风力发电并网逆变器预测电流控制方法研究

Research on Predicted Current Control for Grid Inverter in Wind Power Generation

建立了风力发电变流系统中三相电压型并网逆变器的数学模型,采用两相静止坐标系下预测电流控制的方法对其进行控制。该方法将周期内的电流误差转化为电压信号,作为电压空间矢量脉宽调制的给定,令下一周期实际电流跟踪参考电流,从而使逆变器具有快速的动态响应,实现了高功率因数,获得稳定的输出电压。仿真和实验结果验证了该方法的正确性和可行性。

This paper establishes mathematic model of three-phase voltage source grid inverter in wind power genera-tion.The inverter is controlled by the method of predictive current control in static two-phase coordinates.In the method,the current difference of this cycle is transformed to voltage signal as input of SVPWM,so as to force the current of next cycle follow the track of reference.As a result,the inverter has the features of fast dynamic response,high power factor,and stable output voltage.The simulation and experimental results show that the method is valid and feasible.