随着工业现场大量非线性负载的应用,电网电流波形畸变日益严重,提出了一种基于滑模控制器的有源电力滤波器(Active Power Filter,APF)指定次谐波补偿方法。该方法首先利用坐标变换计算APF的参考电流,并通过将状态预测观测器引入到离散滑模控制器中,实现对系统状态参数的超前一拍预测,降低系统延时的影响。通过实验验证了该方法的正确性和有效性。
Abstract —— The doubly fed induction generator is particularly appropriate to be used in wind power generation systems. However, in weak grids its stator connection to unbalanced or distorted voltages imposes low frequency and high amplitude rotor current harmonics. Also, the grid side converter must deal with the same voltage conditions. The paper addresses the first issue presenting a voltage harmonics controller in the dq reference frame to be included in the high dynamics rotor current controller. Simulation and experimental results demonstrate the performance of the proposed controller imposing a sinusoidal input current.