Direct current supporting capacitor testing device for outputting alternating current and direct current composite voltage

Abstract

The invention discloses a direct current supporting capacitor testing device for outputting alternating current and direct current composite voltage. The device comprises an alternating current voltage output module and a direct current voltage output module; the alternating current voltage output module and the direct current voltage output module are connected in parallel to form a parallel port; one end of the parallel port is connected with a direct current supporting capacitor to be tested, and the other end of the parallel port is grounded; the alternating current voltage output module is used for outputting alternating voltage with adjustable amplitude and frequency; and the direct current voltage output module is used for outputting direct current voltage with adjustable amplitudeand boosting rate. The direct current supporting capacitor testing device can output alternating current and direct current composite voltage, can also output single direct current or alternating current voltage, and accords with the actual operation working condition of the direct current support capacitor; and meanwhile, the amplitude and the frequency of the output alternating current voltage can be adjusted, and the amplitude and the boosting rate of the direct current voltage can also be adjusted, so that the performance parameters of the capacitor which are as close to the actual engineering as possible are obtained, and the reliability of the testing performance of the direct current supporting capacitor is improved.

Description

technical field [0001] The invention belongs to the field of high-voltage electric engineering, and more specifically relates to a test device for a DC support capacitor that outputs an AC-DC composite voltage. Background technique [0002] As the core components of DC transmission converter valves, wind power converters and other equipment, the DC support capacitor plays an important role in stabilizing the DC side voltage, providing energy regulation when the load changes, compensating reactive power, reducing voltage overshoot and instantaneous overvoltage, etc. effect. In the failure of the converter, more than 20% of the faults are caused by the failure of the DC support capacitor. It can be said that the DC support capacitor is one of the most vulnerable components in the converter. The breakdown of the DC support capacitor and the aging caused A decrease in capacitance will affect the overall operation of the converter. Therefore, in order to ensure that the convert...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a DC support capacitor testing device that outputs an AC-DC composite voltage, aiming to solve the problem that the existing test device can only output a single DC voltage or AC voltage, resulting in the failure of the DC support capacitor. The problem that the test performance does not match the actual application of the project

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