LPV动态补偿的风能转换系统变桨距控制

摘要

When the wind speed exceeds its rated value, pitch angle is regulated to maintain the constant power output, and the mechanical oscillation of the wind energy conversion system(WECS) is reduced by controlling the electromagnetic torque to keep the generator speed at its rated value. The nonlinear mechanistic model for WECS is established. The linear parameter varying(LPV) system model is derived. Based on the multivariable(MV) control strategy, we employ the LPV gain scheduling technique to dynamically compensate the pitch angle and the electromagnetic torque. Experiment results based on the hardware-in-the-loop simulation platform for WECS show that the output power error is reduced by the compensation, and the fluctuation of the motor speed and torque are decreased, resulting in a better dynamic performance.%当风速超过额定值时,风能转换系统需要控制节距角来实现额定恒功率控制.同时控制电机电磁转矩使转速维持在其额定值以减少系统振荡.建立了风能转换系统的机理模型并得到其线性参数变化(LPV)系统模型;在多变量(MV)控制策略的基础上,设计了基于LPV模型的增益调度控制器,对节距角和电磁转矩进行动态补偿;基于dSPACE的风能转换系统硬件在回路仿真平台进行实验研究,结果表明补偿后系统的功率误差更小,电机转速及转矩的波动明显减小,体现了更好的动态性能.