Current flow test method and test circuit for power module engineering on-site operation conditions

Abstract

The present invention relates to a flow test method, test circuit, and equipment for power module engineering site operating conditions. The method includes obtaining the location of power module failure in a flexible direct current converter valve, constructing a minimum test system based on the location of power module failure and the test circuit; using simulation software to simulate the minimum test system and performing a flow test on the minimum test system according to the operating conditions of the power module application engineering site, obtaining the port voltage of the test power module and the flow current of the minimum test system; and determining the port impedance of the test power module based on the port voltage and flow current. The method simulates the minimum test system according to the operating conditions of the power module application engineering site to perform a flow test on the test power module, thereby obtaining the port impedance of the test power module. This method can more accurately evaluate the port impedance of the failed power module and avoid the problem of inaccurate results caused by the uncertainty brought about by the use of traditional direct measurement methods.

Description

Technical Field

[0001] The present invention relates to the technical field of power modules, and in particular to a flow-through testing method, a test circuit and equipment for on-site operation conditions of a power module project. Background Art

[0002] Power modules are key components of flexible DC converter valves, enabling efficient conversion, control, and transmission of electrical energy. They are widely used in HVDC transmission. Due to the structural characteristics of flexible DC converter valves, a single power module failure should not cause the power system to trip or shut down. Therefore, the designed power modules must maintain long-term flow capacity under extreme operating conditions. Even if the bypass switch fails, a backup flow path is available. Power semiconductor devices are typically used as this backup long-term flow path.

[0003] Existing methods for providing a long-term backup current path for power modules include: leveraging the inherent short-circuit characteristics of the power module's IGBTs; and adding additional bypass thyristors. Both methods utilize overvoltage breakdown of the power device to achieve a long-term, reliable current path. To verify that the low impedance characteristics of the power module port after power device breakdown ensure long-term reliable operation with the power system current, it is necessary to conduct impedance testing of the power module port to ensure current flow capacity.

[0004] Currently, there are two methods for measuring the port impedance of power modules: direct measurement and indirect measurement. The direct measurement method uses a milliohm meter (micro-impedance tester) to measure the output port impedance of the power module. The indirect measurement method uses the measured port voltage and current to indirectly calculate the power module port impedance based on the ratio of the voltage to the effective current. However, the direct measurement method is more accurate for testing purely resistive devices. For the short-circuit failure mode of power semiconductor devices after breakdown, since the semiconductor characteristics are different from those of purely resistive devices and the impedance is temperature-related, the direct measurement method may result in large differences in the measured values, such as low resistance after breakdown and high resistance after standing. Summary of the Invention

[0005] The embodiments of the present invention provide a current flow test method, test circuit and equipment for on-site operation conditions of a power module project, which are applied to the test circuit for on-site operation conditions of a power module project to solve the technical problem that the existing results of power module port impedance measurement have large differences.

[0006] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A method for testing a flow rate under on-site operating conditions of a power module project is provided, which is applied to a test circuit under on-site operating conditions of a power module project. The method for testing a flow rate under on-site operating conditions of a power module project comprises the following steps:

[0008] Obtaining a failure location of a power module in a flexible DC converter valve, and constructing a minimum test system based on the failure location of the power module and the test loop, wherein the minimum test system includes a test power module and a companion test module;

[0009] Performing simulation on the minimum test system using simulation software and conducting a through-current test on the minimum test system according to the operating conditions of the power module application project site to obtain the port voltage of the test power module and the through-current of the minimum test system;

[0010] The port impedance of the test power module is determined according to the port voltage and the flow current.

[0011] Preferably, the current flow test method for the power module engineering site operation condition includes: if the value of the port impedance is lower, the current flow capacity of the power module will last longer.

[0012] Preferably, determining the port impedance of the test power module according to the port voltage and the flow current includes: taking a ratio of the port voltage to the flow current as the port impedance of the test power module.

[0013] Preferably, constructing a minimum test system based on the location of power module failure and the test loop includes:

[0014] Determine, according to the test loop, a first accompanying test module and a second accompanying test module with different numbers of accompanying test valve sections;

[0015] Based on the location of power module failure, the test power module is connected in series with the first accompanying test module and then connected in parallel with the second accompanying test module to construct a minimum test system; or based on the location of power module failure, the test power module is connected in series with the second accompanying test module and then connected in parallel with the first accompanying test module to construct a minimum test system.

[0016] Preferably, the process of simulating the minimum test system using simulation software and conducting a flow test on the minimum test system according to the operating conditions of the power module application engineering site includes: controlling the test valve section pulses of the first test module and the second test module, and controlling the corresponding test power module to operate in rectification mode or inverter mode to make the minimum test system consistent with the operating conditions of the power module application engineering site.

[0017] Preferably, the process of simulating the minimum test system using simulation software and conducting a current flow test on the minimum test system according to the operating conditions of the power module application engineering site includes: obtaining the port voltage of the test power module by measuring through a high-voltage voltage divider resistor; and obtaining the current flow of the minimum test system by measuring through a Hall effect current sensor.

[0018] The present invention also provides a test circuit for the on-site operation conditions of a power module project, comprising a test power module, a first accompanying test module, a second accompanying test module and a test control module; the first accompanying test module and the second accompanying test module are both provided with accompanying test valve sections corresponding to the valve sections in the power module, the number of accompanying test valve sections of the first accompanying test module is different from the number of accompanying test valve sections of the second accompanying test module, the first accompanying test module is connected in series with the test power module and then in parallel with the second accompanying test module, and the test control module controls the operation of the test power module, the first accompanying test module and the second accompanying test module according to the above-mentioned flow test method for the on-site operation conditions of the power module project to test the long-term flow capacity of the test power module.

[0019] Preferably, the number of the accompanying test valve sections of the first accompanying test module is an odd number, and the number of the accompanying test valve sections of the second accompanying test module is an even number.

[0020] Preferably, the test circuit of the power module engineering site operation condition includes: an energy compensation power supply and a load reactance, the energy compensation power supply is connected to the input end of the first accompanying test module, the output end of the first accompanying test module is connected in series with the test power module, and the test power module is connected to the load reactance after being connected in parallel with the second accompanying test module.

[0021] The present invention also provides a terminal device, comprising a processor and a memory;

[0022] The memory is used to store program code and transmit the program code to the processor;

[0023] The processor is used to execute the above-mentioned current flow test method for the power module engineering field operation condition according to the instructions in the program code.

[0024] As can be seen from the above technical solutions, the embodiments of the present invention have the following advantages: the flow test method, test circuit, and equipment for the on-site operation conditions of a power module project are applied to the test circuit for the on-site operation conditions of the power module project. The flow test method includes obtaining the location of the power module failure in the flexible DC converter valve, constructing a minimum test system based on the location of the power module failure and the test circuit; using simulation software to simulate the minimum test system and conducting a flow test on the minimum test system according to the operating conditions of the power module application project site, obtaining the port voltage of the test power module and the flow current of the minimum test system; and determining the port impedance of the test power module according to the port voltage and flow current. The flow test method for the on-site operation conditions of the power module project implements the flow test on the test power module by constructing a minimum test system according to the operating conditions of the power module application project site, indirectly measuring the port impedance of the test power module, and can more accurately evaluate the port impedance of the failed power module, avoid the uncertainty caused by the traditional direct measurement method due to temperature influence, avoid the problem of inaccurate measurement results, and solve the technical problem that the existing results of power module port impedance measurement have large differences. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a flowchart of the steps of the current flow test method for the power module engineering field operation condition according to an embodiment of the present invention;

[0027] Figure 2 Schematic diagram of the framework of the minimum test system in the current flow test method for power module engineering on-site operation conditions according to an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of a test circuit for on-site operation of a power module according to an embodiment of the present invention;

[0029] Figure 4 This is a simulation diagram of the minimum test system for the current flow test method of the power module engineering field operation conditions described in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] The present invention provides a method, test circuit, and apparatus for testing the flow of current under on-site power module operation conditions. These methods, test circuits, and apparatus are applied to test circuits for on-site power module operation conditions to address the technical issue of significant variability in the results of existing power module port impedance measurements. The method, test circuit, and apparatus for testing the flow of current under on-site power module operation conditions utilize the flow of current at an equivalent on-site power module failure as an example.

[0032] Example 1:

[0033] Figure 1 This is a flow chart of the steps of the current flow test method for the power module engineering field operation condition according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the framework of the minimum test system in the current flow test method for power module engineering on-site operation conditions according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the framework of a test circuit for on-site operation conditions of a power module project according to an embodiment of the present invention.

[0034] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a current flow test method for a power module project on-site operating condition, which is applied to a test circuit for a power module project on-site operating condition. The current flow test method for a power module project on-site operating condition includes the following steps:

[0035] S1. Obtain the failure location of the power module in the flexible DC converter valve, and construct a minimum test system based on the failure location of the power module and the test loop. The minimum test system includes a test power module and a companion test module.

[0036] It should be noted that the constructed minimum test system meets the operating conditions of the power module engineering site. The minimum test system has complete protection logic and can simulate the same operating conditions of the power module at the power engineering site. In this embodiment, the test power module can be placed at any position in the minimum test system based on the location of the power module failure; it can also be placed in the same position as the power module at the power engineering site, and the failed power module may be at any position of the power module bridge arm of the converter valve; it can be understood that since the power device inside the test power module is in a failed short-circuit state, in principle, from the perspective of external port characteristics, the test power module is equivalent to a low-impedance wire, so the test power module can be connected in series at any position in the minimum test system. Therefore, there is no requirement for the placement of the test power module, and it can be placed at any position in the test loop. Among them, the test power module can be arranged in the middle of any test valve section of the first test module or the second test module. Since the port of the test power module is short-circuited, the port basically has no voltage to build a level output, so that the constructed minimum test system presents asymmetry at both ends, which can simulate the asymmetry of the power modules in different bridge arms due to different bypass numbers in power engineering applications. A stable system current can be built by switching different numbers of power modules.

[0037] Furthermore, a minimum test system is constructed based on the power module failure location and test circuit, including:

[0038] Determine a first accompanying test module and a second accompanying test module with different numbers of accompanying test valve sections according to the test circuit;

[0039] Based on the location of power module failure, the test power module is connected in series with the first accompanying test module and then in parallel with the second accompanying test module to construct a minimum test system; or based on the location of power module failure, the test power module is connected in series with the second accompanying test module and then in parallel with the first accompanying test module to construct a minimum test system.

[0040] It should be noted that the test power module can be arranged at any position of the test valve section of the first test module or the second test module. Figure 3As shown, the test power module is connected in series to the output end of the first accompanying test module or the second accompanying test module. A minimum test system corresponding to the power engineering site where the power module is applied is established. If a failed power module appears in a bridge arm of the power engineering site where the power module is applied, it will inevitably lead to inconsistent numbers of available modules between different bridge arms in the power module. Therefore, the flow test method for the operating conditions of the power module engineering site constructs a minimum test system under the condition of asymmetric test valve sections. For example, if the test power module is arranged in the first accompanying test module, the number of test valve sections of the first accompanying test module is 5, and the number of test valve sections of the second accompanying test module is 6. This allows the minimum test system to ensure the stable operation of the first and second accompanying test modules, and also controls the test power module to operate in rectification mode, inverter mode, or reactive mode, so that the current output by the minimum test system is consistent with the current component output by the power engineering site where the power module is applied.

[0041] S2. Simulate the minimum test system using simulation software and perform a through-current test on the minimum test system according to the operating conditions of the power module application project site to obtain the port voltage of the test power module and the through-current of the minimum test system.

[0042] It should be noted that in step S2, the PSCAD simulation software is used to simulate the minimum test system, which enables the minimum test system to achieve asymmetric operating conditions and stably control the system current of the minimum test system. In this embodiment, the PSCAD simulation software can be used to simulate various operating conditions of power modules applied in power engineering sites to ensure the controllable and stable operation of the minimum test system. It is also possible to simulate an extreme impedance change condition so that the minimum test system can achieve transient fault crossing when the impedance transient change of the failed power module is unstable, stably control the system current of the minimum test system, and achieve controllable stability of the minimum test system. Among them, the operating conditions of the power module application engineering site include steady-state operating conditions and extreme impedance change conditions.

[0043] Furthermore, the process of simulating the minimum test system using simulation software and conducting a flow test on the minimum test system according to the operating conditions of the power module application engineering site includes: controlling the test valve section pulses of the first test module and the second test module, and controlling the corresponding test power module to operate in rectification mode or inverter mode to make the minimum test system consistent with the operating conditions of the power module application engineering site.

[0044] It should be noted that, according to the minimum test system, simulation software is used to simulate and simulate the minimum test system according to the operating conditions of the power module application project site, and the flow test of the minimum test system is carried out according to the operating parameters of the operating conditions of the power module application project site. The operation of the minimum test system can be simulated by PSCAD simulation software, so that the system current change of the minimum test system is basically the same as the operating conditions of the power module application project site, and the measurement points can be arranged safely and reasonably, and the port voltage of the test product power module and the flow current of the minimum test system can be monitored in real time. In this embodiment, the operating parameters include power module (normal test) voltage, switching frequency, system current (each component remains consistent), etc. The system current includes power frequency component current, double frequency component current, etc. The control of the minimum test system includes circulation control, and the test valve section where the test product power module is located can work in rectification or inversion mode, and the normal power module voltage and switching frequency are adjustable.

[0045] Furthermore, the minimum test system is simulated using simulation software and the current flow test of the minimum test system is performed according to the operating conditions of the power module application project site, including: obtaining the port voltage of the test power module through high-voltage voltage divider resistor measurement; and obtaining the current flow of the minimum test system through Hall effect current sensor measurement.

[0046] Figure 4 This is a simulation diagram of the minimum test system for the current flow test method of the power module engineering field operation conditions described in an embodiment of the present invention.

[0047] It should be noted that if Figure 3 As shown, the flow current of the minimum test system can be measured by the Hall effect current sensor; the port voltage of the test power module can be measured by the high-voltage voltage divider resistor. Whether the Hall effect current sensor is arranged on the high-potential side or the low-potential side of the minimum test system, it will not affect the measurement of electrical quantities. In this embodiment, after the PSCAD simulation software starts the simulation of the minimum test system, the test power module is subjected to long-term current flow, and the port voltage of the test power module is collected through the high-voltage voltage divider resistor. Since the test power module is connected in series in the accompanying test valve section, there is alternating high voltage at the two ports of the test power module, and a high-precision, high-resistance voltage divider resistor is required to test its port voltage. At the same time, due to the control needs of the minimum test system, the current of the load needs to be collected in real time. The flow current of the minimum test current is collected by the Hall effect current sensor, and the measurement point of the flow current of the minimum test current can be shared with the current of the minimum test system, as shown below. Figure 4 The voltage and current of the side face are shown.

[0048] In the embodiment of the present invention, the constructed minimum test system is different from the control strategy, control object, and control quantity of the power module application engineering site. The current-through test method of the operating conditions of the power module engineering site needs to use simulation software to simulate the minimum test system to ensure the output current of the minimum test system under the operating conditions of any power module application engineering site, so that the minimum test system has a complete protection logic. Once an abnormality occurs, the minimum test system can be protected in time and the fault will not be further expanded; the minimum test system can achieve a current component configuration consistent with the power module application engineering site, can control the working mode of the minimum test system, and can switch between rectification mode or inverter mode. At the same time, the voltage and switching frequency of the test power module are controllable and can approach the operating conditions of the power module application engineering site.

[0049] S3. Determine the port impedance of the test power module based on the port voltage and the flow current. The ratio of the port voltage to the flow current is used as the port impedance of the test power module.

[0050] It should be noted that in step S3, since the bridge arm current of the flexible DC project is an AC current with a DC bias, the port voltage corresponding to the test power module is also an AC voltage. During the current flow of the test power module, the effective values ​​of the voltage and current at the measuring points need to be collected in real time, and division operations need to be performed to indirectly obtain the port impedance of the test power module.

[0051] The present invention provides a flow test method for a power module project site operating condition, which is applied to a test loop for the power module project site operating condition. The flow test method includes obtaining the location of a power module failure in a flexible DC converter valve, constructing a minimum test system based on the location of the power module failure and the test loop; using simulation software to simulate the minimum test system and conducting a flow test on the minimum test system according to the operating conditions of the power module application project site, obtaining the port voltage of the test power module and the flow current of the minimum test system; and determining the port impedance of the test power module according to the port voltage and the flow current. The flow test method for a power module project site operating condition implements a flow test on the test power module by constructing a minimum test system according to the operating conditions of the power module application project site, indirectly measuring the port impedance of the test power module, and can more accurately evaluate the port impedance of the failed power module. It can avoid the uncertainty caused by the traditional direct measurement method due to temperature influence, avoid the problem of inaccurate measurement results, and solve the technical problem that the results of existing power module port impedance measurement have large differences.

[0052] It should be noted that the flow test method for the on-site operation conditions of the power module project uses the failed power module as the object of the flow test, which can fully simulate the long-term flow operation conditions of the failed power module in the converter valve at the power module application project site. The constructed minimum test system can indirectly test the port impedance of the power module without disassembling the power module and without destroying the integrity of the power module. It overcomes the shortcomings of the traditional direct measurement method and is feasible. The minimum test system constructed by the flow test method for the on-site operation conditions of the power module project is applicable to power modules of different topologies. It can not only measure the long-term flow conditions of half-bridge power modules, but also evaluate the flow conditions of full-bridge power modules. Among them, it can be a minimum test system built for half-bridge power modules, a minimum test system built for full-bridge power modules, or a minimum test system built for a mixture of full and half-bridge power modules, and the mixing ratio can be arbitrarily configured.

[0053] In one embodiment of the present invention, the current flow test method of the power module engineering field operation condition includes: if the value of the port impedance is lower, the current flow capacity of the power module is longer.

[0054] It should be noted that port impedance = port voltage / current. A lower port impedance indicates a short-circuit failure of the power module, which reduces the temperature rise during current flow and allows for long-term current flow.

[0055] Example 2:

[0056] like Figure 3 As shown, an embodiment of the present invention further provides a test circuit for a power module engineering site operation condition, comprising a test power module 10, a first accompanying test module 20, a second accompanying test module 30 and a test control module; the first accompanying test module 20 and the second accompanying test module 30 are both provided with accompanying test valve sections corresponding to the valve sections in the power module, the number of accompanying test valve sections of the first accompanying test module 20 is different from the number of accompanying test valve sections of the second accompanying test module 30, the first accompanying test module 20 is connected in series with the test power module 10 and then connected in parallel with the second accompanying test module 30, the test control module controls the operation of the test power module 10, the first accompanying test module 20 and the second accompanying test module 30 according to the flow test method for the power module engineering site operation condition described above, so as to test the long-term flow capacity of the test power module 10.

[0057] It should be noted that the content of the current-through test method for the on-site operating conditions of the power module project in Example 2 has been explained in Example 1. The content of the current-through test method for the on-site operating conditions of the power module project has been explained in detail in Example 1. In this Example 2, the content of the current-through test method for the on-site operating conditions of the power module project will no longer be explained in detail.

[0058] In the embodiment of the present application, the number of the accompanying test valve sections of the first accompanying test module 20 is an odd number, and the number of the accompanying test valve sections of the second accompanying test module 30 is an even number.

[0059] It should be noted that the test power module 10 can be connected in series in a test module in the form of a variable resistor to form a minimum test system with another test module. The number of test valve sections of the first test module 20 can be 5, and the number of test valve sections of the second test module 30 can be 6. The minimum test system is simulated by simulation software to achieve stable system operation, and at the same time, the various electrical parameters of the minimum test system can be controlled to meet the operating conditions of the power module application project site.

[0060] like Figure 3 As shown, in an embodiment of the present application, the test circuit of the power module engineering field operation condition includes: a power supply 40 and a load reactance L3, the power supply 40 is connected to the input end of the first accompanying test module 20, the output end of the first accompanying test module 20 is connected in series with the test power module 10, and the test power module 10 is connected in parallel with the second accompanying test module 30 and then connected to the load reactance L3.

[0061] It should be noted that the test circuit for the on-site operating conditions of the power module project is a test circuit that is consistent with the system current at the power module application project site. The failed power module is connected in series in the test circuit as a test power module for current to flow. By measuring the port voltage of the test power module and the effective value of the system current of the minimum test system, the port impedance of the failed power module is indirectly obtained to verify the long-term current-carrying capacity of the power module. At the same time, the port impedance of the failed power module is obtained more accurately to evaluate the current-carrying condition of such failed power modules.

[0062] In an embodiment of the present invention, the test circuit of the power module engineering site operation condition adjusts the output voltage of the energy supply through the test control module to meet the test voltage requirements of the minimum test system; unlocks the accompanying test valve section, adjusts the modulation signals of the first accompanying test module 20 and the second accompanying test module 30, so that a circulation is generated between the accompanying test valve sections, so that all power modules in the test circuit are voltage-equalized and stabilized around the voltage rated value of the power module, adjusts the control quantity set value, so that the current of the accompanying test valve section rises to the test set value, including the current DC component, fundamental frequency component and double frequency component can be tracked and set respectively, and the various components of the current and the voltage are adjusted to meet the operating conditions of the power module application engineering site.

[0063] Example 3:

[0064] An embodiment of the present invention provides a terminal device, including a processor and a memory;

[0065] A memory, configured to store program codes and transmit the program codes to a processor;

[0066] The processor is used to execute the above-mentioned current flow test method for the power module engineering field operation condition according to the instructions in the program code.

[0067] It should be noted that the processor is configured to execute the steps of the embodiment of the current flow test method for a power module engineering field operation condition according to the instructions in the program code. Alternatively, the processor implements the functions of the modules / units in the above-mentioned system / device embodiments when executing the computer program.

[0068] For example, a computer program may be divided into one or more modules / units, one or more of which are stored in a memory and executed by a processor to complete the present application. One or more modules / units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program in a terminal device.

[0069] Terminal devices can be computing devices such as desktop computers, laptops, PDAs, and cloud servers. Terminal devices may include, but are not limited to, processors and memory. Those skilled in the art will appreciate that this does not constitute a limitation on terminal devices and may include more or fewer components than shown, or a combination of certain components, or different components. For example, terminal devices may also include input / output devices, network access devices, buses, and the like.

[0070] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0071] The memory can be an internal storage unit of a terminal device, such as a hard drive or memory. It can also be an external storage device, such as a plug-in hard drive, a SmartMedia Card (SMC), a Secure Digital (SD) card, or a flash memory card. Furthermore, the memory can include both the internal storage unit and external storage devices of the terminal device. The memory is used to store computer programs and other programs and data required by the terminal device. The memory can also be used to temporarily store data that has been output or is about to be output.

[0072] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0073] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0074] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0075] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0076] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0077] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A current flow test method for power module engineering on-site operating conditions, applied to a test circuit for power module engineering on-site operating conditions, characterized in that: The flow test method includes the following steps: Obtaining a failure location of a power module in a flexible DC converter valve, and constructing a minimum test system based on the failure location of the power module and the test loop, wherein the minimum test system includes a test power module and a companion test module; Performing simulation on the minimum test system using simulation software and conducting a through-current test on the minimum test system according to the operating conditions of the power module application project site to obtain the port voltage of the test power module and the through-current of the minimum test system; Determine the port impedance of the test power module according to the port voltage and the flow current; The minimum test system based on the location of the power module failure and the test loop includes: Determine, according to the test loop, a first accompanying test module and a second accompanying test module with different numbers of accompanying test valve sections; Based on the position of power module failure, the test power module is connected in series with the first accompanying test module and then connected in parallel with the second accompanying test module to construct a minimum test system; or based on the position of power module failure, the test power module is connected in series with the second accompanying test module and then connected in parallel with the first accompanying test module to construct a minimum test system; The process of simulating the minimum test system using simulation software and conducting a flow test on the minimum test system according to the operating conditions of the power module application engineering site includes: controlling the test valve section pulses of the first test module and the second test module, and controlling the corresponding test power module to operate in rectification mode or inverter mode to make the minimum test system consistent with the operating conditions of the power module application engineering site.

2. The current flow test method for power module engineering on-site operation conditions according to claim 1 is characterized in that: include: The lower the value of the port impedance is, the longer the current-carrying capacity of the power module will be.

3. The current flow test method for power module engineering on-site operation conditions according to claim 1, characterized in that: Determining the port impedance of the test power module according to the port voltage and the flow current includes: taking a calculated ratio of the port voltage to the flow current as the port impedance of the test power module.

4. The current flow test method for power module engineering on-site operation conditions according to claim 1, characterized in that: The process of simulating the minimum test system using simulation software and conducting a current flow test on the minimum test system according to the operating conditions of the power module application project site includes: obtaining the port voltage of the test power module through high-voltage voltage divider resistor measurement; and obtaining the current flow of the minimum test system through Hall effect current sensor measurement.

5. A test circuit for on-site operation of a power module project, characterized in that: It includes a test power module, a first accompanying test module, a second accompanying test module and a test control module; the first accompanying test module and the second accompanying test module are both provided with an accompanying test valve section corresponding to the valve section in the power module, the number of accompanying test valve sections of the first accompanying test module is different from the number of accompanying test valve sections of the second accompanying test module, the first accompanying test module is connected in series with the test power module and then connected in parallel with the second accompanying test module, and the test control module controls the operation of the test power module, the first accompanying test module and the second accompanying test module according to the flow test method for the power module engineering site operation condition as described in any one of claims 1-4 to test the long-term flow capacity of the test power module.

6. The test circuit for power module engineering on-site operation conditions according to claim 5, characterized in that: If the number of the accompanying test valve sections of the first accompanying test module is an odd number, then the number of the accompanying test valve sections of the second accompanying test module is an even number.

7. The test circuit for power module engineering on-site operation conditions according to claim 5, characterized in that: include: A power supply and a load inductor, wherein the power supply is connected to the input end of the first accompanying test module, the output end of the first accompanying test module is connected in series with the test power module, and the test power module is connected to the load inductor after being connected in parallel with the second accompanying test module.

8. A terminal device, characterized in that: including a processor and a memory; The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the current flow test method for the power module engineering field operation condition as described in any one of claims 1 to 4 according to the instructions in the program code.

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