Design Of Fuzzy Control For The MW Grade Wind Turbines

As an important problem of economic development, resourcse is an urgent problem of human survival and development. A series of serious circumstance problems was caused by the limitation of conventional resources, threatened the survival and development. So exploiting and using the new energy became an important component of the world energy continuable development strategy. Wind power is one of the new energy which has great development potentiality. For its cleanness, no pollution, technique mature, great single capacitance, shot buliding cycles, wind power has better economy and society benefit, so it is paid high attention.By the rapid development of computer and automatic control, wind power generator technology has developed very rapidly. Single capacitance developed from several tens of KW initial to MW grade now, and the control way developed from active stall to pitch control, and now variable speeed control.Yaw control and variable pitch control has been attracted more and more attentions to obtain the most utilize.To realize yaw control and variable pitch control, Control way of variable speeed constant frequency wind power generation is studied and controller was designed.In order to compensate and restrain disturbances and uncertainty in the control of yaw of wind turbine, disturbance observer was designed. At the same time, double mode subsection was designed to have a better tracking effect and dynamic characteristic. Proportion control was chosen in the case of big tracking warp compared to Fuzzy-PD control in the case of small tracking warp. The result of simulation shows that, by means of disturbance observer and double mode subsection control, yaw system still has a better tracking characteristic under the disturbances and uncertainty.Fuzzy controllers were designed for the different influences that variable wind causes utilization rate and for the models difficult builded. To sustain the output power constant, the blade azimuth angle was controlled when high speed. To sustained best, wind turbines velocity was controlled when the speed low, the output power is kept around maxmum, and the utilization rate was improved.