Performance test system and test method for NPC valve module

Abstract

The invention provides a performance test system and test method for an NPC valve module. The performance test method comprises the following steps: configuring two groups of same test devices; each group of testing device comprises a voltage regulator, an alternating current circuit breaker, a transformer, a molded case circuit breaker, an electric reactor and an NPC valve module which are sequentially connected in series, and a controller connected with the NPC valve module; the two groups of testing devices are connected with the same alternating current power supply through the connection between the NPC valve modules and the voltage regulator to form a testing loop; different test loops are formed by different connection modes and are used for carrying out different performance tests; the controller is used for issuing a control instruction to the NPC valve module to perform a corresponding performance test; the performance test result of the NPC valve module is determined through the operation state of the test device in the performance test; various performance tests can be performed on the NPC valve module under conventional conditions, performance detection of the NPC valve module before leaving a factory is realized, additional devices are not needed, and the NPC valve module performance detection device has universality.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible direct current power transmission, and in particular to a performance testing system and a testing method for an NPC valve module. Background Art

[0002] In some remote areas, there are still many border posts, fishermen, and herdsmen whose electricity is not connected to the main grid. The distance between the electricity load and the conventional power supply network is generally more than 20 km, and some are even up to hundreds of kilometers. However, with the continuous development of the economy in various places, the load in islands and remote areas is also growing rapidly, and the load density is constantly increasing. The current power supply network has problems such as mismatch between operating capacity and load growth, large intermittent power supply, difficult voltage management, and poor power quality. The pressure on the safe and stable operation of the system continues to increase. Flexible DC transmission based on VSC (Voltage Source Converter) technology is more flexible, economical, and environmentally friendly. It is particularly suitable for transmission distances ranging from tens of kilometers to hundreds of kilometers and transmission capacities ranging from several MW (megawatts) to hundreds of MW.

[0003] For renewable energy connected to weak grids, due to the intermittent and volatile nature of energy, oscillations are easily caused when connected to the AC grid, and the power flow cannot be flexibly controlled, faults are not easy to isolate in time, and the existence of reactive power loss makes it uneconomical. Flexible DC has the advantages of flexible control, rapid response, and the ability to provide emergency reactive power support. At the same time, the DC link avoids the problem of reactive power oscillations caused by intermittent power transmission, and is an ideal solution for connecting renewable energy to weak grids.

[0004] Therefore, a research result of VSC based on cascaded three-level neutral point clamping has gradually begun to be put into use in the flexible DC distribution scenario, integrating the respective technical advantages of flexible DC transmission technology and neutral point clamping three-level technology. In addition to the advantages of high power density and transmission efficiency, small footprint and good economic benefits, it also has the advantages of independent control of active and reactive power, low voltage ride-through, island operation, high power quality and low loss, which can effectively and flexibly coordinate and balance the multi-source power supply network power generation system mainly composed of local AC power grid, new energy power generation and fuel power generation. It can effectively solve the technical problems of long-distance power supply of weak power grid, has good application prospects, and is an effective solution to improve the stability of distribution network operation, build a multi-terminal DC distribution network based on VSC, and improve the flexibility and reliability of distribution network; island power supply, including offshore platforms and remote islands, mountainous areas, pastoral areas, etc., this solution can greatly improve the power supply reliability and power supply quality of the island system after renewable energy is connected; this achievement can be used as an ideal access means for distributed new energy, improve the ability of microgrids to absorb new energy, and greatly promote the industrial promotion of microgrids.

[0005] The core of the cascade three-level converter is the VSC valve based on IGBT (Insulated Gate Bipolar Transistor). The application of power transmission has extremely high requirements for the voltage level and capacity of the VSC valve. In order to fully verify the performance of the NPC valve, it is necessary to perform performance tests on it during factory testing, including full power tests and voltage stabilization tests, to fully evaluate the reliability, safety and stability of the design of IGBT devices, heat dissipation systems, and flow components.

[0006] There are generally two methods for full-power testing at present, direct testing and back-to-back dragging testing. The direct testing method has extremely high requirements for the voltage level and equipment capacity of the laboratory, and with the continuous increase in the capacity of the converter valve, it is difficult to achieve under conventional test environment conditions; while the back-to-back dragging test method has lower requirements for power supply capacity, but it is necessary to build another set of VSC converter valves of the same capacity level as a test device, which increases the test cost and requires the simultaneous operation of two sets of devices, which is more complex and less efficient. In addition, the device is only for a single performance test, that is, before the converter valve leaves the factory, it is necessary to use multiple devices to perform different performance tests on the valve module, which has the defects of poor compatibility, single function, and low cost performance. Summary of the invention

[0007] In order to overcome the above-mentioned deficiencies of the prior art, the present invention proposes a performance test system for an NPC valve module, comprising: two groups of test devices with the same configuration; each group of the test devices comprises a voltage regulator, an AC circuit breaker, a transformer, a molded case circuit breaker, a reactor and an NPC valve module connected in series in sequence, and a controller connected to the NPC valve module for controlling the NPC valve module;

[0008] The two groups of test devices are connected through the NPC valve modules, and the voltage regulators of the two groups of test devices are connected to the same AC power supply to form a test loop; wherein the two groups of test devices form different test loops through different connection modes between the two NPC valve modules, and the different test loops are used to perform different performance tests;

[0009] The controller is used to issue control instructions to the NPC valve module in the test device to which it belongs to perform corresponding performance tests for each performance test; and determine the performance test result of the NPC valve module according to the operating state of the test device in the performance test.

[0010] Optionally, the controller includes a pole control controller, a valve control controller and a valve base controller connected in sequence, the valve base controller is connected to the NPC valve module; the pole control controller is connected to an external host computer;

[0011] The valve control controller is used to receive the control instructions sent by the host computer, the control instructions include the control mode and the NPC valve module unlocking instruction; and determine the outer loop instruction value based on the analog quantity collected on the AC power supply side, and send the outer loop instruction value, the control mode and the NPC valve module unlocking instruction to the valve control controller; and is also used to receive the status information of the NPC valve module in the test device to which it belongs sent by the valve control controller;

[0012] The valve control controller is used to receive the outer loop command value, the control mode and the NPC valve module unlocking command; calculate the modulation wave based on the outer loop command value; send the control mode, the NPC valve module unlocking command and the modulation wave to the valve base controller; and receive the status information of the NPC valve module in the test device to which it belongs sent by the valve base controller, and forward the status information to the pole control controller;

[0013] The valve base controller is used to receive the control mode, the NPC valve module unlocking instruction and the modulation wave; generate a trigger signal based on the modulation wave; send the trigger signal, the control mode and the NPC valve module unlocking instruction to the NPC valve module in the test device to which it belongs; and receive status information sent by the NPC valve module in the test device to which it belongs, and forward the status information to the valve control controller.

[0014] Optionally, the status information includes an unlocking state, a molded case switch state, a bypass switch state, and an AC side current and a DC side voltage of the NPC valve module.

[0015] Optionally, the NPC valve module includes A, B, C three-phase power modules and a D-phase capacitor module connected in parallel.

[0016] Based on the above inventive concept, the present invention proposes a performance testing method for an NPC valve module based on a performance testing system, comprising:

[0017] Based on the above performance test system, a test loop is connected for the performance test required for the NPC valve module; the test loop is adjusted by a pressure regulator and a controller so that the test loop is in the system configuration required for the performance test;

[0018] Under the system configuration, the controller is used to put the NPC valve module into operation according to the control instructions issued by the host computer; the host computer is used to monitor the operation status of the test device in the performance test system to determine the performance test result of the NPC valve module.

[0019] Optionally, the performance test required for the NPC valve module includes a power performance test based on a towing test;

[0020] The performance test required for the NPC valve module connects a test loop; and uses a pressure regulator and a controller to adjust the test loop so that the test loop is in a system configuration required for the performance test, including:

[0021] In the pair-drag experiment, the positive electrodes and negative electrodes of the DC sides of the two NPC valve modules in the two groups of test devices of the performance test system are connected to each other respectively, and the two voltage regulators are connected to the same AC power supply to form a test loop, and the test loop is connected;

[0022] The two groups of test devices are respectively determined as the two stages of the test loop, and one stage is set as the voltage stabilizing side of the stable output voltage and the other stage is set as the power side of the stable output power by using a controller according to the control mode sent by the upper computer;

[0023] The two-stage voltage regulator is used to adjust the two NPC valve modules to the rated voltage respectively, so as to complete the DC side voltage charging of the two NPC valve modules and complete the system configuration required for the power performance test.

[0024] Optionally, the step of using the controller to put the NPC valve module into operation according to a control instruction issued by a host computer; and using the host computer to monitor the operation status of a test device in the performance test system to determine a performance test result of the NPC valve module includes:

[0025] The controller is used to send an NPC valve module unlocking instruction to the NPC valve module on the voltage stabilizing side and the NPC valve module on the power side, so that the NPC valve module is in operation; the control instruction includes a control mode and an NPC valve module unlocking instruction;

[0026] Using the host computer to adjust the power of the two NPC valve modules on the power side; and using the host computer to monitor the operating state of the test device at different powers, and obtaining the power performance test result of the NPC valve module according to the operating state;

[0027] The two NPC valve modules are respectively connected to a group of controllers, and the two groups of controllers share one host computer.

[0028] Optionally, using the host computer to adjust the power of the two NPC valve modules on the power side; and using the host computer to monitor the operating state of the test device at different powers, and obtaining the performance test result of the NPC valve module according to the operating state, includes:

[0029] Using the host computer to gradually increase the power of the two NPC valve modules on the power side to below the rated power, and running for a preset time period;

[0030] If the NPC valve module on the voltage stabilizing side and at least one stage of the power side operate abnormally within the time period, the experiment is stopped;

[0031] If both the voltage stabilizing side and the power side operate normally within the time period, the power of the two NPC valve modules is adjusted to the rated power for a preset time period; if one stage operates abnormally, the power performance test of the NPC valve module in the abnormally operating stage is determined to be unqualified; otherwise, the power performance test of the NPC valve module is determined to be qualified;

[0032] The operation abnormality includes: the temperature of the NPC valve module exceeds the temperature threshold, the voltage value of the NPC valve module exceeds the voltage threshold, and the test device trips and locks.

[0033] Optionally, the performance test required for the NPC valve module includes a voltage performance test based on a voltage stabilization test;

[0034] The performance test required for the NPC valve module connects a test loop; and uses a pressure regulator and a controller to adjust the test loop so that the test loop is in a system configuration required for the performance test, including:

[0035] In the voltage stabilization experiment, the positive electrode of one NPC valve module in the two test devices of the performance test system is connected to the negative electrode of the other NPC valve module, and the two voltage regulators are connected to the same AC power supply to form a test loop, and the test loop is connected;

[0036] Using a controller to set the test circuit to a voltage stabilization mode for stabilizing the output voltage according to a control mode sent by a host computer;

[0037] The two voltage regulators are used to adjust the two NPC valve modules to the rated voltage respectively, and the DC side voltage of the NPC valve modules is charged, thereby completing the system configuration required for the voltage performance test.

[0038] Optionally, using the controller to put the NPC valve module into operation according to a control instruction issued by a host computer; using the host computer to monitor the operation state of a test device in the performance test system to determine a performance test result of the NPC valve module includes:

[0039] Using the controller to issue an NPC valve module unlocking instruction to the two NPC valve modules, so that the two NPC valve modules are in operation state;

[0040] Using the host computer to monitor the DC voltage of two NPC valve modules in the test device, and obtaining the voltage performance test result of the NPC valve module according to the DC voltage;

[0041] Among them, the two NPC valve modules share the same set of the host computer, pole control controller and valve control controller, the valve control controller is connected to the two valve base controllers through a plurality of reserved valve base controller interfaces, and the two valve base controllers are respectively connected to the two NPC valve modules for controlling the two NPC valve modules.

[0042] In another aspect, the present application further provides an electronic device, comprising: at least one processor and a memory; the memory and the processor are connected via a bus;

[0043] The memory is used to store one or more programs;

[0044] When the one or more programs are executed by the at least one processor, a performance testing method for an NPC valve module based on a performance testing system as described above is implemented.

[0045] On the other hand, the present application further provides a computer-readable storage medium having an execution program stored thereon, and when the execution program is executed, a performance testing method for an NPC valve module based on a performance testing system as described above is implemented.

[0046] Compared with the closest prior art, the present invention has the following beneficial effects:

[0047] The present invention provides a performance test system for an NPC valve module, comprising: two groups of test devices with the same configuration; each group of the test devices comprises a voltage regulator, an AC circuit breaker, a transformer, a molded case circuit breaker, a reactor and an NPC valve module connected in series in sequence, and a controller connected to the NPC valve module for controlling the NPC valve module; the two groups of the test devices form a test loop through the connection between the NPC valve modules and the voltage regulator being connected to the same AC power supply; different connection modes between the two NPC valve modules form different test loops for performing different performance tests; the controller is used to issue control instructions to the NPC valve module in the test device to which it belongs for each performance test to perform corresponding performance tests; the performance test result of the NPC valve module is determined by the running state of the test device in the performance test; the present invention can complete various performance tests of the NPC valve module under normal conditions by changing the wiring mode between the two NPC valve modules in the system and the control instructions of the controller connected to the NPC valve module, thereby realizing the performance detection of the NPC valve module before leaving the factory, without the need for additional devices, having universality and compatibility, and having a higher cost-effectiveness than a test device with a single function.

[0048] The present invention provides a performance testing method for an NPC valve module based on a performance testing system, comprising: based on the above-mentioned performance testing system, connecting a test circuit for the performance test required for the NPC valve module; using a voltage regulator and a controller to adjust the test circuit so that the test circuit is in the system configuration required for the performance test; under the system configuration, using the controller to put the NPC valve module into operation according to the control instructions issued by the host computer; using the host computer to monitor the operation status of the test device in the performance testing system to determine the performance test result of the NPC valve module; in the present application, by changing the wiring method of the test circuit in the performance testing system and the corresponding system configuration, the corresponding performance test can be performed under the control instruction of the controller without the need for additional devices, and various performance tests of the NPC valve module can be realized before leaving the factory, which has universality and compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic diagram of the structure of a performance test system for an NPC valve module provided by the present invention;

[0050] Figure 2 A schematic diagram of the topological structure of the NPC valve module provided by the present invention;

[0051] Figure 3 A control block diagram of the towing test provided by the present invention;

[0052] Figure 4 A schematic diagram of the structure of a test system for voltage stabilization test provided by the present invention;

[0053] Figure 5 A control block diagram of the voltage stabilization test provided by the present invention;

[0054] Figure 6 A schematic flow chart of a performance testing method for an NPC valve module based on a performance testing system provided by the present invention;

[0055] Figure 7 The present invention provides a schematic structural diagram of an electronic device. DETAILED DESCRIPTION

[0056] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0057] Example 1

[0058] The present invention provides a performance test system for an NPC valve module, including various devices, platform structures and control structures required for the test system (test platform), such as Figure 1 As shown, it specifically includes: two groups of test devices with the same configuration; each group of the test devices includes a voltage regulator, an AC circuit breaker ( Figure 1 Circuit breakers in the transformer, molded case circuit breaker, reactor and NPC valve module, and a controller connected to the NPC valve module for controlling the NPC valve module; wherein the NPC (Neutral Point Clamped Valve Module) valve module is a valve module of a neutral point clamped converter valve;

[0059] The two groups of test devices are connected through the NPC valve modules, and the voltage regulators of the two groups of test devices are connected to the same AC power supply to form a test loop; wherein the two groups of test devices form different test loops through different connection modes between the two NPC valve modules, and the different test loops are used to perform different performance tests;

[0060] The controller is used to issue control instructions to the NPC valve module in the test device to which it belongs to perform corresponding performance tests for each performance test; and determine the performance test result of the NPC valve module according to the operating state of the test device in the performance test.

[0061] The two groups of test devices are respectively one level of the test (divided into positive and negative poles), and the AC power supply in this embodiment is a 380V AC power supply.

[0062] The voltage regulator, AC circuit breaker, transformer, molded case circuit breaker, reactor and NPC valve module of the two groups of test devices, as well as the connected AC power supply are all three-phase lines; wherein the voltage regulator is used to adjust the voltage in the test circuit, and the transformer is used to step up the voltage output by the AC power supply after adjustment by the voltage regulator to the rated voltage of the NPC valve module. In this embodiment, the voltage regulator is used to adjust the voltage output by the AC power supply to 380V, and the transformer is used to step up the adjusted 380V voltage to the rated voltage of the valve module of 690V. The molded case circuit breaker and the AC circuit breaker are used to connect the circuit, as well as to trip the protection circuit and the NPC valve module when operating abnormally. The reactor is used to suppress current shock and protect the NPC valve module.

[0063] like Figure 2 , which is a schematic diagram of the topological structure of the valve module, the NPC valve module includes three-phase power modules A, B, and C connected in parallel and a D-phase capacitor module.

[0064] The controller includes a polarity control panel (PCP), a valve base controller (VBC) and a valve base controller (VBE) connected in sequence, wherein the valve base controller is connected to the NPC valve module; and the polarity control panel is connected to an external host computer.

[0065] The main functions of the Polar Control Controller (PCP for short):

[0066] (11) Communicate with the host computer to receive control instructions issued by the host computer, the control instructions including control mode and corresponding target values ​​(voltage target value and power target value of the valve module) and NPC valve module unlocking instructions; and send corresponding telemetry and telesignaling information (referring to the voltage and current on the AC power supply side) to the host computer;

[0067] (12) Collecting analog quantities on the AC power supply side (analog quantities refer to voltage and current, and the values ​​collected here are the measured values ​​at the top of the voltage regulator);

[0068] (13) Generate the corresponding AC side voltage active component Ud, AC side voltage reactive component Uq, AC side current active component Id, AC side current reactive component Iq and phase-locked angle according to the voltage and current collected by itself, calculate the corresponding active and reactive power, and judge the operating status of the test loop formed by the test device by observing the active and reactive power through the host computer;

[0069] (14) Responsible for the outer loop control part, and sends the generated AC side voltage active component Ud, AC side voltage reactive component Uq, AC side current active component Id, AC side current reactive component Iq and phase-locked angle to the inner loop control (the inner loop control is the responsibility of VBC);

[0070] (15) Communicate with the valve control controller (VBC), and send the outer loop command value determined by the outer loop based on the analog quantity on the AC power supply side collected by itself, and the control command to the valve control controller (the outer loop command value includes the active component Ud of the AC side voltage, the reactive component Uq of the AC side voltage, the active component Id of the AC side current, the reactive component Iq of the AC side current, and the phase-locked angle); and also receive the status information of the corresponding NPC valve module (in the test device to which it belongs) sent by the valve control controller.

[0071] The status information of the valve module includes: the unlocking status of the NPC valve module, the molded case switch (molded case circuit breaker) status, the bypass switch status, and the AC side current and DC side voltage of the NPC valve module.

[0072] The main functions of the valve control controller (VBC for short, with multiple interfaces reserved and capable of communicating with multiple VBEs) are:

[0073] (21) communicating with the pole control controller, for receiving the outer loop command value, the control mode and the corresponding target value, and the NPC valve module unlocking command issued by the pole control controller; and sending the corresponding NPC valve module status information to the pole control controller;

[0074] (22) Responsible for the inner loop control part, calculating the modulation wave based on the outer loop command value issued by the pole control controller;

[0075] (23) Communicate with the valve base controller, send the control mode and the corresponding target value, the NPC valve module unlocking instruction and the modulation wave to the valve base controller; and receive the status information of the corresponding NPC valve module sent by the valve base controller.

[0076] Main functions of the valve base controller (VBE):

[0077] (31) connected to a valve control controller (VBC), used to receive the control mode and the corresponding target value, the NPC valve module unlocking instruction and the modulation wave sent by the valve control controller; and send the corresponding NPC valve module status information to the valve control controller;

[0078] (32) Based on the modulation wave, a trigger signal is generated according to the Space Vector Pulse Width Modulation (SVPWM) method, and the trigger signal, the control mode and the NPC valve module unlocking instruction are sent to the corresponding NPC valve module. It is also used to receive the status information of the NPC valve module sent by the corresponding NPC valve module (in the test device to which it belongs) and forward it to the valve control controller.

[0079] Among them, the information collection and transmission of the valve module, that is, the valve module is used for:

[0080] (41) communicating with a valve base controller (VBE), receiving a trigger signal, the control mode and an unlocking instruction of the NPC valve module sent by the valve base controller; and sending status information of the NPC valve module to the valve base controller;

[0081] (42) Collection of input and output quantities of molded case switches and bypass switches;

[0082] (43) Collection of DC side voltage values, including NPC valve module voltage and capacitor voltage in the NPC valve module (by Figure 2 From the topological structure of the NPC valve module, it can be known that the sum of the two capacitor voltages of the D-phase capacitor module is the NPC valve module voltage);

[0083] (44) Collection of AC side current value (NPC valve module AC side).

[0084] The performance testing system provided by the present invention is used to implement power testing and voltage testing of NPC valve modules. The performance testing platform (system) is used to perform voltage stabilization testing to verify the ability of the NPC valve module to control DC voltage, wherein two NPC valve modules are in a cascade state; and the performance testing platform is used to perform full power testing to verify the power output capacity of the NPC valve module. In the present invention, a towing experiment is used to perform full power testing to verify whether the power output of the NPC valve module is normal, and a voltage stabilization test is used to perform a voltage stabilization test, that is, the voltage of the NPC valve module is tested to achieve factory performance testing of the NPC valve module.

[0085] In this performance testing platform, two groups of test devices form a test loop through the connection between the NPC valve modules and the voltage regulator is connected to the same AC power supply; wherein the two groups of test devices form different test loops through different connection methods between the NPC valve modules, and the different test loops are used to perform different performance tests.

[0086] Among them, when using the performance test platform to carry out the drag experiment, the positive poles and negative poles of the DC sides of the two NPC valve modules in the two test devices of the test platform are connected to each other respectively, and the two voltage regulators are connected to the same AC power supply to form a test loop. At this time, the valve modules in the two test devices are at two levels of the circuit structure (test loop), and the control modes of the two-level valve modules are different. Therefore, each valve module is connected to a group of controllers (that is, each valve module is connected to the valve base controller, the valve control controller and the pole control controller in turn), and the valve modules are controlled by the connected groups of controllers respectively. The control structures of the two levels are consistent, and the two groups of controllers are connected to a host computer together, such as Figure 3 As shown, it is a control block diagram between a group of controllers and corresponding valve modules in the drag experiment, and shows the process of information transmission between the controller and the valve module. The information transmission process of each controller and valve module is the part described in the above-mentioned main functions of the controller and valve module information collection and transmission, which will not be repeated here.

[0087] After the test circuit of the towing experiment is connected, adjust the bypass switches of the two NPC valve modules in the test circuit to the open position, the molded case switch (molded case circuit breaker) to the closed position, and the AC circuit breaker to the closed position, that is, connect the test circuit, and use the control mode and its corresponding target values ​​(voltage target value and power target value of the valve module) issued by the host computer, the NPC valve module unlocking instruction, and the trigger signal of the NPC valve module generated by the analog quantity (voltage and current on the AC power supply side) in the test circuit collected by the controller itself to unlock the valve module, start and stop the valve module switch, and adjust the power value and voltage value. During the adjustment process, the host computer observes the operating status of the two levels of the test circuit to judge the power performance of the two valve modules.

[0088] When using the performance test platform to perform a voltage stabilization test, connect the positive electrode of one NPC valve module in the two test devices of the test platform to the negative electrode of another NPC valve module, and connect the two voltage regulators to the same AC power supply to form a test loop. Figure 4 As shown; at this time, the valve modules of the two test devices are in a cascade state, that is, they are at the same level of the circuit (test loop), so the valve modules of the two test devices share the same set of host computers, pole controllers and valve controllers, such as Figure 5 As shown, the valve control controller reserves multiple valve base controller interfaces for connecting two valve base controllers. Each valve base controller is connected to a valve module to achieve step-by-step control of the valve modules. The information flow transmission of each control level (host computer and controller) is the same as that of the drag experiment, that is, the main functions of each controller mentioned above and the part described in the valve module information collection and transmission are not repeated here.

[0089] After the test circuit of the voltage stabilization experiment is connected, adjust the bypass switches of the two NPC valve modules in the test circuit to the open position, the molded case circuit breaker to the closed position, and the AC circuit breaker to the closed position. Through the control mode issued by the host computer and its corresponding target values ​​(voltage target value and power target value of the valve module), the NPC valve module unlocking instruction, and the trigger signal of the NPC valve module generated by the analog quantity in the test circuit (voltage and current on the AC power supply side) collected by the controller itself, the valve module is unlocked, the valve module switch is started and stopped, and the voltage value is adjusted. During the adjustment process, the operating status in the test circuit is observed by the host computer to judge the voltage performance of the two valve modules.

[0090] During the towing experiment and the voltage stabilization test, after the control mode of the test loop is determined by the host computer, the corresponding protection parameters are also set by the host computer. That is, the performance testing platform provided by the present invention is compatible with two performance testing methods while ensuring the safety of the valve module performance test. Therefore, the performance testing platform of the present invention is safe and reliable, and has universality and compatibility, and is more cost-effective than testing devices with single functions.

[0091] Example 2

[0092] Based on the performance testing system provided above, the present invention also provides a performance testing method for an NPC valve module based on the performance testing system, such as Figure 6 As shown, including:

[0093] S1. Based on the above performance test system, connect the test loop for the performance test required for the NPC valve module; use the voltage regulator and the controller to adjust the test loop so that the test loop is in the system configuration required for the performance test.

[0094] The performance tests required for the NPC valve module include a power performance test based on a towing test.

[0095] In the towing experiment: S11, the positive electrodes and negative electrodes of the DC sides of the two NPC valve modules in the two test devices of the test platform are connected to each other respectively, and the two voltage regulators are connected to the same AC power supply to form a test circuit, such as Figure 1 As shown, the test circuit is connected by adjusting the bypass switches of the two NPC valve modules to the open position, the molded case circuit breakers to the closed position, and the AC circuit breaker to the closed position.

[0096] Among them, after completing the wiring of the positive and negative poles of the valve module, check again to ensure that the wiring is normal; after adjusting the two circuit breakers to the closed position, ensure the safety of the line.

[0097] S12. The two groups of test devices are respectively determined as the two stages of the test loop, and the controller is used to set one of the two stages as the voltage stabilizing side of the fixed DC voltage mode and the fixed reactive power mode according to the control mode sent by the upper computer, that is, the voltage stabilizing side of the stable output voltage, and the other stage is set to the power side of the fixed active power mode and the fixed reactive power, that is, the power side of the stable output power.

[0098] Among them, after setting one level to the constant DC voltage mode and the constant reactive power mode, it also includes using the host computer to set the target value of the constant DC voltage, and at the same time using the host computer to set the corresponding protection parameters. After completing the unlocking of the valve module, it also includes using the host computer to set the reactive power target value, as well as the active power and reactive power target values ​​on the voltage stabilization side. The target values ​​here are used to determine the voltage and power thresholds during the operation of the valve module, and then determine that the valve module is in normal operating state.

[0099] The NPC valve modules in the two groups of test devices are respectively connected to one group of controllers, and the two groups of controllers share one host computer.

[0100] S13, using the two-stage voltage regulator to adjust the two NPC valve modules to the rated voltage respectively, and complete the DC side voltage charging of the NPC valve module.

[0101] The voltage regulator is used to adjust the voltage output by the AC power supply to 380V, and the transformer is used to increase the 380V voltage to the rated voltage of 690V. After the valve module is adjusted to the rated voltage, the AC voltage on the valve module side corresponds to 690V. After waiting for the capacitor of the D-phase capacitor module in the valve module to be charged, the DC side voltage of each valve module is 980V, that is, the charging of the DC side voltage of the valve module is completed, and the system configuration required for the power performance test is completed.

[0102] S2. Under the system configuration, the controller is used to put the NPC valve module into operation according to the control instructions issued by the host computer; the host computer is used to monitor the operation status of the test device in the performance test system to determine the performance test result of the NPC valve module.

[0103] S21, using the controller to forward the NPC valve module unlocking instruction issued by the host computer to the NPC valve modules on the voltage stabilizing side and the power side, so that the NPC valve module is in operation; the control instruction includes a control mode and an NPC valve module unlocking instruction.

[0104] After confirming that the voltage of the valve module is normal, Figure 3 As shown, referring to the information and control instruction transmission method between the host computer and the controller, between the controllers, and between the controller and the valve module in Example 1, the controller is used to forward the NPC valve module unlocking instruction issued by the host computer to the NPC valve modules on the voltage stabilizing side and the power side, so that the NPC valve module is in operation. Specifically:

[0105] The NPC valve module unlocking instruction includes a capacitor module unlocking instruction and a power module unlocking instruction;

[0106] The controller is used to forward the unlocking instruction of the capacitor module on the voltage stabilizing side issued by the host computer to the NPC valve module on the voltage stabilizing side, so that the capacitor module of the NPC valve module on the voltage stabilizing side is in operation state, and the D-phase capacitor module on the voltage stabilizing side is observed to be in operation state through the host computer;

[0107] The controller is used to forward the unlocking instruction of the capacitor module on the power side sent by the host computer to the NPC valve module on the power side, so that the capacitor module of the NPC valve module on the power side is in operation state, and the D-phase capacitor module on the power side is observed to be in operation state through the host computer;

[0108] If the capacitor module of the NPC valve module on the voltage stabilizing side or the power side is not in operation, the NPC valve module or the test circuit is abnormal, and the experiment is stopped (after the D-phase capacitor module fails to unlock, the valve module will automatically trip and unlock. At this time, the experiment is stopped, and the power supply is disconnected to overhaul the test circuit and the valve module);

[0109] Otherwise (i.e., after the D-phase capacitor modules on the voltage stabilizing side and the power side are in operation), the controller is used to forward the unlocking instruction of the power module on the voltage stabilizing side issued by the host computer to the NPC valve module on the voltage stabilizing side, so that the power module (i.e., the A, B, and C three-phase modules) of the NPC valve module on the voltage stabilizing side is in operation, and the operation status of the power module on the voltage stabilizing side is observed through the host computer;

[0110] The controller is used to forward the unlocking instruction of the power module on the power side sent by the host computer to the NPC valve module on the power side, so that the power module of the NPC valve module on the power side is in operation state, and the operation state of the power module on the voltage stabilizing side is observed through the host computer;

[0111] If the power module of the NPC valve module on the voltage stabilizing side or the power side is not in operation, the NPC valve module or the test circuit is abnormal, the experiment is stopped, the power supply is disconnected for maintenance, otherwise it continues to run.

[0112] S22, using the host computer to observe the operating status of the two stages, if at least one stage operates abnormally, stop the experiment, otherwise gradually increase the power of the two NPC valve modules to below the rated power, and operate for a preset time period.

[0113] Among them, the power output increase is gradually set by the host computer on the power side to achieve the gradual increase of the power of the two valve modules, and reactive power or active power can be increased. In this embodiment, the preset operation time period is 10 minutes, and the operation within this time period is recorded as low-power operation. During the operation, the heat dissipation fan should be turned on to avoid over-temperature protection of the valve module and affect the experiment.

[0114] If at least one level operates abnormally within the preset time period, the experiment is stopped; otherwise, the power of the two NPC valve modules is adjusted to the rated power for a preset time period (several hours); if one level operates abnormally within the preset time period, the performance test of the NPC valve module in the abnormal level fails; otherwise, the power performance test of the NPC valve module passes.

[0115] At this stage, it is necessary to observe the temperature of the NPC valve module and the reactor. Under normal temperature conditions, after rated operation for a period of time, all devices in the entire test circuit do not trip or lock out (the circuit breaker will automatically trip if the current is abnormal), indicating that the towing test is normal and the power test of the valve module is qualified.

[0116] The operating abnormalities include: the temperature of the NPC valve module exceeds the temperature threshold, the voltage value of the NPC valve module exceeds the voltage threshold (the voltage threshold is determined based on the target value of the fixed DC voltage issued by the host computer), and at least one test device in the two levels trips and locks.

[0117] After the towing test is completed, the equipment in the entire test loop will be gradually shut down. Specifically:

[0118] After reducing the power output to 0 on the power side, the NPC valve module on the voltage stabilizing side is locked, and then the NPC valve module on the power side is also locked. The locking status of the NPC valve modules on both sides is then observed through the host computer (to ensure that the equipment is completely closed and safe); after locking the NPC valve module, the host computer sends the capacitor module locking command to the power side and the voltage stabilizing side respectively, and then the locking status of the NPC valve modules on both sides is observed through the host computer (to ensure that the equipment is completely closed and safe); then the rated voltage on the AC side is adjusted to 0 through the voltage regulator, and the circuit breaker is disconnected.

[0119] In this embodiment, the controller sets the first stage of the test loop to voltage stabilization according to the control mode sent by the host computer, thereby ensuring that the voltage in the test loop is maintained at a predetermined stable level during the power performance test, which helps to maintain a stable test environment during the test; by setting the other pole of the test loop to the power side, power regulation and control are achieved on this side, thereby more flexibly performing performance tests at different powers; by monitoring the operating status of the two stages of the test loop through the host computer, the power performance test results of the NPC valve module can be obtained.

[0120] Example 3

[0121] The present invention provides a performance testing method for an NPC valve module based on a performance testing system, such as Figure 6 As shown, including:

[0122] S1. Based on the above performance test system, connect the test loop for the performance test required for the NPC valve module; use the voltage regulator and the controller to adjust the test loop so that the test loop is in the system configuration required for the performance test.

[0123] The performance test required for the NPC valve module includes a voltage performance test based on a voltage stabilization test.

[0124] In the voltage stabilization test, S1-1, the positive electrode of one NPC valve module in the two test devices of the performance test system is connected to the negative electrode of another NPC valve module, and the two voltage regulators are connected to the same AC power supply to form a test loop, such as Figure 4 As shown, the test circuit is connected by adjusting the bypass switches of the two NPC valve modules to the open position, the molded case circuit breakers to the closed position, and the AC circuit breaker to the closed position.

[0125] Specifically, the "+" end of the DC side of NPC valve module 1 is suspended, and the "-" end is connected to the "+" end of NPC valve module 2, and the "-" end of NPC valve module 2 is suspended (or the positive and negative poles of valve modules 1 and 2 can be swapped). At this time, the two NPC valve modules are in a cascade state (NPC valve modules are cascaded and referred to as C-NPC, Cascaded Neutral Point Clamped, cascaded neutral point clamped), and are at the same pole by default. Therefore, the two NPC valve modules share the same set of the host computer, pole control controller and valve control controller. The valve control controller is connected to the two valve base controllers through a plurality of reserved valve base controller interfaces. The two valve base controllers are respectively connected to the two NPC valve modules for controlling the two NPC valve modules, such as Figure 5 shown.

[0126] After connecting the DC sides of the two adjusted NPC valve modules together, ensure that the positive and negative poles are wired correctly, and check that the primary wiring is normal. After adjusting the bypass switch, molded case circuit breaker and AC circuit breaker switch, safety protection is also required.

[0127] S1-2. Use the controller to set the test loop to a constant DC voltage mode and a constant reactive power mode according to the control mode sent by the host computer, that is, a voltage stabilization mode for stabilizing the output voltage, and set the DC voltage target value of the constant DC voltage mode.

[0128] The DC voltage target value of the fixed DC voltage mode is used to observe whether the output voltage is abnormal during the voltage stabilization test; the reactive power target value is set after the valve module is unlocked; and the corresponding protection parameters are set by the host computer. The controller sets the test loop control mode according to the control mode sent by the host computer. Figure 5 The specific information transmission refers to the main functions of the controller and the valve module information collection in Example 1, which will not be repeated here.

[0129] S1-3. Use the voltage regulators in the two groups of test devices to adjust the two NPC valve modules to the rated voltage respectively, and complete the DC side voltage charging of the NPC valve modules to complete the system configuration required for the voltage performance test.

[0130] Specifically, slowly adjust the voltage regulator to adjust the valve module to the rated voltage. At this time, the AC voltage on the valve module side corresponds to 690V. After waiting for the capacitor in the D-phase module of the valve module to be charged, the DC side voltage of each NPC valve module is about 980V (the voltage regulator is used to adjust the voltage output by the AC power supply to 380V, and use the transformer to boost the 380V voltage to a rated voltage of 690V. The rated voltage is the rated voltage of the AC side of the valve module. After the AC side is powered on, the presence of the diode in the valve module will cause the DC side to be uncontrollably rectified, and voltage will appear on the DC side. The effective value of the AC voltage multiplied by the square root of 2 is the uncontrollable rectified DC voltage value on the DC side, that is, 980V).

[0131] S2. Under the system configuration, the controller is used to put the NPC valve module into operation according to the control instructions issued by the host computer; the host computer is used to monitor the operation status of the test device in the performance test system to determine the performance test result of the NPC valve module.

[0132] S2-1. Utilize the controller to forward the NPC valve module unlocking instruction issued by the host computer to the two NPC valve modules, so that the two NPC valve modules are in operation.

[0133] After the voltage value of the NPC valve module is normal after being powered on, the controller is used to forward the capacitor module unlocking instruction issued by the host computer to the two NPC valve modules, so that the capacitor modules of the two NPC valve modules are in operation;

[0134] If the capacitor module of the NPC valve module is not in operation, the NPC valve module or the test circuit is abnormal, and the experiment is stopped (after the D-phase capacitor module fails to unlock, the valve module will automatically trip and unlock. At this time, the experiment is stopped, and the power supply is disconnected to overhaul the test circuit and the valve module);

[0135] Otherwise (i.e., after the D-phase capacitor modules of the two valve modules are in operation), the controller is used to forward the power module unlocking instruction issued by the host computer to the two NPC valve modules, so that the power modules of the NPC valve modules (i.e., the A, B, and C three-phase modules) are in operation;

[0136] If the power module of the NPC valve module is not in operation, the NPC valve module or the test circuit is abnormal, the experiment is stopped, the power is disconnected for maintenance, otherwise it continues to run.

[0137] Among them, the host computer is used to observe whether the D-phase capacitor module and the power module are in operation. Since the two NPC valve modules are cascaded and in a voltage-stabilizing state without power output, there is no need to turn on the cooling fan to avoid over-temperature protection of the NPC valve module.

[0138] S2-2, using the host computer to monitor the DC voltage of the two NPC valve modules in the test device, and obtaining the voltage performance test result of the NPC valve module according to the DC voltage. That is, using the host computer to monitor the operating status of the two NPC valve modules, if the DC voltage of the two NPC valve modules exceeds the DC voltage threshold range during operation, the voltage performance test of the NPC valve module fails, otherwise the test passes.

[0139] Among them, the use of the upper computer to observe the operating status of the two valve modules respectively refers to observing the DC voltage of the two NPC valve modules and the DC side output voltage after cascading, and the DC side output voltage is equal to the DC voltage sum of the two NPC valve modules; the DC voltage threshold range is determined based on the DC voltage target value.

[0140] After the cascade voltage stabilization test is completed, the power modules of the two NPC valve modules are locked; after locking the power modules of the NPC valve modules, the upper computer is used to send the capacitor module locking command, and then the locking status of the NPC valve modules on both sides is observed through the upper computer to ensure that the equipment is completely closed and safe; then the rated voltage on the AC side is adjusted to 0 through the voltage regulator, and the circuit breaker is disconnected.

[0141] In this embodiment, the controller sets the test loop to the voltage stabilization mode according to the control mode sent by the host computer, thereby ensuring that the voltage in the test loop remains at a stable level during the voltage stabilization test, which helps to maintain a stable test environment during the test; the DC voltage of the NPC valve module is monitored by the host computer to obtain the voltage performance test results of the NPC valve module. According to the above-mentioned towing experiment, the full power test of the NPC valve module is implemented, and according to the voltage stabilization test in this embodiment, the voltage stabilization test of the NPC valve module is implemented. No additional equipment is required, and both tests can be implemented under normal conditions by changing the connection method of the test platform. It has universality and compatibility, and is cost-effective.

[0142] Example 4

[0143] like Figure 7 As shown, the present invention also provides an electronic device, which may be a computer device, a single-chip device, an intelligent mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, the processor, and the transceiver component are connected via a bus; the memory may be used to store an execution program, and an exemplary execution program may include instructions; the processor is used to execute the instructions stored in the memory. The memory may also be used to store data, which may be called and / or modified when the instructions are executed.

[0144] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in a storage medium to implement corresponding method flows or corresponding functions, so as to implement the steps of a performance testing method for an NPC valve module based on a performance testing system in the above-mentioned embodiment.

[0145] Example 5

[0146] Based on the same inventive concept, the present invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory), which is a memory device in the electronic device for storing programs and data. It can be understood that the storage medium here can include both the built-in storage medium in the electronic device and the extended storage medium supported by the electronic device. The storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more execution programs (including program codes). It should be noted that the storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor loads and executes one or more instructions stored in the storage medium, which can implement the steps of a performance testing method for an NPC valve module based on a performance testing system in the above embodiment.

[0147] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0148] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0149] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0150] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. A performance test system for an NPC valve module, characterized in that: include: Two groups of test devices with the same configuration; each group of the test devices comprises a voltage regulator, an AC circuit breaker, a transformer, a molded case circuit breaker, a reactor and an NPC valve module connected in series in sequence, and a controller connected to the NPC valve module for controlling the NPC valve module; The two groups of test devices are connected through the NPC valve modules, and the voltage regulators of the two groups of test devices are connected to the same AC power supply to form a test loop; wherein the two groups of test devices form different test loops through different connection modes between the two NPC valve modules, and the different test loops are used to perform different performance tests; The controller is used to issue control instructions to the NPC valve module in the test device to which it belongs to perform corresponding performance tests for each performance test; and determine the performance test result of the NPC valve module according to the operating state of the test device in the performance test.

2. The test system according to claim 1, characterized in that: The controller comprises a pole control controller, a valve control controller and a valve base controller which are connected in sequence, wherein the valve base controller is connected to the NPC valve module; the pole control controller is connected to an external host computer; The valve control controller is used to receive the control instructions sent by the host computer, the control instructions include the control mode and the NPC valve module unlocking instruction; and determine the outer loop instruction value based on the analog quantity collected on the AC power supply side, and send the outer loop instruction value, the control mode and the NPC valve module unlocking instruction to the valve control controller; and is also used to receive the status information of the NPC valve module in the test device to which it belongs sent by the valve control controller; The valve control controller is used to receive the outer loop command value, the control mode and the NPC valve module unlocking command; and calculate the modulation wave based on the outer loop command value; Sending the control mode, the NPC valve module unlocking instruction and the modulation wave to the valve base controller; and receiving the status information of the NPC valve module in the test device to which it belongs sent by the valve base controller, and forwarding the status information to the pole control controller; The valve base controller is used to receive the control mode, the NPC valve module unlocking instruction and the modulation wave; generate a trigger signal based on the modulation wave; and send the trigger signal, the control mode and the NPC valve module unlocking instruction to the NPC valve module in the test device to which it belongs; Receive status information sent by the NPC valve module in the test device to which it belongs, and forward the status information to the valve control controller.

3. The test system according to claim 2, characterized in that: The state information includes the unlocking state of the NPC valve module, the molded case switch state, the bypass switch state, and the AC side current and DC side voltage of the NPC valve module.

4. The test system according to claim 1, characterized in that: The NPC valve module includes three-phase power modules A, B, and C and a D-phase capacitor module connected in parallel.

5. A performance testing method for an NPC valve module based on a performance testing system, characterized in that: include: Based on the performance test system described in any one of claims 1 to 4 above, a test loop is connected for the performance test required for the NPC valve module; the test loop is adjusted by a pressure regulator and a controller so that the test loop is in the system configuration required for the performance test; Under the system configuration, the controller is used to put the NPC valve module into operation according to the control instructions issued by the host computer; the host computer is used to monitor the operation status of the test device in the performance test system to determine the performance test result of the NPC valve module.

6. The method according to claim 5, characterized in that The performance tests required for the NPC valve module include a power performance test based on a towing test; The performance test required for the NPC valve module connects a test loop; and uses a pressure regulator and a controller to adjust the test loop so that the test loop is in a system configuration required for the performance test, including: In the pair-drag experiment, the positive electrodes and negative electrodes of the DC sides of the two NPC valve modules in the two groups of test devices of the performance test system are connected to each other respectively, and the two voltage regulators are connected to the same AC power supply to form a test loop, and the test loop is connected; The two groups of test devices are respectively determined as the two stages of the test loop, and one stage is set as the voltage stabilizing side of the stable output voltage and the other stage is set as the power side of the stable output power by using a controller according to the control mode sent by the upper computer; The two-stage voltage regulator is used to adjust the two NPC valve modules to the rated voltage respectively, so as to complete the DC side voltage charging of the two NPC valve modules and complete the system configuration required for the power performance test.

7. The method according to claim 6, characterized in that The method of using the controller to put the NPC valve module into operation according to the control instruction issued by the host computer; and using the host computer to monitor the operation state of the test device in the performance test system to determine the performance test result of the NPC valve module includes: The controller is used to send an NPC valve module unlocking instruction to the NPC valve module on the voltage stabilizing side and the NPC valve module on the power side, so that the NPC valve module is in operation; the control instruction includes a control mode and an NPC valve module unlocking instruction; Using the host computer to adjust the power of the two NPC valve modules on the power side; and using the host computer to monitor the operating state of the test device at different powers, and obtaining the power performance test result of the NPC valve module according to the operating state; The two NPC valve modules are respectively connected to a group of controllers, and the two groups of controllers share one host computer.

8. The method according to claim 7, characterized in that The method of using the host computer to adjust the power of the two NPC valve modules on the power side; and using the host computer to monitor the operating state of the test device at different powers, and obtaining the performance test results of the NPC valve module according to the operating state, includes: Using the host computer to gradually increase the power of the two NPC valve modules on the power side to below the rated power, and running for a preset time period; If the NPC valve module on the voltage stabilizing side and at least one stage of the power side operate abnormally within the time period, the experiment is stopped; If both the voltage stabilizing side and the power side operate normally within the time period, the power of the two NPC valve modules is adjusted to the rated power for a preset time period; if one stage operates abnormally, the power performance test of the NPC valve module in the abnormally operating stage is determined to be unqualified; otherwise, the power performance test of the NPC valve module is determined to be qualified; The operation abnormality includes: the temperature of the NPC valve module exceeds the temperature threshold, the voltage value of the NPC valve module exceeds the voltage threshold, and the test device trips and locks.

9. The method according to claim 6, characterized in that The performance test required for the NPC valve module includes a voltage performance test based on a voltage stabilization test; The performance test required for the NPC valve module connects a test loop; and uses a pressure regulator and a controller to adjust the test loop so that the test loop is in a system configuration required for the performance test, including: In the voltage stabilization experiment, the positive electrode of one NPC valve module in the two test devices of the performance test system is connected to the negative electrode of the other NPC valve module, and the two voltage regulators are connected to the same AC power supply to form a test loop, and the test loop is connected; Using a controller to set the test circuit to a voltage stabilization mode for stabilizing the output voltage according to a control mode sent by a host computer; The two voltage regulators are used to adjust the two NPC valve modules to the rated voltage respectively, and the DC side voltage of the NPC valve modules is charged, thereby completing the system configuration required for the voltage performance test.

10. The method according to claim 9, characterized in that Using the controller to put the NPC valve module into operation according to the control instruction issued by the host computer; using the host computer to monitor the operation state of the test device in the performance test system to determine the performance test result of the NPC valve module, including: Using the controller to issue an NPC valve module unlocking instruction to the two NPC valve modules, so that the two NPC valve modules are in operation state; Using the host computer to monitor the DC voltage of two NPC valve modules in the test device, and obtaining the voltage performance test result of the NPC valve module according to the DC voltage; Among them, the two NPC valve modules share the same set of the host computer, pole control controller and valve control controller, the valve control controller is connected to the two valve base controllers through a plurality of reserved valve base controller interfaces, and the two valve base controllers are respectively connected to the two NPC valve modules for controlling the two NPC valve modules.

Images