Intelligent rapid test system for cascade converter valve

Abstract

The application discloses a kind of cascaded converter valve intelligentization quick test system, by test power supply, series reactor, charging circuit, quick connecting line / row, control system and measurement system composition.The application is measured valve group test state conversion by quick connecting line / row, without disassembling converter valve internal connection copper row or connecting line, only need to increase quick connecting line / row to realize the erection of test circuit.Measurement system acquires the voltage and current waveform data of each power module in the converter valve to be measured;Automatic test program is integrated in the control system, including charging test, function test, power test and bypass test, the control system realizes one-key start, automatic, batch full device test, and judges the full chain device state of the converter valve to be measured according to the feedback of test system, and automatically generates test report.The application can realize efficient, automatic, full link, batch converter valve test of one-step start, greatly improve test efficiency, reduce cost and manpower investment.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and in particular to an intelligent rapid testing system for cascaded converter valves. Background Technology

[0002] Converter valves are core components of new power systems, converting DC and AC signals in high-voltage power systems and are widely used in power generation, transmission, and distribution systems. Cascading multiple power modules directly can increase the direct voltage level of the converter valve, improve equipment capacity, and reduce losses, making it the most mainstream technology for high-voltage converter valves. As voltage levels increase, the number of power modules that need to be cascaded in the converter valve also increases; a single converter valve may contain thousands of power modules. This results in a massive testing workload, including factory testing, field testing, and maintenance, with long power outage times and high manpower requirements. Traditional testing methods typically use a single small-capacity DC testing device to test one module at a time, which is inefficient, has a limited testing range, and may even damage the optical link due to fiber optic cable removal and installation. While adding a DC power supply unit to the DC side of the power module allows for batch testing, this requires an additional DC rectification system, resulting in large equipment footprints, high harmonic content, and the inability to test the internal diode devices within the power module. Batch testing of power modules by applying power on the AC side requires high-voltage frequency converters or high-voltage transformers. The test conditions are harsh, and the test equipment requires a large investment and a large footprint, which is not conducive to flexible layout. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an intelligent rapid testing system and method for cascaded converter valves, applicable to in-plant and field testing of cascaded converter chains in high-voltage direct current (HVDC) and flexible alternating current transmission (FACTS) systems. This method requires only a low-voltage, small-capacity AC power supply. Through optimized circuit design and automated control, it enables parallel testing of multiple modules, significantly improving testing efficiency and reducing costs and manpower.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] This invention provides an intelligent rapid testing system for cascaded converter valves, including a test power supply, an AC switch, a series reactor, a charging circuit, quick-connect cables / bars, a control system, and a measurement system;

[0006] The test power supply is connected to the AC switch, the AC switch is directly connected to the charging circuit, the charging circuit is directly connected to the series reactor, and the series reactor is connected to the converter valve under test.

[0007] The measurement system collects voltage and current waveform data of each power module in the converter valve under test and sends the test results to the control system.

[0008] The control system communicates with the converter valve power module and is connected to the measurement system. The control system acquires the test data collected by the measurement system and controls the test power supply, AC switch and bypass switch in the charging circuit.

[0009] The cascaded structure of the converter valve under test is changed to the first and second test sections of the power module under test through the quick connection line / bar. Each power module in the two test sections is connected in parallel with other power modules. The power modules of the first and second test sections are both two-port networks, namely port 1 and port 2. Port 2 is used for interconnection and is connected to the neutral point of the test power supply. Port 1 is connected to the series reactor. The middle output of the series reactor is connected to the test power supply, AC switch and charging circuit.

[0010] Preferably, the control system includes a control device and a valve control unit; the measurement system includes a current testing unit and a voltage testing unit; and the charging circuit includes a charging resistor and a bypass switch.

[0011] The control device is connected to the valve control unit, and the valve control unit is connected to the power module of the converter valve under test. The valve control unit is used to convert the modulation signal in the control device into a switching signal that the power module can recognize, and at the same time forward the communication signal of the power module to the control device.

[0012] The control device is connected to the current testing unit and the voltage testing unit;

[0013] The control device is connected to the control circuit of the bypass switch in the charging circuit;

[0014] The control device is connected to the control circuit of the AC switch;

[0015] The control device integrates an automatic testing program to acquire test data during the testing process, record test results, provide the status of the tested components based on pre-set criteria, and automatically generate test reports.

[0016] Preferably, the test power supply is a low-voltage AC power supply, equipped with a transformer. The secondary voltage after transformation by the transformer should not be lower than the minimum operating voltage of a single working power module of the converter valve under test, and should not be higher than the maximum operating voltage of a single working power module.

[0017] Preferably, the quick-connect cable / row has a reserved connector for connecting to the power module under test;

[0018] The quick-connect cable / bar uses alligator clips and test terminal connectors.

[0019] Preferably, when the number of power modules cascaded in the converter valve under test is 4N, the port 2 of the first part under test and the second part under test is located between the 2Nth and 2N+1th units; when the number of power modules cascaded in the converter valve under test is 2N+1, the port 2 of the first part under test and the second part under test is located between the Nth and N+1th units or between the N+1th and N+2th units.

[0020] Preferably, the original connecting lines / rows of the cascaded structure of the converter valve under test do not need to be removed, and each power module is connected in parallel with the original connecting lines / rows through quick connecting lines / rows.

[0021] Preferably, the control device integrates an automatic test program, including a charging test, a functional test, a power test, and a bypass test.

[0022] Preferably, the charging test process is as follows: The control system controls the AC switch to switch from open to closed, energizing the entire test system. The test power supply powers the converter valve under test through the charging resistor and series reactor. At this time, the converter valve under test is locked. The test power supply charges the capacitor through the diode. After the capacitor voltage reaches the minimum operating voltage of the power module, the internal control board of the power module performs a self-test, measures the capacitor voltage, and sends the self-test result and capacitor voltage charging data to the valve control unit via the optical link. The valve control unit sends the data to the control device. The control device determines whether the capacitor, diode, power module control board, optical link, and valve control unit are working properly based on the voltage change rate during charging, the final charging voltage deviation, the self-test result of the power module control board, and the communication result of the power module control board, and records the charging test results.

[0023] Preferably, the functional test process is as follows: the control device issues an unlocking command, the valve control unit turns on and off the power electronic fully controlled power devices in the power module according to the unlocking signal issued by the control device, the control device compares the voltage and current results sampled by the measurement system with the expected results to determine whether the power devices are switching normally, and then determines whether the fully controlled power devices, valve control unit, optical link and power module control board are working normally, and records the functional test results.

[0024] Preferably, the power test is carried out after the functional test is completed. The power test is carried out simultaneously by one power module in the first test section and one power module in the second test section. Their output reactive currents are equal in magnitude and opposite in direction, and they do not absorb or inject reactive power from the power supply circuit. The power module under test should be able to output rated current, long-term overload current and short-term overload current according to the control command. The control system judges whether the power test is normal through the power module control board, the current and voltage test results of the test system, and the temperature sampling results of the cooling system, and records the test results of the corresponding power module number. After completion, it automatically switches to the next pair of power modules until all tests are completed.

[0025] If the total number of power modules under test is odd, then each power module needs to be tested once more to ensure that the tests are always carried out in pairs.

[0026] Preferably, the bypass test process is as follows: First, the control device issues an AC switch opening command to disconnect the power supply circuit of the low-voltage DC power supply. Second, the control device issues a bypass switch closing command and collects the bypass switch closing status monitored by the power module control board. Based on the bypass switch closing result and time delay, it is determined whether the status of the bypass switch and its control circuit is normal and recorded.

[0027] Preferably, the first test module and the second test module are tested simultaneously during the functional test, and the functional tests of two power modules are carried out at one time until all are completed.

[0028] Preferably, the power test is carried out after the functional test is completed, and it is necessary to confirm that the quick-connect cable / bar can withstand the current required for the power test. The current required for the power test is consistent with the maximum operating current of the converter valve under test. At the same time, the maximum operating current of the series reactor also needs to be greater than the test current. The cooling system of the converter valve under test should be started during the power test to ensure its normal operation.

[0029] The beneficial effects achieved by this invention are as follows:

[0030] (1) The present invention can build the test circuit using a low-voltage, small-capacity AC power supply, a reactor, and a shorting wire. The converter valve and control and protection system are provided by the system under test, reducing equipment investment and operating costs. Moreover, the AC low-voltage power supply combined with its own rectification improves the stability and safety of the system.

[0031] (2) This invention can complete batch testing in one go, shortening testing time and manpower consumption. It can verify a wide range of tests at once, and the test mode can be quickly switched to adapt to different testing needs.

[0032] (3) The control system of the present invention pre-trains the program algorithm by collecting abnormal test data in advance, runs the artificial intelligence algorithm in the control system, and provides suggestions for abnormal judgment in combination with test data, thus providing assistance to test personnel. Attached Figure Description

[0033] Figure 1 A schematic diagram of the intelligent rapid testing system for cascaded converter valves provided by the present invention;

[0034] Figure 2 This is an equivalent schematic diagram of the module power counter-propagation in this invention;

[0035] Figure 3 This is a flowchart illustrating a typical batch testing method in this invention. Detailed Implementation

[0036] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "end", "bottom", "side", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limiting this invention.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "installation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a direct connection, or a connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0039] Secondly, the term "an embodiment" or "embodiment" as used in this invention refers to a specific feature, structure, or characteristic that can be included in at least one implementation of this invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0040] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0041] See Figure 1This invention provides an intelligent rapid testing system for cascaded converter valves, including a test power supply, an AC switch, a series reactor, a charging circuit (charging resistor and bypass switch), quick connection cables / bars, a control system, and a measurement system.

[0042] The test power supply is connected to an AC switch, which is directly connected to the charging circuit. The charging circuit is directly connected to a series reactor, which is then connected to the converter valve under test.

[0043] The control system communicates with the converter valve power module and connects to the measurement system to acquire the test data collected by the measurement system, while controlling the test power supply, AC switch and bypass switch in the charging circuit.

[0044] In this invention, the test power supply is a low-voltage AC power supply, which can be configured with a transformer. The transformer is connected in series between the low-voltage AC power supply and other test equipment. The secondary voltage after the transformer transformation should not be lower than the minimum operating voltage of a single working power module of the converter valve under test and not higher than its maximum operating voltage. There is no need to configure rectifier equipment, and standard AC power is directly provided to the module under test to carry out the test.

[0045] Taking a power module with a rated voltage of 975V as an example, the input low-voltage power supply is selected as 220V. After being stepped up by a transformer (turn ratio 220V / 690V), the effective value of the secondary side voltage is 690V, and the peak value is 975V. After passing through the current-limiting resistor, the power module is charged to reach the normal operating voltage of the power module, enabling the power module to achieve rated voltage operation and testing. Compared with other low-voltage testing or DC-side power supply solutions, the AC power supply solution can realize diode rectification section verification, no external test terminals on the DC side, and comparison of charging curves of multiple modules.

[0046] In this invention, the quick-connect cable / row has a pre-installed connector for easy connection, which can be quickly connected to the power module under test, such as by alligator clips, test terminal connectors, etc.

[0047] In this invention, the control system includes a control device and a valve control unit. The control device and valve control unit can be used in conjunction with the valve assembly under test, or they can be configured separately for testing. When using a matching control system, the test program should be updated, or the test function should be enabled before conducting the test. After the test, the function should be disabled or the engineering program restored. The valve control unit serves as the communication control between the control device and the power module. The valve control unit is responsible for converting the modulation signal in the control device into a switching signal that the power module can recognize, and simultaneously forwarding the summarized communication signal from the power module to the control device.

[0048] In this invention, the measurement system includes a current testing unit and a voltage testing unit, which are used to collect voltage and current waveform data of each power module and send the test results to the control system for control and result determination during the test process.

[0049] The intelligent testing method based on the above-mentioned intelligent rapid testing system for cascaded converter valves includes the following steps: test circuit connection, control system connection, batch automatic testing, test report generation, and dismantling and restoration after the test.

[0050] The test circuit connection includes: the connection of the test power supply, transformer (if any), charging circuit, series reactor, converter valve under test, and measurement circuit.

[0051] The control system connections include: connection between the control device and the valve control unit, connection between the valve control unit and the converter valve power module, connection between the control device and the current testing unit and the voltage testing unit, connection between the control device and the control circuit of the bypass switch in the charging circuit, and connection between the control device and the control circuit of the AC switch.

[0052] The cascaded structure of the converter valve under test needs to be changed to the first and second test sections of the power module under test via quick-connect cables / bars. Each power module in the two test sections is connected in parallel with other power modules. The power modules of the first and second test sections are both two-port networks, namely port 1 and port 2. Port 2 is used to connect to each other and to the power supply neutral point. Port 1 is connected to the series reactors respectively. The middle output of the series reactors is connected to the test power supply, AC switch, charging circuit and other equipment.

[0053] It should be noted that the original connecting lines / rows of the cascaded structure of the converter valve under test do not need to be removed. Each power unit can be connected in parallel with the original connecting lines / rows through quick connecting lines / rows.

[0054] Depending on the number of power modules under test (DUTs) in the cascaded structure, the positions of port 2 for the first and second DUTs differ. When there are 4N power modules, the positions of port 2 for the first and second DUTs should be between 2N and 2N+1 modules; when there are 2N+1 power modules, the positions of port 2 for the first and second DUTs should be between the Nth and N+1th modules, or between the N+1th and N+2th modules.

[0055] Batch automated testing includes: charging test, functional test, power test, and bypass test.

[0056] When starting the test program, first set the test parameters (such as voltage and current thresholds) and select the test mode (such as charging test, power test, or bypass test). Then, turn on the test power supply. The AC power, after being boosted and filtered, is applied to all parallel power modules through the quick-connect cable. The diodes inside the power modules rectify the AC power into DC power, charging the capacitors and activating them. The control system synchronously sends trigger signals to all power modules, and the measurement system rapidly acquires the voltage and current waveform data of each power module.

[0057] See the charging test procedure. Figure 3 The process includes the following steps: The control system controls the AC switch to switch from open to closed, energizing the entire test system. The test power supply powers the converter valve under test through a charging resistor and a series reactor. At this time, the converter valve under test is locked. The AC power supply charges the capacitor through the diode. After the capacitor voltage reaches the minimum operating voltage of the power module, the internal control board of the power module performs a self-test and measures the capacitor voltage. The self-test result and the capacitor voltage charging data are sent to the valve control unit via the optical link. The valve control unit sends the data to the control device. The control device judges whether the capacitor, diode, module control board, optical link, and valve control unit are working properly based on the voltage change rate during charging, the final charging voltage deviation, the self-test result of the power module control board, and the communication result of the module control board, and records the charging test results.

[0058] The functional test process is as follows: The control device issues an unlock command, and the valve control unit, based on the unlock signal issued by the control device, turns the fully controlled power electronic devices in the power module on and off. The control device compares the voltage and current results sampled by the measurement system with the expected results to determine whether the power devices are switching normally. Furthermore, it determines whether the fully controlled devices, valve control unit, optical link, and power module control board of the power module are functioning correctly, and records the functional test results. The functional test can be conducted simultaneously on the first and second parts under test, performing functional tests on two power modules at a time until all are completed. Figure 2 A simplified functional test schematic diagram is provided.

[0059] Power testing is generally conducted after functional testing. It must be confirmed that the quick-connect cable / bar can withstand the current required for the power test. This current is generally consistent with the maximum operating current of the converter valve under test (DUT), and the maximum operating current of the series reactor should also be greater than the test current. During the power test, the cooling system of the DUT should be activated to ensure its normal operation. The power test is conducted simultaneously by one power module from the first DUT and one power module from the second DUT. Their output reactive currents are equal in magnitude and opposite in direction, and they do not absorb or inject reactive power from the power supply circuit. The DUT should be able to output rated current, long-term overload current, and short-term overload current according to control commands. The control system determines whether the power test is normal based on the module control board, the current and voltage test results of the test system, and the temperature sampling results of the cooling system, and records the test results for the corresponding power module number. After completion, it automatically switches to the next pair of power modules until all tests are completed. If the total number of DUTs is odd, one power module should be tested twice to ensure that tests are always conducted in pairs.

[0060] The bypass test process is as follows: It is generally carried out after other tests are completed. First, the control device issues an AC switch opening command to disconnect the power supply circuit of the low-voltage AC power supply. Then, the control device issues a bypass switch closing command and collects the bypass switch closing status monitored by the power module control board. Based on the bypass switch closing result and time delay, it is determined whether the status of the bypass switch and its control circuit is normal and recorded.

[0061] It should be noted that when only a single-phase low-voltage AC power supply is available, a single-phase mode can also be used, which consists of a single-phase low-voltage AC power supply, a single-phase AC switch, a single-phase charging circuit, a single-phase series reactor, a single-phase converter valve under test, or a three-phase converter valve connected in parallel.

[0062] The control device records the results of charging tests, functional tests, power tests, and bypass switch tests. Based on pre-set criteria, it provides the status of all tested components, automatically generates test reports, and allows test personnel to obtain the reports by printing or exporting them to complete all tests.

[0063] This invention integrates an automated program into the test system control device (or server, backend computer) to analyze collected data in real time, compare it with preset standards, and determine whether the module is qualified. Test results are automatically generated into a report, including the module number, test parameters, and conclusions. The entire analysis process is carried out synchronously during the test, supporting batch processing of dozens of modules. It can also integrate artificial intelligence algorithms, trained for anomaly data identification, to identify and separate specific anomalies in test results, and, based on test data, provide maintenance and repair suggestions for test personnel.

[0064] This invention enables rapid, batch, and automated testing of converter valve modules, improving production efficiency and reliability. The above embodiments are merely examples; those skilled in the art can adjust parameters and components according to actual needs.

[0065] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A smart rapid testing system for cascaded converter valves, characterized in that, Includes test power supply, AC switch, series reactor, charging circuit, quick connection cable / bar, control system and measurement system; The test power supply is connected to the AC switch, the AC switch is directly connected to the charging circuit, the charging circuit is directly connected to the series reactor, and the series reactor is connected to the converter valve under test. The measurement system collects voltage and current waveform data of each power module in the converter valve under test and sends the test results to the control system. The control system communicates with the converter valve power module and is connected to the measurement system. The control system acquires the test data collected by the measurement system and controls the test power supply, AC switch and bypass switch in the charging circuit. The cascaded structure of the converter valve under test is changed to the first and second test sections of the power module under test through the quick connection line / bar. Each power module in the two test sections is connected in parallel with other power modules. The power modules of the first and second test sections are both two-port networks, namely port 1 and port 2. Port 2 is used for interconnection and is connected to the neutral point of the test power supply. Port 1 is connected to the series reactor. The middle output of the series reactor is connected to the test power supply, AC switch and charging circuit.

2. The intelligent rapid testing system for cascaded converter valves according to claim 1, characterized in that, The control system includes a control device and a valve control unit; the measurement system includes a current testing unit and a voltage testing unit; the charging circuit includes a charging resistor and a bypass switch. The control device is connected to the valve control unit, and the valve control unit is connected to the power module of the converter valve under test. The valve control unit is used to convert the modulation signal in the control device into a switching signal that the power module can recognize, and at the same time forward the communication signal of the power module to the control device. The control device is connected to the current testing unit and the voltage testing unit; The control device is connected to the control circuit of the bypass switch in the charging circuit; The control device is connected to the control circuit of the AC switch; The control device integrates an automatic testing program to acquire test data during the testing process, record test results, provide the status of the tested components based on pre-set criteria, and automatically generate test reports.

3. The intelligent rapid testing system for cascaded converter valves according to claim 1, characterized in that, The test power supply is a low-voltage AC power supply with a transformer. The secondary voltage after the transformer transformation should not be lower than the minimum operating voltage of a single working power module of the converter valve under test, and should not be higher than the maximum operating voltage of a single working power module.

4. The intelligent rapid testing system for cascaded converter valves according to claim 1, characterized in that, The quick-connect cable / bar has a reserved connector for connecting to the power module under test; The quick-connect cable / bar uses alligator clips and test terminal connectors.

5. The intelligent rapid testing system for cascaded converter valves according to claim 1, characterized in that, When the number of power modules cascaded in the converter valve under test is 4N, the port 2 of the first part under test and the second part under test is located between the 2Nth and 2N+1th units; when the number of power modules cascaded in the converter valve under test is 2N+1, the port 2 of the first part under test and the second part under test is located between the Nth and N+1th units or between the N+1th and N+2th units.

6. The intelligent rapid testing system for cascaded converter valves according to claim 1, characterized in that, The existing connecting lines / rows of the cascaded structure of the converter valve under test do not need to be removed. Each power module is connected in parallel with the existing connecting lines / rows through quick connecting lines / rows.

7. The intelligent rapid testing system for cascaded converter valves according to claim 2, characterized in that, The control device integrates an automatic testing program, including charging test, functional test, power test and bypass test.

8. The intelligent rapid testing system for cascaded converter valves according to claim 7, characterized in that, The charging test process is as follows: The control system controls the AC switch to switch from open to closed, energizing the entire test system. The test power supply powers the converter valve under test through the charging resistor and series reactor. At this time, the converter valve under test is locked. The test power supply charges the capacitor through the diode. After the capacitor voltage reaches the minimum operating voltage of the power module, the internal control board of the power module performs a self-test, measures the capacitor voltage, and sends the self-test result and capacitor voltage charging data to the valve control unit via the optical link. The valve control unit sends the data to the control device. The control device judges whether the capacitor, diode, power module control board, optical link, and valve control unit are working properly based on the voltage change rate during charging, the final charging voltage deviation, the self-test result of the power module control board, and the communication result of the power module control board, and records the charging test results.

9. The intelligent rapid testing system for cascaded converter valves according to claim 7, characterized in that, The functional test process is as follows: The control device issues an unlocking command, and the valve control unit turns on and off the power electronic fully controlled power devices in the power module according to the unlocking signal issued by the control device. The control device compares the voltage and current results sampled by the measurement system with the expected results to determine whether the power devices are switching normally, and then determines whether the fully controlled devices of the power module, the valve control unit, the optical link and the power module control board are working normally, and records the functional test results.

10. The intelligent rapid testing system for cascaded converter valves according to claim 7, characterized in that, The power test is conducted after the functional test is completed. The power test is carried out simultaneously by one power module in the first test section and one power module in the second test section. Their output reactive currents are equal in magnitude and opposite in direction, and they do not absorb or inject reactive power from the power supply circuit. The power module under test should be able to output rated current, long-term overload current and short-term overload current according to the control command. The control system judges whether the power test is normal through the power module control board, the current and voltage test results of the test system, and the temperature sampling results of the cooling system, and records the test results of the corresponding power module number. After completion, it automatically switches to the next pair of power modules until all tests are completed. If the total number of power modules under test is odd, then each power module needs to be tested once more to ensure that the tests are always carried out in pairs.

11. The intelligent rapid testing system for cascaded converter valves according to claim 7, characterized in that, The bypass test process is as follows: First, the control device issues an AC switch opening command to disconnect the power supply circuit of the low-voltage DC power supply. Second, the control device issues a bypass switch closing command and collects the bypass switch closing status monitored by the power module control board. Based on the bypass switch closing result and time delay, it is determined whether the status of the bypass switch and its control circuit is normal and recorded.

12. The intelligent rapid testing system for cascaded converter valves according to claim 9, characterized in that, During the functional test, the first test unit and the second test unit are carried out simultaneously, and the functional tests of two power modules are carried out at one time until all are completed.

13. The intelligent rapid testing system for cascaded converter valves according to claim 10, characterized in that, The power test is conducted after the functional test is completed, and it is necessary to confirm that the quick-connect cable / bar can withstand the current required for the power test. The current required for the power test is consistent with the maximum operating current of the converter valve under test. At the same time, the maximum operating current of the series reactor must also be greater than the test current. The cooling system of the converter valve under test should be started during the power test to ensure its normal operation.

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