基于滑模控制算法的风电系统变速变桨距控制研究

为改善系统恒功率输出运行区域内的动态性能,基于趋近律方法设计了滑模多变量控制器,将发电机转矩加入风电系统与桨距角同时调节,不但能保证发电机功率和转速稳定在额定值附近,而且可以降低传动系统扭转力矩波动和桨距角活动频率,在提高风电电能质量的同时可以减少系统机械部分的压力.最后利用M atlab对高风速下系统多变量与单变量控制策略进行了仿真对比,突出多变量控制策略的优越性;并将提出的滑模控制与PI控制进行仿真对比分析,以验证本文控制算法的有效性.

Study of Variable Speed Variable Pitch Controller for Wind Power Generation Systems Based on Sliding Mode Control

To improve the dynamic performance in the operation region of constant power output,multivariable control strategy using a sliding mode control technique is proposed by the reaching law method,adding the generator torque as the other control variable of wind power generation system with blade pitch angle to be controlled simultaneously.The addition of generator torque control can not only guarantee generator power and generator speed stable around its rated value,but minimize torsional torque fluctuations in the drive train and pitch actuator activity,and improve the quality of the electrical power and reduce the pressure of the mechanical parts of the system at the same time.Multivariable and monovariable control strategy under high wind speed are simulated on Matlab,the comparison results highlight the advantages of multivariable control strategy.The performance of the proposed SMC strategy is simulated and compared with PI control method,verifying the validity of control algorithm.