On-line designed hybrid controller with adaptive observer for variable-speed wind generation system |
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Authors: | Whei-Min Lin Chih-Ming Hong Fu-Sheng Cheng |
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Affiliation: | 1. Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, ROC;2. Department of Electrical Engineering, Cheng-Shiu University, Kaohsiung 83347, Taiwan, ROC |
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Abstract: | This paper presents a wind-driven induction generator system with a hybrid controller, which combines the advantages of the integral–proportional and the sliding mode controllers. The proposed controller is designed to adjust the turbine speed to extract maximum power from the wind. The integral–proportional speed controller can be designed on-line according to the estimated rotor parameters, and the observed disturbance torque is feed-forward to increase the robustness of the system. The designed integral switching surface with integral–proportional due to on-line tuning produced a new sliding surface to implement the control, and can ensure the robustness under noisy environment. The rotor inertia constant, friction constant, and the disturbed mechanical torque of the induction generator are estimated by a proposed adaptive observer, which is composed of the recursive least square algorithm and a torque observer. |
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Keywords: | Sliding mode control Adaptive observer Wind turbine Wind energy conversion system Induction generator |
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