基于混沌优化PID风力发电机组变桨距系统研究

Study on variable-pitch control system of wind turbine base on chaos optimized PID parameter

变桨距控制是永磁直驱同步风力发电系统在额定风速以上限制功率输出的主要控制手段,文章基于风力机功率输出特性曲线,分析了永磁直驱风力发电系统变桨距控制在全风况下对应的控制策略。在额定风速以上时利用转速和功率相结合的双闭环变桨距控制系统,并在传统的PID控制器的基础上运用了混沌优化技术,用来减小在额定风速附近引起的输出功率波动及载荷突变的不利影响。通过Matlab仿真软件对混沌优化变桨距进行验证,仿真结果表明该变桨距控制策略响应速度快且鲁棒性强。

Pitch angle control is main method to restrict output power of direct-drive permanent mag- net synchronous wind power system when wind speed exceeds rated value. All pitch control strategies within the range of wind speed are analyzed base on the wind turbine output power curve. The double closed loop pitch angle control system combined power and rotation speed is used while wind speed is above rating, and a tradition PID controller with chaos optimization is used to reduce adverse effect caused by power fluctuation and load break around specified wind speed. The optimized control system is verified by Matlab simulation software. The results show that control strategy has advantage of quick response and robust.