A converter aging test platform and working method thereof

Abstract

The present invention discloses a converter aging test platform and a working method thereof, which belong to the technical field of converters. The present invention includes a first converter, a second converter, a transformer, a circuit breaker and a control system; the circuit breaker is respectively connected to the primary side of the power supply and the transformer, the secondary side of the transformer is connected to the AC side of the first converter, the DC side of the first converter is connected to the DC side of the second converter, and the AC side of the second converter is connected to the AC side of the first converter; the first converter, the second converter, the transformer and the circuit breaker are all connected to the control system. The present invention builds a set of test platforms and can realize the aging test of two converters by wiring once, which improves the efficiency of the test and reduces the cost of platform construction and equipment investment. During the test process, energy circulates in the loop of the system, greatly reducing power consumption. The structure of the platform is compact, which saves space compared to building a specific aging test platform and has good application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of converters, and in particular relates to a converter aging test platform and a working method thereof. Background Art

[0002] The proposal of the dual carbon target has accelerated the development of the energy storage market. As the core conversion device of the energy storage system, the reliability and stability of the converter is crucial. Full-power aging test is an important part of the converter reliability test. How to improve the efficiency of aging test and reduce the test cost is of great significance to converter manufacturers.

[0003] Currently, the inverter aging test mostly adopts the motor dragging method, which can simulate the operation conditions more realistically. However, for products with multiple capacity series, it requires huge costs and space to establish a test platform. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a converter aging test platform and a working method thereof, which can efficiently perform aging tests on converters, are easy to operate, low in cost, and occupy a small area.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention discloses an inverter aging test platform, comprising a first inverter, a second inverter, a transformer, a circuit breaker and a control system; the circuit breaker is respectively connected to a power supply and a primary side of the transformer, the secondary side of the transformer is connected to the AC side of the first inverter, the DC side of the first inverter is connected to the DC side of the second inverter, and the AC side of the second inverter is connected to the AC side of the first inverter; the first inverter, the second inverter, the transformer and the circuit breaker are all connected to the control system.

[0007] Preferably, the circuit breaker is a three-phase AC circuit breaker.

[0008] Preferably, the power source is an AC power grid.

[0009] Preferably, the transformation ratio of the transformer is 1:1.

[0010] Preferably, the first converter and the second converter are both three-phase three-level T-type topology structures.

[0011] Preferably, parameters of the first converter and the second converter are consistent.

[0012] Preferably, the control system has a built-in timer module.

[0013] Preferably, the first converter and the second converter have two control modes: direct current source and charge and discharge.

[0014] The working method of the above-mentioned converter aging test platform disclosed in the present invention includes: setting the first converter to a DC source mode, the second converter to a charging or discharging mode, closing the circuit breaker, and running a mode cycle under full power; disconnecting the circuit breaker, setting the second converter to a DC source mode, the first converter to a charging or discharging mode, closing the circuit breaker, and running a test cycle under full power; the first converter and the second converter provide a DC side constant voltage state in the DC source mode; the first converter and the second converter operate in a rectification state of voltage and current dual-loop control in the charging mode; the first converter and the second converter operate in an inversion state of a single current loop in the discharge mode; and the above modes are cycled until the aging test is completed.

[0015] Preferably, one mode cycle is 1.5 to 2.5 hours.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] The present invention discloses a converter aging test platform. By building a set of test platforms and wiring once, two converters can be tested for aging, which improves the test efficiency and reduces the cost of platform construction and equipment investment. During the test, energy circulates in the system loop, greatly reducing power consumption. The platform has a compact structure, saves space compared to building a specific aging test platform, and has good application prospects.

[0018] Furthermore, the transformation ratio of the transformer is 1:1, which can play an isolation role and improve the safety of the system.

[0019] Furthermore, the parameters of the first converter and the second converter are consistent, so that a large difference in working conditions is avoided to affect the test results; and at the same time, the test platform can be fully utilized.

[0020] Furthermore, the control system has a built-in timer module that can set the time and switch the working mode of the converter, with a high degree of automation.

[0021] The working method of the converter aging test platform disclosed in the present invention has high automation, high test efficiency and low energy consumption.

[0022] Furthermore, one mode cycle is 1.5 to 2.5 hours, which can fully perform aging test on the converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A topological diagram of the converter aging test platform of the present invention;

[0024] Figure 2 This is the main circuit diagram of the converter.

[0025] In the figure: 1-first converter; 2-second converter; 3-transformer; 4-circuit breaker. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings, the contents of which are intended to explain the present invention rather than to limit it:

[0027] like Figure 1 , is a converter aging test platform of the present invention, comprising a first converter 1, a second converter 2, a transformer 3, a circuit breaker 4 and a control system; the circuit breaker 4 is connected to the power supply and the primary side of the transformer 3 respectively, the secondary side of the transformer 3 is connected to the AC sides A, B, and C of the first converter 1, the DC sides BUS+, N, and BUS- of the first converter 1 are correspondingly connected to the DC side of the second converter 2, and the AC side of the second converter 2 is correspondingly connected to the AC sides A, B, and C of the first converter 1; the first converter 1, the second converter 2, the transformer 3 and the circuit breaker 4 are all connected to the control system through signal lines.

[0028] The test platform includes necessary equipment placement positions, such as test positions for the first converter 1 and the second converter 2, as well as required test instruments and safety devices.

[0029] The control system includes but is not limited to a processor, a memory, a display interface, a communication module and a human-computer interaction interface. The human-computer interaction interface may use mechanical keys such as keyboards and buttons, or a touch screen, or a combination of the two.

[0030] In one embodiment of the present invention, the circuit breaker 4 is a three-phase AC circuit breaker.

[0031] In one embodiment of the present invention, the power source is an AC power grid.

[0032] In one embodiment of the present invention, the transformation ratio of the transformer 3 is 1:1, that is, an isolation transformer, which can play an isolation role and improve the safety of the system.

[0033] In one embodiment of the present invention, the first converter 1 and the second converter 2 are both three-phase three-level T-type topology structures, and their main circuit diagram is as follows: Figure 2 shown.

[0034] In a preferred embodiment of the present invention, parameters of the first converter 1 and the second converter 2 are consistent or close.

[0035] In a preferred embodiment of the present invention, the control system has a built-in timer module.

[0036] Working method of the converter aging test platform of the present invention:

[0037] First, set the first converter 1 to the DC source mode, the second converter 2 to the charging or discharging mode, close the circuit breaker 4, when charging, the energy flows in the counterclockwise direction, as shown by the dotted arrow, when discharging, the energy flows in the clockwise direction, as shown by the solid arrow, and runs a mode cycle at full power; disconnect the circuit breaker 4, set the second converter 2 to the DC source mode, the first converter 1 to the charging or discharging mode, close the circuit breaker 4, when charging, the energy flows in the clockwise direction, as shown by the solid arrow, when discharging, the energy flows in the counterclockwise direction, as shown by the dotted arrow, and runs a test cycle at full power; repeat the above mode until the aging test is completed.

[0038] The first converter 1 and the second converter 2 provide a constant voltage state on the DC side in the DC source mode; the first converter 1 and the second converter 2 operate in a rectification state of voltage and current dual-loop control in the charging mode; the first converter 1 and the second converter 2 operate in an inversion state of a single current loop in the discharge mode.

[0039] One mode cycle is 1.5 to 2.5 hours, and generally one mode cycle is set to 2 hours.

[0040] The above is only part of the embodiments of the present invention. Although some terms are used in the present invention, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present invention. It is contrary to the spirit of the present invention to interpret them as any additional restrictions. The above is only to further illustrate the content of the present invention with examples for easier understanding, but it does not mean that the embodiments of the present invention are limited to this. Any technical extension or re-creation made according to the present invention is protected by the present invention.

Claims

1. A working method of a converter aging test platform, characterized in that: The converter aging test platform comprises a first converter (1), a second converter (2), a transformer (3), a circuit breaker (4) and a control system; the circuit breaker (4) is respectively connected to a power source and a primary side of the transformer (3); the secondary side of the transformer (3) is connected to an AC side of the first converter (1); the DC side of the first converter (1) is connected to a DC side of the second converter (2); the AC side of the second converter (2) is connected to an AC side of the first converter (1); the first converter (1), the second converter (2), the transformer (3) and the circuit breaker (4) are all connected to the control system; The working method of the converter aging test platform comprises: a first converter (1) and a second converter (2) having two control modes: a direct current source and a charge-discharge mode; The first converter (1) is set to a DC source mode, the second converter (2) is set to a charging or discharging mode, the circuit breaker (4) is closed, and a mode cycle is run at full power; the circuit breaker (4) is opened, the second converter (2) is set to a DC source mode, the first converter (1) is set to a charging or discharging mode, the circuit breaker (4) is closed, and a test cycle is run at full power; the first converter (1) and the second converter (2) provide a DC side constant voltage state in the DC source mode; the first converter (1) and the second converter (2) operate in a rectification state of voltage and current dual loop control in the charging mode; the first converter (1) and the second converter (2) operate in an inversion state of a single current loop in the discharging mode; and the above modes are cycled until the aging test is completed.

2. The working method of the converter aging test platform according to claim 1, characterized in that: The circuit breaker (4) in the converter aging test platform is a three-phase AC circuit breaker.

3. The working method of the converter aging test platform according to claim 1, characterized in that: The power source in the converter aging test platform is an AC power grid.

4. The working method of the converter aging test platform according to claim 1, characterized in that: The transformation ratio of the transformer (3) in the converter aging test platform is 1:

1.

5. The working method of the converter aging test platform according to claim 1, characterized in that: The first converter (1) and the second converter (2) in the converter aging test platform are both three-phase three-level T-type topology structures.

6. The working method of the converter aging test platform according to claim 1, characterized in that: The parameters of the first converter (1) and the second converter (2) in the converter aging test platform are consistent.

7. The working method of the converter aging test platform according to claim 1, characterized in that: The control system in the converter aging test platform is equipped with a timer module.

8. The working method of the converter aging test platform according to claim 1, characterized in that: One mode cycle is 1.5~2.5 hours.

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