Flexible direct-current power-transmission converter-valve half-bridge structure power module test device

Abstract

A flexible direct-current power-transmission converter-valve half-bridge structure power module test device comprises a primary loop and a secondary loop. The primary loop provides electrical connection for a converter-valve half-bridge structure power module test. The secondary loop is used for controlling the primary loop. The secondary loop and the primary loop are connected through a control monitoring plate card in a half-bridge structure power module in a flexible direct-current power-transmission converter valve. The primary loop comprises a company test side, a tested side and a load inductor. The company test side and the tested side are connected in series through the load inductor so as to form a closed loop. The company test side comprises one company test valve segment. The tested side comprises a plurality of tested valve segments. A structure of the company test valve segment and structures of the tested valve segments are the same and are formed through connecting half-bridge structure power modules with same quantities in series. The test device controls a module investment of the company test valve segment through a PWM modulation method. An initial value of a duty ratio of a control signal is 0 and then the value is increased slowly from a charging moment so as to limit an impact current during a charging process.

Description

technical field [0001] The invention relates to a test device for a flexible direct current transmission converter valve. Background technique [0002] The flexible HVDC converter valve is the core equipment of HVDC flexible power transmission, and the half-bridge structure power module is the smallest unit of the converter valve, which must pass various tests to ensure its reliable operation. Therefore, it is necessary to design a reasonable half-bridge structure power module test device to simulate various operating states that can occur during actual operation as much as possible, so as to test whether the design of the half-bridge structure power module meets the engineering requirements. [0003] At present, there are already some relevant domestic patents on the test device of the half-bridge structure power module of the flexible DC transmission converter valve, such as CN201310652351, CN201310407363, CN201210533984, etc. The main shortcomings of the half-bridge struc...

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Problems solved by technology

[0003] At present, there are already some relevant domestic patents on the test device of the half-bridge structure power module of the flexible DC transmission converter valve, such as CN201310652351, CN201310407363, CN201210533984, etc. The main shortcomings of the half-bridge structure power module test device proposed by these patents are: The test can only test one or a small number of power modules with half-bridge structure. For the actual project with a large number of power modules with half-bridge structure, the test process is time-consuming and requires frequent disassembly and assembly of power modules with half-bridge structure, which cannot be tested in batches. ; The circuit structure of the test device mentioned in the above-mentioned patent

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