Online testing device and method for power module of power electronic transformer

A technology of power modules and power electronics, which is applied in the field of on-line test devices for power electronic transformer power modules, can solve the problems of large test loss, insufficient stability test, insufficient and incomplete power module test, etc., to achieve the test of power supply loss The effect of small size, sufficient function test, and simple test operation

Inactive Publication Date: 2021-03-26
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of existing test circuits that are relatively complex, require multiple DC voltage sources to operate synchronously, have large test losses, and the stability test is insufficient and incomplete, and provide an online test device for power electronic transformer power modules
The invention has small test power supply loss, simple test operation, and solves the problem of insufficient and incomplete test of power modules by previous test platforms and test methods

Method used

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  • Online testing device and method for power module of power electronic transformer

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Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 Shown is an embodiment of an online testing device for a power electronic transformer power module of the present invention. An online test device for power electronic transformer power modules, which includes a host computer system, a first power module, a second power module and a DC voltage source, the low-voltage side of the first power module and the low-voltage side of the second power module are connected in parallel at the DC voltage At both ends of the source, an inductor L is connected in series between the positive pole of the high-voltage side of the first power module and the positive pole of the high-voltage side of the second power module, and the negative pole of the high-voltage side of the first power module is connected with the negative pole of the high-voltage side of the second power module through a wire , both the first power module and the second power module are in communication connection with the upper computer system.

[00...

Embodiment 2

[0039] An embodiment of the invention relates to an online testing method for a power electronic transformer power module. An online testing method for a power electronic transformer power module, specifically comprising the following specific steps:

[0040] S1. Assemble and connect the online test device, and the upper computer system adjusts the threshold value of the signal command sent by it according to the inherent parameters of the first power module and the second power module;

[0041] S2. Set the first power module and the second power module as the module under test and the module under test respectively according to the test requirements;

[0042] S3. The upper computer system sends corresponding signal instructions to the tested module and accompanying module according to different test tasks and records the uploaded information;

[0043] S4. After the test time is reached, the upper computer system sends a signal command to turn off the DC voltage source and co...

Embodiment 3

[0051] This embodiment is similar to Embodiment 2, except that step 3 includes the following specific steps:

[0052] S31. Turn on the DC voltage source, and gradually adjust it to the normal working voltage of the low voltage side of the first power module and the second power module;

[0053] S32. The host computer system issues a power command to the module under test, gradually increasing from zero to positive rated power, and observe whether the voltage and current of the high-voltage side and low-voltage side of the module under test can follow the set command through the host computer system; In the host computer system, change the power command of the module under test to negative rated power, and observe whether the voltage and current of the high-voltage side and low-voltage side of the module under test can follow the set command to change to the rated value;

[0054] S33. The upper computer system keeps the power command of the module under test at the rated value,...

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Abstract

The invention provides an online testing device for power module of a power electronic transformer. The device comprises an upper computer system, a first power module, a second power module and a direct-current voltage source, and the low-voltage side of the first power module and the low-voltage side of the second power module are connected to the two ends of the direct-current voltage source inparallel. An inductor L is connected in series between a positive electrode of the high-voltage side of the first power module and a positive electrode of the high-voltage side of the second power module, and the negative electrode of the high-voltage side of the first power module is connected with the negative electrode of the high-voltage side of the second power module through a wire. And thefirst power module and the second power module are in communication connection with the upper computer system. The invention further provides an online testing method for the power module of the power electronic transformer. The test power supply loss is small, the test operation is simple, and the problem that a previous test platform and a previous test method are insufficient in power module test is solved.

Description

technical field [0001] The present invention relates to the technical field of power electronic transformer power modules, and more specifically, to an online testing device and method for power electronic transformer power modules. Background technique [0002] With the development of power electronics technology and semiconductor technology, a large number of AC-DC hybrid power distribution systems have appeared in the power system, such as AC-DC hybrid micro-grids, electric vehicle charging stations, data center power supply systems, etc., among which, those responsible for power conversion The main equipment is the power electronic transformer (PET). PET is composed of a large number of power modules cascaded in series and parallel. The reliability of power modules is the key to the safe and stable operation of PET. Therefore, strict, comprehensive and accurate testing of power modules is a prerequisite for safe operation of PET. [0003] The existing PET power module t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01D21/02
CPCG01R31/00G01D21/02
Inventor 肖立军曹安瑛何伟梁静王力伟万新宇莫凡程槐号邓载韬韩玉龙郝翔黄浪耿志清刘韬于向恩
Owner GUANGDONG POWER GRID CO LTD
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