Abstract：This paper investigated the maximum power point tracking (MPPT) strategy for wind energy conversion system (WECS), where a direct-driven permanent magnet synchronous generator (PMSG) was involved. To achieve above target, a variable step Hill Climbing Searching Method was proposed, which improved the static tracking error and dynamic response of maximum wind power. In addition, to simply the torque control of PMSG drive, Filed oriented control was adopted, and the optimal torque reference can be directly inferred by MPPT algorithm. Improvements of this algorithm included attenuating step length of q-axis current to reduce power oscillation and initializing this step length to track the new maximum power when a sudden change of wind speed emerged. During this process, the maximum power point was identified by comparing slopes of wind power curve at current and previous time instants, whereas the change of wind speed was detected by comparing variation of wind power with a threshold value set dynamically and periodically. Because of using no wind speed sensors, the proposed method is easy to implement. Simulations of WECS were performed by the Matlab/Simulink software, and hardware was tested as well. Both of the results confirmed the effectiveness of the proposed MPPT algorithm, and it also demonstrated a good potential to be applied in engineering
田兵, 赵克, 孙东阳, 段建东, 孙力. 改进型变步长最大功率跟踪算法在风力发电系统中的应用[J]. 电工技术学报, 2016, 31(6): 226-233.
Tian Bing, Zhao Ke, Sun Dondyang, Duan Jiandong, Sun Li. Promoted Variable Step Maximum Power Point Tracking Algorithm Used in the Wind Energy Conversion System. Transactions of China Electrotechnical Society, 2016, 31(6): 226-233.
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2016, Vol. 31 
