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对谐波/间谐波统一补偿的单相有源电力滤波器(active power filter,APF)系统进行了瞬时功率分析,研究了电网侧、APF主电路、负载侧之间的功率流动,证明了在不考虑APF主电路损耗的情况下,其直流侧功率波动具有周期性。推导了统一补偿的单相并联型APF的无源性控制策略方程,并针对其欠激励特性及直流侧功率波动的周期性设计了直流侧电压的间接控制。然后,针对其启动中遇到的问题,从功率平衡角度进行了分析并提出了解决方法。Matlab仿真实验结果验证了理论分析的正确性。
The instantaneous power analysis of the single-phase active power filter (APF) system with uniform compensation of harmonics and interharmonics was carried out. The power flow between the grid side, APF main circuit and load side was studied. Without considering the APF main circuit loss, the DC power fluctuation is periodic. The single-phase parallel APF passive control strategy equation is deduced. The indirect control of DC voltage is designed for the under-excitation characteristics and the periodicity of DC power fluctuation. Then, in view of the problems encountered in its startup, it analyzes and proposes solutions from the perspective of power balance. Matlab simulation results verify the correctness of theoretical analysis.