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对有源电力滤波器(APF)能量流进行分析,得出决定APF容量的基本要素。针对复杂电源环境下APF的补偿目标,提出一种基于电源电流基波正弦化的降低容量控制策略,获取负载电流中的基波有功功率及基波无功功率,并获得补偿参考电流。为实现控制策略,提出适用于电源电压畸变情况下的三相电压基波正序检测的改进方法,减小APF变流电路总电流和自身损耗,提高了APF的效率。仿真和实验结果验证了该控制策略的正确性和有效性,对并联型APF的小型化及电力系统滤波改造具有实用的参考价值。
The analysis of the APF energy flow gives the basic elements that determine the capacity of the APF. Aiming at the compensation goal of APF in complex power supply environment, a reduction capacity control strategy based on the sine wave of power supply current is proposed. The fundamental active power and fundamental reactive power in load current are obtained and compensated reference current is obtained. In order to realize the control strategy, an improved method is proposed for detecting the positive sequence of fundamental voltage of three-phase voltage under the condition of power supply voltage distortion, which can reduce the total current and self-loss of APF converter circuit and improve the efficiency of APF. The simulation and experimental results verify the correctness and effectiveness of the control strategy and have practical value for the miniaturization of parallel APF and power system filtering and transformation.