基于反馈线性化的液压型风力发电机组最佳功率追踪控制

液压型风力发电机组在额定风速以下时为获得最多电能,需随风速变化追踪最佳功率点.建立并网液压型风力发电机组仿射非线性数学模型,基于反馈线性化方法,分别以风力机转速和液压系统传输功率为输出,以变量马达摆角为控制输入,线性化系统,设计最佳转速与最佳功率追踪控制器,实现机组在额定风速以下随风速变化输出最佳功率.仿真结果表明,以液压系统传输功率为控制输出的功率追踪过程动静态特性较好.理论分析表明,控制器中高压腔压力变化率是否可以规划,是影响功率追踪过程稳定性的关键因素.

Maximum power point tracking control of hydraulic type wind turbine based on feedback linearization

To maximize the extracted power from varying wind energy, the hydraulic type wind turbine needs to track the maximum power point when the wind speed is below the rated value. We first build an affine nonlinear mathematical model for the grid-connected hydraulic type wind turbine, then linearize the system and design the optimal speed and optimal power tracking controllers based on the feedback linearization method, with both the speed of wind turbine and the power of the hydraulic transmission as outputs, and with the variable motor swing angle as the control input, realizing the optimal power tracking when the wind speed is below the rated value. The simulation results show that the system is with excellent performance when using the power of hydraulic transmission as output. The theoretical analysis shows that whether the pressure change rate of the controller can be planned is the key factor that affects the tracking stability of the system.