LCL滤波的并联有源滤波器的虚拟阻尼控制

Virtual Resistor Control Strategy of Parallel Active Power Filter with LCL Filter

为实现LCL滤波器的稳定控制而不额外增加系统损耗,提出了基于虚拟阻尼思想的有源滤波器输出并网电流控制策略,通过并网侧电感电流外环控制器的引入充分提高了系统的鲁棒性,即使电网存在畸变系统也能有效工作,而且可以有效控制补偿电流的精度,通过电容电流或电容电压内环来实现系统的稳定。该控制方法具有较好的谐波补偿精度和开关纹波衰减率,系统具有良好的稳态和动态性能。仿真结果证明了所提出的控制策略的正确性。

LCL filter,as a three-order one,is difficult to be stable. The active damping can effectively achieve the stable control instead of using damping resistance,and can effectively improve the efficiency of the system. We proposed a robust strategy for regulating the grid current entering grid from a shunt active power filter connected via a LCL filter. The strategy integrates an outer loop grid current regulator with inner capacitor current regulation or capacitor voltage regulation to stabilize the system. Based on this double-loop control scheme,high quality steady-state grid current waveform and fast-dynamic response can be obtained. Finally simulation validates the correction of the proposed control strategy.