Converter module function detection device and method

Abstract

The invention discloses a converter module function detection device and method, and the device comprises a power module, a signal switching unit and a signal detection unit. The output end of the power module is connected with the input end and the output end of a to-be-detected converter module through the signal switching unit, and the power module is used for performing path switching on the voltage output by the power supply module, so that the voltage can be randomly loaded to the input end or/and the output end of the converter to be tested; the input end of the signal detection unit is connected with the input end and the output end of the converter module to be detected, and the signal detection unit is used for detecting the input signals and output signals of the converter module to be detected and judging the detection signals to determine whether the converter has faults or not. The converter module function detection device and method have the advantages of being simple in structure, being safe and reliable, being small in occupied space, being easy and convenient to operate, being accurate in fault positioning and the like.

Description

technical field [0001] The invention mainly relates to the technical field of converter testing, in particular to a converter module function testing device and method. Background technique [0002] The traction converter on rail trains is a power conversion component that rectifies AC power into DC power and then inverts DC power into AC power, or directly inverts DC power into AC power. The AC power it outputs is sent to the traction motor on the train. The operation of the train provides an energy source, thereby driving the train to run. [0003] As the core component of rail train power system. The function of the traction converter will directly affect the operation and safety of the train. Therefore, in order to ensure the normal and stable function of the traction converter, the detection and maintenance of the converter is an essential work. [0004] The traction converter on the train is composed of: converter cabinet, converter module, power switching device, c...

AI Technical Summary

Problems solved by technology

[0005] 1) There are certain potential safety hazards in the high-voltage test and detection process of the converter;

[0006] If the converter is tested according to the conventional high-voltage test method, the DC voltage at the input terminal is generally between several hundred volts (such as DC750V) and several thousand volts (such as DC4000V) A, which will inevitably bring certain potential safety hazards.

[0007] 2) It is necessary to provide high-power testing equipment (including site and power supply issues) during the testing process of the converter on the application site; especially for the inspection and maintenance of the application site, the conventional high-voltage and high-power testing scheme requires the testing equipment to provide high-power power supply, Loads and other power devices not only need to occupy a large site space, but also have requirements for the power supply capacity of the test site, which consumes a lot of resources, resulting in high cost of testing and testing, and also seriously affects the testing efficiency of the converter

[0008] 3) The converter needs to be disassembled during testing;

[0009] Due to the large size, heavy weight and inconvenient power supply of the detection equipment in the conventional detection scheme (the system power supply is AC380V, and the power is large), the detection equipment itself is not easy to move, so when the converter needs to be tested, it needs to be The converter (or its internal core module) is dismantled from the train and transported to the test site where the test equipment is located to be tested. After the test, the converter (or its core module) will be reinstalled on the train. To a certain extent, it affects the test efficiency, and also brings a certain risk of product disassembly and assembly.

[0010] 4) It is difficult to detect the freewheeling diode in the converter module;

This detection scheme is not only inefficient, but also not conducive to the automatic generation of test reports, which has a certain impact on the objectivity of test results.

[0012] 5) The fault of the converter module cannot be accurately located;

Since the manual operation switch signal is a fixed high and low level signal, it cannot test the response characteristics of the IGBT to the frequency switch signal; and the above-mentioned low-voltage test method can only detect the reverse characteristic of the freewheeling diode (that is, whether there is a short circuit), and It is impossible to directly detect the forward characteristics of the freewheeling diode (that is, whether there is an open circuit), and there are more or less problems

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