Excitation control device of brushless doubly-fed motor independent power generation system

Abstract

The invention provides an excitation control device of a brushless doubly-fed motor independent power generation system and belongs to a power generation control device for a brushless doubly-fed motor. According to the technical scheme of the invention, the defects in the prior art that, an existing scalar control method is poor in dynamic performance and a conventional bisynchronous rotating reference frame is complicated in vector control, high in cost and low in efficiency can be overcome. According to the technical scheme of the invention, the device comprises a PW voltage magnitude controller, a PW voltage frequency controller, a CW current vector controller, an LC filter, a rotating speed calculator, a CW current frequency feed-forward amount calculator, a PW voltage phase-locked loop and a PW current converter. The CW current vector controller of a brushless doubly-fed motor is adopted as an inner ring, while the PW voltage magnitude controller and the PW voltage frequency controller of the brushless doubly-fed motor are adopted as an outer ring. In this way, the PW voltage magnitude and the PW voltage frequency are independently controlled. Meanwhile, a cross feed-forward compensation mechanism is adopted in the CW current vector controller, so that the device is faster in response rate and better in stability precision. The constant-frequency and constant-voltage generating function of the brushless doubly-fed motor independent power generation system in the speed-varying and load-varying condition is realized.

Description

Technical field [0001] The invention belongs to a brushless doubly-fed motor power generation control device, and specifically relates to an excitation control device of a brushless doubly-fed motor independent power generation system. Background technique [0002] The brushless doubly-fed motor is a new type of AC induction motor developed in recent years. Compared with the brushed doubly-fed motor, the brushless doubly-fed motor eliminates the brush and slip ring, and has the advantages of simple structure and high reliability. It can realize independent power generation and grid-connected power generation, and has significant application advantages in the fields of ship shaft power generation, wind power generation, and hydropower generation. The brushless doubly-fed motor has two sets of stator windings with different pole pairs and a special rotor. These two sets of stator windings are called power winding (PW) and control winding (CW). There is no direct electrical connect...

AI Technical Summary

Problems solved by technology

[0011] The invention proposes an excitation control device for an independent power generation system of a brushless doubly-fed motor, which overcomes the defects of poor dynamic performance of the existing scalar control method and complex, high cost and low efficiency of the dual synchronous rotating coordinate system vector control method, so as to realize no Constant frequency and constant voltage power generation function of brush doubly-fed motor independent power generation system under variable speed and variable load operating conditions

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