Convertor assembly used for timing wind generator set

Abstract

The invention relates to a deflector used in a speed adjustable wind motor set, comprising a rectification circuit. The invention is characterized in that: the rectification circuit is connected with a silicon-controlled line commutated inverter or a silicon-controlled line commutated inverting circuit combined by more than one silicon-controlled line commutated inverters through series-parallel connection, and a DC reactor is connected in the silicon-controlled line commutated inverting circuit in series. The invention has the advantages that: after the reflector is used, a generator is operated in one quadrant, the generator can only work in generating state but can not work in electromotion state, electric energy can only flow in one direction, that is to say, the electric energy flows to a reflector from the generator, and then is transmitted to electric grid.

Description

technical field [0001] The invention relates to a flow conversion device used in an adjustable-speed wind turbine. Background of the invention [0002] Adjustable-speed wind turbines, also known as variable-speed constant-frequency wind turbines, currently use wound-type double-fed asynchronous generators and permanent magnet synchronous generators as generators for variable-speed constant-frequency wind turbines. Compared with squirrel-cage asynchronous generators, doubly-fed generators have complex structures, slip rings, are expensive, and require a lot of maintenance. Squirrel-cage generators are the simplest generators, fixed-pitch stall-type wind turbine generators Squirrel-cage generators are usually used, but fixed-pitch stall-type wind turbines have no converter devices and are not speed-adjustable. At present, the converter devices of adjustable-speed doubly-fed generator wind turbines and permanent magnet synchronous generator wind turbines mainly use dual-PWM co...

AI Technical Summary

Problems solved by technology

Compared with squirrel-cage asynchronous generators, doubly-fed generators have complex structures, slip rings, are expensive, and require a lot of maintenance. Squirrel-cage generators are the simplest generators, fixed-pitch stall-type wind turbine generators Squirrel-cage generators are usually used, but fixed-pitch stall-type wind turbines have no converter devices and are not speed-adjustable

At present, the converter devices of adjustable-speed doubly-fed generator wind turbines and permanent magnet synchronous generator wind turbines mainly use dual-PWM converters with four-quadrant operation, and their grid-side converters and motor-side converters are fully controlled. Type devices, operating in PWM mode, the wind turbine generator with four-quadrant converter has the disadvantage that it may run in the motoring state. When the generator is running in the motoring state, the wind turbine does not send power to the grid but absorbs power from the grid.

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