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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。
In order to realize the stable control of LCL filter without increasing the system loss, the control strategy of active filter output grid current based on virtual damping is proposed. By introducing the external loop controller of grid-side inductor current, Robust, even if there is distortion in the power grid system can work effectively, but also can effectively control the accuracy of the compensation current, through the capacitor current or capacitor voltage within the loop to achieve system stability. The control method has better harmonic compensation accuracy and switching ripple attenuation rate, the system has good steady-state and dynamic performance. Simulation results show the correctness of the proposed control strategy.