Reseach On Control Of Converter Of Doubly-fed Wind Power Generation System

With the rapid development of industrial, the lack of general energy resource and environment pollution problems increasingly, wind power as a renewable clean energy is being paid attention to by most states in the world these years and it is developing quickly. Doubly-fed VSCF wind power generation technology with its low cost,high efficiency advantages becomes mainstream in wind power technology. The wind power generation technology also becomes the popular topic which various countries expert studies.This article is mainly discuss and research around doubly-fed matching,dual-PWM converter and its associated control technology which used in doubly-fed wind power generation system.At first, the paper introduced the current development situation about the world wind power and wind power generation technology; Analyzed VSCF wind-power system's basic principle as well as the doubly-fed wind power generation energy relations; then introduced the double-fed electrical machinery's mathematical model and simplification mathematical model after the coordinate transformation. It obtains the dual-PWM converter's characteristic and its control mode through research dual-PWM converter. This article has the detailed research on the Net-side converter's and machine-side converter's control mode in the system: in the Net-side, the control principle based on voltage-oriented vector control has been researched especially, proposing control mode of vector current control based on voltage space vector ; in the machine-side , the purpose of control mode is for maximum power point tracer. This paper give a new control mode which not according to the characteristic curve of wind turbine (wind speed-power-rotor speed curve).And at last built the simulation mode based on Matlab/simulink platform to verify the correctness of control strategy and the theoretical study.