Detection method of inlet valve temperature protection function of flexible direct valve valve cooling control protection system

Abstract

The present invention discloses a method for detecting the inlet valve temperature protection function of a flexible direct valve valve cooling control protection system, comprising: using an inlet valve temperature modification device to sequentially modify the first and second cooling water inlet valve temperatures sent by the valve cooling system to a temperature value greater than an over-temperature alarm preset value and less than an over-temperature lockout trip preset value, sequentially judging whether the valve cooling control protection system performs a first over-temperature protection action to detect whether the cooling water inlet valve temperature over-temperature alarm function is effective; when the inlet valve temperature over-temperature alarm function is effective, resetting the valve cooling control protection system and the valve cooling system, using an inlet valve temperature modification device to sequentially modify the first and second cooling water inlet valve temperatures to a temperature value greater than an over-temperature lockout trip preset value, sequentially judging whether the valve cooling control protection system performs a second over-temperature protection action to detect whether the valve cooling water inlet valve temperature over-temperature lockout trip function is effective. The present invention can detect the effectiveness of the cooling water inlet valve temperature protection function in real time and comprehensively.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible direct current (DC) converter valves, and in particular to a method for detecting a valve inlet temperature protection function of a valve cooling control protection system of a flexible DC converter valve. Background Art

[0002] Flexible DC transmission technology is a new type of DC transmission technology based on voltage source converter VSC composed of insulated bipolar transistors IGBT, controllable shutdown devices and pulse width modulation PWM technology. It has broad application prospects in island power supply, renewable energy grid connection, urban power grid power supply, etc.

[0003] The flexible DC converter valve (abbreviated as flexible DC valve) uses IGBT components. Since IGBT components generate a lot of heat during operation, in order to ensure the stable operation of the converter valve, the flexible DC converter valve valve cooling system is required to cool it. In order to ensure that the IGBT and other components of the flexible DC converter valve work within the normal temperature range, it is necessary to detect the effectiveness of the cooling water inlet valve temperature protection function in the valve cooling control protection system of the flexible DC valve in real time and comprehensively. Summary of the invention

[0004] The purpose of the present invention is to provide a detection method for the inlet valve temperature protection function of a flexible direct valve cooling control protection system, so as to solve the technical problem in the prior art that it is impossible to detect the effectiveness of the cooling water inlet valve temperature protection function in a flexible direct valve cooling control protection system in real time and comprehensively.

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

[0006] The detection method of the inlet valve temperature protection function of the flexible direct valve valve cold control protection system includes:

[0007] The valve cooling control and protection system and the valve cooling system of the flexible direct current converter valve are controlled to be in a stable operating state, and the inlet valve temperature modification device is used to modify the inlet valve temperature of the first cooling water sent by the valve cooling system from the measured temperature value to the first temperature value, and then the inlet valve temperatures of the three cooling waters are continuously sent to the valve cooling control and protection system;

[0008] Determine whether the valve cooling control protection system has executed the first over-temperature protection action, and if so, the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid;

[0009] If not, the inlet valve temperature modification device is used to modify the inlet valve temperature of the second cooling water sent by the valve cooling system from the measured temperature value to the second temperature value, and then the inlet valve temperatures of the three cooling waters are continued to be sent to the valve cooling control protection system to determine whether the valve cooling control protection system has executed the first over-temperature protection action. If so, the valve cooling control protection system and the valve cooling system are reset to execute the next step; if not, the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid;

[0010] The inlet valve temperature modification device is used to modify the inlet valve temperature of the first cooling water sent by the valve cooling system from the measured temperature value to the third temperature value, and then the inlet valve temperatures of the three cooling waters are continuously sent to the valve cooling control and protection system;

[0011] Determine whether the valve cooling control protection system has executed the second over-temperature protection action, and if so, the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid;

[0012] If not, the inlet valve temperature modification device is used to modify the inlet valve temperature of the second cooling water sent by the valve cooling system from the measured temperature value to the fourth temperature value, and then the inlet valve temperatures of the three cooling waters are continued to be sent to the valve cooling control protection system to determine whether the valve cooling control protection system has executed the second over-temperature protection action. If so, the cooling water inlet valve temperature protection function of the valve cooling control protection system is valid; if not, the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid;

[0013] Among them, the first temperature value and the second temperature value are both greater than the over-temperature alarm preset value and less than the over-temperature lockout trip preset value, and the third temperature value and the fourth temperature value are both greater than the over-temperature lockout trip preset value.

[0014] Optionally, executing the first over-temperature protection action includes:

[0015] A cooling water inlet valve overtemperature alarm is issued.

[0016] Optionally, executing the second over-temperature protection action includes:

[0017] An over-temperature lockout trip signal is issued and the cooling water inlet valve temperature over-temperature lockout trip is performed.

[0018] Optionally, before determining whether the valve cooling control protection system executes the first over-temperature protection action, the method further includes:

[0019] The valve cooling control protection system detects whether the temperatures of at least two of the three cooling water inlet valves sent up are greater than the over-temperature alarm preset value and the duration exceeds the first preset time threshold. If so, the valve cooling control protection system performs the first over-temperature protection action;

[0020] If not, the valve cooling control protection system does not perform the first over-temperature protection action.

[0021] Optionally, before determining whether the valve cooling control protection system has executed the second over-temperature protection action, the method further includes:

[0022] The valve cooling control protection system detects whether the temperatures of at least two of the three cooling water inlet valves sent up are greater than the over-temperature lockout tripping preset value and the duration exceeds the second preset time threshold. If so, the valve cooling control protection system performs the second over-temperature protection action;

[0023] If not, the valve cooling control protection system does not perform the second over-temperature protection action.

[0024] Optionally, controlling the valve cooling control protection system of the flexible direct current converter valve and the valve cooling system to be in a stable operating state includes:

[0025] The valve cooling control protection system and valve cooling system of the flexible direct current converter valve are started and operated to a stable operating state, and the heater in the valve cooling system is controlled to keep the inlet valve temperature of the three-way cooling water within a preset temperature range.

[0026] Optionally, the temperature within the preset temperature range is lower than the over-temperature alarm preset value.

[0027] Optionally, resetting the valve cooling control protection system and the valve cooling system comprises:

[0028] The inlet valve temperature modification device is used to restore the inlet valve temperatures of the first cooling water and the second cooling water to the actually measured temperature values, and the valve cooling control protection system is reset.

[0029] Optionally, the first temperature value is the same as or different from the second temperature value.

[0030] Optionally, the third temperature value is the same as or different from the fourth temperature value.

[0031] The present invention provides a detection method for the inlet valve temperature protection function of a valve cooling control and protection system of a flexible direct-current valve, comprising: controlling the valve cooling control and protection system of the flexible direct-current valve and the valve cooling system to be in a stable operating state, using an inlet valve temperature modification device to modify the inlet valve temperature of the first cooling water sent by the valve cooling system from an actual temperature value to a first temperature value, and then continuing to send the inlet valve temperatures of three cooling waters to the valve cooling control and protection system; judging whether the valve cooling control and protection system has executed a first over-temperature protection action, and if so, the cooling water inlet valve temperature protection function of the valve cooling control and protection system is invalid; if not, using the inlet valve temperature modification device to modify the inlet valve temperature of the second cooling water sent by the valve cooling system from an actual temperature value to a second temperature value, and then continuing to send the inlet valve temperatures of three cooling waters to the valve cooling control and protection system, judging whether the valve cooling control and protection system has executed the first over-temperature protection action, and if so, resetting the valve cooling control and protection system and the valve cooling system, and executing the next step; if not, the cooling water inlet valve temperature protection function of the valve cooling control and protection system is invalid; using the The inlet valve temperature modification device modifies the inlet valve temperature of the first cooling water sent by the valve cooling system from the measured temperature value to the third temperature value, and then continues to send the inlet valve temperatures of the three cooling waters to the valve cooling control and protection system; judges whether the valve cooling control and protection system has executed the second over-temperature protection action, and if so, the cooling water inlet valve temperature protection function of the valve cooling control and protection system is invalid; if not, the inlet valve temperature modification device is used to modify the inlet valve temperature of the second cooling water sent by the valve cooling system from the measured temperature value to the fourth temperature value, and then continues to send the inlet valve temperatures of the three cooling waters to the valve cooling control and protection system, and judges whether the valve cooling control and protection system has executed the second over-temperature protection action, and if so, the cooling water inlet valve temperature protection function of the valve cooling control and protection system is valid; if not, the cooling water inlet valve temperature protection function of the valve cooling control and protection system is invalid; wherein, the first temperature value and the second temperature value are both greater than the over-temperature alarm preset value and less than the over-temperature lockout trip preset value, and the third temperature value and the fourth temperature value are both greater than the over-temperature lockout trip preset value.

[0032] In view of this, the beneficial effects brought by the present invention are:

[0033] The present invention utilizes an inlet valve temperature modification device to sequentially modify the first and second cooling water inlet valve temperatures delivered by the valve cooling system to temperature values ​​greater than an over-temperature alarm preset value and less than an over-temperature lockout trip preset value, and sequentially determines whether the valve cooling control and protection system performs a first over-temperature protection action to detect whether the cooling water inlet valve temperature over-temperature alarm function in the valve cooling control and protection system is effective; when the cooling water inlet valve temperature over-temperature alarm function is effective, the valve cooling control and protection system and the valve cooling system are reset, and the inlet valve temperature modification device is utilized to sequentially modify the first and second cooling water inlet valve temperatures to temperature values ​​greater than an over-temperature lockout trip preset value, and sequentially determines whether the valve cooling control and protection system performs a second over-temperature protection action to detect whether the cooling water inlet valve temperature over-temperature lockout trip function in the valve cooling control and protection system is effective. The present invention successively determines whether the over-temperature alarm function and the over-temperature lockout tripping function in the cooling water inlet valve temperature protection function of the flexible DC valve valve cooling control protection system are effective, and can detect the effectiveness of the valve inlet temperature protection function of the valve cooling control protection system in real time, comprehensively and accurately, and promptly discover the abnormal situation of the cooling water inlet valve temperature and execute protection actions, which can ensure the safe and stable operation of the flexible DC converter valve and improve the operating reliability and safety of the flexible DC power transmission system.

[0034] At the same time, in the process of detecting the cooling water inlet valve temperature protection function of the flexible direct current valve cooling control protection system, the present invention adopts the real valve cooling control protection system in the actual flexible direct current power transmission project. Compared with the simulation test method, the present invention has better effectiveness, authenticity and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0036] An embodiment of the present invention provides a method for detecting the inlet valve temperature protection function of a flexible direct valve cooling control protection system to solve the technical problem in the prior art that the effectiveness of the cooling water inlet valve temperature protection function in the flexible direct valve cooling control protection system cannot be detected in real time and comprehensively.

[0037] 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.

[0038] 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.

[0039] See also Figure 1 The following is an embodiment of a method for detecting the inlet valve temperature protection function of the flexible direct valve valve cooling control protection system provided by the present invention, including:

[0040] S100: Control the valve cooling control and protection system of the flexible DC converter valve and the valve cooling system to be in a stable operating state, modify the inlet valve temperature of the first cooling water sent by the valve cooling system from the measured temperature value to the first temperature value by using the inlet valve temperature modification device, and then continue to send the inlet valve temperatures of the three cooling waters to the valve cooling control and protection system;

[0041] S200: determining whether the valve cooling control protection system has executed a first over-temperature protection action, and if so, the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid;

[0042] S300: If not, modify the inlet valve temperature of the second cooling water sent by the valve cooling system from the measured temperature value to the second temperature value by using the inlet valve temperature modification device, and then continue to send the inlet valve temperatures of the three cooling waters to the valve cooling control protection system to determine whether the valve cooling control protection system has executed the first over-temperature protection action. If so, reset the valve cooling control protection system and the valve cooling system and execute the next step; if not, the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid;

[0043] S400: using the inlet valve temperature modification device to modify the inlet valve temperature of the first cooling water sent by the valve cooling system from the measured temperature value to the third temperature value, and then continue to send the inlet valve temperatures of the three cooling waters to the valve cooling control protection system;

[0044] S500: determining whether the valve cooling control protection system has executed the second over-temperature protection action, and if so, the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid;

[0045] S600: If not, the inlet valve temperature modification device is used to modify the inlet valve temperature of the second cooling water sent by the valve cooling system from the measured temperature value to the fourth temperature value, and then the inlet valve temperatures of the three cooling waters are continued to be sent to the valve cooling control protection system to determine whether the valve cooling control protection system has executed the second over-temperature protection action. If so, the cooling water inlet valve temperature protection function of the valve cooling control protection system is valid; if not, the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid;

[0046] Among them, the first temperature value and the second temperature value are both greater than the over-temperature alarm preset value and less than the over-temperature lockout trip preset value, and the third temperature value and the fourth temperature value are both greater than the over-temperature lockout trip preset value.

[0047] In one embodiment, the valve cooling system of the flexible DC converter valve, the inlet valve temperature modification device and the valve cooling control and protection system are connected in sequence. The valve cooling system of the flexible DC converter valve measures the actual temperature values ​​of the three cooling waters through the temperature sensor. In the process of sending the actual temperature values ​​of the three cooling waters of the valve cooling system to the valve cooling control and protection system, the inlet valve temperature modification device can be used to modify the temperature value of one or more of the three cooling waters. Then, the three cooling water inlet valve temperatures are sent to the valve cooling control and protection system. When the valve cooling control and protection system detects that at least two of the three cooling water inlet valve temperatures are abnormal, it executes the cooling water inlet valve temperature protection action.

[0048] In step S100, the valve cooling control and protection system and the valve cooling system of the flexible direct current converter valve are controlled to be in a stable operating state, specifically including: starting the valve cooling control and protection system and the valve cooling system of the flexible direct current converter valve and operating them to a stable operating state, and controlling the heater in the valve cooling system to keep the inlet valve temperature of the three-way cooling water within a preset temperature range. The purpose of this is to operate each test equipment to a steady state, laying a foundation for the subsequent test steps. At this time, the inlet valve temperature of the three-way cooling water of the valve cooling system is maintained within a suitable preset temperature range. It should be noted that the temperature within the preset temperature range is less than the preset value of the over-temperature alarm.

[0049] Then, the inlet valve temperature modification device is used to modify the inlet valve temperature of the first cooling water sent by the valve cooling system from the measured temperature value to the first temperature value, and then the inlet valve temperatures of the three cooling waters are continued to be sent to the valve cooling control protection system, wherein the first temperature value is greater than the over-temperature alarm preset value and less than the over-temperature lockout trip preset value.

[0050] After receiving the three-way cooling water inlet valve temperature of the valve cooling system, the valve cooling control protection system needs to determine whether to execute the first over-temperature protection action according to the first preset condition. Specifically, the valve cooling control protection system determines whether at least two of the three-way cooling water inlet valve temperatures received are greater than the over-temperature alarm preset value and the duration exceeds the first preset time threshold. If so, the valve cooling control protection system executes the first over-temperature protection action (such as issuing a cooling water inlet valve temperature over-temperature alarm); otherwise, the valve cooling control protection system does not execute the first over-temperature protection action.

[0051] In this embodiment, the purpose of step S100 is to verify that when only the first cooling water inlet valve temperature of the three cooling waters is modified, although the modified first cooling water inlet valve temperature value is greater than the over-temperature alarm preset value, the valve cooling control protection system should not perform the first protection action (such as issuing a cooling water inlet valve temperature over-temperature alarm) at this time, so the valve cooling control protection system background monitoring interface should not display the "cooling water inlet valve temperature over-temperature alarm" message. At this time, if the valve cooling control protection system background monitoring interface displays the "cooling water inlet valve temperature over-temperature alarm" message, it means that the over-temperature alarm function in the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid, that is, the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid, and there is no need to perform the following steps.

[0052] In one embodiment, before determining whether the valve cooling control protection system executes the first over-temperature protection action, it also includes: the valve cooling control protection system detects whether at least two of the three cooling water inlet valve temperatures sent up have temperatures greater than the over-temperature alarm preset value and the duration exceeds the first preset time threshold. If so, the valve cooling control protection system executes the first over-temperature protection action; if not, the valve cooling control protection system does not execute the first over-temperature protection action.

[0053] In a preferred embodiment, executing the first over-temperature protection action includes: issuing an over-temperature alarm for the cooling water inlet valve temperature; executing the second over-temperature protection action includes: issuing an over-temperature lockout tripping signal and performing a cooling water inlet valve temperature over-temperature lockout tripping.

[0054] In step S300, resetting the valve cooling control protection system and the valve cooling system includes: using the inlet valve temperature modification device to restore the inlet valve temperatures of the first cooling water and the second cooling water to the measured temperature values, and resetting the valve cooling control protection system.

[0055] It should be noted that both the first temperature value and the second temperature value are greater than the over-temperature alarm preset value and less than the over-temperature lockout trip preset value. There is no requirement for the size relationship between the first temperature value and the second temperature value. The first temperature value and the second temperature value can be the same or different.

[0056] In step S400, the inlet valve temperature modification device is used to modify the inlet valve temperature of the first cooling water sent by the valve cooling system from the measured temperature value to the third temperature value, and then the inlet valve temperatures of the three cooling waters are further sent to the valve cooling control protection system.

[0057] It should be noted that both the third temperature value and the fourth temperature value are greater than the over-temperature lockout tripping preset value, and there is no requirement for the size relationship between the third temperature value and the fourth temperature value. The third temperature value and the fourth temperature value may be the same or different.

[0058] In one embodiment, before determining whether the valve cooling control protection system has executed the second over-temperature protection action, it also includes: the valve cooling control protection system detects whether at least two of the three cooling water inlet valve temperatures sent up have temperatures greater than the over-temperature lockout tripping preset value and the duration exceeds the second preset time threshold. If so, the valve cooling control protection system executes the second over-temperature protection action; if not, the valve cooling control protection system does not execute the second over-temperature protection action.

[0059] After receiving the three-way cooling water inlet valve temperature of the valve cooling system, the valve cooling control and protection system needs to determine whether to execute the second over-temperature protection action according to the second preset condition. Specifically, the valve cooling control and protection system detects whether at least two of the three-way cooling water inlet valve temperatures sent up are greater than the over-temperature lockout tripping preset value and the duration exceeds the second preset time threshold. If so, the valve cooling control and protection system executes the second over-temperature protection action (such as sending an over-temperature lockout tripping signal and performing the cooling water inlet valve temperature over-temperature lockout tripping); otherwise, the valve cooling control and protection system does not execute the second over-temperature protection action.

[0060] It should be noted that the over-temperature alarm preset value and the over-temperature lockout trip preset value in this embodiment are pre-set, and for different flexible direct current transmission actual projects, the over-temperature alarm preset value and the over-temperature lockout trip preset value may be different. The first preset time threshold and the second preset time threshold in this embodiment are in microseconds, for example, the first preset time threshold can be set to 30 microseconds.

[0061] The present embodiment provides a detection method for the inlet valve temperature protection function of the flexible direct valve valve cooling control protection system. The inlet valve temperature modification device is used to sequentially modify the first and second cooling water inlet valve temperatures sent by the valve cooling system to temperature values ​​greater than the over-temperature alarm preset value and less than the over-temperature lockout tripping preset value, and it is judged in turn whether the valve cooling control protection system performs the first over-temperature protection action to detect whether the cooling water inlet valve temperature over-temperature alarm function in the valve cooling control protection system is valid; when the cooling water inlet valve temperature over-temperature alarm function is valid, the valve cooling control protection system and the valve cooling system are reset, and the inlet valve temperature modification device is used to sequentially modify the first and second cooling water inlet valve temperatures to temperature values ​​greater than the over-temperature lockout tripping preset value, and it is judged in turn whether the valve cooling control protection system performs the second over-temperature protection action to detect whether the cooling water inlet valve temperature over-temperature lockout tripping function in the valve cooling control protection system is valid. The present invention successively determines whether the over-temperature alarm function and the over-temperature lockout tripping function in the cooling water inlet valve temperature protection function of the flexible DC valve valve cooling control protection system are effective, and can detect the effectiveness of the valve inlet temperature protection function of the valve cooling control protection system in real time, comprehensively and accurately, and promptly discover the abnormal situation of the cooling water inlet valve temperature and execute protection actions, which can ensure the safe and stable operation of the flexible DC converter valve and improve the operating reliability and safety of the flexible DC power transmission system.

[0062] At the same time, in the process of detecting the cooling water inlet valve temperature protection function of the flexible direct current valve cooling control protection system, the present invention adopts the real valve cooling control protection system in the actual flexible direct current power transmission project. Compared with the simulation test method, the present invention has better effectiveness, authenticity and reliability.

[0063] The following is another embodiment of the detection method of the inlet valve temperature protection function of the flexible DC valve cooling control protection system provided by the present invention. This embodiment carries out a verification test on the cooling water inlet valve temperature protection function in the flexible DC converter valve cooling control protection system. The purpose is to verify the effectiveness of the cooling water inlet valve temperature protection function in the flexible DC converter valve cooling control protection system when the cooling water inlet valve temperature of the flexible DC converter valve cooling system is abnormal.

[0064] The cooling water inlet valve temperature protection function in the flexible DC converter valve cooling control protection system mainly includes the following two points:

[0065] (1) When the valve cooling control protection system detects that the temperature measurement values ​​of at least two of the three cooling water inlet temperatures sent by the valve cooling system continue to exceed the overtemperature alarm setting value T set1 And the duration t exceeds the set time threshold t set1 When the valve cooling control protection system is in the over-temperature state, the cooling water inlet valve temperature alarm should be issued. That is, the valve cooling control protection system should display the message of "cooling water inlet valve temperature over-temperature alarm" on its background monitoring interface to send an alarm to the operation and maintenance personnel, reminding them to take measures;

[0066] (2) When the valve cooling control protection system detects that the temperature of at least two of the three cooling water inlet temperatures sent by the valve cooling system continuously exceeds the over-temperature lockout trip setting value T set2 (T set2 >T set1 ) and the duration t exceeds the set time threshold t set2 When the temperature of the cooling water inlet valve is too high, the valve cooling control protection system will send out an over-temperature lockout trip signal and perform a cooling water inlet valve over-temperature lockout trip. That is, the valve cooling control protection system should output an over-temperature lockout trip signal and display the message "cooling water inlet valve over-temperature lockout trip" on its background monitoring interface.

[0067] This embodiment includes the following steps:

[0068] Step 1: Start the valve cooling control protection system of the flexible DC converter valve, and start the valve cooling system of the flexible DC converter valve and operate it to a stable operating state. The heater in the valve cooling system is controlled to keep the cooling water inlet valve temperature at the rated temperature (appropriate target temperature) T N Nearby, among them, T N <T set1 , T set1 It is the preset value of over temperature alarm.

[0069] Step 2: Start the cooling water inlet valve temperature measurement value modification device (hereinafter referred to as the inlet valve temperature modification device), and use the inlet valve temperature modification device to modify the first cooling water inlet valve temperature of the three cooling waters sent by the valve cooling system, and modify the first cooling water inlet valve temperature from the measured temperature value to the first temperature value T in1 , where T set2 >T in1 >T set1 , T set2 It is the preset value for over-temperature lockout tripping; the inlet valve temperatures of the other two cooling water lines are not modified, that is, the inlet valve temperatures of the other two cooling water lines are still the measured temperature values, and then the inlet valve temperatures of the three cooling water lines are continued to be sent to the valve cooling control protection system.

[0070] In one embodiment of the present invention, after receiving the three-way cooling water inlet valve temperature of the valve cooling system, the valve cooling control protection system needs to determine whether to execute the first over-temperature protection action according to the first preset condition. Specifically, the valve cooling control protection system detects whether at least two of the three-way cooling water inlet valve temperatures received are greater than the over-temperature alarm preset value and the duration exceeds the first preset time threshold. If so, the valve cooling control protection system executes the first over-temperature protection action (such as issuing a cooling water inlet valve temperature over-temperature alarm); otherwise, the valve cooling control protection system does not execute the first over-temperature protection action.

[0071] Step three: Determine whether the valve cooling control protection system has executed the first over-temperature protection action (such as issuing a cooling water inlet valve temperature over-temperature alarm). If the valve cooling control protection system issues a cooling water inlet valve temperature over-temperature alarm, it means that the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid; otherwise, continue with step four.

[0072] In step 3, since only the first cooling water inlet temperature T in1 Exceeding the preset value of the over-temperature alarm, therefore, the valve cooling control protection system will not issue a cooling water inlet valve temperature over-temperature alarm, that is, the valve cooling control protection system background monitoring interface should not display the "cooling water inlet valve temperature over-temperature alarm" message. At this time, if the valve cooling control protection system background monitoring interface displays the "cooling water inlet valve temperature over-temperature alarm" message, it means that the over-temperature alarm function in the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid, and there is no need to perform the following steps.

[0073] It should be noted that step three is to further confirm, based on step two, that the background monitoring interface of the valve cooling control protection system does not display the message of "cooling water inlet valve temperature over-temperature alarm".

[0074] Step 4: Continue to modify the second cooling water inlet valve temperature of the three cooling waters sent by the valve cooling system through the cooling water inlet valve temperature measurement value modification device, and modify the second cooling water inlet valve temperature from the measured temperature value to the second temperature value T in2 , where T set2 >T in2 >T set1 , T set2 It is the preset value for over-temperature lockout tripping. The remaining third cooling water inlet valve temperature is not modified, that is, the third cooling water inlet valve temperature is still the measured temperature value. Then the three cooling water inlet valve temperatures are continuously sent to the valve cooling control protection system.

[0075] It should be noted that step 4 is to verify the modified temperature value T of two cooling water inlet valves among the three cooling water inlet valves measured temperature. in1 , T in2 , so that it meets the preset conditions of the first over-temperature protection action, the background monitoring interface of the valve cooling control protection system should display the message of "cooling water inlet valve temperature over-temperature alarm".

[0076] Step 5: Determine whether the valve cooling control protection system has executed the first over-temperature protection action (such as issuing a cooling water inlet valve temperature over-temperature alarm). If the valve cooling control protection system issues a cooling water inlet valve temperature over-temperature alarm, it means that the over-temperature alarm function in the cooling water inlet valve temperature protection function of the valve cooling control protection system is valid. Continue to execute the subsequent steps to further determine whether the over-temperature lockout tripping function is valid; otherwise, it means that the over-temperature alarm function of the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid, and there is no need to perform the subsequent steps.

[0077] In step 5, since the inlet valve temperature T of the first cooling water and the second cooling water in the valve cooling system is in1 If both exceed the preset value of over-temperature alarm, that is, the inlet valve temperature of two cooling water lines in the valve cooling system has exceeded the preset value of over-temperature alarm, when the duration exceeds the first preset time threshold, the valve cooling control protection system will issue a cooling water inlet valve temperature over-temperature alarm, that is, the background monitoring interface of the valve cooling control protection system should display the message of "cooling water inlet valve temperature over-temperature alarm". At this time, if the background monitoring interface of the valve cooling control protection system displays the message of "cooling water inlet valve temperature over-temperature alarm" to warn the operation and maintenance personnel, it means that the over-temperature alarm function in the cooling water inlet valve temperature protection function of the valve cooling control protection system is effective, reset the valve cooling control protection system and the valve cooling system, and then execute step 6 for further judgment.

[0078] It should be noted that step 5 is to further confirm the message "cooling water inlet valve temperature over-temperature alarm" displayed on the background monitoring interface of the valve cooling control protection system based on step 4, and at the same time, in1 , T in2 The value is restored to the actual inlet valve temperature value to lay the foundation for step six.

[0079] Specifically, the reset valve cooling control protection system and the valve cooling system include: using the cooling water inlet valve temperature measurement value modification device to modify the first temperature value T in1 , the second temperature value T in2 Restore to the actual measured temperature value before modification, and reset the valve cooling control protection system (cancel the over-temperature alarm message and restore to the initial normal state).

[0080] Step 6: After resetting, the cooling water inlet valve temperature measurement value modification device is used again to modify the first cooling water inlet valve temperature of the three cooling waters sent by the valve cooling system, and the first cooling water inlet valve temperature is modified from the measured temperature value to the third temperature value T in3 , where T in3 >T set2 , T set2The preset value for over-temperature lockout tripping; the inlet valve temperatures of the other two cooling water lines are not modified, that is, the inlet valve temperatures of the other two cooling water lines are still the measured temperature values, and then the inlet valve temperatures of the three cooling water lines continue to be sent to the valve cooling control protection system;

[0081] It should be noted that after the valve cooling control and protection system receives the three-way cooling water inlet valve temperature of the valve cooling system, the valve cooling control and protection system needs to determine whether to execute the second over-temperature protection action according to the second preset condition. Specifically, the valve cooling control and protection system detects whether at least two of the three cooling water inlet valve temperatures received are greater than the over-temperature lockout tripping preset value and the duration exceeds the second preset time threshold. If so, the valve cooling control and protection system executes the second over-temperature protection action (such as sending an over-temperature lockout tripping signal and performing the cooling water inlet valve temperature over-temperature lockout tripping); otherwise, the valve cooling control and protection system does not execute the second over-temperature protection action.

[0082] Step seven: Determine whether the valve cooling control protection system has executed the second over-temperature protection action (such as sending an over-temperature lockout tripping signal and performing a cooling water inlet valve temperature over-temperature lockout tripping). If the valve cooling control protection system sends an over-temperature lockout tripping signal and performs a cooling water inlet valve temperature over-temperature lockout tripping, it means that the cooling water inlet valve temperature protection function (over-temperature lockout tripping function) of the valve cooling control protection system is invalid; otherwise, continue to step eight.

[0083] In step 7, since only the first cooling water in the valve cooling system has an inlet valve temperature T in3 Exceeding the preset value of over-temperature lockout tripping, therefore, the valve cooling control protection system will not send out an over-temperature lockout tripping signal, nor will it perform the cooling water inlet valve temperature over-temperature lockout tripping, that is, the valve cooling control protection system should not output a lockout tripping signal and the valve cooling control protection system background monitoring interface should not display the "cooling water inlet valve temperature over-temperature alarm" message. At this time, if the valve cooling control protection system sends out an over-temperature lockout tripping signal or the valve cooling control protection system background monitoring interface displays the "cooling water inlet valve temperature over-temperature alarm" message, it means that the cooling water inlet valve temperature protection function (over-temperature lockout tripping function) of the valve cooling control protection system is invalid, and there is no need to perform the following steps.

[0084] Step 8: Continue to use the cooling water inlet valve temperature measurement value modification device to modify the second cooling water inlet valve temperature of the three cooling waters sent by the valve cooling system, and modify the second cooling water inlet valve temperature from the measured temperature value to the fourth temperature value T in4 , where T in4 >T set2 , T set2The over-temperature lockout tripping preset value, the remaining third cooling water inlet valve temperature is not modified, that is, the third cooling water inlet valve temperature is still the measured temperature value, and then the three cooling water inlet valve temperatures continue to be sent to the valve cooling control protection system;

[0085] Step nine: Determine whether the valve cooling control protection system has executed the second over-temperature protection action (such as sending an over-temperature lockout tripping signal and performing a cooling water inlet valve temperature over-temperature lockout tripping). If the valve cooling control protection system sends an over-temperature lockout tripping signal and performs a cooling water inlet valve temperature over-temperature lockout tripping, it means that the cooling water inlet valve temperature protection function (over-temperature lockout tripping function) of the valve cooling control protection system is effective; otherwise, it means that the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid.

[0086] In step nine, since the inlet valve temperature T of the first cooling water and the second cooling water in the valve cooling system is in1 Both exceed the preset value of over-temperature lockout tripping, that is, the inlet valve temperature of two cooling water lines in the valve cooling system has exceeded the preset value of over-temperature lockout tripping. When the duration exceeds the second preset time threshold, the valve cooling control and protection system will send out an over-temperature lockout tripping signal and perform the cooling water inlet valve temperature over-temperature lockout tripping. At this time, if the valve cooling control and protection system sends out an over-temperature lockout tripping signal and the background monitoring interface of the valve cooling control and protection system displays the message of "cooling water inlet valve temperature over-temperature lockout tripping", it means that the over-temperature lockout tripping function in the cooling water inlet valve temperature protection function of the valve cooling control and protection system is effective, otherwise, it means that the over-temperature lockout tripping function in the cooling water inlet valve temperature protection function of the valve cooling control and protection system is invalid.

[0087] Then, the third temperature value T in3 , the fourth temperature value T in4 Restore to the actual measured temperature value before modification, and reset the valve cooling control protection system. At this point, it is considered that the test of the cooling water inlet valve temperature protection function of the valve cooling control protection system has passed.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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 inlet valve temperature protection function of a flexible direct valve valve cooling control protection system, characterized in that: include: The valve cooling control and protection system and the valve cooling system of the flexible direct current converter valve are controlled to be in a stable operating state, and the inlet valve temperature modification device is used to modify the inlet valve temperature of the first cooling water sent by the valve cooling system from the measured temperature value to the first temperature value, and then the inlet valve temperatures of the three cooling waters are continuously sent to the valve cooling control and protection system; Determine whether the valve cooling control protection system has executed the first over-temperature protection action, and if so, the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid; If not, the inlet valve temperature modification device is used to modify the inlet valve temperature of the second cooling water sent by the valve cooling system from the measured temperature value to the second temperature value, and then the inlet valve temperatures of the three cooling waters are continued to be sent to the valve cooling control protection system to determine whether the valve cooling control protection system has executed the first over-temperature protection action. If so, the valve cooling control protection system and the valve cooling system are reset to execute the next step; if not, the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid; The inlet valve temperature modification device is used to modify the inlet valve temperature of the first cooling water sent by the valve cooling system from the measured temperature value to the third temperature value, and then the inlet valve temperatures of the three cooling waters are continuously sent to the valve cooling control and protection system; Determine whether the valve cooling control protection system has executed the second over-temperature protection action, and if so, the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid; If not, the inlet valve temperature modification device is used to modify the inlet valve temperature of the second cooling water sent by the valve cooling system from the measured temperature value to the fourth temperature value, and then the inlet valve temperatures of the three cooling waters are continued to be sent to the valve cooling control protection system to determine whether the valve cooling control protection system has executed the second over-temperature protection action. If so, the cooling water inlet valve temperature protection function of the valve cooling control protection system is valid; if not, the cooling water inlet valve temperature protection function of the valve cooling control protection system is invalid; Among them, the first temperature value and the second temperature value are both greater than the over-temperature alarm preset value and less than the over-temperature lockout trip preset value, and the third temperature value and the fourth temperature value are both greater than the over-temperature lockout trip preset value.

2. The method for detecting the inlet valve temperature protection function of the flexible direct valve valve cooling control protection system according to claim 1 is characterized in that: Executing the first over-temperature protection action includes: A cooling water inlet valve overtemperature alarm is issued.

3. The method for detecting the inlet valve temperature protection function of the flexible direct valve valve cooling control protection system according to claim 1 is characterized in that: Executing the second over-temperature protection action includes: An over-temperature lockout trip signal is issued and the cooling water inlet valve temperature over-temperature lockout trip is performed.

4. The method for detecting the inlet valve temperature protection function of the flexible direct valve valve cooling control protection system according to claim 1 is characterized in that: Before determining whether the valve cooling control protection system executes the first over-temperature protection action, the method further includes: The valve cooling control protection system detects whether the temperatures of at least two of the three cooling water inlet valves sent up are greater than the over-temperature alarm preset value and the duration exceeds the first preset time threshold. If so, the valve cooling control protection system performs the first over-temperature protection action; If not, the valve cooling control protection system does not perform the first over-temperature protection action.

5. The method for detecting the inlet valve temperature protection function of the flexible direct valve valve cooling control protection system according to claim 1 is characterized in that: Before determining whether the valve cooling control protection system has executed the second over-temperature protection action, the method further includes: The valve cooling control protection system detects whether the temperatures of at least two of the three cooling water inlet valves sent up are greater than the over-temperature lockout tripping preset value and the duration exceeds the second preset time threshold. If so, the valve cooling control protection system performs the second over-temperature protection action; If not, the valve cooling control protection system does not perform the second over-temperature protection action.

6. The method for detecting the inlet valve temperature protection function of the flexible direct valve valve cooling control protection system according to claim 1 is characterized in that: The valve cooling control protection system and valve cooling system of the flexible direct current converter valve are in stable operation, including: The valve cooling control protection system and valve cooling system of the flexible direct current converter valve are started and operated to a stable operating state, and the heater in the valve cooling system is controlled to keep the inlet valve temperature of the three-way cooling water within a preset temperature range.

7. The method for detecting the inlet valve temperature protection function of the flexible direct valve valve cooling control protection system according to claim 6 is characterized in that: The temperature within the preset temperature range is lower than the over-temperature alarm preset value.

8. The method for detecting the inlet valve temperature protection function of the flexible direct valve valve cooling control protection system according to claim 1 is characterized in that: Resetting the valve cooling control protection system and the valve cooling system comprises: The inlet valve temperature modification device is used to restore the inlet valve temperatures of the first cooling water and the second cooling water to the actually measured temperature values, and the valve cooling control protection system is reset.

9. The method for detecting the inlet valve temperature protection function of the flexible direct valve valve cooling control protection system according to claim 1 is characterized in that: The first temperature value is the same as or different from the second temperature value.

10. The method for detecting the inlet valve temperature protection function of the flexible direct valve valve cooling control protection system according to claim 1 is characterized in that: The third temperature value is the same as or different from the fourth temperature value.

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