基于功率平衡原理的单相串联有源电力滤波器

提出一种基于功率平衡原理的串联型有源电力滤波器(APF)。在分析串联型有源电力滤波器功率平衡特点的基础上，导出基于功率平衡的串联APF的控制策略和控制方程，分析了串联APF直流侧电压的确定原则和设计公式。所推荐的控制方式不需要进行复杂的基波检测和计算，只需要检测APF直流侧电容电压和电源输出电流，仅用简单的模拟电路就可以实现，可以同时补偿谐波和无功电流。仿真结果表明基于功率平衡原理的串联型APF对电压型谐波源具有较好的补偿效果，证明了理论分析的正确性。

A novel single-phase series active power filter with power equilibrium

Grounded on the theory of power equilibrium, a novel single-phase series active power filter (APF) is proposed in this paper. By analyzing the power equilibrium character of series APF, the control algorithm and equation are deduced, the selection criteria of capacitor voltage on the d.c. side and the design formula of APF are also given out. In the proposed control strategy, instead of the fundamental current detection and complex computation, only the capacitance voltage and the source current on d.c. side are needed. The clear control loop has been realized with simple circuit and the proposed series APF can compensate both reactive and harmonic current simultaneously. The simulation results show the excellent compensation effect and confirm the validity of theoretical analysis.