Whole-tower pressurization test system and method for flexible direct current valve sub-module

Abstract

This invention discloses a tower-wide pressure testing system and method for flexible DC-DC converter valve submodules. The system includes a valve control system, a testing device, a dedicated testing optical fiber, and connecting circuits. The valve control system is communicatively connected to the testing device via the dedicated testing optical fiber. The testing device is electrically connected to each submodule of the flexible DC-DC converter valve via the connecting circuits. The valve control system, based on its integrated tower-wide pressure testing software, controls the testing device and the submodules, sequentially performing tower-wide pressure testing on each submodule according to a preset testing procedure. This invention achieves unified automated testing of all submodules, avoiding the inconsistencies and omissions associated with manual operation, improving testing efficiency and accuracy, and enabling timely detection of potential faults, thus ensuring the reliability and stability of the flexible DC-DC converter valve in actual operation.

Description

Technical Field

[0001] This invention relates to a tower-wide pressurization test of a flexible DC converter valve submodule, and more specifically, to a tower-wide pressurization test system and method for a flexible DC converter valve submodule. Background Technology

[0002] In high-voltage direct current (HVDC) transmission systems, the converter valve submodules need to undergo full-tower pressure testing to ensure their reliability and stability during actual operation. The significance of this full-tower pressure testing lies in simulating actual operating conditions in an experimental environment to verify the pressure and electrical performance of each submodule. This allows for the timely detection of potential problems, prevention of failures, and assurance of the system's safe and stable operation.

[0003] In existing technologies, testers often need to manually connect test equipment to various submodules. This manual plugging and unplugging of optical fibers is not only time-consuming and labor-intensive, but also prone to human error. After testing one submodule, the tester needs to unplug the optical fiber and then connect it to the next submodule. This repetitive manual operation is not only inefficient, but may also lead to discontinuous testing due to human factors, or even connection errors or omissions, thus affecting the comprehensiveness and accuracy of the test.

[0004] Therefore, existing technologies lack a more efficient and automated whole-tower pressurization test scheme for flexible DC converter valve submodules. Summary of the Invention

[0005] In order to solve at least one of the technical problems in the background art, the present invention proposes a system and method for pressurizing and testing a flexible DC converter valve submodule tower.

[0006] In one aspect, the present invention provides a tower pressurization test system for a flexible DC converter valve submodule, the system comprising: a valve control system, a test device, a dedicated test optical fiber and a connection circuit; The valve control system is communicatively connected to the testing device via the dedicated testing optical fiber; the testing device is electrically connected to each sub-module of the flexible DC converter valve via the connection circuit; the valve control system, based on its integrated whole-tower pressurization testing software, controls the testing device and the sub-modules, and sequentially performs whole-tower pressurization tests on each sub-module according to a preset testing procedure.

[0007] Optionally, the testing apparatus includes: The charging circuit is used to charge the DC capacitor of the submodule when the submodule is started for testing, so that the submodule reaches the normal operating voltage. A discharge circuit is used to release energy from the residual voltage of the DC capacitor after the test of the submodule is completed. The sampling loop is used to collect the port voltage of the submodule during the test and upload it to the valve control system.

[0008] Optionally, the valve control system is specifically used to, when testing any submodule, first send a start test command to the testing device, causing the testing device to charge the DC capacitor of the submodule using a charging circuit, so that the submodule reaches its normal operating voltage; then perform various tests on the submodule according to the test procedure; after the test is completed, send a stop test command to the testing device, causing the testing device to discharge the residual voltage of the DC capacitor using a discharge circuit.

[0009] Optionally, the tests include: submodule power-on time test; The valve control system is specifically used to, during the submodule power-on time test, issue test commands to control the test device to charge the DC capacitor of the submodule, and record the time interval from the start of charging of the submodule to the establishment of a communication connection between the submodule and the valve control system; after receiving the power-on time of the submodule from the test device, it compares the power-on time of the submodule with the power-on time of other submodules to determine whether the power-on time of the submodule is abnormal; if the submodule continuously displays an uplink communication failure during the power-on process, it is determined that the submodule has a power-on abnormality.

[0010] Optionally, the tests include: submodule software version verification; The valve control system is specifically used to read the software version number of a submodule when performing submodule software version verification, and compare the software version number with a preset software version number. If they match, the submodule software version is determined to be correct; if they do not match, the submodule is determined to have a software version mismatch problem.

[0011] Optionally, the tests include: submodule communication function testing; The valve control system is specifically used to send test commands to the sub-module and adjacent sub-modules during sub-module communication function testing, and to receive the communication status feedback from the sub-module and the adjacent sub-module; when the communication status is inconsistent with the command sent by the valve control system, it is determined that the sub-module has a downlink communication failure; when the automatic change status of the sub-module or the adjacent sub-module is inconsistent with the corresponding status received by the valve control system, it is determined that the sub-module has an uplink communication failure.

[0012] Optionally, the tests include: submodule power board function tests; The valve control system is specifically used to read the power board status information fed back by the submodule when performing functional tests on the submodule power board. When the submodule is configured with a redundant power supply, the status of the redundant power supply board is also verified. If the submodule reports a power supply abnormality alarm, the submodule is retested, and the system determines whether it needs to be replaced based on the on-site operating conditions.

[0013] Optionally, the tests include: submodule voltage acquisition function test; The valve control system is specifically used to read the capacitor voltage sampling data fed back by the submodule when performing a submodule voltage acquisition function test, and compare the voltage sampling data with the port voltage of the submodule acquired by the test device through the sampling loop. If the two are inconsistent and the error exceeds the threshold, it is determined that the submodule has an abnormal voltage acquisition function.

[0014] Optionally, the tests include: turn-on / turn-off tests of the fully controlled power devices in the submodule; The valve control system is specifically used to issue turn-on and turn-off commands to the submodule when performing turn-on / turn-off tests on the fully controlled power devices of the submodule, and to receive the actual device status fed back by the submodule. When the actual device status is inconsistent with the command, it is determined that the submodule has an abnormality in the turn-on or turn-off of the fully controlled power devices.

[0015] Optionally, the tests include: mechanical characteristic test of the submodule bypass switch; The valve control system is specifically used to issue a bypass switch closing command to the submodule or automatically trigger the bypass switch closing action by simulating an undervoltage fault when performing mechanical characteristic tests on the submodule bypass switch, and to record the main contact closing time and auxiliary contact signal return time of the submodule bypass switch; when the closed state of the bypass switch cannot be detected, or the main contact closing time or the auxiliary contact signal return time deviates from the preset design value range, it is determined that the bypass switch of the submodule has abnormal mechanical characteristics.

[0016] In another aspect, the present invention provides a method for pressurizing a flexible DC converter valve submodule across an entire tower. This method is applied to the aforementioned pressurizing test system for a flexible DC converter valve submodule across an entire tower. The method includes: In maintenance or test mode, the valve control system conducts whole-tower pressurization tests. Based on its integrated whole-tower pressurization test software, it controls the test device and sub-modules and tests each sub-module in sequence according to the preset test process. When testing any submodule, the valve control system first sends a start test command to the testing device, so that the testing device uses the charging circuit to charge the DC capacitor of the submodule, so that the submodule reaches the normal operating voltage. The valve control system performs various tests on the submodule according to the test procedure. After the test is completed, the valve control system sends a test end command to the test device, causing the test device to discharge the residual voltage of the DC capacitor using a discharge circuit.

[0017] The beneficial effects of this invention are as follows: This invention integrates whole-tower pressurization testing software into the valve control system and utilizes a dedicated testing fiber optic cable for communication with the testing device. The testing device is electrically connected to each sub-module via a connection circuit, enabling the valve control system to sequentially perform whole-tower pressurization tests on each sub-module according to a preset testing procedure. Unlike existing technologies that require frequent manual fiber optic cable insertion and removal, resulting in low testing efficiency and susceptibility to human error, this invention achieves unified automated testing of all sub-modules. This avoids the inconsistencies and omissions associated with manual operation, improving testing efficiency and accuracy. Consequently, it enables the timely detection of potential faults, ensuring the reliability and stability of the flexible DC converter valve during actual operation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the whole tower pressurization test system of the flexible DC converter valve submodule according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the testing device according to an embodiment of the present invention; Figure 3 This is a flowchart of the whole tower pressurization test method for the flexible DC converter valve submodule in an embodiment of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0020] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0021] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] This invention proposes a tower pressurization test system for a flexible DC converter valve submodule, such as... Figure 1 As shown, in one embodiment of the present invention, the flexible DC converter valve submodule tower pressurization test system of the present invention includes: a valve control system, a test device, a test-specific optical fiber and a connection circuit.

[0024] The valve control system is communicatively connected to the testing device via the dedicated testing optical fiber; the testing device is electrically connected to each sub-module of the flexible DC converter valve via the connection circuit; the valve control system, based on its integrated whole-tower pressurization testing software, controls the testing device and the sub-modules, and sequentially performs whole-tower pressurization tests on each sub-module according to a preset testing procedure.

[0025] In one embodiment of the present invention, the valve control system integrates whole-tower pressurization test software, which can switch to whole-tower pressurization test mode in maintenance mode or test mode. Control commands are sent through fiber optic interface chassis and dedicated test fiber optic cable for sub-module number selection, test command issuance and reset operation, thereby performing whole-tower pressurization test on sub-modules in sequence according to the preset test process.

[0026] In one embodiment of the present invention, the testing device is arranged in the valve chamber of the flexible DC converter valve, and the testing device includes a charging circuit, a discharging circuit, and a sampling circuit. The charging circuit charges the DC capacitor of the submodule at the start of the test, bringing the submodule to its normal operating voltage. The discharging circuit discharges residual energy from the submodule after the test. The sampling circuit collects the port voltage of the submodule during the test and uploads it to the valve control system. The connection circuit enables independent control of the submodules connected in series with the test circuit, ensuring that each submodule can be functionally tested one by one.

[0027] In one embodiment of the present invention, the connection circuit is used to achieve independent control of the submodules entering the test loop. Specifically, under the control of the valve control system, the connection circuit can selectively connect or disconnect the submodule under test from the test loop, thereby ensuring that only one submodule is under test at a time, avoiding data interference caused by multiple submodules participating in the test simultaneously. Through the setting of this connection circuit, the valve control system can control each submodule to enter the test loop one by one according to the preset test procedure, and sequentially complete the power-on, functional detection, and bypass switch characteristic test of the submodule. Thus, the embodiment of the present invention can achieve independent management of the entry and exit of submodules from the test loop, improve the flexibility and accuracy of the whole tower pressurization test, and ensure the validity of the test results.

[0028] Through the above settings, the flexible DC converter valve submodule tower pressurization test system of this invention can conduct batch and automated tower pressurization tests without manual fiber optic cable insertion and removal, avoiding the problems of low testing efficiency and easy introduction of human error in the prior art. Compared with the existing sampling inspection method, this embodiment realizes the transformation from submodule sampling inspection to full-scale testing, and can comprehensively test functions including submodule power-on time, software version, communication function, power board, voltage acquisition, turn-on / turn-off of fully controlled power devices, and bypass switch mechanical characteristics. Test results are stored separately according to submodule number. For test items with numerical measurement, it also supports overall storage and horizontal and vertical comparative analysis, thereby improving the comprehensiveness and accuracy of the test and facilitating subsequent data management and operational status evaluation.

[0029] like Figure 2 As shown, in one embodiment of the present invention, the testing device specifically includes: The charging circuit is used to charge the DC capacitor of the submodule when the submodule is started for testing, so that the submodule reaches the normal operating voltage. A discharge circuit is used to release energy from the residual voltage of the DC capacitor after the test of the submodule is completed. The sampling loop is used to collect the port voltage of the submodule during the test and upload it to the valve control system.

[0030] In one embodiment of the present invention, the testing device includes a charging circuit, a discharging circuit, and a sampling circuit. The charging circuit charges the DC capacitor of the submodule when testing is initiated, enabling the submodule to reach its normal operating voltage and enter a testable state, i.e., the submodule is powered on. The discharging circuit discharges residual voltage from the submodule's DC capacitor after testing, preventing residual charge from affecting subsequent testing or submodule operation. The sampling circuit collects the port voltage of the submodule in real time during testing and uploads the port voltage data to the valve control system for comparison and analysis. Through these settings, the testing device can perform charging, discharging, and voltage acquisition of the submodule during the entire tower pressurization test, ensuring the integrity and safety of the testing process and providing data support for the valve control system to accurately determine the operating status of the submodule.

[0031] In one embodiment of the present invention, the valve control system is specifically used to, when testing any submodule, first send a start test command to the testing device, so that the testing device charges the DC capacitor of the submodule using a charging circuit, so that the submodule reaches the normal operating voltage; then perform various tests on the submodule according to the test procedure; after the test is completed, send a stop test command to the testing device, so that the testing device discharges the energy of the residual voltage of the DC capacitor using a discharge circuit.

[0032] In one embodiment of the present invention, the valve control system is used to uniformly control the testing process of submodules. Specifically, when testing any submodule, the valve control system first sends a start test command to the testing device, causing the testing device to charge the DC capacitor of the submodule through a charging circuit, so that the submodule reaches its normal operating voltage and enters a testable state. Subsequently, the valve control system performs power-on time testing, software version verification, communication function testing, power board function testing, voltage acquisition function testing, fully controlled power device turn-on / turn-off testing, and bypass switch mechanical characteristic testing on the submodule in sequence according to a preset test procedure. After the above tests are completed, the valve control system sends a stop test command to the testing device, causing the testing device to discharge the residual voltage of the DC capacitor of the submodule through a discharge circuit, thereby ensuring that the submodule is in a safe state and facilitating subsequent testing.

[0033] In one embodiment of the present invention, the tests include: submodule power-on time test; The valve control system is specifically used to, during the submodule power-on time test, issue test commands to control the test device to charge the DC capacitor of the submodule, and record the time interval from the start of charging of the submodule to the establishment of a communication connection between the submodule and the valve control system; after receiving the power-on time of the submodule from the test device, it compares the power-on time of the submodule with the power-on time of other submodules to determine whether the power-on time of the submodule is abnormal; if the submodule continuously displays an uplink communication failure during the power-on process, it is determined that the submodule has a power-on abnormality.

[0034] In one embodiment of the present invention, during the submodule power-on time test, the valve control system issues a test command to control the test device to charge the DC capacitor of the submodule and records the time interval from the start of charging of the submodule to the moment when the submodule establishes a communication connection with the valve control system; this time interval is the power-on time. After completing the power-on process, the test device feeds back the power-on time of the submodule to the valve control system. The valve control system further compares the power-on time of the submodule with the power-on times of other submodules to determine whether the power-on time of the submodule deviates from a preset range, thereby determining whether the submodule is abnormal. When the valve control system continuously displays an uplink communication failure during the power-on process, it indicates that the submodule failed to establish a communication connection with the valve control system during the entire charging process. In this case, a valid power-on time cannot be obtained, and the submodule is directly determined to have a power-on abnormality.

[0035] In one embodiment of the present invention, the tests include: submodule software version verification; The valve control system is specifically used to read the software version number of a submodule when performing submodule software version verification, and compare the software version number with a preset software version number. If they match, the submodule software version is determined to be correct; if they do not match, the submodule is determined to have a software version mismatch problem.

[0036] In one embodiment of the present invention, when performing submodule software version verification, the valve control system reads the software version number fed back by the submodule under test and compares the software version number with a preset software version number. If the two match, the software version of the submodule is determined to be correct and can meet the operating requirements; if the two do not match, the submodule is determined to have a software version mismatch problem, and a software upgrade and subsequent retesting are prompted for the submodule to ensure that the submodule meets the system's operational standards and consistency.

[0037] In one embodiment of the present invention, the tests include: submodule communication function test; The valve control system is specifically used to send test commands to the sub-module and adjacent sub-modules during sub-module communication function testing, and to receive the communication status feedback from the sub-module and the adjacent sub-module; when the communication status is inconsistent with the command sent by the valve control system, it is determined that the sub-module has a downlink communication failure; when the automatic change status of the sub-module or the adjacent sub-module is inconsistent with the corresponding status received by the valve control system, it is determined that the sub-module has an uplink communication failure.

[0038] In one embodiment of the present invention, during submodule communication function testing, the valve control system sends test commands to the submodule under test and its adjacent submodules, and receives communication status feedback from the submodule and its adjacent submodules. The valve control system compares the received communication status with the sent commands one by one. When it finds that the feedback status is inconsistent with the sent commands, it determines that the submodule has a downlink communication fault, that is, the control commands sent by the valve control system have not been correctly transmitted to the submodule. Further, the valve control system is also used to detect the automatic position change status of the submodule and its adjacent submodules, and compare it with the corresponding status received by the valve control system. If the two are inconsistent, it determines that the submodule has an uplink communication fault, that is, the actual status information of the submodule has not been correctly uploaded to the valve control system. Through the above tests, the downlink and uplink communication links can be bidirectionally verified during the pressurization process of the entire tower, ensuring the reliability of communication between the submodule and the valve control system, and timely detecting communication link anomalies, thereby providing a guarantee for the safe operation of the system.

[0039] In one embodiment of the present invention, the tests include: submodule power board function test; The valve control system is specifically used to read the power board status information fed back by the submodule when performing functional tests on the submodule power board. When the submodule is configured with a redundant power supply, the status of the redundant power supply board is also verified. If the submodule reports a power supply abnormality alarm, the submodule is retested, and the system determines whether it needs to be replaced based on the on-site operating conditions.

[0040] In one embodiment of the present invention, during the functional testing of the submodule power supply board, the valve control system reads the power supply board status information fed back by the submodule under test to determine whether the power supply board is working properly. When the submodule is configured with a redundant power supply, the valve control system also synchronously verifies the status of the redundant power supply board to ensure that both the main power supply and the redundant power supply can meet the operating requirements. If the valve control system detects a power abnormality alarm in the status information fed back by the submodule, it performs a retest on the submodule to rule out the possibility of temporary abnormalities. If the retest result still shows an abnormality, the valve control system comprehensively determines whether the submodule needs to be replaced based on the on-site operating conditions, thereby avoiding the impact of power supply failure on the normal operation of the submodule and the overall tower operation stability.

[0041] In one embodiment of the present invention, the tests include: submodule voltage acquisition function test; The valve control system is specifically used to read the capacitor voltage sampling data fed back by the submodule when performing a submodule voltage acquisition function test, and compare the voltage sampling data with the port voltage of the submodule acquired by the test device through the sampling loop. If the two are inconsistent and the error exceeds the threshold, it is determined that the submodule has an abnormal voltage acquisition function.

[0042] In one embodiment of the present invention, during the submodule voltage acquisition function test, the valve control system reads the capacitor voltage sampling data fed back by the submodule under test and compares the sampling data with the submodule port voltage acquired in real time by the testing device through the sampling loop. When the comparison result shows that the two are inconsistent and the error exceeds a preset threshold (e.g., ±5%), it is determined that the submodule has an abnormal voltage acquisition function. Through the above test, the accuracy and stability of the submodule voltage acquisition channel can be effectively verified, avoiding control inaccuracies or abnormal protection actions caused by voltage detection errors, thereby improving the reliability of the whole tower pressurization test.

[0043] In one embodiment of the present invention, the tests include: turn-on / turn-off test of the fully controlled power device of the submodule; The valve control system is specifically used to issue turn-on and turn-off commands to the submodule when performing turn-on / turn-off tests on the fully controlled power devices of the submodule, and to receive the actual device status fed back by the submodule. When the actual device status is inconsistent with the command, it is determined that the submodule has an abnormality in the turn-on or turn-off of the fully controlled power devices.

[0044] In one embodiment of the present invention, during the turn-on / turn-off test of the fully controllable power device in a submodule, the valve control system issues turn-on and turn-off commands for the fully controllable power device to the submodule under test, and receives the actual device status feedback from the submodule in real time. The valve control system compares the actual status with the issued commands for consistency. When the feedback device status is inconsistent with the commands, it is determined that the submodule has an abnormal turn-on or turn-off of the fully controllable power device. Through the above test, the turn-on and turn-off performance of the fully controllable power device can be effectively verified, abnormal device operation can be detected in a timely manner, and the switching reliability of the submodule during the operation of the entire tower can be ensured, thereby improving the safety and stability of the system.

[0045] In one embodiment of the present invention, the tests include: mechanical characteristic test of submodule bypass switch; The valve control system is specifically used to issue a bypass switch closing command to the submodule or automatically trigger the bypass switch closing action by simulating an undervoltage fault when performing mechanical characteristic tests on the submodule bypass switch, and to record the main contact closing time and auxiliary contact signal return time of the submodule bypass switch; when the closed state of the bypass switch cannot be detected, or the main contact closing time or the auxiliary contact signal return time deviates from the preset design value range, it is determined that the bypass switch of the submodule has abnormal mechanical characteristics.

[0046] In one embodiment of the present invention, during the mechanical characteristic test of the bypass switch of a submodule, the valve control system issues a bypass switch closing command to the submodule under test, or automatically triggers the bypass switch closing action of the submodule by simulating an undervoltage fault, and records the main contact closing time and auxiliary contact signal return time of the bypass switch in real time during the test. The valve control system compares and judges the recorded data. When the closed state of the bypass switch cannot be detected, or the detection results show that the main contact closing time and auxiliary contact signal return time deviate from the preset design value range, it is determined that the bypass switch of the submodule has abnormal mechanical characteristics. Through the above test, the sensitivity and reliability of the bypass switch can be fully verified, mechanical characteristic deviations or faults can be detected in a timely manner, and problems such as failure to operate or false operation of the bypass switch in actual operation can be avoided, thereby improving the operational safety of the flexible DC converter valve submodule and the stability of the entire tower system.

[0047] In one embodiment of the present invention, the whole-tower pressurization test further includes selective testing. Specifically, during the whole-tower pressurization test, when the valve control system detects an anomaly in the test results of an individual submodule, the valve control system can re-include that submodule or a group of adjacent submodules in the test process by resetting the numbering range of the test modules for retesting.

[0048] In one embodiment of the present invention, the valve control system allows maintenance personnel to input a new range of test module numbers through the human-machine interface of the whole-tower pressurization test software. For example, this could involve selecting only the single module exhibiting an anomaly, or selecting several modules before and after the anomaly module for retesting. Upon receiving the new number range, the valve control system controls the testing device and connecting circuits to perform charging, discharging, voltage acquisition, and various functional tests only on modules within the specified number range. Through this selective testing setting, when a test anomaly occurs, it is unnecessary to retest all sub-modules of the entire tower. Instead, targeted retesting of sub-modules can be performed, avoiding the waste of time and resources associated with repetitive testing. Furthermore, it allows for quick confirmation of whether the anomaly is an intermittent interference or a genuine module failure, thereby improving the flexibility and efficiency of the testing process and ensuring the accuracy and traceability of the test results.

[0049] In one embodiment of the present invention, the whole-tower pressurization test also includes a test result storage function. Specifically, after each submodule completes its functional test, the valve control system classifies and stores the acquired test results: on the one hand, the valve control system stores the functional test results of each submodule separately according to the submodule number, thereby realizing independent traceability and location of a single submodule, which is convenient for subsequent maintenance and analysis; on the other hand, for test items involving numerical measurement, such as voltage acquisition function test, power-on time test, bypass switch action time test, etc., the valve control system also has an overall storage function, that is, while retaining the individual results of each submodule, it centrally stores and manages the test data of all submodules in a unified manner.

[0050] In this way, the valve control system can not only accurately manage the test results of individual submodules, but also perform horizontal and vertical comparative analysis of the numerical measurement data of all submodules at the overall level. For example, it can horizontally compare the voltage acquisition data of different submodules in the same batch to identify submodules with abnormal deviations; it can also vertically compare the test results of the same submodule at different time periods to evaluate its performance change trend. Therefore, the test result saving function of this embodiment of the invention significantly improves the availability and traceability of test data, providing reliable data support for subsequent operation and maintenance, fault diagnosis, and life assessment.

[0051] As can be seen from the above embodiments, the flexible DC converter valve submodule tower pressurization test system of the present invention has the following advantages compared with the prior art: 1. Automation and efficiency: The whole tower pressurization test software is integrated into the valve control system. Through the fiber optic network and the test device, the automated testing of all tower sub-modules is realized, avoiding frequent manual plugging and unplugging of fiber optic cables and greatly improving the testing efficiency.

[0052] 2. Comprehensiveness and accuracy: The testing device and valve control system work together to complete multiple tests on the submodules, including power-on, function, electrical parameters, and bypass switch mechanical characteristics. This achieves a shift from spot checks to full-scale testing, with comprehensive test coverage and accurate results.

[0053] 3. Flexibility and traceability: It supports selective testing and anomaly retesting, and stores test results separately according to submodule number. At the same time, it stores numerical data as a whole, which facilitates horizontal and vertical data comparison and analysis, and realizes the traceability of results and trend evaluation.

[0054] 4. Safety and Reliability: The design of charging circuit, discharging circuit and sampling circuit ensures the safe operation of the submodule during the test process and avoids the influence of residual voltage; at the same time, communication verification, voltage acquisition, power device switching and other tests ensure the operational reliability of the submodule and the whole tower system.

[0055] In another aspect, the present invention provides a method for pressurizing the entire tower of a flexible DC converter valve submodule, which is applied to the aforementioned pressurizing test system for the entire flexible DC converter valve submodule. It should be noted that embodiments of the pressurizing test method for the entire flexible DC converter valve submodule of the present invention can be referenced from embodiments of the pressurizing test system for the entire flexible DC converter valve submodule.

[0056] like Figure 3 As shown, in one embodiment of the present invention, the method includes steps S101 to S104.

[0057] In step S101, the valve control system conducts a whole-tower pressurization test in maintenance or test mode. Based on its integrated whole-tower pressurization test software, the system controls the test device and sub-modules and tests each sub-module sequentially according to the preset test procedure.

[0058] In step S102, when testing any submodule, the valve control system first sends a start test command to the testing device, so that the testing device uses the charging circuit to charge the DC capacitor of the submodule, so that the submodule reaches the normal operating voltage.

[0059] Step S103: The valve control system performs various tests on the submodule according to the test procedure.

[0060] Step S104: After the test is completed, the valve control system sends a test end command to the test device, so that the test device uses the discharge circuit to discharge the energy of the residual voltage of the DC capacitor.

[0061] In one embodiment of the present invention, the method for pressurizing the entire tower of a flexible DC converter valve submodule is applied to a pressurizing test system for the entire tower of a flexible DC converter valve submodule. Specifically, the valve control system switches to the entire tower pressurizing test mode in either maintenance or test mode. Through its integrated test software, it uniformly controls the test device and each submodule, and sequentially performs the entire tower pressurizing test on each submodule according to a preset test procedure.

[0062] During the specific testing process, when testing any submodule, the valve control system first sends a start test command to the testing device. After receiving the command, the testing device uses its internal charging circuit to charge the DC capacitor of the submodule, bringing it to its normal operating voltage and into a testable state. Subsequently, the valve control system performs functional tests on the submodule according to the preset test procedure, including power-on time measurement, software version verification, communication function testing, power board function testing, voltage acquisition function testing, fully controlled power device turn-on / turn-off testing, and bypass switch mechanical characteristic testing. Based on the results of each test, the system determines whether the submodule has any abnormalities.

[0063] After completing the testing of the submodule, the valve control system sends a test termination command to the testing device. The testing device uses a discharge circuit to discharge the residual voltage of the submodule's DC capacitor, thereby ensuring that the submodule is in a safe state and providing preparation conditions for subsequent submodule testing.

[0064] The tower-wide pressurization testing method for the flexible DC converter valve submodules described in the above embodiments can automate and sequentially test all submodules without manual fiber insertion or removal, significantly improving testing efficiency and ensuring the comprehensiveness and accuracy of test results. Furthermore, combined with data storage and comparative analysis mechanisms, it enables rapid retesting and traceability analysis of abnormal submodules, thereby further enhancing the safety and reliability of the entire flexible DC converter valve tower operation.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tower pressurization test system for a flexible DC converter valve submodule, characterized in that, include: Valve control system, testing equipment, dedicated optical fiber for testing and connecting circuits; The valve control system is communicatively connected to the testing device via the dedicated testing optical fiber. The testing device is electrically connected to each sub-module of the flexible DC converter valve through the connection circuit; the valve control system, based on its integrated whole-tower pressurization testing software, controls the testing device and the sub-modules to perform whole-tower pressurization tests on each sub-module in sequence according to the preset test procedure.

2. The whole-tower pressurization test system for the flexible DC converter valve submodule according to claim 1, characterized in that, The testing apparatus includes: The charging circuit is used to charge the DC capacitor of the submodule when the submodule is started for testing, so that the submodule reaches the normal operating voltage. A discharge circuit is used to release energy from the residual voltage of the DC capacitor after the test of the submodule is completed. The sampling loop is used to collect the port voltage of the submodule during the test and upload it to the valve control system.

3. The whole-tower pressurization test system for the flexible DC converter valve submodule according to claim 1 or 2, characterized in that, The valve control system is specifically used to, when testing any submodule, first send a start test command to the testing device, so that the testing device charges the DC capacitor of the submodule using a charging circuit, so that the submodule reaches the normal operating voltage; then perform various tests on the submodule according to the test procedure; after the test is completed, send a stop test command to the testing device, so that the testing device discharges the energy of the residual voltage of the DC capacitor using a discharge circuit.

4. The whole-tower pressurization test system for the flexible DC converter valve submodule according to claim 3, characterized in that, The tests include: submodule power-on time test; The valve control system is specifically used to, during the submodule power-on time test, issue test commands to control the test device to charge the DC capacitor of the submodule, and record the time interval from the start of charging of the submodule to the establishment of a communication connection between the submodule and the valve control system; after receiving the power-on time of the submodule from the test device, it compares the power-on time of the submodule with the power-on time of other submodules to determine whether the power-on time of the submodule is abnormal; if the submodule continuously displays an uplink communication failure during the power-on process, it is determined that the submodule has a power-on abnormality.

5. The whole-tower pressurization test system for the flexible DC converter valve submodule according to claim 3, characterized in that, The tests include: submodule software version verification; The valve control system is specifically used to read the software version number of a submodule when performing submodule software version verification, and compare the software version number with a preset software version number. If they match, the submodule software version is determined to be correct; if they do not match, the submodule is determined to have a software version mismatch problem.

6. The whole-tower pressurization test system for the flexible DC converter valve submodule according to claim 3, characterized in that, The tests include: submodule communication function testing; The valve control system is specifically used to send test commands to the sub-module and adjacent sub-modules during sub-module communication function testing, and to receive the communication status feedback from the sub-module and the adjacent sub-module; when the communication status is inconsistent with the command sent by the valve control system, it is determined that the sub-module has a downlink communication failure; when the automatic change status of the sub-module or the adjacent sub-module is inconsistent with the corresponding status received by the valve control system, it is determined that the sub-module has an uplink communication failure.

7. The whole-tower pressurization test system for the flexible DC converter valve submodule according to claim 3, characterized in that, The tests include: submodule power board function test; The valve control system is specifically used to read the power board status information fed back by the submodule when performing functional tests on the submodule power board. When the submodule is configured with a redundant power supply, the status of the redundant power supply board is also verified. If the submodule reports a power supply abnormality alarm, the submodule is retested, and the system determines whether it needs to be replaced based on the on-site operating conditions.

8. The whole-tower pressurization test system for the flexible DC converter valve submodule according to claim 3, characterized in that, The tests include: submodule voltage acquisition function test; The valve control system is specifically used to read the capacitor voltage sampling data fed back by the submodule when performing a submodule voltage acquisition function test, and compare the voltage sampling data with the port voltage of the submodule acquired by the test device through the sampling loop. If the two are inconsistent and the error exceeds the threshold, it is determined that the submodule has an abnormal voltage acquisition function.

9. The whole-tower pressurization test system for the flexible DC converter valve submodule according to claim 3, characterized in that, The tests include: turn-on / turn-off test of fully controlled power devices in the submodule; The valve control system is specifically used to issue turn-on and turn-off commands to the submodule when performing turn-on / turn-off tests on the fully controlled power devices of the submodule, and to receive the actual device status fed back by the submodule. When the actual device status is inconsistent with the command, it is determined that the submodule has an abnormality in the turn-on or turn-off of the fully controlled power devices.

10. The whole-tower pressurization test system for the flexible DC converter valve submodule according to claim 3, characterized in that, The tests include: mechanical characteristic test of submodule bypass switch; The valve control system is specifically used to issue a bypass switch closing command to the submodule or automatically trigger the bypass switch closing action by simulating an undervoltage fault when performing mechanical characteristic tests on the submodule bypass switch, and to record the main contact closing time and auxiliary contact signal return time of the submodule bypass switch; when the closed state of the bypass switch cannot be detected, or the main contact closing time or the auxiliary contact signal return time deviates from the preset design value range, it is determined that the bypass switch of the submodule has abnormal mechanical characteristics.

11. A method for pressurizing a flexible DC converter valve submodule across an entire tower, characterized in that, The method, applied to the whole-tower pressurization test system for the flexible DC converter valve submodule according to any one of claims 1 to 10, comprises: In maintenance or test mode, the valve control system conducts whole-tower pressurization tests. Based on its integrated whole-tower pressurization test software, it controls the test device and sub-modules and tests each sub-module in sequence according to the preset test process. When testing any submodule, the valve control system first sends a start test command to the testing device, so that the testing device uses the charging circuit to charge the DC capacitor of the submodule, so that the submodule reaches the normal operating voltage. The valve control system performs various tests on the submodule according to the test procedure. After the test is completed, the valve control system sends a test end command to the test device, causing the test device to discharge the residual voltage of the DC capacitor using a discharge circuit.

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