Wind power converter, wind power system and IGBT fault test method

Abstract

The invention discloses a wind power converter, a wind power system and an IGBT fault test method. First ends of three-phase contactors of the wind power converter are connected with an electric reactor, and the electric reactor is connected to an output end of the wind power converter; two adjacent phases of the second end of the three-phase contactor are short-circuited together; a controller is used for controlling the three-phase contactor to be closed, so that a path is formed between different bridge arms where the IGBTs are located through the reactor and the three-phase contactor; and a driving signal is sent to an IGBT, and whether the IGBT breaks down or not is judged according to the current of the wind power converter. On-line fault testing can be carried out on the IGBT in the wind power converter; when test is needed, the contactor is controlled to be connected; when the test is not needed, the contactor is controlled to be disconnected in a simple way; and judgment can be carried out only through the current, and the mode is simple. and the IGBT waves are sent and tested one by one, so that whether each IGBT fails or not can be tested, and the testing efficiency is high.

Description

technical field [0001] The present application relates to the technical field of wind power generation, in particular to a method for fault testing of wind power converters, wind power systems and IGBTs. Background technique [0002] At present, with the shortage of global energy sources and the aggravation of environmental pollution, the application of wind power generation is becoming more and more extensive. The wind power generation system is called wind power system for short, and the most important equipment in the wind power system is the wind power converter. [0003] Wind power converters are AC-DC-AC converters, including machine-side converters and grid-side converters. The wind power converter is a bidirectional feed converter, which can feed power from the wind turbine to the grid, and can also feed power from the grid to the wind turbine. [0004] Power devices in wind power converters generally use insulated gate bipolar transistors (IGBTs, Insulated Gate Bi...

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Problems solved by technology

[0005] If offline testing is carried out for each module separately, due to the large number of modules, the workload is relatively large, and the delivery cycle of the wind power converter is prolonged, so the test efficiency is low

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