; finally, the protection action and return setting of the third protection module of the DC valve control main control panel that becomes the main one after switching (i.e. the original standby main control panel) are restored, all power supplies, optical fibers, and function enables are restored, and the DC valve control system to be tested is reset. If the effectiveness of the bridge arm current rise rate protection function is tested, first unplug the transmission optical fiber that receives the actual bridge arm current value of the second protection module of the standby main control screen, then exit the bridge arm current rise rate protection function of the third protection module of the standby main control screen in the background interface of the DC valve control system to be tested, and the standby main control screen reports a minor fault but does not switch; then, unplug the transmission optical fiber that receives the actual bridge arm current value of the third protection module of the main main control screen, and then disconnect the power supply of the first protection module of the main main control screen, the main main control screen reports a minor fault but does not switch, and exit the bridge arm current rise rate protection function of the second protection module of the main main control screen in the background interface of the DC valve control system to be tested, the main main control screen correctly switches to the standby main control screen, and the standby main control screen synchronously switches to the main main control screen, and the DC valve control system to be tested continues to operate normally without disturbance; secondly, the bridge arm current rise rate protection of the first protection module of the DC valve control main control screen (i.e., the original standby main control screen) that becomes the main after switching returns to the fixed value di / dt return Less than 0.1A / us, action setting di / dt set Less than di / dt 额定 , the DC valve control main control panel that becomes the main one after switching (that is, the original standby main control panel) outputs a lockout tripping signal, and the DC valve control system to be tested is locked and shut down; finally, the protection action and return setting of the first protection module of the DC valve control main control panel that becomes the main one after switching (that is, the original standby main control panel) are restored, all power supplies, optical fibers, and function enables are restored, and the DC valve control system to be tested is reset.

[0146] Embodiment 2:

[0147] Figure 2 A schematic diagram of the framework of a testing device for the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium-frequency power transmission system described in an embodiment of the present application.

[0148] like Figure 2 As shown, the embodiment of the present application provides a testing device for the effectiveness of the protection function of a DC valve-controlled bridge arm of an offshore wind medium-frequency power transmission system, comprising a testing platform building module 100, a first testing module 200, a second testing module 300, a third testing module 400 and a judging module 500;

[0149] The test platform construction module 100 is used to obtain a test topology diagram of the connection between the DC converter valve and the DC valve control system to be tested and the rated power of the DC converter valve, build a test platform according to 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 to be tested includes a main control panel and a backup main control panel connected to the DC converter valve and redundant to each other, and the main control panel and the backup main control panel both include the same and mutually redundant first protection module, second protection module and third protection module;

[0150] The first test module 200 is used to obtain a first test parameter, control the operation of the test platform according to the first test parameter, and obtain first operation data of the DC valve control system to be tested;

[0151] The second test module 300 is used to obtain a second test parameter, control the operation of the test platform according to the second test parameter, and obtain second operation data of the DC valve control system to be tested;

[0152] The third test module 400 is used to obtain a third test parameter, control the operation of the test platform according to the third test parameter, and obtain third operation data of the DC valve control system to be tested;

[0153] The judgment module 500 is used to judge whether the effectiveness of the DC valve-controlled bridge arm protection function of the tested sea breeze medium-frequency power transmission system has passed the test according to whether the first operating data, the second operating data and the third operating data all meet the corresponding first judgment condition, the second judgment condition and the third judgment condition.

[0154] It should be noted that the content of the module in the test device for the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system corresponds to the step content of the test method for the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system. The step content of the test method for the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system has been described in Example 1, and the content of the module in the test device for the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system will not be repeated in this embodiment. The test device for the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system realizes the test of the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium frequency power transmission system through the test platform construction module, the first test module, the second test module, the third test module and the judgment module.

[0155] In one embodiment of the present 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 operation of the test platform according to the first protection return constant value and the first action constant value of the first protection module of the standby main control panel in the first test parameter, and obtain the first operation information of the standby main control panel;

[0157] The second test submodule is used to determine that the DC valve control system to be tested is operating normally according to the first operating information, and then control the operation of the test platform according to the second protection return constant and the second action constant of the second protection module of the standby main control panel in the first test parameter to obtain the second operating information of the standby main control panel;

[0158] The third test submodule is used to determine that the DC valve control system to be tested is operating normally according to the second operating information, and then restore the protection return constant value and the action constant value of the first protection module and the second protection module in the standby main control panel, and control the operation of the test platform according to the fourth protection return constant value and the fourth action constant value of the first protection module of the main main control panel in the first test parameter, so as to obtain the third operating information of the main main control panel;

[0159] The fourth test submodule is used to determine that the DC valve control system to be tested is operating normally according to the third operating information, and then control the operation of the test platform according to the fifth protection return constant and the fifth action constant of the second protection module of the main control panel in the first test parameter to obtain the fourth operating information of the main control panel;

[0160] The fifth test submodule is used to determine that the DC valve control system to be tested is locked and tripped according to the fourth operation information, then restore the protection return setting value and the action setting value of the first protection module and the second protection module in the main control panel, control the reset of the DC valve control system to be tested, and control the operation of the test platform according to the rated power to obtain the fifth operation information of the bridge arm in the DC converter valve;

[0161] Among them, 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 constant is less than the return threshold, and the first action constant is less than the rated parameter; the second protection return constant is less than the return threshold, and the second action constant is less than the rated parameter; the fourth protection return constant is less than the return threshold, and the fourth action constant is less than the rated parameter; the fifth protection return constant is less than the return threshold, and the fifth action constant is less than the rated parameter.

[0162] Embodiment three:

[0163] Figure 3 A schematic diagram of a terminal device described in an embodiment of the present application.

[0164] like Figure 3 As shown, an embodiment of the present application provides a terminal device, including a processor and a memory;

[0165] A memory, used for storing program codes and transmitting the program codes to a 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 sea breeze medium-frequency power 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-mentioned embodiment of a method for testing the effectiveness of the protection function of the DC valve-controlled bridge arm of an offshore wind medium-frequency power transmission system according to the instructions in the program code. Alternatively, the processor implements the functions of each module / unit in the above-mentioned system / device embodiments when executing the computer program.

[0168] Exemplarily, the computer program may be divided into one or more modules / units, one or more modules / units are stored in a memory and executed by a processor to complete the present application. One or more modules / units may be a series of computer program instruction segments capable of completing a specific function, and the instruction segments are used to describe the execution process of the computer program in a terminal device.

[0169] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that this does not constitute a limitation on the terminal device, and may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the terminal device may also include input and output devices, network access devices, buses, etc.

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

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

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

[0173] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0174] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0175] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0176] If the integrated unit is implemented in the form of 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 the present application is essentially 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. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0177] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for testing the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium-frequency power transmission system, characterized in that: The following steps are involved: A test topology diagram of the connection between the DC converter valve and the DC valve control system to be tested and the rated power of the DC converter valve are obtained, a test platform is constructed according to the test topology diagram, and the operation of the test platform is controlled according to the rated power to obtain the rated parameters of the bridge arm in the DC converter valve; the DC valve control system to be tested includes a main control panel and a backup main control panel connected to the DC converter valve and redundant to each other, and the main control panel and the backup main control panel both include the same and mutually redundant first protection module, second protection module and third protection module; Acquire a first test parameter, control the operation of the test platform according to the first test parameter, and obtain first operation data of the DC valve control system to be tested; Acquire a second test parameter, control the operation of the test platform according to the second test parameter, and obtain second operation data of the DC valve control system to be tested; Acquire a third test parameter, control the operation of the test platform according to the third test parameter, and obtain third operation data of the DC valve-controlled system to be tested; According to whether the first operating data, the second operating data and the third operating data all meet the corresponding first judgment condition, the second judgment condition and the third judgment condition, it is judged whether the effectiveness of the DC valve-controlled bridge arm protection function of the tested sea breeze medium-frequency power transmission system has passed the test.

2. The method for testing the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium-frequency power transmission system according to claim 1 is characterized in that: Controlling the test platform to run according to the first test parameter to obtain first operating data of the DC valve control system to be tested includes: Controlling the operation of the test platform according to the first protection return constant and the first action constant of the first protection module of the standby main control panel in the first test parameter to obtain first operation information of the standby main control panel; According to the first operation information, it is judged that the DC valve control system to be tested is operating normally, and the test platform is controlled to operate according to the second protection return constant value and the second action constant value of the second protection module of the standby main control panel in the first test parameter to obtain the second operation information of the standby main control panel; According to the second operation information, it is judged that the DC valve control system to be tested is operating normally, then the protection return setting value and the action setting value of the first protection module and the second protection module in the standby main control panel are restored, and the operation of the test platform is controlled according to the fourth protection return setting value and the fourth action setting value of the first protection module of the main main control panel in the first test parameter, so as to obtain the third operation information of the main main control panel; If it is determined according to the third operation information that the DC valve control system to be tested operates normally, the test platform is controlled to operate according to the fifth protection return constant and the fifth action constant of the second protection module of the main control panel in the first test parameter to obtain fourth operation information of the main control panel; According to the fourth operation information, it is determined that the DC valve control system to be tested is locked and tripped, then the protection return setting value and the action setting value of the first protection module and the second protection module in the main control panel are restored, the DC valve control system to be tested is controlled to reset, and the test platform is controlled to operate according to the rated power to obtain the fifth operation information of the bridge arm in the DC converter valve; Among them, 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 constant is less than the return threshold, and the first action constant is less than the rated parameter; the second protection return constant is less than the return threshold, and the second action constant is less than the rated parameter; the fourth protection return constant is less than the return threshold, and the fourth action constant is less than the rated parameter; the fifth protection return constant is less than the return threshold, and the fifth action constant is less than the rated parameter.

3. The method for testing the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium-frequency power transmission system according to claim 2 is characterized in that: The first judgment condition includes: if the first operation information is that the first protection module of the standby main control panel is locked, the second protection module and the second protection module are not locked, and the standby main control panel does not output a locking trip signal, then the DC valve control system to be tested is operating normally; if the second operation 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 locking trip signal, then the DC valve control system to be tested is operating normally; if the third operation information is that the first protection module of the active main control panel is locked, the second protection module and the second protection module are not locked, then the DC valve control system to be tested is operating normally. If none of the groups are locked and the main control panel does not output a locked trip signal, the DC valve control system to be tested operates normally; if the fourth operating information is that the second protection module of the main main control panel is locked and the main main control panel outputs a locked trip signal, the DC valve control system to be tested is locked and tripped; if the fifth operating information is that the bridge arm current is equal to the bridge arm rated current of the rated parameter or the fifth operating information is that the bridge arm current rise rate is equal to the rated current rise rate of the rated parameter, the first protection module, the second protection module and the third protection module of the main main control panel and the standby main control panel can all work normally.

4. The method for testing the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium-frequency power transmission system according to claim 1 is characterized in that: If the effectiveness of the over-current speed cut-off protection function of the bridge arm of the DC valve-controlled system to be tested is tested, the second operating data of the DC valve-controlled system to be tested obtained by controlling the test platform to run according to the second test parameter includes: Controlling the operation of the test platform according to the sixth protection return setting and the sixth action setting of the third protection module of the primary main control panel in the second test parameter to obtain sixth operation information of the primary main control panel; According to the sixth operation information, it is determined that the DC valve control system to be tested is operating normally, and then the test platform is controlled to operate according to the power disconnection instruction of the second protection module of the main control panel in the second test parameter to obtain the seventh operation information of the main control panel; According to the seventh operation information, it is determined that the DC valve control system to be tested is locked and stopped, then according to the fault request switching instruction of the seventh operation information, the standby main control panel is switched to a new main main control panel, the protection return setting value and the action setting value of the third protection module in the main main control panel before the switching are restored, and the power supply of the second protection module in the main main control panel before the switching is restored, the DC valve control system to be tested is controlled to reset, and the test platform is controlled to run according to the rated power, so as to obtain the eighth operation 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 of the DC valve-controlled system to be tested is tested, the second operating data of the DC valve-controlled system to be tested obtained by controlling the test platform to run according to the second test parameter includes: Controlling the operation of the test platform according to the fifth protection return setting and the fifth action setting of the second protection module of the primary main control panel in the second test parameter to obtain ninth operation information of the primary main control panel; If it is determined according to the ninth operation information that the DC valve control system to be tested is operating normally, the test platform is controlled to operate according to the power disconnection instruction of the first protection module of the main control panel in the second test parameter to obtain tenth operation information of the main control panel; According to the tenth operation information, it is determined that the DC valve control system to be tested is locked and stopped, then according to the fault request switching instruction of the tenth operation information, the standby main control panel is switched to a new main main control panel, the protection return setting value and the action setting value of the second protection module in the main main control panel before the switching are restored, and the power supply of the first protection module in the main main control panel before the switching is restored, the DC valve control system to be tested is controlled to reset, and the test platform is controlled to run according to the rated power, so as to obtain the eleventh operation information of the bridge arm in the DC converter valve; Among them, 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 constant is less than the return threshold, and the sixth action constant is less than the rated parameter; the fifth protection return constant is less than the return threshold, and the fifth action constant is less than the rated parameter.

5. The method for testing the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium-frequency power transmission system according to claim 4 is characterized in that: The second judgment condition includes: if the sixth operation information is that the third protection module of the active main control panel is locked and the active main control panel does not output a locking trip signal, the DC valve control system to be tested operates normally; if the seventh operation information is that the active main control panel outputs a fault request switching instruction and outputs a locking trip signal, the DC valve control system to be tested is locked and shut down; if the eighth operation information is that the bridge arm current is equal to the bridge arm rated current of the rated parameter, only two of the first protection module, the second protection module and the third protection module of the active main control panel can operate normally and the active main control panel and the standby main control panel are successfully switched for use; 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 locked trip signal, then the DC valve control system to be tested operates normally; if the tenth operating information is that the main control panel outputs a fault request switching instruction and outputs a locked trip signal, then the DC valve control system to be tested is locked and shut down; 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 protection module, the second protection module and the third protection module of the main control panel can work normally and the main control panel and the standby control panel are successfully switched for use.

6. The method for testing the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium-frequency power transmission system according to claim 1 is characterized in that: If the effectiveness of the over-current speed cut-off protection function of the bridge arm in the DC valve-controlled system to be tested is tested, the test platform is controlled to run according to the third test parameter, and the third operating data of the DC valve-controlled system to be tested is obtained, including: According to the power disconnection instruction of the first protection module of the standby main control panel and the disconnection instruction of the second protection module from the current measuring element of the DC converter valve in the third test parameter, the test platform is controlled to run in sequence to obtain the twelfth operation information of the standby main control panel; According to the twelfth operation information, it is determined that the DC valve control system to be tested executes a non-switching instruction, and then the test platform is controlled to run in sequence according to the disconnection instruction of 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 parameter, to obtain the thirteenth operation information of the main control panel; According to the thirteenth operation information, it is determined that the DC valve control system to be tested executes a non-switching instruction, and then the test platform is controlled to run according to the exit instruction and the switching instruction of the over-current speed cut-off protection function of the third protection module of the main control panel in the third test parameter, to obtain the fourteenth operation information; According to the fourteenth operation information, it is judged that the DC valve control system to be tested is operating normally, and the test platform is controlled to operate according to the third protection return constant and the third action constant of the third protection module of the main control panel after switching in the third test parameter, to obtain the fifteenth operation information of the main control panel after switching; If it is determined according to the fifteenth operation information that the DC valve control system to be tested is in locked operation, the protection return setting value and the action setting value of the third protection module in the main control panel after the switching are restored, and the DC valve control system to be tested is reset; or, If the effectiveness of the current rise rate protection function of the bridge arm of the DC valve-controlled system to be tested is tested, the third operating data of the DC valve-controlled system to be tested obtained by controlling the test platform to run according to the third test parameter includes: According to the disconnection instruction of the second protection module of the standby main control panel and the current measuring element of the DC converter valve and the exit instruction of the current rise rate protection function of the third protection module in the third test parameter, the test platform is controlled to run in sequence to obtain the sixteenth operation information of the standby main control panel; According to the sixteenth operation information, it is determined that the DC valve control system to be tested executes a non-switching instruction, then the test platform is controlled to operate in sequence according to the disconnection instruction of 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 parameter, to obtain the seventeenth operation information of the main control panel; According to the seventeenth operation information, it is determined that the DC valve control system to be tested executes a non-switching instruction, and then the test platform is controlled to run according to the exit instruction and the switching instruction of the current rise rate protection function of the second protection module of the main control panel in the third test parameter to obtain the eighteenth operation information; According to the eighteenth operation information, it is judged that the DC valve control system to be tested is operating normally, and the operation of the test platform is controlled according to the first protection return constant value and the first action constant value of the first protection module of the main control panel after switching in the third test parameter to obtain the nineteenth operation information of the main control panel after switching; If it is determined according to the nineteenth operation information that the DC valve control system to be tested is in locked operation, the protection return setting value and the action setting value of the first protection module in the main control panel after the switching are restored, and the DC valve control system to be tested is reset; Among them, the third operating data includes the twelfth operating information, the thirteenth operating information, the fourteenth operating information and the fifteenth operating information, or the third operating data includes the sixteenth operating information, the seventeenth operating information, the eighteenth operating information and the nineteenth operating information; the third protection return constant is less than the return threshold, and the third action constant is less than the rated current of the bridge arm of the rated parameter; the first protection return constant is less than the return threshold, and the first action constant is less than the rated current rise rate of the rated parameter; after switching, the main main control screen is the standby main control screen.

7. The method for testing the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium-frequency power transmission system according to claim 6 is characterized in that: The third judgment condition includes: if the twelfth operation information is that the standby main control panel outputs a minor fault message, the DC valve control system to be tested executes a no-switching instruction; if the thirteenth operation information is that the main main control panel outputs a minor fault message, the DC valve control system to be tested executes a no-switching instruction; if the fourteenth operation information is that the main main control panel and the standby main control panel are successfully switched and the DC valve control system to be tested is not disturbed, the DC valve control system to be tested operates normally; if the fifteenth operation information is that the output blocking trip signal of the main main control panel after switching, the DC valve control system to be tested is blocked and stopped; or, The third judgment condition includes: if the sixteenth operating information is that the backup main control panel outputs a minor fault message, the DC valve control system to be tested executes a no-switching instruction; if the seventeenth operating information is that the main main control panel outputs a minor fault message, the DC valve control system to be tested executes a no-switching instruction; if the eighteenth operating information is that the main main control panel and the backup main control panel are successfully switched and the DC valve control system to be tested is not disturbed, then the DC valve control system to be tested runs normally; if the nineteenth operating information is the output lockout tripping signal of the main main control panel after switching, then the DC valve control system to be tested is locked and stopped.

8. A test device for the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze 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 a test topology diagram of the connection between the DC converter valve and the DC valve control system to be tested and the rated power of the DC converter valve, build a test platform according to 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 to be tested includes a main control panel and a backup main control panel connected to the DC converter valve and redundant to each other, and the main control panel and the backup main control panel both include the same and mutually redundant first protection module, second protection module and third protection module; The first test module is used to obtain a first test parameter, control the operation of the test platform according to the first test parameter, and obtain first operation data of the DC valve control system to be tested; The second test module is used to obtain a second test parameter, control the operation of the test platform according to the second test parameter, and obtain second operation data of the DC valve control system to be tested; The third test module is used to obtain a third test parameter, control the operation of the test platform according to the third test parameter, and obtain third operation data of the DC valve-controlled system to be tested; The judgment module is used to judge whether the effectiveness of the DC valve-controlled bridge arm protection function of the tested sea breeze medium-frequency power transmission system has passed the test based on whether the first operating data, the second operating data and the third operating data all meet the corresponding first judgment condition, the second judgment condition and the third judgment condition.

9. The device for testing the effectiveness of the protection function of the DC valve-controlled bridge arm of the sea breeze medium-frequency power transmission system according to claim 8 is 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 constant value and the first action constant value of the first protection module of the standby main control panel in the first test parameter, and obtain the first operation information of the standby main control panel; The second test submodule is used to determine that the DC valve control system to be tested is operating normally according to the first operating information, and then control the operation of the test platform according to the second protection return constant value and the second action constant value of the second protection module of the standby main control panel in the first test parameter to obtain the second operating information of the standby main control panel; The third test submodule is used to determine that the DC valve control system to be tested is operating normally according to the second operating information, then restore the protection return constant value and the action constant value of the first protection module and the second protection module in the standby main control panel, and control the operation of the test platform according to the fourth protection return constant value and the fourth action constant value of the first protection module of the main main control panel in the first test parameter, so as to obtain the third operating information of the main main control panel; The fourth test submodule is used to determine that the DC valve control system to be tested is operating normally according to the third operating information, and then control the operation of the test platform according to the fifth protection return constant and the fifth action constant of the second protection module of the main control panel in the first test parameter to obtain the fourth operating information of the main control panel; The fifth test submodule is used to determine that the DC valve control system to be tested is locked and tripped according to the fourth operation information, then restore the protection return setting value and the action setting value of the first protection module and the second protection module in the main control panel, control the reset of the DC valve control system to be tested, and control the operation of the test platform according to the rated power to obtain the fifth operation information of the bridge arm in the DC converter valve; The first operation data includes the first operation information, the second operation information, the third operation information, the fourth operation information and the fifth operation information; the first protection return constant value is less than the return threshold, and the first action constant value is less than the rated parameter; the second protection return constant value is less than the return threshold, and the second action constant value is less than the rated parameter; the fourth protection return constant value is less than the return threshold, and the fourth action constant value is less than the rated parameter; The fifth protection return setting value is smaller than the return threshold value, and the fifth action setting value is smaller than the rated parameter.

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

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