A high-power photovoltaic inverter-PCS shared electrical performance test power supply device

Abstract

The application relates to a power performance test power supply device shared by a high-power photovoltaic inverter and a PCS, which comprises a total switch, a discrete AC power supply module, a cabinet body, a first parallel switch, a first discrete terminal group, a discrete DC power supply module, a second parallel switch and a second discrete terminal group. The discrete AC power supply module is connected with the total switch. The first parallel switch can perform parallel output of AC power on the discrete AC power supply module. The first discrete terminal group performs discrete output of AC power on the discrete AC power supply module. The discrete DC power supply module is connected with the total switch. The second parallel switch performs parallel output of DC power on the discrete DC power supply module. The second discrete terminal group performs discrete output of DC power on the discrete DC power supply module. Compared with the prior art, the application is suitable for power performance test of the high-power photovoltaic inverter and the PCS, can improve the test efficiency and accuracy, and provides strong support for technical personnel in a laboratory.

Description

TECHNICAL FIELD

[0001] The present application relates to an electrical performance test power supply device for electrical devices, in particular to an electrical performance test power supply device for large power photovoltaic inverter-PCS. BACKGROUND

[0002] The photovoltaic inverter and the PCS are a kind of main equipment connecting photovoltaic power generation system and power grid, both have the function of converting DC into AC. However, since the photovoltaic inverter and the PCS are essentially power electronic devices, they will have different degrees of impact on the power grid, which is of great significance to the safety and effectiveness of the photovoltaic power generation system. Therefore, it is necessary to test the electrical performance of large power photovoltaic inverter and PCS together.

[0003] However, the prior art has the following defects when testing the electrical performance of large power photovoltaic inverter and PCS together:

[0004] 1. High cost of test equipment. The price of traditional test equipment is high, which is generally only suitable for small power test requirements. For large power photovoltaic inverter and PCS testing, the traditional equipment is expensive, which limits its wide application.

[0005] 2. The safety of the test process is difficult to guarantee. Large power photovoltaic inverter and PCS need constant power supply when running. If the power supply is unstable or interrupted, it will affect the safety of the power equipment and other equipment. The traditional test equipment cannot effectively solve this problem and lacks safety protection measures.

[0006] Therefore, the above problems need to be solved by researchers. SUMMARY

[0007] The purpose of the present application is to overcome the defects of the prior art and provide an electrical performance test power supply device for large power photovoltaic inverter-PCS, which is suitable for electrical performance test of large power photovoltaic inverter-PCS, can improve the efficiency and accuracy of the test, and provides strong support for engineers and technical personnel in the laboratory.

[0008] The purpose of the present application can be achieved by the following technical solutions:

[0009] The present application provides an electrical performance test power supply device for large power photovoltaic inverter-PCS, comprising a total switch, a discrete AC power supply module, a cabinet, a first parallel switch, a first discrete terminal group, a discrete DC power supply module, a second parallel switch and a second discrete terminal group, wherein specifically:

[0010] The total switch is connected with an external power supply line;

[0011] A discrete AC power supply module is connected to the main switch;

[0012] The first parallel switch is located in the cabinet and is capable of parallel outputting AC power to the discrete AC power modules.

[0013] The first discrete terminal group is located on the cabinet and is capable of outputting AC power to the discrete AC power module.

[0014] A discrete DC power supply module is connected to the main switch;

[0015] The second parallel switch is located in the cabinet and can output DC power to the discrete DC power modules in parallel.

[0016] The second discrete terminal block, located on the cabinet, is capable of outputting DC power to the discrete DC power supply module.

[0017] Furthermore, the first parallel switch is connected to each AC power source in the discrete AC power supply module.

[0018] Furthermore, the second parallel switch is connected to each DC power supply in the discrete DC power supply module.

[0019] Furthermore, the output terminal of the first parallel switch is connected to an AC parallel output terminal, and the output terminal of the second parallel switch is connected to a DC parallel output terminal.

[0020] Furthermore, both the AC parallel output terminal and the DC parallel output terminal are located on the cabinet.

[0021] Furthermore, the electrical performance testing power supply device also includes an anti-islanding power supply, the input terminal of which is connected to the main switch, and the output terminal of which is connected to the AC parallel output terminal.

[0022] Furthermore, a transformer is provided between the AC parallel output terminal and the first parallel switch.

[0023] Furthermore, the output terminal of the anti-islanding power supply is connected to the transformer.

[0024] Furthermore, the output terminal of the anti-islanding power supply is equipped with an islanding access switch.

[0025] Furthermore, the electrical performance testing power supply device also includes a host computer, which is communicatively connected to the main switch, the output and input switches of the discrete AC power supply module, the first parallel switch, the output and input switches of the discrete DC power supply module, and the second parallel switch.

[0026] Compared with the prior art, the present invention has the following technical advantages:

[0027] 1) A power supply device for electrical performance testing shared by high-power photovoltaic inverters and PCS. This invention uses discrete AC power supply modules, discrete DC power supply modules, and first and second parallel switches, which can realize parallel operation and separate output of different power supply modules, and is suitable for testing high-power equipment.

[0028] 2) Simulating Islanding Power Supply Scenarios. The anti-islanding power supply design in this invention can simulate islanding power supply scenarios that occur when a photovoltaic inverter or PCS is in operation, enabling equipment testing in a laboratory environment. This function makes the test results more accurate and reliable, and can help relevant personnel better understand the problems that the equipment may encounter in actual operation.

[0029] 3) Remote control. This invention is equipped with a host computer, which can remotely control and adjust the main switch, AC power module, DC power module, and parallel switch via network, facilitating testing operations.

[0030] 4) Safe and reliable. This invention employs multi-level safety protection functions to avoid safety issues such as overcurrent and overvoltage, ensuring safe use. In addition, the anti-islanding power supply provides extra power backup, ensuring that the accuracy of tests is not affected by power outages.

[0031] 5) Flexibility. Several design features in this solution, such as the inclusion of AC and DC parallel output terminals, make it adaptable and flexible, suitable for various testing needs and application scenarios. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the electrical performance testing power supply device shared by the high-power photovoltaic inverter and PCS in this technical solution.

[0033] In the diagram: 1. Main switch, 2. Discrete AC power supply module, 3. Cabinet, 4. First parallel switch, 5. First discrete terminal block, 6. Discrete DC power supply module, 7. Second parallel switch, 8. Second discrete terminal block, 10. DC parallel output terminal, 11. Anti-islanding power supply, 12. Transformer, 13. Islanding access switch, 14. Host computer, 15. Device under test. Detailed Implementation

[0034] This technical solution solves the problems of traditional testing equipment by designing a dedicated testing device and employing technologies such as anti-islanding power supply, remote control, safety, reliability, and flexibility. It can ensure that the test will not be affected by power outages and can provide accurate and reliable data, providing a reliable testing solution for relevant partners.

[0035] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0036] The electrical performance testing power supply device shared by the high-power photovoltaic inverter-PCS in this invention includes a main switch 1, a discrete AC power supply module 2, a cabinet 3, a first parallel switch 4, a first discrete terminal group 5, a discrete DC power supply module 6, a second parallel switch 7, and a second discrete terminal group 8, as detailed below. Figure 1 The invention employs components such as discrete AC power modules, discrete DC power modules, and first and second parallel switches, enabling parallel operation and separate output of different power modules, and is suitable for testing high-power equipment.

[0037] The main switch 1 is connected to an external power supply line; the discrete AC power module 2 is connected to the main switch 1.

[0038] Cabinet 3 is an enclosed structure used to house switches and terminals. Both the AC parallel output terminal 9 and the DC parallel output terminal 10 are located on cabinet 3. A second parallel switch 7 is located within cabinet 3 and is capable of parallel outputting DC power to the discrete DC power supply modules 6. The second parallel switch 7 is connected to each DC power supply in the discrete DC power supply modules 6.

[0039] The first parallel switch 4 is located in the cabinet 3 and is capable of parallel outputting AC power to the discrete AC power modules 2. The first parallel switch 4 is connected to each AC power source in the discrete AC power modules 2. The output terminal of the first parallel switch 4 is connected to the AC parallel output terminal 9, and the output terminal of the second parallel switch 7 is connected to the DC parallel output terminal 10.

[0040] The first discrete terminal group 5 is located on the cabinet 3 and can output AC power to the discrete AC power module 2; the discrete DC power module 6 is connected to the main switch 1; the second discrete terminal group 8 is located on the cabinet 3 and can output DC power to the discrete DC power module 6.

[0041] The electrical performance testing power supply device also includes an anti-islanding power supply 11. The input terminal of the anti-islanding power supply 11 is connected to the main switch 1, and the output terminal of the anti-islanding power supply 11 is connected to the AC parallel output terminal 9. A transformer 12 is connected between the AC parallel output terminal 9 and the first parallel switch 4. The output terminal of the anti-islanding power supply 11 is connected to the transformer 12. An islanding access switch 13 is provided at the output terminal of the anti-islanding power supply 11. The design of the anti-islanding power supply in this invention can simulate the islanding power supply scenario that occurs when a photovoltaic inverter or PCS is in operation, enabling equipment testing in a laboratory environment. This function makes the test results more accurate and reliable, and can help relevant personnel better understand the problems that the equipment may encounter in actual operation.

[0042] The electrical performance testing power supply device also includes a host computer 14, which is communicatively connected to the main switch 1, the output and input switches of the discrete AC power module 2, the first parallel switch 4, the output and input switches of the discrete DC power module 6, and the second parallel switch 7. The host computer 14 is a PC or remote user terminal that communicates with each switch. This invention is equipped with a host computer 14, which allows for remote control and adjustment of the main switch, AC power modules, DC power modules, and parallel switches via a network, facilitating testing operations.

[0043] In this technical solution, the discrete AC power supply module 2, the discrete DC power supply module 6, and the anti-islanding power supply 11 all include high-quality rectifiers to ensure stable output voltage and current, while avoiding the generation of current harmonics and noise. Furthermore, accurate current and voltage sensors can be used to monitor the electrical parameters of the circuit in real time, ensuring that the output capability meets specifications.

[0044] All of the above switches can be remote electric switches, communicating with the host computer via wireless communication. Suitable models for remote electric switches include SONOFF and TP-Link HS100.

[0045] The device under test 15 can be connected to the target terminal according to the test power requirements, and connected to the corresponding test equipment to realize the test of its electrical performance. The relevant equipment and test methods are not part of the concept of this solution, and existing test methods and equipment can be used, so they will not be described in detail.

[0046] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A power supply device for electrical performance testing shared by a high-power photovoltaic inverter and PCS, characterized in that, include: The main switch (1) is connected to the external power supply line; The discrete AC power supply module (2) is connected to the main switch (1); Cabinet (3); The first parallel switch (4) is located in the cabinet (3) and can output AC power to the discrete AC power module (2) in parallel. The first discrete terminal group (5) is located on the cabinet (3) and can output AC power to the discrete AC power module (2). The discrete DC power supply module (6) is connected to the main switch (1); The second parallel switch (7) is located in the cabinet (3) and can output DC power to the discrete DC power supply module (6) in parallel. The second discrete terminal group (8) is located on the cabinet (3) and can output DC power to the discrete DC power module (6). The first parallel switch (4) is connected to each AC power source in the discrete AC power module (2); The second parallel switch (7) is connected to each DC power supply in the discrete DC power supply module (6); The output terminal of the first parallel switch (4) is connected to an AC parallel output terminal (9), and the output terminal of the second parallel switch (7) is connected to a DC parallel output terminal (10). The AC parallel output terminal (9) and the DC parallel output terminal (10) are both located on the cabinet (3).

2. The power supply device for electrical performance testing shared by a high-power photovoltaic inverter and PCS according to claim 1, characterized in that, The electrical performance test power supply device also includes an anti-islanding power supply (11), the input terminal of which is connected to the main switch (1), and the output terminal of which is connected to the AC parallel output terminal (9).

3. The power supply device for electrical performance testing shared by a high-power photovoltaic inverter and PCS according to claim 2, characterized in that, A transformer (12) is provided between the AC parallel output terminal (9) and the first parallel switch (4).

4. The power supply device for electrical performance testing shared by a high-power photovoltaic inverter and PCS according to claim 3, characterized in that, The output terminal of the anti-islanding power supply (11) is connected to the transformer (12).

5. The power supply device for electrical performance testing shared by a high-power photovoltaic inverter and PCS according to claim 3, characterized in that, The output terminal of the anti-islanding power supply (11) is equipped with an islanding access switch (13).

6. The power supply device for electrical performance testing shared by a high-power photovoltaic inverter and PCS according to claim 1, characterized in that, The electrical performance test power supply device also includes a host computer (14), which is communicatively connected to the main switch (1), the output and input switches of the discrete AC power module (2), the first parallel switch (4), the output and input switches of the discrete DC power module (6), and the second parallel switch (7).

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