Study Of Grid-side Converter For MW Variable Speed Constant Frequency Doubly-fed Wind Power Generation System

It is of great significant to develop wind power,which is renewable and without pollution when energy resource scarcity and environment pollution is more serious. Researches on the technology of high-power wind power generation become hotspot. This paper mainly studies the grid-side converter applied to MW doubly-fed wind power generation system.It analyses the theory of grid-side converter,builds up its mathematic model in d-q coordinate,introduces the control strategy based on voltage and current doubly closed-loop and gives the calculation method of PI regulator parameters.The design methods of grid-side inductor and LCL-filter applied to grid-side converter are presented.This paper discussed the control strategy on the condition of asymmetry power system and provides the means of eliminating the negative-sequence current.This paper builds up the simulation model in Matlab/Simulink to complete the simulation analysis.The results illustrate that the methods presented in this paper are able to get good characteristics of grid-side converter for MW wind power system,as provide reliable reference to practical engineering.