Method and device for detecting fault power module processing function of flexible direct current valve control system

Abstract

The present invention discloses a detection method and device for the fault power module processing function of a flexible direct current valve control system. The method includes: selecting N1 power modules to close the bypass switch, selecting N2 power modules to cut off the uplink and downlink communication with the valve control system, and the background is latched as a black module state; selecting N3 power modules to cut off the uplink communication with the valve control system, and the background is latched as a bypass state; opening the bypass switch of N1 modules, closing the bypass switch of N2 modules, restoring the uplink communication between N3 modules and the valve control system and opening the bypass switch; the background performs state conversion and judgment on the modules in the black module state and the bypass state, and executes the next step if successful; otherwise, it is invalid; restoring the uplink and downlink communication between N2 modules and the valve control system and opening the bypass switch; judging whether the state of N2 power modules can be restored from the bypass state to the normal state, if it can be restored, it is valid, otherwise it is invalid. The present invention can timely and accurately detect the effectiveness of the fault power module processing function.

Description

Technical Field

[0001] The present invention relates to the technical field of valve control systems, and in particular to a method and a device for detecting a fault power module processing function of a flexible direct current valve control system. Background Art

[0002] Flexible DC transmission is a new type of power transmission method for power conversion and transmission. It has the advantages of flexible and convenient control, ideal operating characteristics, and good scalability. It is an important means to improve the capacity to accept renewable energy and enhance the stability and flexibility of the power grid. It has become the fastest-growing new generation of power transmission technology. The flexible DC converter valve is the core equipment of the flexible DC transmission system, which is equivalent to connecting a fully controllable intelligent "power valve" to the power system.

[0003] In a flexible DC transmission project, if some power modules of the flexible DC valve are bypassed or identified as black modules due to a fault during the last operation, the faulty power modules need to be processed before the next charging after the system is powered off and shut down, and the effectiveness of the faulty power module processing function of the flexible DC valve control system needs to be tested to avoid unstable operation of the flexible DC transmission system due to incorrect identification of the processed faulty power module status. Therefore, a method for testing the effectiveness of the faulty power module processing function of the flexible DC valve control system is urgently needed. Summary of the invention

[0004] The purpose of the present invention is to provide a method and device for detecting the fault power module processing function of a flexible direct current valve control system, so as to solve the technical problem in the prior art that the flexible direct current valve control system is difficult to detect the effectiveness of the fault power module processing function in a timely and accurate manner.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] The detection method of the fault power module processing function of the flexible direct current valve control system includes:

[0007] From all the normally operating power modules of the tested series valve section, a first number of power modules are selected to close the bypass switch, and a second number of power modules are selected to cut off the uplink and downlink communications with the flexible direct current valve control system, wherein the sum of the first number and the second number is less than the total number of power modules of the tested series valve section; the background of the flexible direct current valve control system latches the status of the first number of power modules and the second number of power modules as black module status;

[0008] The flexible direct current valve control system issues a controllable charging instruction to control the tested series valve section to enter a controllable charging stage, selects a third number of power modules from the remaining normally operating power modules, cuts off the uplink communication between the third number of power modules and the flexible direct current valve control system, and the flexible direct current valve control system background latches the state of the third number of power modules into a bypass state;

[0009] The flexible direct current valve control system issues a locking instruction to control the tested series valve section to enter a locking and shutdown phase, opens the bypass switch of the first number of power modules, closes the bypass switch of the second number of power modules, restores the uplink communication between the third number of power modules and the flexible direct current valve control system and opens the corresponding bypass switch;

[0010] The background of the flexible direct current valve control system performs state conversion on the power modules in the black module state and the bypass state according to the instruction, and judges whether the state conversion is successful according to the preset state conversion conditions when the tested series valve section is in the controllable charging waiting to be unlocked state. If the preset state conversion conditions are met, the state conversion is successful and the next step is executed; otherwise, the state conversion fails, and the fault power module processing function of the flexible direct current valve control system is invalid;

[0011] The flexible direct current valve control system issues a locking instruction to control the tested series valve section to enter a locking and shutdown phase, restores the uplink and downlink communications between the second number of power modules and the flexible direct current valve control system, and opens the corresponding bypass switch;

[0012] When the tested series valve section is in a controllable charging state to be unlocked, determine whether the background of the flexible direct current valve control system can restore the state of the second number of power modules from the bypass state to the normal state according to the first reset instruction. If so, the fault power module processing function of the flexible direct current valve control system is valid; if not, the fault power module processing function of the flexible direct current valve control system is invalid.

[0013] Optionally, the preset state transition condition is:

[0014] The background of the flexible direct current valve control system can restore the state of the first number of power modules from the black module state to the normal state according to the second reset instruction; and can convert the state of the second number of power modules from the black module state to the bypass state according to the bypass instruction; and can restore the state of the third number of power modules from the bypass state to the normal state according to the third reset instruction.

[0015] Optionally, the flexible direct current valve control system background latches the states of the first number of power modules and the second number of power modules as black module states, including:

[0016] Start the flexible direct current valve control system, start the test platform to charge the series valve section under test, control the operating current of the test platform to be within a first preset range, and the background of the flexible direct current valve control system latches the status of the first number of power modules and the second number of power modules as black module status and reports a message "black module appears".

[0017] Optionally, the first preset range is:

[0018] The flexible DC converter valve does not control the bridge arm current value within ±5% during the charging phase.

[0019] Optionally, the third quantity should satisfy the following conditions:

[0020] N3<N0-N1-N2, and N3<N trip ;

[0021] Wherein, N0 represents the total number of power modules of the tested series valve section, N1 represents the first number, N2 represents the second number, N3 represents the third number, and N trip Indicates the number of redundant modules in a single bridge arm.

[0022] Optionally, the flexible direct-current valve control system sends a controllable charging instruction to control the tested series valve section to enter a controllable charging stage, including:

[0023] The flexible direct-current valve control system issues a controllable charging instruction, and the tested series valve section enters a controllable charging stage, controlling the operating current of the test platform to be within a second preset range, and the normal operating power module voltage of the tested series valve section to be within a third preset range.

[0024] Optionally, the second preset range is:

[0025] The flexible DC converter valve can control the bridge arm current value during the charging phase within ±5%.

[0026] Optionally, the third preset range is:

[0027] Normal operating voltage of the power module is ±5%.

[0028] The present invention also provides a detection device for a fault power module processing function of a flexible direct current valve control system, comprising:

[0029] A black module setting module is used to select a first number of power modules from all normally operating power modules of the tested series valve section to close the bypass switch, and select a second number of power modules to cut off the uplink and downlink communications with the flexible direct current valve control system, wherein the sum of the first number and the second number is less than the total number of power modules of the tested series valve section; the background of the flexible direct current valve control system latches the status of the first number of power modules and the second number of power modules as black module status;

[0030] A bypass setting module, used for the flexible direct current valve control system to issue a controllable charging instruction to control the tested series valve section to enter a controllable charging stage, select a third number of power modules from the remaining normally operating power modules, cut off the uplink communication between the third number of power modules and the flexible direct current valve control system, and the flexible direct current valve control system background latches the state of the third number of power modules as a bypass state;

[0031] A first fault processing module, used for the flexible direct current valve control system to issue a locking instruction to control the tested series valve section to enter a locking and shutdown stage, to open the bypass switch of the first number of power modules, to close the bypass switch of the second number of power modules, to restore the uplink communication between the third number of power modules and the flexible direct current valve control system and to open the corresponding bypass switch;

[0032] The first state conversion module is used for the background of the flexible direct current valve control system to convert the state of the power module in the black module state and the bypass state according to the instruction. When the tested series valve section is in the controllable charging waiting to be unlocked state, it is judged whether the state conversion is successful according to the preset state conversion condition. If the preset state conversion condition is met, the state conversion is successful and the second fault processing module is executed; otherwise, the state conversion fails, and the fault power module processing function of the flexible direct current valve control system is invalid;

[0033] A second fault processing module is used for the flexible direct current valve control system to issue a locking instruction to control the tested series valve section to enter a locking and shutdown phase, restore the uplink and downlink communication between the second number of power modules and the flexible direct current valve control system and open the corresponding bypass switch;

[0034] The second state conversion module is used to determine whether the background of the flexible direct current valve control system can restore the state of the second number of power modules from the bypass state to the normal state according to the first reset instruction when the tested series valve section is in a controllable charging state to be unlocked. If so, the fault power module processing function of the flexible direct current valve control system is valid; if not, the fault power module processing function of the flexible direct current valve control system is invalid.

[0035] Optionally, the preset state transition condition is:

[0036] The background of the flexible direct current valve control system can restore the state of the first number of power modules from the black module state to the normal state according to the second reset instruction; and can convert the state of the second number of power modules from the black module state to the bypass state according to the bypass instruction; and can restore the state of the third number of power modules from the bypass state to the normal state according to the third reset instruction.

[0037] The present invention provides a detection method and device for a fault power module processing function of a flexible direct current valve control system, wherein the method comprises: selecting a first number of power modules from all normally operating power modules of a tested series valve section to close a bypass switch, and selecting a second number of power modules to cut off uplink and downlink communications with the flexible direct current valve control system, wherein the sum of the first number and the second number is less than the total number of power modules of the tested series valve section; the background of the flexible direct current valve control system latches the states of the first number of power modules and the second number of power modules as black module states; the flexible direct current valve control system issues a controllable charging instruction to control the tested series valve section to enter a controllable charging stage, selects a third number of power modules from the remaining normally operating power modules, cuts off the uplink communication between the third number of power modules and the flexible direct current valve control system, and the background of the flexible direct current valve control system latches the states of the third number of power modules as a bypass state; the flexible direct current valve control system issues a locking instruction to control the tested series valve section to enter a locking and shutdown stage, opens the bypass switch of the first number of power modules, closes the bypass switch of the second number of power modules, and restores Restore the uplink communication between the third number of power modules and the flexible direct current valve control system and open the corresponding bypass switch; the background of the flexible direct current valve control system performs state conversion on the power modules in the black module state and the bypass state according to the instruction, and when the tested series valve section is in the controllable charging state to be unlocked, judge whether the state conversion is successful according to the preset state conversion condition, if the preset state conversion condition is met, the state conversion is successful, and the next step is executed; otherwise, the state conversion fails, and the fault power module processing function of the flexible direct current valve control system is invalid; the flexible direct current valve control system issues a locking instruction to control the tested series valve section to enter the locking and shutdown stage, restore the uplink and downlink communication between the second number of power modules and the flexible direct current valve control system and open the corresponding bypass switch; when the tested series valve section is in the controllable charging state to be unlocked, judge whether the background of the flexible direct current valve control system can restore the state of the second number of power modules from the bypass state to the normal state according to the first reset instruction, if so, the fault power module processing function of the flexible direct current valve control system is valid; if not, the fault power module processing function of the flexible direct current valve control system is invalid.

[0038] In view of this, the beneficial effects brought by the present invention are:

[0039] The present invention sets a first number and a second number of power modules as black modules in two different ways, and latches the states of these power modules as black module states in the background of the valve control system; sets a third number of power modules as fault bypass modules, and latches them as bypass states in the background of the valve control system; after fault processing of the black modules and the bypass modules, the background of the flexible direct current valve control system performs state conversion on the power modules in the black module state and the bypass state according to instructions, and determines whether the state conversion is successful according to preset state conversion conditions. If successful, continue to determine whether the background of the flexible direct current valve control system can restore the state of the second number of power modules from the bypass state to the normal state, and further determine whether the fault power module processing function of the flexible direct current valve control system is effective; otherwise, it means that the fault power module processing function of the flexible direct current valve control system is invalid. The present invention sets a flexible direct current converter valve to start charging and unlocking operation, and after a faulty bypass module or a black module appears, when the flexible direct current valve is powered off and stopped, a disposal measure is determined according to the fault state of the faulty bypass module or the black module and the disposal is completed. The flexible direct current valve control system can timely modify its latched faulty power module state to the real module state after disposal, and can timely and accurately detect the effectiveness of the faulty power module processing function of the flexible direct current valve control system, thereby improving the stability and safety of the operation of the flexible direct current transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the process of the present invention;

[0041] Figure 2 It is a schematic diagram of the structure of the device of the present invention. DETAILED DESCRIPTION

[0042] The embodiment of the present invention provides a method and device for detecting the fault power module processing function of a flexible direct current valve control system, so as to solve the technical problem in the prior art that the flexible direct current valve control system is difficult to detect the effectiveness of the fault power module processing function in a timely and accurate manner.

[0043] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0045] In actual flexible direct current transmission projects, if some power modules of the flexible direct current converter valve (hereinafter referred to as flexible direct current valve) are bypassed or identified as black modules due to faults during the last operation, after the system is powered off and shut down, before the next charging is started, the faulty bypass module and the black module (module that has not established communication with the valve control after charging and whose status is unknown) need to be processed in accordance with the provisions of the maintenance regulations. When processing the faulty bypass module and the black module (module that has not established communication with the valve control after charging and whose status is unknown), specifically, the faulty bypass module is inspected and tested, and if the test is normal, the bypass switch is opened, and if the test is abnormal, a new module is replaced; the black module is inspected and tested, and if there is sufficient time, the fault can be cleared or replaced with a new module, and if there is not sufficient time, the bypass switch of the black module can be closed (the module will continue to participate in the system operation in the bypass state).

[0046] After completing the processing of the faulty power module, it is necessary to modify the fault status latched in the valve control system of the processed faulty module (including faulty bypass module and black module) through the faulty power module processing function of the flexible DC valve control system, so as to ensure that the next time the system starts charging and unlocks operation, the flexible DC valve control system can correctly issue the module control instructions according to the actual status information of the processed faulty module itself, avoiding the risk of the flexible DC valve control system issuing wrong instructions due to incorrect recognition of the status of the processed faulty power module.

[0047] The main contents of the fault power module processing function of the flexible direct current valve control system are as follows: Taking a single fault bypass module or black module as an example:

[0048] (1) If the module is to be used continuously after clearing the fault or replaced with a new module, it is necessary to enter the bridge arm name and module serial number of the module in the flexible direct current valve control system monitoring interface, and then click the "Reset" button. The module status latched in the valve control system background interface will be restored from the bypass state or black module state to the normal state;

[0049] (2) If it is a black module and its processing method is to close the bypass switch, you need to enter the bridge arm name and module serial number where the black module is located in the flexible direct current valve control system monitoring interface, and then click the "Bypass" button. The module status latched in the valve control system background interface will change from black module status to bypass status;

[0050] (3) In particular, if there are a large number of faulty bypass modules or black modules and the handling method is to clear the fault and continue to use or replace them with new modules, you can click the "Reset All Modules" button on the flexible direct current valve control system monitoring interface with one click, and the status of all faulty bypass modules or black modules latched in the background interface of the valve control system will be restored from the bypass state or black module state to the normal state.

[0051] See also Figure 1The following is an embodiment of a method for detecting a fault power module processing function of a flexible direct current valve control system provided by the present invention, comprising:

[0052] S100: From all the normally operating power modules of the tested series valve section, select a first number of power modules to close the bypass switch, and select a second number of power modules to cut off the uplink and downlink communications with the flexible direct current valve control system, wherein the sum of the first number and the second number is less than the total number of power modules of the tested series valve section; the flexible direct current valve control system background latches the states of the first number of power modules and the second number of power modules as black module states;

[0053] S200: the flexible direct current valve control system issues a controllable charging instruction to control the tested series valve section to enter a controllable charging stage, selects a third number of power modules from the remaining normally operating power modules, cuts off the uplink communication between the third number of power modules and the flexible direct current valve control system, and the flexible direct current valve control system background latches the state of the third number of power modules as a bypass state;

[0054] S300: the flexible direct current valve control system issues a locking instruction to control the tested series valve section to enter a locking and shutdown phase, opens the bypass switch of the first number of power modules, closes the bypass switch of the second number of power modules, restores the uplink communication between the third number of power modules and the flexible direct current valve control system, and opens the corresponding bypass switch;

[0055] S400: The background of the flexible direct current valve control system performs state conversion on the power modules in the black module state and the bypass state according to the instruction, and when the tested series valve section is in the controllable charging waiting to be unlocked state, it is judged whether the state conversion is successful according to the preset state conversion condition. If the preset state conversion condition is met, the state conversion is successful and the next step is executed; otherwise, the state conversion fails, and the fault power module processing function of the flexible direct current valve control system is invalid;

[0056] S500: the flexible direct current valve control system issues a locking instruction to control the tested series valve section to enter a locking and shutdown phase, restores the uplink and downlink communications between the second number of power modules and the flexible direct current valve control system, and opens the corresponding bypass switch;

[0057] S600: When the tested series valve section is in a controllable charging state to be unlocked, determine whether the background of the flexible direct current valve control system can restore the state of the second number of power modules from the bypass state to the normal state according to the first reset instruction. If so, the fault power module processing function of the flexible direct current valve control system is valid; if not, the fault power module processing function of the flexible direct current valve control system is invalid.

[0058] It should be noted that the flexible direct-current valve control system in this embodiment is a secondary device, which is used to control each power module unit in the series valve section under test in the test platform. In addition to the series valve section under test, the test platform also has a power supply system used to generate operating current to charge each power module in the series valve section under test.

[0059] In step S100, a first number of power modules are selected from all normally operating power modules of the tested series valve section to close the bypass switch, and a second number of power modules are selected to cut off the uplink and downlink communications with the flexible direct current valve control system. The sum of the first number and the second number is less than the total number of power modules of the tested series valve section. The background of the flexible direct current valve control system latches the status of the first number of power modules and the second number of power modules as black module status.

[0060] In step S100, the first number of power modules and the second number of power modules are respectively set as black modules in two different ways, and the states of these power modules are latched as black module states in the background of the flexible direct current valve control system. The black module in this embodiment refers to the power module in the tested series valve section that has not established communication with the flexible direct current valve control system after charging and whose state is unknown.

[0061] Specifically, the flexible direct current valve control system background latches the states of the first number of power modules and the second number of power modules as black module states, including:

[0062] Start the flexible direct current valve control system, and start the test platform to charge the series valve section under test, and control the operating current of the test platform to be within the first preset range. The flexible direct current valve control system background latches the status of the first number of power modules and the second number of power modules as black module status and reports "black module appears" in the message. In the preferred implementation, the first preset range is: ±5% of the bridge arm current value of the flexible direct current valve in the non-controlled charging stage, that is, the operating current I of the control test platform run The bridge arm current value I in the non-controlled charging stage of the flexible DC converter valve arm-charge1 within the range of ±5%.

[0063] In step S200, the flexible direct current valve control system sends a controllable charging instruction to control the tested series valve section to enter a controllable charging stage, including: the flexible direct current valve control system sends a controllable charging instruction, the tested series valve section enters a controllable charging stage, the operating current of the test platform is controlled to be within a second preset range, and the normal operating power module voltage of the tested series valve section is within a third preset range.

[0064] In a preferred embodiment, the second preset range is: ±5% of the bridge arm current value in the controllable charging stage of the flexible DC converter valve. The third preset range is: ±5% of the rated operating voltage of the normally operating power module.

[0065] That is, the operating current of the test platform is controlled within the range of ±5% of the bridge arm current value of the controllable charging stage of the flexible DC converter valve, and the normal operating power module voltage of the tested series valve section is stable at the rated operating voltage U N within the range of ±5%.

[0066] In a preferred embodiment, the third quantity should satisfy the following conditions:

[0067] N3<N0-N1-N2, and N3<N trip ;

[0068] Wherein, N0 represents the total number of power modules of the tested series valve section, N1 represents the first number, N2 represents the second number, N3 represents the third number, and N trip Indicates the number of redundant modules in a single bridge arm.

[0069] In step S300, the bypass switches of the first number of black modules are opened. This processing is to simulate one of the processing methods of the black modules, that is, replacing or repairing the black modules to become normal modules; the bypass switches of the second number of black modules are closed. This processing is to simulate another processing method of the black modules, that is, bypassing the black modules; the uplink communication between the third number of power modules and the flexible direct current valve control system is restored and the bypass switches corresponding to the modules are opened. This processing is to simulate the bypass module processing method, that is, replacing or repairing the bypass modules to become normal modules.

[0070] In step S400, the preset state transition condition is:

[0071] The background of the flexible direct current valve control system can restore the state of the first number of power modules from the black module state to the normal state according to the second reset instruction; and can convert the state of the second number of power modules from the black module state to the bypass state according to the bypass instruction; and can restore the state of the third number of power modules from the bypass state to the normal state according to the third reset instruction.

[0072] It should be noted that when the background of the flexible direct current valve control system performs state conversion for power modules in the black module state and the bypass state according to the instruction, the above three conditions need to be met at the same time. If one of them is not met, it means that the state conversion has failed, and the fault power module processing function of the flexible direct current valve control system cannot meet the actual demand, which means that the fault power module processing function of the flexible direct current valve control system is invalid. If the above three conditions can be met at the same time, it means that the state conversion is successful, and the second number of power modules in the bypass state will continue to be processed.

[0073] In step S500, the flexible direct current valve control system sends a locking instruction to control the tested series valve section to enter a locking and shutdown phase, restores the uplink and downlink communications between the second number of power modules and the flexible direct current valve control system, and opens the corresponding bypass switches.

[0074] After the previous processing, the state of the first number of power modules has been converted from the black module state to the normal state, and the state of the third number of power modules has been converted from the bypass state to the normal state, that is, the states of the first number of power modules and the third number of power modules are both normal states, and step S500 is to perform fault recovery processing on the remaining second number of power modules (which are in the bypass state at this time).

[0075] In step S600, when the tested series valve section is in a controllable charging state to be unlocked, it is determined whether the background of the flexible direct current valve control system can restore the state of the second number of power modules from the bypass state to the normal state according to the first reset instruction. If so, the fault power module processing function of the flexible direct current valve control system is valid; if not, the fault power module processing function of the flexible direct current valve control system is invalid.

[0076] A preferred implementation method is to click the "Reset All Modules" button in the background of the valve control system to determine whether the status of the second number of power modules latched in the background of the flexible direct current valve control system has all been restored from the bypass state to the normal state. If so, it means that the fault power module processing function of the flexible direct current valve control system is valid; if not, the fault power module processing function of the flexible direct current valve control system is invalid.

[0077] The detection method of the faulty power module processing function of the flexible direct current valve control system provided in the present embodiment sets the first and second quantities of power modules as black modules in two different ways, and latches the states of these power modules as black module states in the background of the valve control system, sets the third quantity of power modules as faulty bypass modules, and latches them as bypass states in the background of the valve control system. After the black modules and bypass modules are fault processed, the background of the flexible direct current valve control system performs state conversion on the power modules in the black module state and the bypass state according to the instructions, and determines whether the state conversion is successful according to the preset state conversion conditions. If successful, continue to determine whether the background of the flexible direct current valve control system can restore the state of the second quantity of power modules from the bypass state to the normal state; otherwise, the faulty power module processing function of the flexible direct current valve control system is invalid. The present invention sets a flexible direct current converter valve to start charging and unlocking operation, and after a faulty bypass module or a black module appears, a disposal measure is determined according to the faulty bypass module or the black module fault state when the flexible direct current valve is powered off and stopped, and after the disposal is completed, the valve control system can timely modify its latched faulty power module state to the real module state after disposal, and can timely and accurately detect the effectiveness of the faulty power module processing function of the flexible direct current valve control system.

[0078] The following is another embodiment of the method for detecting the fault power module processing function of the flexible direct current valve control system provided by the present invention, comprising:

[0079] Step 1: Before the test begins, first confirm that all power modules in the tested series valve section (the total number of power modules is N0) are in normal condition, then select N1 power modules to close their bypass switches, and select N2 power modules to cut off all upstream and downstream communications with the flexible direct current valve control system to ensure that N1+N2<N0.

[0080] It should be noted that step 1 is to set the N1+N2 power modules as black modules to facilitate subsequent testing of these black modules.

[0081] Step 2: Then start the flexible direct-flow valve control system and start the test platform to charge the tested series valve section (the total number of modules is N0) and control the operating current I of the test platform run The bridge arm current value I in the non-controlled charging stage of the flexible DC converter valve arm-charge1 Nearby, the background interface of the flexible direct current valve control system latches the status of N1+N2 power modules as black module status, and the message (SER) reports "black module appears".

[0082] In a preferred embodiment, the test platform operating current I run The bridge arm current value I in the non-controlled charging stage of the flexible DC converter valve arm-charge1 Nearby, nearby generally refers to I arm-charge1 within the range of ±5%.

[0083] The second step is to allow the background interface of the flexible direct current valve control system to latch the status of the N1+N2 power modules as black module status.

[0084] Step 3: Control the flexible direct current valve control system to issue a controllable charging command but never issue an unlocking command. The tested series valve section (the total number of power modules is N0) enters the controllable charging stage and controls the operating current I of the test platform. run The bridge arm current value I in the controllable charging stage of the flexible DC converter valve arm-charge2 Nearby, the module voltage is stable at the rated operating voltage U N Nearby, then select N3 (N3<N0-N1-N2, and N3<number of redundant modules of a single bridge arm N) in the normal operating power module (non-black module) trip ) power modules, cutting off the uplink communication between these power modules and the flexible DC valve control system. The background interface of the flexible DC valve control system latches the status of these N3 power modules as bypass status and reports the message SER "power module bypass occurs".

[0085] It should be noted that the charging stage of the power module is divided into two states: uncontrolled charging and controlled charging. It first enters the uncontrolled stage and then the controlled stage. Only when the power module enters the controlled charging can it identify the uplink communication failure and then bypass the module, thereby manufacturing a bypass module.

[0086] It should be noted that step three is to set the N3 power modules as bypass modules, and at the same time let the background interface of the flexible direct current valve control system latch the status of the N3 power modules as bypass status.

[0087] Step 4: The control valve control system issues a lockout and shutdown command to control the operating current I of the test platform run The size of is 0, and the tested series valve section (the total number of power modules is N0) enters the locked shutdown stage. After the module is discharged and confirmed to be safe, the bypass switches of the N1 black modules bypassed before charging are opened, and the bypass switches of the N2 black modules whose uplink and downlink communications are interrupted before charging are closed. The uplink communication between the N3 power modules bypassed in the controllable charging stage and the flexible direct current valve control system is restored and the bypass switches corresponding to the modules are opened.

[0088] It should be noted that the bypass switches of the N1 black modules are opened. This treatment is to simulate one of the treatment methods of the black modules, that is, replacing or repairing the black modules to become normal modules; the bypass switches of the N2 black modules are closed. This treatment is to simulate another treatment method of the black modules, that is, bypassing the black modules; the uplink communication between the N3 power modules and the flexible direct current valve control system is restored and the bypass switches corresponding to the modules are opened. This treatment is to simulate the bypass module treatment method, that is, replacing or repairing the bypass modules to become normal modules.

[0089] It should be noted that step 4 is to perform fault recovery processing on the previously set black module and bypass module.

[0090] Step 5: In the background interface of the flexible direct current valve control system, enter the bridge arm name and module serial number of the N1 black modules bypassed before charging and click the "Reset" button. The background interface of the flexible direct current valve control system will restore the latched status of the N1 power modules from the black module state to the normal state; in the background interface of the valve control system, enter the bridge arm name and module serial number of the N2 black modules whose upstream and downstream communications were interrupted before charging and click the "Bypass" button. The background interface of the valve control system will convert the latched status of the N2 power modules from the black module state to the bypass state; in the background interface of the valve control system, enter the bridge arm name and module serial number of the N3 power modules bypassed in the controllable charging stage and click the "Reset" button. The background interface of the valve control system will restore the latched status of the N3 bypass modules from the bypass state to the normal state.

[0091] It should be noted that step five is based on the different processing methods for the faulty modules (including black modules and bypass modules) in step four. The faulty power module processing function is used in the background interface of the flexible direct current valve control system to process the latched module status, and at the same time verify the effectiveness of the valve control faulty power module processing function.

[0092] Step 6: Start the test platform to charge the tested series valve section (the total number of power modules is N0), control the valve control system to operate the tested series valve section (the total number of power modules is N0) to a controllable charging waiting unlocking state, and control the test platform operating current I run The bridge arm current value I in the controllable charging stage of the flexible DC converter valve arm-charge2 The background interface of the flexible direct current valve control system will show that the status of the above N1+N3 power modules is normal and the module voltage is stable at the rated operating voltage U N The nearby N2 power modules are in bypass state and the SER message does not report "black module appears".

[0093] It should be noted that restarting the test platform in step six is ​​to further confirm whether the flexible direct current valve control system can correctly identify the actual state of the power module after the fault is handled.

[0094] Step 7: Control the flexible direct current valve control system to issue a lockout and shutdown command to control the operating current I of the test platform run The size of is 0, and the tested series valve section (the total number of power modules is N0) enters the locked shutdown stage. After the module is discharged and confirmed to be safe, the upstream and downstream communications between the N2 power modules in the bypass and the valve control system are restored and the bypass switches corresponding to the modules are opened.

[0095] It should be noted that, after the previous processing, the states of N1 power modules and N3 power modules are already normal, and step seven is to perform fault recovery processing on the remaining N2 power modules (which are in bypass state at this time).

[0096] Step 8: Click the "Reset All Modules" button on the background interface of the flexible DC valve control system. The background interface of the flexible DC valve control system will restore the status of the N2 power modules of the above reset bypass from the bypass state to the normal state.

[0097] It should be noted that step eight is a different processing method for the module based on step seven. The fault power module processing function is used to process the latched module status in the background interface of the flexible direct current valve control system, and the effectiveness of the valve control fault power module processing function is verified at the same time.

[0098] Step 9: Start the test platform to charge the tested series valve section (the total number of power modules is N0), control the valve control system to operate the tested series valve section (the total number of power modules is N0) to a controllable charging waiting unlocking state, and control the test platform operating current I run The bridge arm current value I in the controllable charging stage of the flexible DC converter valve arm-charge2 Nearby, the background interface of the flexible direct current valve control system sets the status of the above N2 power modules to normal and the module voltage is stable at the rated operating voltage U N nearby.

[0099] It should be noted that in step nine, the purpose of restarting the test platform is to further confirm whether the flexible direct current valve control system can correctly identify the real status of the module after the faulty power module processing function.

[0100] Step 10: The control valve control system issues a lockout and shutdown command to control the operating current I of the test platform run The size of is 0, and the tested series valve section (the total number of power modules is N0) enters the locked shutdown stage. At this point, the test is considered to have passed.

[0101] The test result of the fault power module handling function test of the flexible direct current valve control system must be a passed test.

[0102] It should be noted that if the results of each step are different from those derived theoretically, it means that the fault power module processing function of the flexible direct current valve control system does not meet the design requirements, and the manufacturer needs to find out the reasons and make corrections.

[0103] The present invention carries out a verification test on the fault power module processing function of the valve control system of the flexible DC converter valve. The purpose of the test is to verify that after a faulty bypass module or a black module appears during the startup charging and unlocking operation of the flexible DC converter valve, when the flexible DC valve is powered off and stopped, the handling measures (maintenance or replacement, manual bypass) are determined according to the fault status of the faulty bypass module or the black module and after the handling is completed, the effectiveness of the fault power module processing function of the valve control system is detected. The valve control system should be able to promptly modify its latched fault power module status to the actual module status after handling.

[0104] See also Figure 2 The following is an embodiment of a detection device for a fault power module processing function of a flexible direct current valve control system of the present invention, comprising:

[0105] A black module setting module is used to select a first number of power modules from all normally operating power modules of the tested series valve section to close the bypass switch, and select a second number of power modules to cut off the uplink and downlink communications with the flexible direct current valve control system, wherein the sum of the first number and the second number is less than the total number of power modules of the tested series valve section; the background of the flexible direct current valve control system latches the status of the first number of power modules and the second number of power modules as black module status;

[0106] A bypass setting module, used for the flexible direct current valve control system to issue a controllable charging instruction to control the tested series valve section to enter a controllable charging stage, select a third number of power modules from the remaining normally operating power modules, cut off the uplink communication between the third number of power modules and the flexible direct current valve control system, and the flexible direct current valve control system background latches the state of the third number of power modules as a bypass state;

[0107] A first fault processing module, used for the flexible direct current valve control system to issue a locking instruction to control the tested series valve section to enter a locking and shutdown stage, to open the bypass switch of the first number of power modules, to close the bypass switch of the second number of power modules, to restore the uplink communication between the third number of power modules and the flexible direct current valve control system and to open the corresponding bypass switch;

[0108] The first state conversion module is used for the background of the flexible direct current valve control system to convert the state of the power module in the black module state and the bypass state according to the instruction. When the tested series valve section is in the controllable charging waiting to be unlocked state, it is judged whether the state conversion is successful according to the preset state conversion condition. If the preset state conversion condition is met, the state conversion is successful and the second fault processing module is executed; otherwise, the state conversion fails, and the fault power module processing function of the flexible direct current valve control system is invalid;

[0109] A second fault processing module is used for the flexible direct current valve control system to issue a locking instruction to control the tested series valve section to enter a locking and shutdown phase, restore the uplink and downlink communication between the second number of power modules and the flexible direct current valve control system and open the corresponding bypass switch;

[0110] The second state conversion module is used to determine whether the background of the flexible direct current valve control system can restore the state of the second number of power modules from the bypass state to the normal state according to the first reset instruction when the tested series valve section is in a controllable charging state to be unlocked. If so, the fault power module processing function of the flexible direct current valve control system is valid; if not, the fault power module processing function of the flexible direct current valve control system is invalid.

[0111] Specifically, the preset state transition condition is:

[0112] The background of the flexible direct current valve control system can restore the state of the first number of power modules from the black module state to the normal state according to the second reset instruction; and can convert the state of the second number of power modules from the black module state to the bypass state according to the bypass instruction; and can restore the state of the third number of power modules from the bypass state to the normal state according to the third reset instruction.

[0113] 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.

[0114] In the 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.

[0115] 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.

[0116] In addition, each functional unit in each embodiment of the present invention 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.

[0117] 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 invention 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, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0118] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. 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 invention.

Claims

1. A method for detecting the fault power module processing function of a flexible direct current valve control system, characterized in that: include: From all the normally operating power modules of the tested series valve section, a first number of power modules are selected to close the bypass switch, and a second number of power modules are selected to cut off the uplink and downlink communications with the flexible direct current valve control system, wherein the sum of the first number and the second number is less than the total number of power modules of the tested series valve section; the background of the flexible direct current valve control system latches the status of the first number of power modules and the second number of power modules as black module status; The flexible direct current valve control system issues a controllable charging instruction to control the tested series valve section to enter a controllable charging stage, selects a third number of power modules from the remaining normally operating power modules, cuts off the uplink communication between the third number of power modules and the flexible direct current valve control system, and the flexible direct current valve control system background latches the state of the third number of power modules into a bypass state; The flexible direct current valve control system issues a locking instruction to control the tested series valve section to enter a locking and shutdown phase, opens the bypass switch of the first number of power modules, closes the bypass switch of the second number of power modules, restores the uplink communication between the third number of power modules and the flexible direct current valve control system and opens the corresponding bypass switch; The backend of the flexible direct current valve control system performs state conversion on the power modules in the black module state and the bypass state according to the instruction, and when the tested series valve section is in the controllable charging waiting to be unlocked state, it is judged whether the state conversion is successful according to the preset state conversion condition. If the preset state conversion condition is met, the state conversion is successful, and the next step is executed; Otherwise, the state conversion fails, and the fault power module processing function of the flexible direct current valve control system is invalid; The flexible direct current valve control system issues a locking instruction to control the tested series valve section to enter a locking and shutdown phase, restores the uplink and downlink communications between the second number of power modules and the flexible direct current valve control system, and opens the corresponding bypass switch; When the tested series valve section is in a controllable charging waiting to be unlocked state, determine whether the background of the flexible direct current valve control system can restore the state of the second number of power modules from the bypass state to the normal state according to the first reset instruction. If so, the fault power module processing function of the flexible direct current valve control system is valid; if not, the fault power module processing function of the flexible direct current valve control system is invalid; The preset state transition condition is: The background of the flexible direct current valve control system can restore the state of the first number of power modules from the black module state to the normal state according to the second reset instruction; and can convert the state of the second number of power modules from the black module state to the bypass state according to the bypass instruction; and can restore the state of the third number of power modules from the bypass state to the normal state according to the third reset instruction.

2. The method for detecting the fault power module processing function of the flexible direct current valve control system according to claim 1 is characterized in that: The flexible direct current valve control system backend latches the states of the first number of power modules and the second number of power modules as black module states, including: Start the flexible direct current valve control system, start the test platform to charge the tested series valve section, control the operating current of the test platform to be within a first preset range, and the background of the flexible direct current valve control system latches the status of the first number of power modules and the second number of power modules as black module status and reports a message "black module appears".

3. The method for detecting the fault power module processing function of the flexible direct current valve control system according to claim 2 is characterized in that: The first preset range is: The flexible DC converter valve does not control the bridge arm current value during the charging phase within ±5%.

4. The method for detecting the fault power module processing function of the flexible direct current valve control system according to claim 1 is characterized in that: The third quantity shall satisfy the following conditions: ,and ; in, Indicates the total number of power modules in the tested series valve section, represents the first quantity, represents the second quantity, represents the third quantity, Indicates the number of redundant modules in a single bridge arm.

5. The method for detecting the fault power module processing function of the flexible direct current valve control system according to claim 1 is characterized in that: The flexible direct-current valve control system sends a controllable charging instruction to control the tested series valve section to enter a controllable charging stage, including: The flexible direct-current valve control system issues a controllable charging instruction, and the tested series valve section enters a controllable charging stage, controlling the operating current of the test platform to be within a second preset range, and the normal operating power module voltage of the tested series valve section to be within a third preset range.

6. The method for detecting the fault power module processing function of the flexible direct current valve control system according to claim 5 is characterized in that: The second preset range is: ±5% of the bridge arm current value during the controllable charging phase of the flexible DC converter valve.

7. The method for detecting the fault power module processing function of the flexible direct current valve control system according to claim 5 is characterized in that: The third preset range is: ±5% of the rated operating voltage of the power module in normal operation.

8. A detection device for the fault power module processing function of a flexible direct current valve control system, characterized in that: include: A black module setting module is used to select a first number of power modules from all normally operating power modules of the tested series valve section to close the bypass switch, and select a second number of power modules to cut off the uplink and downlink communications with the flexible direct current valve control system, wherein the sum of the first number and the second number is less than the total number of power modules of the tested series valve section; the background of the flexible direct current valve control system latches the status of the first number of power modules and the second number of power modules as black module status; A bypass setting module, used for the flexible direct current valve control system to issue a controllable charging instruction to control the tested series valve section to enter a controllable charging stage, select a third number of power modules from the remaining normally operating power modules, cut off the uplink communication between the third number of power modules and the flexible direct current valve control system, and the flexible direct current valve control system background latches the state of the third number of power modules as a bypass state; A first fault processing module, used for the flexible direct current valve control system to issue a locking instruction to control the tested series valve section to enter a locking and shutdown stage, to open the bypass switch of the first number of power modules, to close the bypass switch of the second number of power modules, to restore the uplink communication between the third number of power modules and the flexible direct current valve control system and to open the corresponding bypass switch; A first state conversion module is used for the background of the flexible direct current valve control system to convert the state of the power module in the black module state and the bypass state according to the instruction, and when the tested series valve section is in the controllable charging waiting to be unlocked state, it is judged whether the state conversion is successful according to the preset state conversion condition. If the preset state conversion condition is met, the state conversion is successful, and the second fault processing module is executed; Otherwise, the state conversion fails, and the fault power module processing function of the flexible direct current valve control system is invalid; A second fault processing module is used for the flexible direct current valve control system to issue a locking instruction to control the tested series valve section to enter a locking and shutdown phase, restore the uplink and downlink communication between the second number of power modules and the flexible direct current valve control system and open the corresponding bypass switch; A second state conversion module is used to determine whether the background of the flexible direct current valve control system can restore the state of the second number of power modules from the bypass state to the normal state according to the first reset instruction when the tested series valve section is in a controllable charging state to be unlocked. If so, the fault power module processing function of the flexible direct current valve control system is valid; if not, the fault power module processing function of the flexible direct current valve control system is invalid; The preset state transition condition is: The background of the flexible direct current valve control system can restore the state of the first number of power modules from the black module state to the normal state according to the second reset instruction; and can convert the state of the second number of power modules from the black module state to the bypass state according to the bypass instruction; and can restore the state of the third number of power modules from the bypass state to the normal state according to the third reset instruction.

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