基于估计的风力机最大功率跟踪控制

Maximum Wind Power Tracking Based on Estimation

摘要:

在额定风速以下,变速恒频风力发电机组应采用可靠控制策略,保证最大风功率跟踪；在不估计风速的情况下,提出一种风力机最大功率跟踪方法；首先,利用状态观测器和非线性扩展卡尔曼滤波,估计风力机最佳转速,采用PI控制器给出风力机转矩估值；其次,以风力机转矩、转速估值为输入,采用风力机转矩前馈控制,在计算风力机最优转速后,给出发电机转矩控制量,从而实现低风速时的最大功率跟踪；在Matlab/Simulink软件上搭建了仿真平台,仿真验证了估计的有效性和控制的正确性。

Abstract:

Below the rated wind speed, variable speed constant frequency wind turbine should be reliably controlled to ensure the maximum wind power tracking. Without estimating the wind, this paper put forward a kind of wind turbine maximum power tracking method, firstly, by using the extended Calman filter to estimate wind turbine speed, a PI controller is used, wind turbine torque estimation is given, secondly, torque feed forward controller which wind turbine torque and speed estimation are the input is used to control the generator torque, to achieve maximum power tracking of low wind speed. Simulation platform is built in Matlab/Simulink software, the simulation verifies the effective of estimation and the correctness of control.