不平衡负载下并联有源电力滤波器的控制策略

针对工业现场存在的不平衡负载(包括线性负载和非线性负载)导致的电网电压畸变和不平衡，在瞬时无功功率理论基础上，提出2种新检测算法及2/2变换矩阵，物理意义明确，可实时准确地分离出基波正序、基波负序及各次谐波电流，实现有源电力滤波器补偿策略的灵活选择--既可只补偿高次谐波和基波无功，充分利用有源电力滤波器的容量；亦可在容量许可的情况下同时补偿高次谐波、无功及基波负序。Matlab仿真研究和实验结果表明该算法的可行性。

Control Scheme for Three-phase Three-wire Shunt Active Power Filter With Unbalanced Loads

To solve the voltage distortion and unbalance resulting form the unbalanced loads in industrial applications, two novel extracting methods and 2/2 transformation matrix based on the instantaneous reactive power theory were proposed. The positive sequence, negative sequence current of fundamental frequency, and the high order harmonic current can be extracted by the APF (active power filter) correctly and timely. The compensation scheme of APF also can get flexibly choose according to the rated capacity of APF, namely not only could compensate the high order harmonic and the fundamental frequency negative current for fully utilizing the capacity of APF, but also could compensate the high order harmonic, the fundamental frequency negative current and the fundamental frequency negative sequence simultaneously under the rated capacity of APF. The feasibility of the algorithm is verified by Matlab simulation and experimental results.