Abstract：A unified overall power controller for variable-speed fixed-pitch wind turbines is proposed in this paper. The controller firstly searches the optimum power line using the hill-climbing maximum power point tracking(MPPT) strategy. Once the optimum power line is obtained, the controller turns to operate under power signal feedback MPPT mode to fasten the MPPT speed. Since the proposed power controller does not need the pre-knowledge of the wind turbine, it can realize unified MPPT control performance. In addition, the controller forces the turbine into stalling mode to limit the speed and power of the turbine by decreasing its speed. Thus, the overall power control within the whole wind velocity range is achieved. After elaborating the operational principle of the proposed controller, its effectiveness and correctness is verified through using the proposed method to wind energy conversion systems with different parameters. The simulation results support the theoretic analysis very well.
陈杰, 陈家伟, 龚春英. 变速风力发电系统统一功率控制策略研究[J]. 电工技术学报, 2014, 29(10): 256-265.
Chen Jie, Chen Jiawei, Gong Chunying. Research on a Unified MPPT Controller for Variable-Speed Wind Turbines. Transactions of China Electrotechnical Society, 2014, 29(10): 256-265.
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