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提出一种改进的有源电力滤波器(APF)的电源电流直接控制方法。通过检测负载电流,利用负载电流检测结果进行前馈补偿校正并提取其中的有功电流作为APF控制器的参考值。同时,通过电网电压前馈和系统解耦,把电源电流直接控制的APF数学模型简化成一阶惯性环节。相对于把负载电流作为干扰不进行检测的电源电流直接控制方法,所述方法的比例—积分控制器在理论上就能做到无静差跟踪,并且具有更好的动态响应。仿真和实验证明了所提方法的优越性。
An improved direct current control method of APF is proposed. By detecting the load current, using the load current detection results for feedforward compensation correction and extract the active current which is used as the APF controller reference value. At the same time, APF mathematical model, which is directly controlled by power supply current, is simplified into first-order inertia by grid voltage feed-forward and system decoupling. Compared with the method of direct control of supply current which does not detect the load current as disturbance, the proportional-integral controller of this method can theoretically achieve no static tracking and has better dynamic response. Simulation and experiment prove the superiority of the proposed method.