A frequency converter testing system

Abstract

The application discloses a frequency converter testing system, which comprises a power module, a transformer module, an accompanying testing component, a tested work station module, a motor module and a mobile accompanying testing module; the transformer module is electrically connected with the power module through a circuit switching module; the accompanying testing component is electrically connected with the transformer module through the circuit switching module; the tested work station is electrically connected with the transformer module through the circuit switching module, and the tested work station module is used for pre-connecting a tested frequency converter; one end of the motor module is electrically connected with the tested work station module through the circuit switching module, and the other end of the motor module is electrically connected with the accompanying testing component. The modules in the application are connected with each other through the circuit switching module, the equipment can be increased or decreased according to the testing requirement, the equipment is reduced, the occupied area is reduced, the connection between the equipment is reduced, and meanwhile, the function of system testing is increased.

Description

Technical Field

[0001] The embodiments of this application relate to the field of equipment testing technology, and in particular to a frequency converter testing system. Background Technology

[0002] As a power conversion device, frequency converters are widely used in various fields. In the marine industry, frequency converters are used in numerous applications, including combined propulsion, pure electric motor propulsion, power generation and grid connection, and energy storage control. They not only affect the operating performance of the propulsion motor but also directly determine the reliability, flexibility, and lifespan of the marine power grid. Therefore, frequency converters must undergo thorough performance testing before leaving the factory and must meet various application condition tests.

[0003] Existing technology discloses a comprehensive test platform for high-power converters, including a main unit and a slave unit of the converter under test. The test platform includes a grid-side branch, a low-power grid-connected operation branch, an aging test branch, a parallel-drive test branch, a motor-side branch, and a power control branch. This invention uses a large number of transformers, resulting in high cost and a large footprint. Summary of the Invention

[0004] The embodiments of this application provide a frequency converter testing system to solve the technical problems of high cost and large footprint of existing testing platforms.

[0005] To address the aforementioned technical problems, embodiments of this application disclose the following technical solutions:

[0006] This application provides a frequency converter testing system, including:

[0007] Power module;

[0008] Transformer module: The transformer module is electrically connected to the power supply module via a circuit adapter module;

[0009] The accompanying testing component is electrically connected to the transformer module through the circuit adapter module;

[0010] Test station module: The test station is electrically connected to the transformer module through the circuit adapter module, and the test station module is used to pre-connect the frequency converter under test;

[0011] Motor module: One end of the motor module is electrically connected to the workstation module under test through the circuit adapter module, and the other end of the motor module is electrically connected to the test component.

[0012] Furthermore, the circuit switching module includes a first switching module, a second switching module, a third switching module, a fourth switching module, a fifth switching module, and a sixth switching module.

[0013] Furthermore, the transformer module includes a first transformer and a second transformer, wherein the first transformer is a three-winding transformer and the second transformer is a two-winding transformer;

[0014] The first transformer includes a first transformer input terminal, a first transformer output terminal, and a second transformer output terminal. The first transformer input terminal is electrically connected to the first adapter module, the first transformer output terminal is electrically connected to the second adapter module, and the second transformer output terminal is electrically connected to the third adapter module.

[0015] The second transformer includes a second transformer input terminal and a third transformer output terminal. The second transformer input terminal is electrically connected to the sixth adapter module, and the third transformer output terminal is electrically connected to the fifth adapter module.

[0016] Furthermore, the accompanying testing component includes a reactor module, a frequency converter module, and a braking module;

[0017] The reactor module includes a grid-connected reactor, which includes a reactor input terminal and a reactor output terminal. The reactor input terminal is connected to the fifth adapter module, and the reactor output terminal is connected to the fourth adapter module.

[0018] The frequency converter module includes a filter, a first converter module, and a second converter module. The filter includes a filter input terminal and a filter output terminal. The first converter module includes a first AC terminal and a first DC terminal. The second converter module includes a second AC terminal and a second DC terminal. The filter input terminal is connected to the fifth adapter module. The filter output terminal is connected to the first AC terminal. The first DC terminal of the first converter module is connected to the second AC terminal. The second DC terminal of the second converter module is connected to the motor module.

[0019] The braking module includes a third converter module, a fourth converter module, a fifth converter module, and a braking unit;

[0020] The third converter module includes a third AC terminal and a third DC terminal; the fourth converter module includes a fourth AC terminal and a fourth DC terminal; the fifth converter module includes a fifth AC terminal and a fifth DC terminal; the third DC terminal, the fourth DC terminal, and the fifth DC terminal are connected to the first DC bus; the third AC terminal, the fourth AC terminal, and the fifth AC terminal have reserved wiring.

[0021] The braking unit is electrically connected to the first DC bus.

[0022] Furthermore, the system also includes a test station module, which includes a wiring station and a second DC bus. The wiring station includes a first terminal and a second terminal, and the second terminal is connected to the second DC bus.

[0023] Furthermore, the power module includes a first power supply and a second power supply; the first power supply is connected to the first adapter module, and the second power supply is electrically connected to the workstation module under test, the accompanying test component, and the workstation module to be tested, wherein the output voltage of the first power supply is greater than the output voltage of the second power supply.

[0024] Furthermore, the power module also includes a third power supply, which is a backup power supply, and the output voltage of the second power supply is greater than the output voltage of the third power supply.

[0025] Furthermore, the system also includes a mobile test module, which comprises an AC / DC load module, a short-circuit module, and a battery pack module.

[0026] Furthermore, the motor module includes a first motor and a second motor. One end of the first motor is connected to a fourth adapter module, and the other end of the first motor is connected to one end of the second motor. The other end of the second motor is connected to the second AC terminal of the second converter module.

[0027] Furthermore, the first DC bus and the second DC bus are connected, the first DC bus is provided with a first control switch, and the first DC bus and the second DC bus are connected through a second control switch.

[0028] One of the above technical solutions has the following advantages or beneficial effects:

[0029] Compared with existing technologies, this application discloses a frequency converter testing system, including a power supply module, a transformer module, a test module, a workstation under test module, a motor module, and a mobile test module. The transformer module is electrically connected to the power supply module via a circuit adapter module; the test module is electrically connected to the transformer module via a circuit adapter module; the workstation under test is electrically connected to the transformer module via a circuit adapter module, and the workstation under test module is used for pre-connecting the frequency converter under test; one end of the motor module is electrically connected to the workstation under test module via a circuit adapter module, and the other end of the motor module is electrically connected to the test module. The modules in this application are interconnected via circuit adapter modules, allowing for the addition or removal of equipment as needed for testing. This reduces the number of devices, the floor space required, and the wiring between devices, while simultaneously increasing the system's testing capabilities. Attached Figure Description

[0030] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0031] Figure 1 System structure block diagram provided for embodiments of this application;

[0032] Figure 2 This is a schematic diagram of the system circuit connection structure provided in the embodiments of this application;

[0033] Figure 3 This is a schematic diagram of the circuit connection for testing the performance of the frequency converter cabinet provided in an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the circuit connection for testing the thermal stability of a frequency converter cabinet provided in an embodiment of this application;

[0035] Figure 5 A schematic diagram of the rectifier function test circuit of the converter module provided in the embodiments of this application;

[0036] Figure 6 A schematic diagram of the bidirectional DC function test circuit of the converter module provided in the embodiments of this application;

[0037] Figure 7 A schematic diagram of the inverter function test circuit of the converter module provided in the embodiments of this application;

[0038] Figure 8 This is a schematic diagram of the circuit connection for the motor testing function of the converter module provided in this application embodiment. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] The specific implementation methods of this application are illustrated below through examples:

[0041] like Figure 1 As shown in the illustration, this application provides a frequency converter testing system, including a power supply module, a transformer module, a test module, a workstation under test module, a motor module, and a mobile test module. The transformer module is electrically connected to the power supply module via a circuit adapter module. The test module is electrically connected to the transformer module via a circuit adapter module. The workstation under test is electrically connected to the transformer module via a circuit adapter module, and the workstation under test module is used for pre-connecting the frequency converter under test. One end of the motor module is electrically connected to the workstation under test module via a circuit adapter module, and the other end of the motor module is electrically connected to the test module. It is understood that in this application, the modules are interconnected via circuit adapter modules. When testing the frequency converter, the system can add or remove equipment as needed, thus reducing the amount of equipment used, thereby reducing the footprint and the wiring between devices. Simultaneously, it increases the system's testing capabilities, making the system more comprehensive.

[0042] like Figure 2 As shown in the embodiments of this application, the circuit conversion module includes a first conversion module S1, a second conversion module S2, a third conversion module S3, a fourth conversion module S4, a fifth conversion module S5, and a sixth conversion module S6. It is understood that the first conversion module S1, the second conversion module S2, the third conversion module S3, the fourth conversion module S4, the fifth conversion module S5, and the sixth conversion module S6 are each a separate conversion box, and each conversion box is movable, thereby facilitating wiring and operation between modules. Specifically, the first conversion module S1 includes four connection ports and a set of shorting copper busbars. The four connection ports can be connected according to wiring needs; for example, connection port one can be connected to connection port two alone, or simultaneously to connection ports two and three. The second conversion module S2 includes two connection ports, enabling interconnection between the two connection ports. The third conversion module S3 and the fourth conversion module S4 each include four connection ports. The fifth conversion module S5 and the sixth conversion module S6 each include three connection ports. In some other embodiments, the first adapter module S1, the second adapter module S2, the third adapter module S3, the fourth adapter module S4, the fifth adapter module S5, and the sixth adapter module S6 are integrated into a single adapter box. Controlling multiple adapter modules through a single adapter box facilitates wiring for operators during connection operations, avoiding the need for them to move around. Simultaneously, this adapter box can be connected to a host computer, allowing the system to control the connection status of each connector, thus enabling remote control of the automatic connection of each connector via the host computer.

[0043] like Figure 2As shown in this embodiment, the transformer module includes a first transformer T1 and a second transformer T2. The first transformer T1 is a three-winding transformer, and the second transformer T2 is a two-winding transformer. The first transformer T1 includes a first input terminal, a first output terminal, and a second output terminal. The first input terminal is electrically connected to either the second or third terminal of the first adapter module S1, the first output terminal is electrically connected to the first terminal of the second adapter module S2, and the second output terminal is electrically connected to the first terminal of the third adapter module S3. The second transformer T2 includes a second input terminal and a third output terminal. The second input terminal is electrically connected to either the second or third terminal of the sixth adapter module S6, and the third output terminal is electrically connected to the first terminal of the fifth adapter module S5. It can be understood that the first transformer T1 and the second transformer T2 are used to adjust the system voltage, lowering the input high voltage for system testing operations. The specific wiring method of the first transformer T1 and the second transformer T2 depends on the adjustable range and tap type of the transformer.

[0044] like Figure 2 As shown in the embodiment of this application, the test component includes a reactor module, a frequency converter module, and a braking module; the reactor module includes a grid-connected reactor, which includes a reactor input terminal and a reactor output terminal. The reactor input terminal is electrically connected to the second terminal of the fifth adapter module S5, and the reactor output terminal is electrically connected to the fourth terminal of the fourth adapter module S4.

[0045] like Figure 2 As shown in the embodiment of this application, the frequency converter module includes a set of four-quadrant back-to-back frequency converters, including an LCL filter, a first converter module Q1 and a second converter module Q2. The filter includes a filter input terminal and a filter output terminal. The first converter module Q1 includes a first AC terminal and a first DC terminal. The second converter module Q2 includes a second AC terminal and a second DC terminal. The filter input terminal is electrically connected to the third terminal of the fifth adapter module S5, and the filter output terminal is connected to the first AC terminal. The first DC terminal of the first converter module Q1 is connected to the second AC terminal, and the second DC terminal of the second converter module Q2 is connected to the motor module.

[0046] like Figure 2As shown in this embodiment, the braking module includes a third converter module Q3, a fourth converter module Q4, a fifth converter module Q5, and a braking unit. The third converter module Q3 includes a third AC terminal P1-4 and a third DC terminal; the fourth converter module Q4 includes a fourth AC terminal P1-5 and a fourth DC terminal; the fifth converter module Q5 includes a fifth AC terminal P1-6 and a fifth DC terminal. The third, fourth, and fifth DC terminals are connected to the first DC bus. Wiring is reserved on the third, fourth, and fifth AC terminals P1-4, P1-5, and P1-6, and the braking unit is electrically connected to the first DC bus. It is understood that the third, fourth, and fifth AC terminals P1-4, P1-5, and P1-6 can be configured as terminals to facilitate wiring between devices. The test station is equipped with a first terminal P1-1, a second terminal P1-2, and a third terminal P1-3. The first terminal P1-1, the second terminal P1-2, and the third terminal P1-3 are used to connect to the third AC terminal P1-4, the fourth AC terminal P1-5, and the fifth AC terminal P1-6 to control the connection and disconnection.

[0047] like Figure 2 As shown in this embodiment, the test station module includes a wiring station and a second DC bus. The wiring station includes a first terminal and a second terminal, with the second terminal connected to the second DC bus. It is understood that the wiring station includes at least three stations for connecting the device under test (DUT) or module, and each station is connected to a screen for displaying data parameters. The first terminal is used for wiring according to the test method of the DUT or module. The second terminal is connected to the second DC bus for current signal transmission. The test station is equipped with a first connecting post PD-1, a second connecting post PD-2, and a third connecting post PD-3, which are used for connecting the lines in the wiring station.

[0048] like Figure 2 As shown in the embodiment of this application, the power module includes a first power supply, a second power supply, and a third power supply; the first power supply, the second power supply, and the third power supply are integrated in a power distribution cabinet. The first power supply includes a first power line CB1, which is electrically connected to the first connection port of the first adapter module S1; the second power supply includes a second power line CB2, a third power line CB3, and a fourth power line CB4, wherein the second power line CB2 is electrically connected to the module under test, the third power line CB3 is electrically connected to the component under test, and the fourth power line CB4 is electrically connected to the module under test. The first power supply has an output power of 2MW and an output current of 200A, the second power supply has an output voltage of 220V and an output current of 32A, and the third power supply is a backup power supply. In some other embodiments, the output voltage of the first and second power supplies is 380V, and the output voltage of the third power supply is 220V.

[0049] like Figure 2 As shown in the embodiment of this application, the mobile test module includes an AC / DC load module, a short-circuit module, and a battery pack module. It is understood that when the system circuit requires the use of the DC load module, short-circuit module, or battery pack module, it can be connected to the circuit for use. The DC load module, short-circuit module, and battery pack module can be individually integrated into a movable cabinet, allowing for easy connection by personnel when needed.

[0050] like Figure 2 As shown in the embodiment of this application, the motor module includes a first motor M1 and a second motor M2. One end of the first motor M1 is connected to the first terminal of the fourth adapter module S4, and the other end of the first motor M2 is connected to one end of the second motor M2. The other end of the second motor M2 is connected to the second AC terminal of the second converter module Q2.

[0051] like Figure 2 As shown in the embodiment of this application, the first DC bus and the second DC bus are electrically connected. A first control switch SW1 is provided on the first DC bus, and the first and second DC buses are connected via a second control switch SW2. When the second control switch SW2 is closed, the first and second DC buses are connected; when the second control switch SW2 is open, the first and second DC buses are disconnected. The end of the first DC bus furthest from the second DC bus is connected to the first DC terminal of the first converter module Q1. When the first control switch SW1 is open, the first DC bus is disconnected from the first DC terminal; when the first control switch SW2 is closed, the first DC bus is connected to the first DC terminal. It can be understood that the connection between the first DC bus and the first converter module Q1 can be controlled by the first control switch SW1, thereby controlling the DC current. Simultaneously, when DC current is required in the module under test, it can be controlled by the second control switch SW2.

[0052] The following section uses specific implementations of current to further illustrate the testing functions achievable by this system:

[0053] Example 1

[0054] By modifying the wiring of the testing system, it is possible to test a back-to-back inverter cabinet. For example... Figure 3As shown, in the first adapter module S1, connectors 1 and 2 are connected, connecting the first transformer input terminal of the first transformer T1 to the first power line CB1; in the third adapter module S3, connectors 1, 2, and 4 are connected, connecting the first transformer output terminal of the first transformer T1 to the tested workstation and the second transformer T2 respectively; in the fourth adapter module S4, connectors 1 and 3 are connected, connecting the north workstation to the first motor M1; in the fifth adapter module S5, connectors 1 and 3 are connected, connecting the second transformer output terminal of the second transformer T2 to the LCL filter; in the sixth adapter module S6, connectors 1 and 2 are connected. Through the circuit connections described in Embodiment 1, the system circuit can possess functions such as testing the tested cabinet with a motor drive and generating electricity driven by the motor.

[0055] Example 2

[0056] like Figure 4 As shown, in the first adapter module S1, connection ports 1 and 2 are connected, connecting the first transformer input terminal of the first transformer T1 to the first power supply line CB1; in the third adapter module S3, connection ports 1, 2, and 4 are connected, connecting the first transformer output terminal of the first transformer T1 to the tested workstation and the second transformer T2 respectively; in the fourth adapter module S4, connection ports 3 and 4 are connected, connecting the tested workstation to one end of the grid-connected reactor; in the fifth adapter module S5, connection ports 1 and 2 are connected, connecting the second transformer T2 to the other end of the grid-connected reactor; in the sixth adapter module S6, connection ports 1 and 2 are connected, connecting the first transformer output terminal of the first transformer T1 to the input terminal of the second transformer T2; through the circuit connection of Embodiment 2, the system circuit can have the function of testing the full-power characteristics and thermal stability of the tested cabinet.

[0057] Example 3

[0058] like Figure 5As shown, a module Q6 is installed in the test panel. When testing the rectification function, in the first adapter module S1, the first and second terminals are connected, so that the first transformer input terminal of the first transformer T1 is connected to the first power supply line CB1; in the third adapter module S3, the first and third terminals are connected, so that the first transformer output terminal of the first transformer T1 is connected to the second terminal P1-2 in the test station; in the fourth adapter module S4, the first and second terminals are connected, and the fifth AC terminal P1-6 is connected to the third terminal P1-3, so that the fifth AC terminal P1-6 of the fifth converter module Q5 is connected to the third terminal P1-3. 6. Connect to the first motor M1; in the fifth adapter module S5, the first and third terminals are connected, so that the second transformer T2 is connected to one end of the grid-connected reactor; in the sixth adapter module S6, the first and second terminals are connected, so that the first transformer output terminal of the first transformer T1 is connected to the input terminal of the second transformer T2, and at the same time, the second connection post PD-2 of the test station module is connected to the second terminal P1-2 in the test station, and the second control switch SW2 in the first DC bus and the second DC bus is closed. Through the circuit connection of embodiment 3, the system circuit can have the function of testing the converter module.

[0059] Example 4

[0060] like Figure 6 As shown, in the first adapter module S1, terminals 1 and 2 are connected, connecting the first transformer input terminal of the first transformer T1 to the first power supply line CB1; in the third adapter module S3, terminals 1 and 3 are connected, connecting the first transformer output terminal of the first transformer T1 to the second terminal P1-2 in the auxiliary testing component, and simultaneously, the second terminal P1-2 in the auxiliary testing component is connected to the fourth AC terminal P1-5 in the fourth converter module; in the fourth adapter module S4, terminals 1 and 2 are connected, connecting the first transformer input terminal of the first transformer T1 to the first power supply line CB1. A motor M1 is connected to the third terminal P1-3; in the fifth adapter module S5, the first terminal and the third terminal are connected, so that the second transformer T2 is connected to one end of the grid-connected reactor; in the sixth adapter module S6, the first terminal and the second terminal are connected, so that the first transformer output terminal of the first transformer T1 is connected to the input terminal of the second transformer T2. At the same time, a set of reactors L are added to the second connection post PD-2 of the test station module and connected to the battery pack. Through the circuit connection of embodiment 4, the system circuit can have the function of testing bidirectional DC.

[0061] Example 5

[0062] like Figure 7As shown, in the first adapter module S1, terminals 1 and 2 are connected, connecting the first transformer input terminal of the first transformer T1 to the first power supply line CB1; in the third adapter module S3, terminals 1 and 3 are connected, connecting the first transformer output terminal of the first transformer T1 to the second terminal P1-2 in the auxiliary testing component, and simultaneously connecting the second terminal P1-2 in the auxiliary testing component to the fourth AC terminal P1-5 in the fourth converter module; in the fourth adapter module S4, terminals 1 and 2 are connected, connecting the first transformer input terminal of the first transformer T1 to the first power supply line CB1. Machine M1 is connected to the third terminal P1-3; in the fifth adapter module S5, the first terminal and the third terminal are connected, so that the second transformer T2 is connected to one end of the grid-connected reactor; in the sixth adapter module S6, the first terminal and the second terminal are connected, so that the first transformer output terminal of the first transformer T1 is connected to the input terminal of the second transformer T2. At the same time, after adding a set of LCL filters to the second connection post PD-2 of the test station module, it is connected to the AC / DC load module. Through the circuit connection of embodiment 5, the system circuit can have the function of testing inverters.

[0063] Example 6

[0064] like Figure 8 As shown, in the first adapter module S1, terminals 1 and 2 are connected, connecting the first transformer input terminal of the first transformer T1 to the first power supply line CB1; in the third adapter module S3, terminals 1 and 3 are connected, connecting the first transformer output terminal of the first transformer T1 to the second terminal P1-2 in the auxiliary testing component, and simultaneously connecting the second terminal P1-2 in the auxiliary testing component to the fourth AC terminal P1-5 in the fourth converter module; in the fourth adapter module S4, terminals 1 and 2 are connected, connecting the first motor M1 to the third terminal P1-5. 3. Connection: In the fifth adapter module S5, connection ports 1 and 3 are connected, allowing the second transformer T2 to connect to one end of the grid-connected reactor. In the sixth adapter module S6, connection ports 1 and 2 are connected, allowing the first transformer output terminal of the first transformer T1 to connect to the input terminal of the second transformer T2. Simultaneously, the second connection post PD-2 of the test station module is connected to the third terminal P1-3 of the auxiliary test station. The second control switch SW2 in the first and second DC buses is closed. Through the circuit connection in Embodiment 6, the system circuit can possess the function of testing motor control. It also has the function of testing the tested cabinet with a motor drive and the generator driven by the motor.

[0065] Based on the single-module function test in Examples 2-6, by adding appropriate filters to the module input and output, the parallel characteristics of multiple modules can also be tested.

[0066] The inverter testing system provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A frequency converter testing system, characterized in that, include: Power module; Transformer module: The transformer module is electrically connected to the power supply module via a circuit adapter module; The test station module includes a wiring station and a second DC bus. The wiring station includes a first terminal and a second terminal, and the second terminal is connected to the second DC bus. The first terminal is used to make connections according to the test method of the device or module under test. The accompanying testing component is electrically connected to the transformer module via the circuit adapter module. The accompanying testing component includes a braking module, which comprises a third converter module, a fourth converter module, a fifth converter module, and a braking unit. The third converter module includes a third AC terminal and a third DC terminal; the fourth converter module includes a fourth AC terminal and a fourth DC terminal; and the fifth converter module includes a fifth AC terminal and a fifth DC terminal. The third, fourth, and fifth DC terminals are connected to a first DC bus, and the third, fourth, and fifth AC terminals have pre-installed wiring. The braking unit is electrically connected to the first DC bus. Test station module: The test station is electrically connected to the transformer module through the circuit adapter module, and the test station module is used for pre-connection of the frequency converter under test; Motor module: One end of the motor module is electrically connected to the tested workstation module through the circuit adapter module, and the other end of the motor module is electrically connected to the test component; The first DC bus and the second DC bus are connected.

2. The inverter testing system as described in claim 1, characterized in that, The circuit switching module includes a first switching module, a second switching module, a third switching module, a fourth switching module, a fifth switching module, and a sixth switching module; The first adapter module, the second adapter module, the third adapter module, the fourth adapter module, the fifth adapter module, and the sixth adapter module are each separate movable adapter boxes.

3. The inverter testing system as described in claim 2, characterized in that, The transformer module includes a first transformer and a second transformer, wherein the first transformer is a three-winding transformer and the second transformer is a two-winding transformer; The first transformer includes a first transformer input terminal, a first transformer output terminal, and a second transformer output terminal. The first transformer input terminal is electrically connected to the first adapter module, the first transformer output terminal is electrically connected to the second adapter module, and the second transformer output terminal is electrically connected to the third adapter module. The second transformer includes a second transformer input terminal and a third transformer output terminal. The second transformer input terminal is electrically connected to the sixth adapter module, and the third transformer output terminal is electrically connected to the fifth adapter module.

4. The inverter testing system as described in claim 3, characterized in that, The accompanying testing components include a reactor module and a frequency conversion module; The reactor module includes a grid-connected reactor, which includes a reactor input terminal and a reactor output terminal. The reactor input terminal is connected to the fifth adapter module, and the reactor output terminal is connected to the fourth adapter module. The frequency converter module includes a filter, a first converter module, and a second converter module. The filter includes a filter input terminal and a filter output terminal. The first converter module includes a first AC terminal and a first DC terminal. The second converter module includes a second AC terminal and a second DC terminal. The filter input terminal is connected to the fifth adapter module. The filter output terminal is connected to the first AC terminal. The first DC terminal of the first converter module is connected to the second AC terminal. The second DC terminal of the second converter module is connected to the motor module.

5. The inverter testing system as described in claim 4, characterized in that, The power module includes a first power supply and a second power supply; the first power supply is connected to the first adapter module, and the second power supply is electrically connected to the workstation module under test, the accompanying test component, and the workstation module to be tested, wherein the output voltage of the first power supply is greater than the output voltage of the second power supply.

6. The inverter testing system as described in claim 5, characterized in that, The power module also includes a third power supply, which is a backup power supply, and the output voltage of the second power supply is greater than the output voltage of the third power supply.

7. The inverter testing system as described in claim 1, characterized in that, The system also includes a mobile test module, which comprises an AC / DC load module, a short-circuit module, and a battery pack module.

8. The frequency converter testing system as described in claim 4, characterized in that, The motor module includes a first motor and a second motor. One end of the first motor is connected to a fourth adapter module, and the other end of the first motor is connected to one end of the second motor. The other end of the second motor is connected to the second AC terminal of the second converter module.

9. The frequency converter testing system as described in claim 1, characterized in that, A first control switch is provided on the first DC bus, and the first DC bus and the second DC bus are connected through a second control switch.

10. The inverter testing system as described in claim 9, characterized in that, When the second control switch is closed, the first DC bus and the second DC bus are connected; when the second control switch is open, the first DC bus and the second DC bus are disconnected. The end of the first DC bus away from the second DC bus is connected to the first DC terminal of the first converter module. When the first control switch is open, the first DC bus is disconnected from the first DC terminal; when the first control switch is closed, the first DC bus is connected to the first DC terminal, thereby realizing the control of DC current. When DC current is required in the test station module, it is controlled by the second control switch.

Images