The new pitch angle controller is designed for squirrel-cage induction generator (SCIG) wind power generation system by using sliding mode control method. Firstly, wind turbine generation (WTG) model is established by using the state variables of angular speed of windmill rotor, wind speed, pitch angle and so on. Secondly, the sliding mode pitch angle controller is designed making use of the constant reaching law which keep the output power of WTG at the rated power. Then, the proposed method is compared with traditional PID pitch angle controller via matlab software. The simulation results show that the system has more rapid and robust response and little deviations.

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In this paper, a frequency control method is introduced for wind-diesel hybrid system by using a sliding mode controller and a Super-Capacitor energy storage system to reduce frequency deviations. By means of the proposed method, output power control of WTG system considering the conditions of power utilities and maximizing energy capture are achieved. The proposed method is compared with the conventional method of diesel speed control strategy, the simulation results show that proposed method is effective to reduce the frequency deviation of isolated power system.