| Energy and environment is the human survival and development of the pressing problems which should be solved. With coal, oil and natural gas mainly of conventional energy sources, it not only limited resources, and caused serious air pollution. Wind energy is one of the cleanest energy, has become the human society sustainable development today one of major new power source.The technology of doubly-fed Variable speed constant frequency wind power breaking the traditional idea, and make the synchronous generator speed is no longer subject to power grid, and the constant frequencies limit the output voltage power generator issued the amplitude and phase current will not endure the influence of rotor speed, make the generator rotor and grid from "rigid connection" to "flexible connection", Meanwhile, due to the excitation frequency converter in the rotor with capacity small, low cost advantage, therefore, by doubly-fed induction generator(DFIG) consisting of variable speed constant frequency wind power system has become the international wind power development trend and research focus, have good development prospect, its object characteristics and control technology is also the focus of research in this paper.This thesis mainly researches the DFIG wind power system and yaw system. In this paper, the basis of theoretical analysis Doubly-Fed type WTG, get the mathematical model and the control strategy, of DFIG and double PWM converter, use toolbox simulink of MATLAB established their simulation model, And on the system control strategy are the direct each control simulation and analysis, adjust, can intuitive observing the whole wind power generation system performance, energy conversion efficiency and power quality. Aimed at the yaw system, chose the control effect is better Fuzzy control as its control method, use Fuzzy toolbox of MATLAB, establishing its Fuzzy controller with simulink toolbox. The simulation results show that the yaw control system acquired better control effect. |
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