System and method for controlling direct power of open-winding brushless double-fed wind driven generator

Abstract

The invention provides a system for controlling direct power of an open-winding brushless double-fed wind driven generator. The system is characterized by comprising a wind turbine, the brushless double-fed wind driven generator, a bidirectional pulse-width modulation (PWM) frequency converter and a central processing unit, wherein the wind turbine is connected with the brushless double-fed wind driven generator through a gearbox, the brushless double-fed wind driven generator is connected with the bidirectional PWM frequency converter, is connected with a transformer through a grid-connected switch and is connected with the central processing unit through a voltage and current signal detection unit and an input quantity unit sequentially, the bidirectional PWM frequency converter is connected with the transformer through a filter, and the transformer is connected with a power grid. The system for controlling direct power of the composite rotor open-winding brushless double-fed wind driven generator is simple in structure, low in cost and high in operation performance and wind power conversion efficiency.

Description

technical field [0001] The invention belongs to the field of wind power generation, and in particular relates to a direct power control system and method of an open-winding brushless double-fed wind power generator. Background technique [0002] In recent years, brushless doubly-fed generators have won domestic and international attention in the field of large wind turbines and offshore wind power due to their advantages such as brushless reliability, easy realization of variable speed constant frequency and low speed direct drive, small required converter capacity, and low cost. It has attracted more and more attention from foreign scholars and has broad application prospects. But it has not been popularized and applied in a large number, and its main technical problems are two aspects: (1) The rotor structure of the current brushless doubly-fed generator (basic types include special cage rotor or tooth harmonic wound rotor, and reluctance type The coupling ability of th...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides an open-winding brushless doubly-fed wind generator direct power control system and method, the purpose of which is to solve the system robustness existing in the previous method Low cost, high cost, and the sensitivity of the flux observer to parameters lead to poor real-time performance of the control system

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