模糊控制在离网风力发电最大风能捕获中的应用

摘要

To solve the problem of the tracking speed versus control efficiency trade off problem of the hill climb search(HCS) method, an adaptive variable step search algorithm realized by fuzzy PID is applied. Based on the equivalent circuit analysis of the wind energy conversion system (WECS), a speed-sensorless control scheme has been developed. A 5kW stand alone WECS was analyzed in the Simulink. The results show that the proposed algorithm has better dynamic performance and capture more power than the conventional HCS under constant wind and variable wind.%研究了一种模糊PID实现的自调整变步长算法，解决了爬山算法动态响应速度与稳态精度相矛盾的问题。分析了离网风力发电系统数学模型，建立了不测转速的控制结构。在Simulink平台上对一个5kW离网风电系统进行了仿真分析。结果表明，在平稳风速以及组合风速下，该算法均能有效提高跟踪速度，捕获更多功率。