Testing system and method of converter valve thyristor control unit board card

Abstract

The invention belongs to the technical field of converter valve testing, and discloses a testing system and method for a converter valve thyristor control unit board card, a main control module analyzes a testing requirement and generates a control instruction, a to-be-tested board card is connected through a multi-type interface adaptation module, a signal simulation unit outputs electric and optical testing excitation signals, and the to-be-tested board card is connected with a thyristor control unit. The data acquisition unit captures a feedback signal and returns the feedback signal to the master control unit, and external data synchronization and result output are realized in combination with the communication interaction module; according to the test system, the space occupation is obviously optimized, and the multi-device cooperation requirement is eliminated; manual voltage regulation operation is replaced by full-automatic signal control, so that the safety risk is reduced; a flexible and programmable excitation signal generation and acquisition mechanism supports rapid parameter adaptation; automatic data acquisition and processing completely eradicate personal errors, and human input is reduced; the highly integrated system architecture realizes automatic propulsion of the whole test process and report generation, and greatly improves the test efficiency and reliability.

Description

Technical Field

[0001] This invention belongs to the field of converter valve testing technology, specifically relating to a testing system and method for a converter valve thyristor control unit board. Background Technology

[0002] Currently, high-voltage direct current (HVDC) transmission has become the core transmission method in the current power system due to its significant advantages in economy, good interconnectivity, and precise control. As a key core component of HVDC transmission projects, the converter valve's operational stability directly determines the safety and efficiency of the entire transmission system. The thyristor stage, with its excellent voltage withstand performance and current carrying capacity, has become the most widely used basic structural unit in converter valve equipment. The thyristor control unit (TCU), as the core control element of the thyristor stage, undertakes key functions such as thyristor triggering, detection, and protection. It does not require independent power supply; it obtains its operating power by coupling the voltage across the thyristor terminals, achieving optical isolation between high and low voltage circuits and photoelectric conversion of valve control signals. Given that each ultra-high voltage and extra-high voltage HVDC transmission project requires approximately 3000 thyristor control units, and each unit must undergo multiple routine performance tests and comprehensive functional tests, efficient and accurate TCU testing devices are of paramount importance to ensuring the quality of the transmission project.

[0003] Current testing devices and methods for thyristor control units have several shortcomings: First, the testing equipment occupies a large space, typically requiring two engineering components to complete the test, increasing site usage costs; second, voltage regulation and control rely on manual voltage regulators and transformers, which are not only cumbersome and difficult to operate, but also pose high safety risks due to the manual switching of power supplies; third, current-limiting resistors mostly use plate resistors, which are inconvenient to switch resistance values ​​and make it difficult to quickly match the optimal test parameters according to different test requirements; fourth, data acquisition and processing rely on manual operation, mostly through manual interpretation and recording of oscilloscope data, which is prone to data errors and recording mistakes, and requires a large investment of manpower, resulting in low overall test efficiency; fifth, various testing functions are scattered, lacking an integrated control and integration system, making it impossible to automate the test process and automatically generate test reports.

[0004] It is evident that existing thyristor control unit testing technologies suffer from problems such as large size, difficult operation, low safety, poor efficiency, and insufficient automation, failing to meet the industry's demand for convenience, efficiency, and high integration. Summary of the Invention

[0005] This invention provides a testing system and method for a converter valve thyristor control unit board. This system can solve the problems of large size, difficult operation, low safety, poor efficiency and insufficient automation in existing thyristor control unit testing technologies, and can meet the industry requirements of convenience, efficiency and high integration.

[0006] To achieve the above objectives, the present invention employs the following technical content: A test system for a converter valve thyristor control unit board includes: The main control module is used to parse test requirements and generate test control instructions based on the parsing results; A multi-type interface adapter module is connected to the main control module to establish communication between the main control module and the control unit board of the converter valve under test. The signal simulation unit is connected to the main control module and the multi-type interface adapter module respectively. It is used to generate and output at least one test excitation signal to the thyristor control unit board of the converter valve under test according to the test control command of the main control module. The test excitation signal includes electrical test signal and optical test signal. The data acquisition unit is connected to the multi-type interface adapter module and the main control module respectively. It is used to acquire the feedback signal output by the thyristor control unit board of the converter valve under test under the action of the test excitation signal, and transmit the feedback signal to the main control module. The communication and interaction module is connected to the main control module and is used to realize data interaction between the main control module and external devices and output test results.

[0007] Furthermore, the signal simulation unit includes a control signal simulation subunit and a return signal simulation subunit. The control signal simulation subunit is used to generate control signals for the converter valve control system, and the return signal simulation subunit is used to generate state simulation signals for the converter valve return loop.

[0008] Furthermore, the signal simulation unit also includes a high-frequency signal output subunit, which is used to apply a high-frequency electrical test signal with a preset frequency range to the thyristor control unit board of the converter valve under test. The preset frequency range is 1kHz-10MHz.

[0009] Furthermore, the data acquisition unit includes an analog acquisition subunit and a digital acquisition subunit. The analog acquisition subunit is used to acquire the voltage and current analog signals output by the board under test, and the digital acquisition subunit is used to acquire the status indication signals and communication protocol signals of the board under test.

[0010] Furthermore, the multi-type interface adapter module includes an optical interface unit and an electrical interface unit; wherein, the optical interface unit is used to interface with the optical fiber communication port of the thyristor control unit board of the converter valve under test; the electrical interface unit includes at least one of a DB9 interface and an RJ45 interface.

[0011] Furthermore, it also includes a power adapter module, which is connected to the main control module and is used to provide an adjustable output voltage DC power supply to the thyristor control unit board of the converter valve under test.

[0012] A testing method for a converter valve thyristor control unit board, based on the aforementioned converter valve thyristor control unit board testing system, includes: The mechanical and electrical connections between the test system and the thyristor control unit board of the converter valve under test are established through a multi-type interface adapter module, and the model and manufacturer information of the thyristor control unit board of the converter valve under test are identified through the main control module. The main control module sends a test excitation configuration command to the signal simulation unit based on the model and manufacturer information of the thyristor control unit board of the converter valve under test; the configuration command includes the test signal type, amplitude, and output timing. The signal simulation unit generates the corresponding test excitation signal according to the configuration command, and transmits it to the thyristor control unit board of the converter valve under test through the multi-type interface adapter module. The data acquisition unit synchronously acquires the feedback signal output by the control unit board of the converter valve under test after responding to the test excitation signal, and converts the feedback signal into a digital signal and transmits it to the main control module. The main control module analyzes and processes the feedback signal, compares it with the preset standard threshold, determines whether the function of the thyristor control unit board of the converter valve under test is normal, and outputs the test results through the communication interaction module.

[0013] Furthermore, when the thyristor control unit board of the converter valve under test is an ABB type thyristor control unit, the test excitation signal includes an AC power frequency voltage signal and an optical pulse trigger signal, and the amplitude range of the AC power frequency voltage signal is 0-10kV; When the thyristor control unit board of the converter valve under test is a Siemens type thyristor control unit, the test excitation signal includes the control system CLC interface signal and the return loop VBE-LR interface signal.

[0014] Furthermore, the main control module analyzes and processes the feedback signal, including: The main control module performs amplitude error analysis, response time analysis, and waveform distortion rate analysis on the feedback signal. When any analysis result exceeds the preset standard threshold, it is determined that the thyristor control unit board of the converter valve under test has a functional abnormality.

[0015] Furthermore, before establishing the mechanical and electrical connection between the test system and the thyristor control unit board of the converter valve under test through the multi-type interface adapter module, a calibration step is also included, the specific steps of which are as follows: The test system is connected via a standard calibration board. The main control module outputs a standard test signal and compares the data acquisition results of the data acquisition unit with the theoretical output value of the standard calibration board to complete the error calibration of the test system.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a testing system for a converter valve thyristor control unit board. The main control module parses test requirements and generates control commands, which are then connected to the board under test via multi-type interface adapter modules. An electrical and optical test excitation signal is output by a signal simulation unit, and feedback signals are captured and transmitted back to the main control unit by a data acquisition unit. A communication interaction module enables external data synchronization and result output. This system constructs a fully closed-loop testing architecture: the main control module coordinates all units, the interface adapter modules are compatible with various communication protocols, the signal simulation unit accurately generates excitation signals instead of traditional manual voltage regulation equipment, the data acquisition unit automatically acquires response data, and the communication module enables full-process data interaction. This testing system significantly optimizes space usage and eliminates the need for multi-device collaboration; fully automatic signal control replaces manual voltage regulation, reducing safety risks; a flexible and programmable excitation signal generation and acquisition mechanism supports rapid parameter adaptation; automated data acquisition and processing eliminates human error, reducing manpower; and the highly integrated system architecture enables automated testing and report generation throughout the entire process, significantly improving testing efficiency and reliability. It systematically solves the pain points of traditional testing technologies, such as large size, dangerous operation, low efficiency, and insufficient automation.

[0017] Preferably, in this invention, by adding a control signal simulation subunit and a return signal simulation subunit, the control signals of the valve control system and the status signals of the return loop are accurately generated respectively. This structure can simulate the bidirectional signal interaction scenario in the actual operation of the converter valve, and complete the full-function verification of the board without relying on external valve body equipment, which greatly improves the authenticity and coverage of the test scenario, while reducing the reliance on additional test equipment, and further enhances the system integration and test reliability.

[0018] Preferably, in this invention, the introduction of the high-frequency signal output subunit enables the system to output wide-frequency electrical test signals, covering the high-frequency response characteristic test requirements of the board under test; this design breaks through the frequency limitation of the traditional board resistor current limiting method, realizes accurate excitation under high-frequency operating conditions, provides complete test conditions for evaluating the dynamic performance of the board, and significantly enhances the system's adaptability to complex application scenarios.

[0019] Preferably, in this invention, analog and digital acquisition sub-units are used to process feedback signals separately, which can simultaneously capture continuous variables such as voltage and current, as well as discrete signals such as status indicators and communication protocols. This mechanism can ensure the complete acquisition of various response data, avoid the information loss caused by traditional single acquisition methods, provide multi-dimensional data support for the comprehensive analysis of the board's functions, and greatly improve the comprehensiveness and accuracy of test results.

[0020] Preferably, in this invention, the integrated design of the optical interface unit and multiple types of electrical interface units enables the system to be directly adapted to the fiber optic or electrical communication ports of different manufacturers' boards; this structure eliminates the need for adapters in traditional testing, realizes plug-and-play connection, effectively solves the problem of test interruption caused by interface incompatibility, and significantly improves testing convenience and equipment compatibility.

[0021] Preferably, in this invention, the power adapter module can provide adjustable DC power output capability and can dynamically adjust the power supply parameters according to test requirements; this design replaces the combination of manual voltage regulator and transformer, eliminates the safety hazards of manual power adjustment, and ensures accurate matching of the working voltage of the board under test, creating a stable and reliable power supply environment for testing.

[0022] This invention also provides a testing method for a converter valve thyristor voltage detection board. Based on the aforementioned testing system for the converter valve thyristor control unit board, this method first automatically establishes the physical and electrical connections of the board under test through a multi-type interface adaptation module. The main control module intelligently identifies the board model and manufacturer information, and generates an excitation configuration command containing signal type, amplitude, and timing, which is then sent to the signal simulation unit. The signal simulation unit accurately generates electrical and optical test excitation signals and inputs them to the board under test through the interface module, simultaneously triggering the data acquisition unit to capture the board's response signal in real time and transmit it digitally. The main control module compares the feedback signal with a preset threshold to analyze the functional status, and finally outputs the interpretation result through the communication module. This method constructs a fully closed-loop intelligent test chain of "identification-configuration-excitation-acquisition-analysis": test parameters are automatically adapted based on the board's identity, eliminating the manual selection and configuration step; a programmable signal generation mechanism replaces the traditional manual operation of voltage regulators and transformers; a synchronously triggered acquisition system ensures data timeliness; and an intelligent threshold comparison algorithm achieves automated functional diagnosis. This method significantly reduces equipment space requirements, enabling full-process testing of a single system; eliminates safety hazards associated with manual voltage adjustment and power supply operation; supports rapid matching of optimal test parameters through dynamic parameter configuration; eliminates human error through fully automated data acquisition and analysis; and achieves full automation from test initiation to report generation through an integrated process, systematically solving the problems of cumbersome operation, high safety risks, slow parameter adaptation, poor data reliability, and fragmented processes in traditional testing.

[0023] Preferably, in this invention, multi-dimensional analysis of amplitude error, response time, and waveform distortion rate is automatically performed and compared with thresholds, replacing the subjective evaluation of oscilloscope waveforms by manual interpretation. This intelligent diagnostic mechanism can eliminate human judgment bias, achieve objective quantitative determination of board function abnormalities, and significantly improve the accuracy and reliability of test results.

[0024] Preferably, in this invention, the calibration step verifies the system accuracy using a standard board, ensuring the reliability of the test signal output and data acquisition benchmarks. This self-checking mechanism effectively suppresses long-term test deviations caused by equipment drift, ensuring the measurement accuracy of the test system throughout its entire lifecycle and improving the reliability of test data from the source. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a test system for a converter valve thyristor control unit board provided in an embodiment of the present invention; Figure 2 This is an implementation structural diagram of a test system for a converter valve thyristor control unit board provided in an embodiment of the present invention; Figure 3 This is a control principle diagram of a test system for a converter valve thyristor control unit board provided in an embodiment of the present invention. Detailed Implementation

[0026] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] This embodiment provides a testing system for a converter valve thyristor control unit board, namely a convenient, efficient, small-sized, highly automated and digitalized multi-functional integrated automated testing device suitable for thyristor control units. Using this testing system greatly improves testing efficiency, reduces human error in data interpretation and recording, and saves labor costs.

[0031] It should be noted that the performance test of the thyristor control unit includes the following 8 test items: First, 22V energy extraction voltage test; Second, 11V energy extraction voltage test; Third, optical signal reception test; Fourth, feedback pulse test; Fifth, negative voltage establishment test; Sixth, positive voltage establishment test; Seventh, trigger pulse test; Eighth, reverse recovery time test.

[0032] The comprehensive functional test of the thyristor control unit board includes: First, trigger test (FT); Second, protection trigger test (PF); Third, thyristor reverse recovery period low voltage protection trigger test (RPH); Fourth, thyristor reverse recovery period high voltage protection trigger test (RPL).

[0033] Therefore, to meet the above-mentioned test requirements, this embodiment provides a test system for a converter valve thyristor control unit board. It uses one independent thyristor stage instead of two engineering components, reducing the footprint; it uses a programmable high-voltage power supply instead of a manual voltage regulator and transformer, automatically raising and lowering the voltage and electrically controlling the power supply's switching, reducing operational difficulty and safety risks; it uses a programmable load resistor instead of a current-limiting plate resistor, facilitating resistance value switching and reasonable parameter matching; it uses a multi-channel oscilloscope and measurement probe combined with a cable fixture to directly connect to the TCU board's measurement port, or uses a data acquisition module system combined with a cable fixture to directly connect to the TCU board's measurement port. The host computer and integrated software analyze, record, and generate reports from the acquired data; it uses a customized ZX-3 to serialize and complete the four tests: FT, PF, RPL, and RPH, and transmits the test results to the host computer to produce a test report. All equipment is installed in a test cabinet. It is operated and data recorded using a host computer to generate reports. The test cabinet has pre-installed test chambers and test cables; simply connect the TCU board to operate the test via the host computer. Once the TCU board is connected, the host computer's integrated software can analyze, record, and generate reports from the collected data.

[0034] like Figure 1As shown, this embodiment provides a test system for a converter valve thyristor control unit board, including: a main control module, used to parse test requirements and generate test control commands based on the parsing results; a multi-type interface adapter module, connected to the main control module, used to establish communication between the main control module and the converter valve thyristor control unit board under test; a signal simulation unit, connected to the main control module and the multi-type interface adapter module respectively, used to generate and output at least one test excitation signal to the converter valve thyristor control unit board under test according to the test control commands of the main control module; wherein, the test excitation signal includes electrical test signals and optical test signals; a data acquisition unit, connected to the multi-type interface adapter module and the main control module respectively, used to acquire the feedback signal output by the converter valve thyristor control unit board under test under the action of the test excitation signal, and transmit the feedback signal to the main control module; and a communication interaction module, connected to the main control module, used to realize data interaction between the main control module and external devices and output test results.

[0035] The testing system provided in this embodiment will be further described below with reference to the accompanying drawings: like Figure 2 As shown, this embodiment provides a test system for converter valve thyristor control unit boards, which can be applied to routine tests of thyristor control units in different ultra-high voltage DC transmission thyristor converter valve projects. It has a high degree of automation and digitization, is safe and reliable, and provides accurate data. It can efficiently complete the functional tests of various converter valve thyristor control unit boards (hereinafter referred to as the boards under test).

[0036] Combination Figure 3 As shown, this test system includes a main control module, a multi-type interface adapter module, a signal simulation unit, a data acquisition unit, a communication interaction module, and a power adapter module. The main control module, as the core control part of the entire test system, is implemented using an industrial control computer. It can receive and parse external input test requirements, generate corresponding test control commands based on the parsing results, and complete the setting of test parameters and test criteria, the selection of test items, and the subsequent storage of test data and generation of test reports.

[0037] The core control functions of the main control module are jointly implemented by the DSP and FPGA. The DSP is mainly responsible for communication and interaction with external devices, parsing test control commands, self-verification of communication data, and sending back the hardware status of the underlying control system. After decomposing the control commands, the DSP will send the specific control data to the FPGA. The FPGA has strict timing synchronization control capabilities. It can sample the external mains synchronization signal as the reference beat for timing control, and can also trigger the relevant channels of the data acquisition unit and control the power control component to load the corresponding excitation source to the thyristors connected to the board under test.

[0038] For example, the multi-type interface adapter module is connected to the main control module to establish a stable communication link between the main control module and the board under test. The multi-type interface adapter module includes an optical interface unit and an electrical interface unit. The optical interface unit can be directly connected to the optical fiber communication port of the board under test to realize reliable transmission of optical signals. The electrical interface unit includes at least one of DB9 interface and RJ45 interface to adapt to different electrical signal communication requirements of the board under test. At the same time, all interface signals of the multi-type interface adapter module are isolated through isolation power supply and optocoupler to effectively ensure the safety and reliability of the communication process.

[0039] For example, the signal simulation unit is connected to both the main control module and the multi-type interface adapter module. Based on the test control commands issued by the main control module, it can generate and output at least one test excitation signal containing both electrical and optical test signals to the board under test (DUT). Specifically, the signal simulation unit includes a control signal simulation subunit, a feedback signal simulation subunit, and a high-frequency signal output subunit. The control signal simulation subunit generates control signals for the converter valve control system, the feedback signal simulation subunit generates state simulation signals for the converter valve feedback loop, and the high-frequency signal output subunit applies a high-frequency electrical test signal with a preset frequency range of 1kHz-10MHz to the DUT. The excitation source for the signal simulation unit consists of a high-voltage pulse power supply and a medium-voltage power supply. The system uses two 2000W power frequency transformers to ensure both 800V and 500V power frequency inputs. The system applies excitation to the thyristor anode, and the test board obtains the excitation voltage through the excitation source. The specific implementation is as follows: First, the peak-to-peak voltage of the power frequency medium voltage is 2000V, which can meet the excitation requirements of the highest power frequency voltage of 1500V. Based on the influence of the voltage divider resistor in the actual test platform, it can ensure that the thyristor anode voltage is between 220V and 1500V, the reliable conduction current of the thyristor is between 2A and 5A, the maintenance current is about 0.5A, and the forward build-up voltage is about 120V. The actual transformer power of 2000W can ensure that the thyristor can conduct after the power frequency excitation is applied.

[0040] Secondly, the high-voltage DC power supply provides high-voltage DC excitation. Specifically, there are three types of excitation sources. One is a pulse power supply with a high voltage of 8000V or above. There are no requirements for the voltage rise time. As long as the load power can ensure that the thyristor anode voltage reaches 8000V, it is sufficient. According to the characteristics of the thyristor anode load resistance, a 10KV high-voltage DC power supply with an average power of 500W can meet the requirements. The output voltage of the high-voltage power supply can be set through the control system. The output voltage is adjustable from 0 to 12000V, and the maximum average output current is 50mA.

[0041] The third and second excitation sources are pulsed DC high voltage sources with required rise time slopes, ranging from 10V / uS to 100V / uS, which can be programmed.

[0042] Fourth, the third type of excitation source is a pulsed high-voltage power supply with a peak output power of around 2000V. It has a shorter rise time and needs to be loaded simultaneously with the mains frequency power supply. Therefore, it requires a higher output power to achieve the purpose of voltage reversal. The peak current is 5A and the average power is 1000W to meet the loading requirements of the reverse recovery period test.

[0043] Fifth, the high-voltage DC power supply and the medium-voltage power supply at the power frequency are the test load excitation sources. The voltage is relatively high. In order to prevent system overshoot and excessive interference, the switching between high-voltage excitation sources adopts reed relays and current-limiting protection resistors. The output switching signal should not be switched during high voltage periods as much as possible. A sampling judgment circuit is used to switch at the low voltage point. The principle is to switch at zero voltage point and switch before applying voltage to ensure the life of high-voltage switching devices, reduce electromagnetic interference, and improve system reliability.

[0044] Sixth, the high-voltage source uses 220V power supply. The 220V voltage is rectified to generate 300V DC, which is then chopped into a high-frequency square wave. This wave is then boosted once by a high-frequency transformer, followed by a second boost through a voltage doubler rectifier circuit. The output high voltage is filtered and then passed through a feedback-controlled chopper circuit to control the pulse width, thus outputting a stable DC high voltage. Controlling the pulse width adjustment rate of the DC high voltage can control the overshoot voltage, achieving appropriate overshoot control and thus better voltage control. The slope generation circuit is a pulse circuit design based on the DC high voltage, combined with a filter circuit and a current limiting circuit. Within a certain load range, it controls the voltage rise slope, thus obtaining the slope generation circuit.

[0045] Seventh, by maintaining an appropriate safety distance, using pressure-resistant and highly insulating materials, and employing devices such as fiber optic sensors and isolation transformers to separate high and low voltage control, isolation and insulation between low-voltage signals, low-voltage power frequencies, and high voltage are ensured. For example, the data acquisition unit connects to multiple interface adapter modules and the main control module to acquire the feedback signals output by the board under test (DUT) under the test excitation signal and transmit them to the main control module. The data acquisition unit includes analog acquisition subunits and digital acquisition subunits. The analog acquisition subunit uses a multi-channel oscilloscope equipped with a high-voltage probe to accurately acquire the voltage and current analog signals output by the DUT, especially the current signal during the thyristor's opening process. By analyzing the voltage and current waveforms, the operation of the thyristor and the effectiveness of the protection function can be determined. The digital acquisition subunit is used to acquire the status indication signals and communication protocol signals of the DUT. The FPGA, combined with high-speed electromagnetic isolation devices, ensures high control accuracy in time measurement, thereby ensuring the accuracy of data acquisition.

[0046] For example, the communication interaction module is connected to the main control module to realize data interaction and test result output between the main control module and external devices. The main control module receives external input test requirements through this module, and transmits the data during the test process and the final test results to the outside, and works with the main control module to complete the generation and output of the test report.

[0047] As another optimization in this embodiment, the power adapter module is connected to the main control module and can provide the board under test with an adjustable DC power supply, ensuring that the board under test has a stable and required power supply during the test.

[0048] As another optimization in this embodiment, the test system is also equipped with a TCU board fixture. The TCU board fixture is designed as an operating box, used to fix the board under test, thyristors, and test capacitors. It also allows for quick connection and disconnection of test leads. The interface signals of the fixture are uniformly received by the control box, processed separately for high and low voltage, and then uniformly sent to the switch array in the control box. The TCU board fixture can simultaneously hold multiple boards for sequential testing. This assembly-line board installation method reduces installation time for test personnel and effectively improves testing efficiency. Given the fixture's fragility, its separate placement design makes subsequent maintenance and upgrades more convenient. Furthermore, multiple sets of relays used to test a large number of boards significantly extend the overall service life of the fixture, reduce maintenance costs, and improve test reliability. More importantly, in the test mode where the fixture is separated from the cabinet, test personnel must operate the power-off protection button on the fixture before opening the fixture cover. This design allows operators to stay away from high-voltage sources, greatly improving test safety.

[0049] Based on the above testing system, this embodiment also provides a testing method for the converter valve thyristor control unit board. Before conducting the formal test, a calibration step must be performed first. Specifically, the test system is connected through a standard calibration board, the main control module outputs a standard test signal, and the acquisition results of the data acquisition unit are compared with the theoretical output value of the standard calibration board to complete the error calibration of the test system.

[0050] After calibration, the mechanical and electrical connections between the test system and the board under test are established through multi-type interface adapter modules and TCU board tooling. The main control module identifies the model and manufacturer information of the board under test through communication with it.

[0051] Subsequently, the main control module sends a test excitation configuration command containing the test signal type, amplitude, and output timing to the signal simulation unit based on the model and manufacturer information of the board under test.

[0052] When the board under test is an ABB thyristor control unit, the test excitation signal includes AC power frequency voltage signal and optical pulse trigger signal; When the board under test is a Siemens type thyristor control unit, the test excitation signals include the control system CLC interface signal and the return loop VBE-LR interface signal.

[0053] The signal simulation unit generates corresponding test excitation signals according to the configuration instructions and transmits them to the board under test through a multi-type interface adapter module. The FPGA can send drive control signals to the board at the zero crossing point or voltage peak according to the mains synchronization signal. It can also send sequential clock pulses to the board to control the board to different working states.

[0054] The data acquisition unit synchronously acquires the feedback signal output by the board under test after responding to the test excitation signal, converts the feedback signal into a digital signal, and transmits it to the main control module.

[0055] The main control module analyzes and processes the feedback signal, including amplitude error analysis, response time analysis, and waveform distortion rate analysis. It compares the results of each analysis with preset standard thresholds. When any analysis result exceeds the preset standard threshold, it is determined that the board under test has a functional abnormality. Finally, the test results are output through the communication interaction module.

[0056] Therefore, this testing system and method can be applied to the routine testing and verification of thyristor control units in multiple ultra-high voltage DC transmission thyristor converter valve projects.

[0057] In summary, the testing system and method for a converter valve thyristor control unit board provided by this invention have the following advantages compared to existing testing methods: Firstly, initially, there were no testing methods for thyristor control units. Testing was only conducted as a whole during routine tests of converter valve assemblies, which could not guarantee the functionality of the thyristor control unit. Later, ordinary probes were used to test the thyristor control unit devices at numerous points, resulting in low testing efficiency and damage to the protective paint on the thyristor control unit. Further, intelligent testing fixtures for thyristor control units were adopted, but data still required manual observation and recording, compromising accuracy and precision. Furthermore, four people were needed in two groups to complete the low-voltage and high-voltage tests separately, consuming significant manpower. This invention uses a multi-functional integrated automated testing device for thyristor control units, requiring only one operator. After installing the thyristor control unit in the test chamber, the operator selects all test items on the host computer of the main control unit. The testing device automatically completes all tests sequentially, collects and extracts data, generates and saves test reports, greatly improving testing efficiency and accuracy, reducing errors caused by human error, saving labor costs, and enhancing automated and digital testing capabilities.

[0058] Secondly, this invention can be adapted to the testing of thyristor control units across multiple series and versions through parameter and criterion modifications. In the future, it will be applied to the routine testing and verification of approximately 3000 thyristor control units in several ultra-high voltage direct current (UHVDC) transmission thyristor converter valve projects, including the Chilean project. It boasts a high degree of automation and digitization, is safe and reliable, convenient and efficient, and provides accurate data, making it suitable for routine testing of thyristor control units in various UHVDC transmission thyristor converter valve projects.

[0059] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A test system for thyristor control unit boards of a converter valve, characterized in that Comprise: The main control module is used for analyzing test requirements and generating test control instructions according to the analysis results; The multi-type interface adaptation module is connected with the main control module and is used for establishing communication between the main control module and the thyristor control unit board of the converter valve to be tested; The signal simulation unit is connected with the main control module and the multi-type interface adaptation module respectively, and is used for generating and outputting at least one test excitation signal to the thyristor control unit board of the converter valve to be tested according to the test control instructions of the main control module; wherein the test excitation signal comprises an electrical test signal and an optical test signal; The data acquisition unit is connected with the multi-type interface adaptation module and the main control module respectively, and is used for acquiring the feedback signal output by the thyristor control unit board of the converter valve to be tested under the action of the test excitation signal, and transmitting the feedback signal to the main control module; The communication interaction module is connected with the main control module and is used for realizing data interaction and test result output between the main control module and external equipment.

2. A test system for a thyristor control unit board of a thyristor valve according to claim 1, characterized in that, The signal simulation unit comprises a control signal simulation subunit and a back-check signal simulation subunit, the control signal simulation subunit is used for generating a control signal of the converter valve control system, and the back-check signal simulation subunit is used for generating a state simulation signal of a back-check loop of the converter valve.

3. A test system for a thyristor control unit board of a thyristor valve according to claim 2, characterized in that, The signal simulation unit further comprises a high-frequency signal output subunit, the high-frequency signal output subunit is used for applying a high-frequency electrical test signal of a preset frequency range to the thyristor control unit board of the converter valve to be tested, and the preset frequency range is 1 kHz-10 MHz.

4. The test system of a thyristor control unit board card of a converter valve according to claim 1, characterized in that, The data acquisition unit comprises an analog quantity acquisition subunit and a digital quantity acquisition subunit, the analog quantity acquisition subunit is used for acquiring a voltage and a current analog signal output by the board to be tested, and the digital quantity acquisition subunit is used for acquiring a state indication signal and a communication protocol signal of the board to be tested.

5. The test system of a thyristor control unit board card of a converter valve according to claim 1, characterized in that, The multi-type interface adaptation module comprises an optical interface unit and an electrical interface unit; wherein the optical interface unit is used for docking with a fiber communication port of the thyristor control unit board of the converter valve to be tested; and the electrical interface unit comprises at least one of a DB9 interface and an RJ45 interface.

6. The test system of a thyristor control unit board card of a converter valve according to claim 1, characterized in that, Further comprising a power supply adaptation module, the power supply adaptation module is connected with the main control module and is used for providing a direct-current power supply with adjustable output voltage for the thyristor control unit board of the converter valve to be tested.

7. A method of testing a thyristor control unit board of a converter valve, based on the testing system of any one of claims 1-6, characterized in that, Comprise: The mechanical and electrical connection between the test system and the thyristor control unit board of the converter valve to be tested is established through the multi-type interface adaptation module, and the model and manufacturer information of the thyristor control unit board of the converter valve to be tested is recognized through the main control module; The main control module issues a test excitation configuration instruction to the signal simulation unit according to the model and manufacturer information of the thyristor control unit board of the converter valve to be tested; the configuration instruction comprises a test signal type, an amplitude and an output timing; The signal simulation unit generates a corresponding test excitation signal according to the configuration instruction, and transmits the test excitation signal to the thyristor control unit board of the converter valve to be tested through the multi-type interface adaptation module; The data acquisition unit synchronously acquires the feedback signal output by the thyristor control unit board of the converter valve to be tested in response to the test excitation signal, and converts the feedback signal into a digital signal and transmits the digital signal to the main control module; The main control module analyzes and processes the feedback signal, compares with the preset standard threshold, judges whether the function of the thyristor control unit card of the to-be-tested converter valve is normal, and outputs the test result through the communication interaction module.

8. A method of testing a thyristor control unit board of a thyristor valve according to claim 7, characterized in that, When the to-be-tested thyristor control unit card is an ABB type thyristor control unit, the test excitation signal includes an alternating current power frequency voltage signal and an optical pulse trigger signal, and the amplitude range of the alternating current power frequency voltage signal is 0-10kV; When the to-be-tested thyristor control unit card is a Siemens type thyristor control unit, the test excitation signal includes a control system CLC interface signal and a back-check loop VBE-LR interface signal.

9. The method of claim 7, wherein the test method is a test method for a thyristor control unit board card of a thyristor valve, and The main control module analyzes and processes the feedback signal, including: The main control module analyzes and processes the feedback signal, including:

10. The method of claim 7, wherein the test method is a test method for a thyristor control unit board card of a thyristor valve, and The main control module analyzes and processes the feedback signal, including: Before the mechanical and electrical connection between the test system and the to-be-tested thyristor control unit card of the converter valve is established through the multi-type interface adaptation module, a calibration step is further included, and the specific steps are as follows: The test system is connected through a standard calibration card, the main control module outputs a standard test signal, and the acquisition result of the data acquisition unit is compared with the theoretical output value of the standard calibration card to complete the error calibration of the test system.

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