Test methods applicable to LCC converter valves and CLCC converter valves

Abstract

The present invention relates to a test method suitable for LCC converter valves and CLCC converter valves, which is intended to meet the test requirements of thyristor valves and IGBT submodules. The method includes selecting test items and modes through a human-computer interaction module, a main control unit controlling an output power module, real-time monitoring of voltage and current parameters, and using an adaptive test algorithm for parameter matching, dynamic adjustment, and abnormality detection. The algorithm dynamically adjusts the power output according to changes in test conditions, minimizes the difference between the system output and the reference value, and ensures data accuracy and security through noise filtering and equipment monitoring. The present invention is compatible with a variety of power supply types, has high test accuracy, and is highly adaptable.

Description

Technical Field

[0001] The present invention relates to the field of power systems, and in particular to a testing method applicable to an LCC converter valve and a CLCC converter valve. Background Art

[0002] In modern power systems, converter valves are one of the core components of high-voltage direct current (HVDC) technology. HVDC technology has significant advantages in long-distance, high-power power transmission, which can reduce power loss, improve transmission efficiency, and enable interconnection of power grids of different frequencies. As a key device for converting direct current into alternating current, converter valves are widely used in various types of power transmission and distributed energy systems. The reliability of their performance is crucial to the safe and stable operation of power systems.

[0003] The core components of the converter valve include thyristors and insulated gate bipolar transistors (IGBTs). Thyristor converter valves are the main components of traditional LCC (Line Commutated Converter) high-voltage direct current transmission systems, which rely on the commutation voltage provided by the power grid to achieve commutation. Thyristors have a simple structure, the ability to withstand high voltage and high current, and low cost, so they are widely used in long-distance, high-power transmission projects. However, thyristor converter valves are easily affected by overvoltage, overcurrent and other working conditions under dynamic conditions that require frequent commutation, and targeted testing and monitoring methods are required to ensure their stability under various working environments.

[0004] In recent years, with the development of power electronics technology, IGBT-based controlled commutation converter valves (CLCC) have gradually entered the field of high-voltage DC transmission. Compared with thyristors, IGBTs have self-shutdown capabilities and can achieve commutation without relying on external commutation voltage, which gives them significant advantages in control flexibility and dynamic response. CLCC converter valves are gradually becoming an important part of the new generation of transmission technology because they are more suitable for voltage source converter (VSC) high-voltage DC transmission systems. IGBT converter valves can support high-frequency switching operations, reduce harmonic generation, and reduce the impact on system power quality. In addition, the application of IGBTs in the grid connection of distributed energy and renewable energy (such as wind and solar energy) is also increasing. Therefore, the demand for testing IGBT submodules has also increased.

[0005] As the core equipment in the HVDC transmission system, the performance of the converter valve must be strictly tested and verified. Traditional converter valve testing methods often use independent test equipment to perform different types of tests, such as short-circuit tests, reverse recovery period tests, energy storage tests, etc. for thyristors, and electrical path tests, open-close tests, etc. for IGBTs. This traditional test mode requires frequent replacement of test equipment and reconnection of circuits, resulting in low test efficiency, more manual intervention, and easy errors. In addition, traditional test equipment is bulky and cannot meet the requirements of modern power systems for integrated, miniaturized, and flexible test equipment. Summary of the invention

[0006] In order to solve the above problems in the prior art, the present invention proposes a test method applicable to LCC converter valves and CLCC converter valves, characterized in that the test method comprises the following steps:

[0007] (a) Select test items and corresponding test modes according to test requirements through the human-computer interaction module of the main control unit;

[0008] (b) the main control unit controls the output control unit to provide appropriate power output to the converter valve to be tested from multiple shared power modules according to the test requirements;

[0009] (c) real-time monitoring of voltage and current parameters through sampling units;

[0010] (d) the main control unit dynamically adjusts the power output of the output control unit according to the voltage and current parameters monitored in real time by the sampling unit;

[0011] (e) The main control unit uses an adaptive test algorithm to compare the monitored parameters with the preset standards;

[0012] (f) Determine whether the converter valve under test passes the test based on the comparison result:

[0013] The test method is based on a test device that meets the test requirements of both the thyristor valve and the IGBT submodule.

[0014] The power supply types output by the power supply module include: 100V DC source, high-voltage DC source, high-voltage pulse source and current source.

[0015] The adaptive test algorithm includes a parameter matching method, which includes automatically loading a standard parameter set of the corresponding converter valve type, wherein the standard parameter set includes a voltage range, a current range, a frequency and a pulse width; the main control unit automatically retrieves and loads the corresponding standard parameter set according to the test item selected by the user for subsequent adjustment and comparison.

[0016] The adaptive test algorithm includes a dynamic adjustment method, which dynamically adjusts the comparison standard according to the change of the test conditions to minimize the difference between the system output and the target reference value; and is achieved by controlling the cost function of the target.

[0017] The calculation formula of the cost function J of the control objective is:

[0018]

[0019] in, is the output value of the system at the kth moment, is the preset target reference value, For control variables The amount of change, is the weight coefficient of the control action, is the length of the prediction time domain, To control the length of the time domain.

[0020] The adaptive test algorithm monitors the voltage and current of the converter valve in real time through a closed-loop feedback control strategy, calculates the error between the output value and the target reference value, adjusts the control variable according to the prediction model, and controls the output control unit to operate the power module.

[0021] The adaptive test algorithm includes an anomaly detection method, which processes the collected voltage and current signals through noise filtering and verifies whether the internal relationship between the voltage and current signals meets the preset standards; monitors the status of the sampling unit, sensor and data transmission link, and triggers the protection mechanism if a fault is found.

[0022] The multi-type converter valve testing method proposed in the present invention has significant beneficial effects. First, through the human-computer interaction module and the main control unit, the user can flexibly select the test items and modes of different types of converter valves, automatically adapt to the test requirements of the thyristor valve and IGBT sub-module, and greatly improve the test efficiency and operation convenience. Secondly, using the adaptive test algorithm, the system can dynamically adjust the power output, and monitor and adjust the voltage and current parameters in real time to ensure the optimal state of the test conditions and improve the test accuracy. In addition, the anomaly detection function ensures the accuracy of the data and the safety of the equipment through noise filtering and equipment status monitoring, and avoids misjudgment caused by external interference or equipment failure. The method also supports multiple power supply type outputs, is suitable for different test scenarios, has good compatibility and flexibility, and meets diverse testing needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application, but do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 The present invention is a system structure block diagram for testing an LCC converter valve and a CLCC converter valve.

[0025] Figure 2 Flow chart of the testing method of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, wherein the illustrative embodiments and descriptions are only used to explain the present invention but are not intended to limit the present invention.

[0027] Embodiment 1:

[0028] System structure and workflow:

[0029] The system structure is as follows:

[0030] See also Figure 1 The test system of the present invention mainly includes a main control unit, an output control unit, a plurality of shared power modules, a human-computer interaction module, a sampling unit, a display module and a storage module. Among them:

[0031] 1. Main control unit: responsible for the control and coordination of the entire test system, including the central processor and control logic, used to execute test processes and algorithms.

[0032] 2. Output control unit: It is composed of multiple switchable switches and adjustment devices. It receives instructions from the main control unit, selects and configures the optimal power module, and provides the required power output for the converter valve to be tested.

[0033] 3. Multiple shared power modules: Provide power outputs with different voltage and current specifications, allowing the test system to select the most suitable power module according to needs.

[0034] 4. Human-computer interaction module: includes a touch screen display and input devices, through which the user selects test items, test modes and views test results.

[0035] 5. Sampling unit: connected to the voltage and current detection points of the converter valve to be tested, collects voltage and current parameters in real time, and feeds the data back to the main control unit.

[0036] 6. Display module: used to display test results, alarm information and system status.

[0037] 7. Storage module: used to store test data, test results and related parameters for subsequent analysis and recording.

[0038] Test method flow:

[0039] See also Figure 2, the test method steps of the present invention are described in detail below:

[0040] Step (a): Select test items and test mode;

[0041] First, the user interacts with the main control unit through the human-computer interaction module. According to different test requirements, the user selects the corresponding test items on the touch screen, such as tests for thyristor valves or IGBT submodules. After receiving the user's selection, the main control unit determines the required test mode to ensure that the selected test mode can meet the specific test requirements of the selected converter valve type.

[0042] For example, for the test of thyristor valves, specific switching frequencies and voltage levels are required, while for the test of IGBT submodules, different pulse width modulation (PWM) signals and higher switching speeds are required. The main control unit automatically adjusts the test parameters according to the user's selection to adapt to the test requirements of different types of converter valves.

[0043] Step (b): Selecting the optimal power supply and providing appropriate power output;

[0044] The main control unit selects the best power module from multiple shared power modules by controlling the output control unit to meet the current test requirements. The selection criteria include the voltage, current output capacity, stability and response speed of the power module.

[0045] For example, when a high voltage output is required for an impact test, the main control unit selects a power module that can provide a higher voltage and is stable; when a continuous stability test is performed, a power module with a higher current output capacity is selected. After the power module is selected, the output control unit adjusts the power output parameters to ensure that the converter valve under test receives the appropriate power signal.

[0046] Step (c): real-time monitoring of voltage and current parameters;

[0047] During the test, the sampling unit continuously monitors the voltage and current parameters of the converter valve under test. The sampling unit captures instantaneous voltage and current changes through high-precision sensors and transmits the collected data to the main control unit in real time.

[0048] For example, when performing high-frequency switching tests, the sampling unit can capture instantaneous voltage spikes and current fluctuations, which are crucial for evaluating the switching performance and tolerance of the converter valve.

[0049] Step (d): dynamically adjusting the power supply output to optimize the test conditions;

[0050] The main control unit dynamically adjusts the power output of the output control unit according to the real-time voltage and current parameters provided by the sampling unit. This process adopts a closed-loop control strategy to ensure that the test conditions are always in the optimal state.

[0051] For example, if the current fluctuation is found to exceed the preset range during the test, the main control unit will immediately adjust the power supply output current to avoid damage to the converter valve under test while maintaining the accuracy and consistency of the test data.

[0052] Step (e): using an adaptive test algorithm to compare parameters;

[0053] The main control unit has a built-in adaptive test algorithm to compare the collected real-time voltage and current parameters with the preset standard parameters. The adaptive test algorithm can automatically adjust the comparison standards and thresholds according to the characteristics of different types of converter valves to improve the accuracy and adaptability of the test.

[0054] For example, for different models of IGBT submodules, the preset standard parameters are different. The adaptive test algorithm can identify the model of the converter valve to be tested and automatically apply the corresponding standard parameters for comparison.

[0055] Step (f): determining the test result according to the comparison result;

[0056] Based on the comparison results of the adaptive test algorithm, the main control unit determines whether the converter valve to be tested passes the test:

[0057] Test passed: If the collected parameters meet the preset standards, the main control unit displays the test passed information through the display module and stores the test data in the storage module for subsequent query and analysis.

[0058] Test failure: If the parameters do not meet the standards, the main control unit immediately stops the test, turns off the power output, and displays the test failure information through the display module. At the same time, it records the failure cause and related parameters so that the user can conduct further fault analysis and processing.

[0059] This embodiment achieves efficient and accurate testing of multiple types of converter valves through intelligent control and adaptive algorithms of the main control unit. The system can automatically select the optimal power module according to different test requirements, monitor and adjust the test conditions in real time, and ensure the stability of the test process and the reliability of the data. At the same time, the application of the storage module enables the test data to be stored for a long time, providing strong data support for quality control and research and development.

[0060] In addition, the human-computer interaction module of this system simplifies the operation process. Users only need to select test items and modes through a simple interface, and the system can automatically complete the subsequent complex test steps, greatly improving test efficiency and operational convenience.

[0061] In practical applications, the main control unit can use a high-performance embedded processor and run specially designed test software to achieve efficient data processing and control. The output control unit can use programmable logic devices (such as FPGA) to achieve fast response and precise adjustment. In addition, the sampling unit should be equipped with a high-precision ADC converter to ensure the accuracy and real-time nature of the collected data.

[0062] The system's power module should have overvoltage and overcurrent protection functions to ensure the safety of the test process. The human-computer interaction module should have a friendly user interface, support multiple languages ​​and multiple input methods, and meet the operating habits of different users.

[0063] In terms of software, the adaptive test algorithm should have self-learning and optimization capabilities, and be able to continuously adjust and optimize the test strategy based on historical test data to improve the accuracy and adaptability of the test. The storage format of the test data should be compatible with common data analysis software to facilitate users to conduct in-depth analysis and report generation.

[0064] This embodiment describes in detail a testing method suitable for LCC converter valves and CLCC converter valves. Through intelligent control, real-time monitoring and adaptive algorithms, an efficient, accurate and reliable testing process is achieved. The method is suitable for multiple fields such as research and development, production and quality control of power electronic equipment.

[0065] Embodiment 2:

[0066] Detailed description of the system structure:

[0067] See also Figure 1 The test system of the present invention mainly includes a main control unit, an output control unit, multiple shared power modules, a human-computer interaction module, a sampling unit, a display module and a storage module. The specific functions and relationships of each component are described as follows:

[0068] 1. Main control unit:

[0069] The main control unit is the core control part of the entire test system, responsible for the overall coordination and management of the system. It contains a high-performance central processing unit (CPU) and dedicated control logic circuits, which can efficiently execute complex test processes and algorithms. The main control unit exchanges data and transmits instructions with other modules through the internal communication bus to ensure that all parts work together. In addition, the main control unit also integrates a variety of communication interfaces (such as USB, Ethernet interface, etc.) to support connection and data interaction with external devices, enhancing the scalability and compatibility of the system.

[0070] 2. Output control unit:

[0071] The output control unit consists of multiple switchable electronic switches and precision adjustment devices, and is responsible for selecting and configuring the optimal power module according to the instructions of the main control unit. The unit can quickly switch between different power modules to ensure that the converter valve under test obtains stable and compliant power output during the test. The output control unit also has overvoltage and overcurrent protection functions, which can automatically disconnect the power output in abnormal situations to ensure the safety of the test equipment and the converter valve under test.

[0072] 3. Multiple shared power modules:

[0073] The power module includes multiple independent power units, each with different voltage and current output specifications to meet diverse test requirements. These power modules are connected to the output control unit through a shared power bus. The main control unit can select the most suitable power module for power supply according to the specific requirements of the test project. Each power module is equipped with a high-precision voltage regulator and filter to ensure the stability and purity of the output power and reduce the interference of power supply noise on the test results. For example, the output power types include:

[0074] 100V DC source: used to test low voltage DC equipment.

[0075] High voltage DC source: used to provide the high voltage required for testing.

[0076] High voltage pulse source: used to generate pulse signals to test the dynamic response of the equipment.

[0077] Current source: used to provide stable current and detect current response.

[0078] 4. Human-computer interaction module:

[0079] The human-computer interaction module includes a high-resolution touch screen display and multi-function input devices (such as keyboard, mouse, etc.), providing users with a friendly and intuitive operation interface. Through this module, users can easily select test items, set test parameters, select test modes, and view various data and final test results during the test in real time. The human-computer interaction module also supports multi-language interfaces to meet the usage habits and needs of different users. In addition, the module has a remote control function, allowing users to remotely operate the test system through a network interface, which improves the flexibility and convenience of the system.

[0080] 5. Sampling unit:

[0081] The sampling unit is connected to the key voltage and current detection points of the converter valve to be tested, and is responsible for real-time acquisition of the voltage and current parameters of the converter valve during the test. The unit uses high-precision sensors and high-speed analog-to-digital converters (ADCs) to ensure the accuracy and real-time nature of the collected data. The sampling unit converts the collected analog signals into digital signals through high-speed data transmission interfaces (such as SPI, I2C, etc.), and transmits them to the main control unit in real time for processing and analysis. The sampling unit also has data buffering and preprocessing functions, which can filter and reduce noise on the raw data to improve the reliability of subsequent data analysis.

[0082] 6. Display module:

[0083] The display module is used to intuitively display various information during the test process, including real-time voltage and current curves, test progress, alarm information, and final test results. The module displays data through a graphical interface to help users quickly understand the test status and results. The display module also supports data visualization functions such as trend charts, bar charts, and pie charts, which facilitate users to conduct in-depth analysis and comparison of test data. In addition, the display module can work with the main control unit to update the display content in real time to ensure the timeliness and accuracy of information.

[0084] 7. Storage module:

[0085] The storage module is used to store various data and results generated during the test for a long time, including voltage, current parameters, test logs, user-set test configurations, and final test reports. The module uses high-speed storage media (such as SSD or high-capacity HDD) to ensure fast data reading and writing and high reliability. The storage module is connected to the main control unit through an internal data bus to support the storage and efficient management of large-capacity data. Users can access and manage the data stored in the storage module through the human-computer interaction module, which supports data export, backup, and recovery functions to facilitate subsequent data analysis and record keeping.

[0086] The above modules are interconnected through the internal data bus and control bus to ensure the efficient transmission of information and instructions. As the core of the system, the main control unit receives the test requirements and parameter instructions input by the user through the human-computer interaction module, and then selects and configures the appropriate power module through the output control unit to provide the required power output for the converter valve to be tested. During the test, the sampling unit collects voltage and current data in real time and transmits the data to the main control unit. The main control unit processes and analyzes the data according to the preset test algorithm, and dynamically adjusts the power output to optimize the test conditions. At the same time, the display module displays the key parameters and status information of the test process in real time, and the user can monitor the test progress and results in real time through the human-computer interaction module. All test data and results are stored in the storage module for subsequent query, analysis and recording.

[0087] Through modular design, the system structure realizes efficient coordination and flexible configuration of various components, and can adapt to the testing requirements of various types of converter valves. The main control unit integrates powerful processing capabilities and intelligent control algorithms to ensure the accuracy and efficiency of the test process. The output control unit and multiple shared power modules provide a diversified and stable power supply to meet the needs of different test scenarios. The sampling unit and display module ensure real-time monitoring and intuitive display of data, and improve the controllability and transparency of the test. The storage module provides reliable guarantee for the long-term storage and subsequent analysis of test data. The overall system structure is simple and reasonable, with high scalability and reliability, and is suitable for multiple fields such as research and development, production and quality control of power electronic equipment.

[0088] In summary, this system structure achieves comprehensive, accurate and reliable testing of multiple types of converter valves through sophisticated module design and efficient collaborative work, significantly improves test efficiency and data quality, and has broad application prospects and significant technical advantages.

[0089] Embodiment 3:

[0090] Specific test steps:

[0091] Step (a): Select the test item and mode through the main control unit;

[0092] First, the user interacts with the main control unit through the human-computer interaction module. The human-computer interaction module includes a high-resolution touch screen display and multi-function input devices (such as keyboard, mouse, etc.), providing a user-friendly operation interface. According to different test requirements, the user browses and selects the corresponding test items on the touch screen, such as test items for thyristor valves or IGBT submodules. Each test item corresponds to a specific test mode. After receiving the user's selection, the main control unit automatically identifies the type of the selected converter valve and determines the corresponding test mode.

[0093] For example, for the test of thyristor valves, it is necessary to set a specific switching frequency (such as 50Hz or 60Hz) and voltage level (such as 500V or 1000V) to simulate the performance in the actual working environment; while for the test of IGBT submodules, it is necessary to configure different pulse width modulation (PWM) signals, higher switching speeds (such as tens of kHz) and higher current carrying capacity. The main control unit automatically adjusts the test parameters according to the user's selection to ensure that the selected test mode can accurately match the characteristics and test requirements of the converter valve to be tested.

[0094] In addition, the main control unit can also recommend the most suitable test items and modes based on historical test data and preset test templates, further simplifying the user's operation process and improving the accuracy and efficiency of the test. After the user confirms the selection, the system will enter the next test step and prepare for power configuration and parameter setting.

[0095] Step (b): Selecting the optimal power supply and providing appropriate power output;

[0096] After determining the test items and modes, the main control unit selects the best power module from multiple shared power modules by controlling the output control unit to meet the current test requirements. The criteria for selecting the power module mainly include the voltage output range, current output capacity, output stability and response speed of the power module.

[0097] For example, when a high-voltage pulse impact test is required, the main control unit will give priority to power modules that can provide up to 1000V and have fast response capabilities; when a long-term continuous stability test is performed, a power module with a higher current output capacity (such as more than 100A) and better stability is selected. The main control unit selects and switches the power module by sending a control signal to the output control unit.

[0098] After selecting the power module, the output control unit further adjusts the output parameters of the power supply, including voltage, current and waveform characteristics, to ensure that the converter valve to be tested (hereinafter referred to as the "converter valve") receives a power signal that meets the test requirements. The output control unit also has overvoltage, overcurrent and short-circuit protection functions. When an abnormal situation is detected, it can immediately cut off the power output to ensure the safety of the test equipment and the converter valve.

[0099] Step (c): real-time monitoring of voltage and current parameters;

[0100] During the test, the sampling unit continuously monitors the voltage and current parameters of the converter valve. The sampling unit is connected to the key nodes of the converter valve and uses high-precision voltage sensors and current sensors to collect the voltage and current changes of the converter valve during the test in real time. The analog signal collected by the sensor is converted into a digital signal through a high-speed analog-to-digital converter (ADC) and transmitted to the main control unit in real time for processing and analysis.

[0101] For example, when conducting high-frequency switching tests, the sampling unit can capture the voltage spikes and current fluctuations generated by the converter valve at the moment of switching, which are essential for evaluating the switching performance, thermal characteristics and tolerance of the converter valve. The sampling unit also has data buffering and preprocessing functions, which can filter, reduce noise and conduct preliminary analysis on the raw data to improve the accuracy and reliability of the data.

[0102] In addition, the sampling unit supports multi-channel synchronous sampling, which can simultaneously monitor the voltage and current of multiple key points of the converter valve, and fully reflect the working status of the converter valve. The sampling data is transmitted to the main control unit at high speed through the internal data bus, ensuring that the main control unit can obtain the latest test parameters in time, and realize real-time monitoring and dynamic adjustment.

[0103] Step (d): dynamically adjusting the power supply output to optimize the test conditions;

[0104] The main control unit dynamically adjusts the power output of the output control unit according to the real-time voltage and current parameters provided by the sampling unit. This process adopts a closed-loop control strategy to ensure that the test conditions are always in the optimal state. The specific operations are as follows:

[0105] When the voltage or current parameters detected by the sampling unit deviate from the preset range, the main control unit immediately calculates the required adjustment range and sends the corresponding adjustment command to the output control unit. After receiving the command, the output control unit adjusts the output voltage or current of the power module to achieve precise control of the test conditions.

[0106] For example, during a pulse test, if the current peak is detected to exceed the preset safety threshold, the main control unit will instruct the output control unit to reduce the output current of the power module to prevent the converter valve from being damaged due to overcurrent. At the same time, the main control unit will also record the specific parameters of this adjustment as a basis for subsequent analysis and optimization of the test strategy.

[0107] In addition, the main control unit can also optimize the test waveform and parameter settings based on real-time monitoring data to improve the accuracy and efficiency of the test. For example, the switching frequency and pulse width are gradually adjusted during the test to determine the optimal operating point of the converter valve and comprehensively evaluate its performance and reliability.

[0108] Step (e): using an adaptive test algorithm to perform parameter comparison;

[0109] The main control unit has a built-in adaptive test algorithm that compares the collected real-time voltage and current parameters with the preset standard parameters. The adaptive test algorithm can automatically adjust the comparison standard and threshold according to the characteristics of different types of converter valves to improve the accuracy and adaptability of the test.

[0110] Specifically, the adaptive testing algorithm includes the following steps:

[0111] 1. Parameter matching: Based on the test items and modes selected by the user in step (a), the adaptive test algorithm first determines the corresponding standard parameter set. These standard parameters include voltage, current, frequency, pulse width, etc., and different reference values ​​and tolerance ranges are set for different models and types of converter valves.

[0112] 2. Dynamic adjustment: During the test, the algorithm dynamically adjusts the comparison criteria based on the data collected in real time.

[0113] 3. Anomaly detection: The adaptive test algorithm has anomaly detection function, which can identify and filter out abnormal data caused by noise, interference or equipment failure to ensure the accuracy of parameter comparison.

[0114] Step (f): determining the test result according to the comparison result;

[0115] According to the comparison results of the adaptive test algorithm, the main control unit determines whether the converter valve to be tested has passed the test and takes corresponding treatment measures:

[0116] 1. Test passed:

[0117] Judgment condition: If the collected voltage and current parameters are within the preset standard range, the main control unit determines that the converter valve has passed the test.

[0118] Processing steps:

[0119] The display module displays the "test passed" information in real time, and the user can view the test results intuitively on the touch screen.

[0120] The detailed test data (including various voltage and current parameters, test time, test conditions, etc.) are stored in the storage module to facilitate subsequent query, analysis and recording.

[0121] The system automatically generates a test report containing charts and data analysis results for user reference and archiving.

[0122] 2. Test failure:

[0123] Judgment conditions: If any of the collected parameters exceeds the preset standard range, the main control unit determines that the converter valve has failed the test.

[0124] Processing steps:

[0125] The main control unit immediately sends instructions to the output control unit to stop the power output to ensure the safety of the test process.

[0126] The display module displays the "test failure" information in real time and provides the specific reasons for failure (such as overvoltage, overcurrent, etc.).

[0127] The failed test data and related parameters are recorded in the storage module to facilitate the user to conduct further fault analysis and processing.

[0128] The system can automatically generate fault reports, including abnormal data and fault causes, to help users quickly locate problems.

[0129] In addition, the main control unit also supports multi-level confirmation and review functions for test results. Users can review the test results through the human-computer interaction module to ensure the accuracy and reliability of the judgment. For test results that require further analysis, the system provides a data export function that supports exporting test data to common data analysis software (such as Excel, MATLAB, etc.), which is convenient for users to conduct in-depth analysis and research.

[0130] Through the detailed implementation of the above steps (a) to (f), the present invention provides an efficient, accurate and intelligent method for testing multiple types of converter valves. The system implements a user-friendly operation interface through a human-computer interaction module. The main control unit integrates intelligent control and adaptive algorithms. The output control unit and the shared power supply module ensure stable and diversified power supply. The sampling unit monitors key parameters in real time. The display module intuitively displays test information, and the storage module reliably saves test data. The overall system structure is reasonable, and the modules work together to meet the testing requirements of different types of converter valves, significantly improve test efficiency and data accuracy, and has broad application prospects and significant technical advantages.

[0131] Embodiment 4:

[0132] Parameter comparison using an adaptive test algorithm:

[0133] The adaptive test algorithm built into the main control unit is designed to compare the collected voltage and current parameters with the preset standard parameters in real time to ensure the accuracy and consistency of the test results. The algorithm dynamically adjusts the test conditions by combining the predictive control model to minimize the error between the actual output and the reference standard. The specific implementation plan is as follows:

[0134] Parameter matching:

[0135] During the test initialization phase, the user selects specific test items and test modes through the human-computer interaction module. The adaptive test algorithm automatically loads the standard parameter set of the corresponding converter valve type according to the test items selected by the user. These parameter sets include voltage, current, frequency, pulse width, etc., and different reference values ​​and tolerance ranges are set according to the model and type of the converter valve.

[0136] Implementation details:

[0137] Definition of standard parameter set: The standard parameter set of each converter valve type is pre-stored in a system database (such as a database), including voltage range (such as V_min to V_max), current range (I_min to I_max), switching frequency (f), pulse width (PW), etc.

[0138] Parameter matching process: When the test starts, the main control unit will automatically retrieve the corresponding standard parameter set according to the test items selected by the user. Taking the thyristor valve as an example, the test system will load the tolerance range of the standard voltage value (such as 1000V) and current value (such as 200A) of the thyristor for subsequent adjustment and comparison by the adaptive algorithm.

[0139] Dynamic Adjustment:

[0140] During the test, the adaptive test algorithm analyzes the collected voltage and current data in real time through a predictive control model, and dynamically adjusts the comparison standard according to the changes in test conditions. The core goal of this model is to ensure that the test conditions are always in the best state by minimizing the difference between the system output (i.e., the voltage and current measured in real time) and the reference standard (i.e., the preset voltage and current).

[0141] The calculation formula for the control target is:

[0142]

[0143] in, is the output value of the system at the kth moment, is the preset target reference value, For control variables The amount of change, is the weight coefficient of the control action, is the length of the prediction time domain, To control the length of the time domain

[0144] in:

[0145] J: The cost function of the control objective, which represents the sum of squares of the error between the actual output and the target reference value, and the weighted sum of squares of the control action changes in the entire prediction time domain. The algorithm minimizes the error during the test by minimizing this objective function.

[0146] : System output value, that is, the voltage or current data collected at the kth moment.

[0147] : Target reference value, which means the preset voltage or current standard value (such as 1000V voltage or 200A current preset according to the test requirements of thyristor valve).

[0148] : The change of the control variable indicates the voltage or current value adjusted by the output control unit at the kth moment. The size of this value directly affects the adjustment rate and accuracy of the system.

[0149] : The weight coefficient of the control action, which controls the balance between error minimization and system response speed. The value will limit the frequency and amplitude of the power supply output change, thereby improving the stability of the system; a smaller The value enables the system to respond quickly to error changes.

[0150] : The length of the prediction time domain, which means that the algorithm predicts the system output at multiple moments in the future, that is, the future voltage and current change trends.

[0151] : Controls the length of the time domain, which determines the number of voltage or current adjustments allowed in each test cycle. The longer this parameter is set, the greater the adjustment range of the system, which is suitable for scenarios with higher error requirements in testing.

[0152] The adaptive algorithm adopts a closed-loop feedback control strategy to calculate the output value by real-time monitoring the voltage and current of the converter valve. With reference value and adjust the control variables according to the prediction model This adjustment is mainly reflected in the control of the power module by the output control unit.

[0153] Each time the algorithm iterates, it uses historical test data to predict future voltage and current changes and adjusts the output control unit in advance. Taking the thyristor valve test as an example, if a trend of current exceeding the standard value is detected during high-frequency switching operation, the algorithm will dynamically adjust the power supply output current to keep it within the set range.

[0154] The adaptive test algorithm has an anomaly detection function that can identify and filter out abnormal data caused by test equipment failure or external interference to ensure the accuracy of parameter comparison. This function relies on multi-level monitoring and analysis of collected data, mainly including noise filtering, data consistency detection and equipment fault judgment.

[0155] Noise filtering and data smoothing: During the test, the voltage and current signals may be interfered by noise. To ensure the accuracy of the data, the system first performs digital filtering (such as low-pass filtering or moving average filtering) on ​​the collected signals to remove high-frequency noise or burst signal interference. Taking thyristor testing as an example, the filter can effectively smooth the current spikes at the switching moment to ensure the continuity of the signal.

[0156] Data consistency check: The algorithm verifies the internal relationship between voltage and current signals to ensure data consistency. For example, based on Ohm's law (V=I*R), the algorithm periodically verifies whether the measured voltage and current values ​​match the preset resistance values. If inconsistencies are found, the data is considered abnormal.

[0157] Equipment fault diagnosis: The adaptive algorithm also integrates the equipment status monitoring module to detect the operation of the sampling unit, sensor and data transmission link in real time. If a sensor failure or data loss is found, the algorithm will automatically trigger the protection mechanism, suspend the test and record the fault information.

[0158] In summary, the main control unit can effectively realize the three functions of parameter matching, dynamic adjustment and anomaly detection through the built-in adaptive test algorithm. The algorithm is based on the predictive control model and optimizes the voltage and current adjustment of the output control unit in real time during the test to ensure the accuracy of the test results. By minimizing the difference between the system response and the preset standard, the system can maintain efficient and accurate testing results under various environmental conditions.

[0159] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A test method applicable to LCC converter valves and CLCC converter valves, characterized in that: The testing method includes Follow these steps: (a) Select test items and corresponding test modes according to test requirements through the human-computer interaction module of the main control unit; (b) The main control unit controls the output control unit to provide appropriate power output from multiple shared power modules according to test requirements. Output to the converter valve to be tested; (c) real-time monitoring of voltage and current parameters through sampling units; (d) the main control unit dynamically adjusts the power output of the output control unit according to the voltage and current parameters monitored in real time by the sampling unit; (e) The main control unit uses an adaptive test algorithm to compare the monitored parameters with the preset standards; (f) Determine whether the converter valve under test passes the test based on the comparison result: Wherein, the test method is based on a test device that meets the test requirements of both the thyristor valve and the IGBT submodule; The adaptive test algorithm includes a parameter matching method, wherein the parameter matching method includes automatically loading a standard parameter set of a corresponding converter valve type, wherein the standard parameter set includes a voltage range, a current range, a frequency, and a pulse width; The main control unit automatically retrieves and loads the corresponding standard parameter set according to the test items selected by the user for subsequent adjustment and comparison.

2. A test method applicable to LCC converter valves and CLCC converter valves according to claim 1, characterized in that: The power supply types output by the power supply module include: 100V DC source, high-voltage DC source, high-voltage pulse source and current source.

3. A test method applicable to LCC converter valves and CLCC converter valves according to claim 1, characterized in that: The adaptive test algorithm includes a dynamic adjustment method, which dynamically adjusts the comparison standard according to the change of the test conditions to minimize the difference between the system output and the target reference value; and is achieved by controlling the cost function of the target.

4. A test method applicable to LCC converter valves and CLCC converter valves as claimed in claim 3, characterized in that: The cost function of the control objective The calculation formula is: in, is the output value of the system at the kth moment, is the preset target reference value, For control variables The amount of change, is the weight coefficient of the control action, is the length of the prediction time domain, To control the length of the time domain.

5. A test method applicable to LCC converter valves and CLCC converter valves as claimed in claim 4, characterized in that: The adaptive test algorithm monitors the voltage and current of the converter valve in real time through a closed-loop feedback control strategy, calculates the error between the output value and the target reference value, adjusts the control variable according to the prediction model, and controls the output control unit to operate the power module.

6. A test method applicable to LCC converter valves and CLCC converter valves according to claim 1, characterized in that: The adaptive test algorithm includes an anomaly detection method, which processes the collected voltage and current signals through noise filtering and verifies whether the internal relationship between the voltage and current signals meets the preset standards; monitors the status of the sampling unit, sensor and data transmission link, and triggers the protection mechanism if a fault is found.

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