Research on Direct Torque Control of Doubly-Fed Generator Based on DSP Technology

Abstract

Doubly-fed VSCF wind power generator has become the main machine because it can improve the efficiency of wind power and obtain the optimal energy output at rated wind speed. In the control of excitation on double fed generator,the technique of direct torque control become the mostly method.This paper adopts voltage space vectors subdivision technology of direct torque control technology that can improve the low frequency characteristic,and structure the experiment system based on DSP. The result indicated the project is feasiblIntroduction Wind power as a kind of green energy has attracted more and more attention. in recent years, wind power technology has made rapid development. Double-fed generator becoming the main type of wind power generator because of its capture wind energy efficiency at rated wind speed. At present, foreign countries have successfully applied direct torque control ( DTC ) technique in VSCF doubly-fed wind power generator, Whereas DTC exist the problems of low frequency excitation current aberrance and output torque ripple. Therefore, this paper puts forward the space vectors subdivision method to improve the low-frequency characteristicbased on the traditional direct torque control of doubly-fed generator, And structure the doubly-fed generator direct torque control experimental platform about the digital signal processor ( DSP ), realize the grid-connected power generation.