一种APF模糊自适应可变环宽滞环控制器

摘要

To overcome the drawback of the conventional hysteresis control, which has high switching frequency and wide frequency range in the inverter, a novel fuzzy adaptive hysteresis band current controller for active power filter is proposed. As the hysteresis band of the hysteresis current controller can adapt variety of the current and voltage deviation, the switching frequency and switch frequency range can be reduced effectively. The principle of the adaptive hysteresis band current controller is introduced, and the design of the fuzzy adaptive hysteresis band current controller is analyzed in detail. The simulation results of the conventional hysteresis control, adaptive variable hysteresis band control and fuzzy adaptive variable hysteresis band control show that the proposed method can reduce the switching frequency and narrow the variation range, and meet the requirements of the performance of high precision and real time for harmonics compensation of three-phase active power filters. This work is supported by National Natural Science Foundation of China (No. 60674057).%为改善常规滞环控制方式逆变器开关频率高且频率变化范围大的缺陷,提出了一种基于模糊自适应可变环宽的滞环电流控制方式.由于滞环宽度随给定信号及电压的变化而自动调整,故可有效地减小开关频率及频率的变化范围.简要说明了自适应可变环宽的滞环电流控制方式的工作原理,详细地给出了模糊自适应可变环宽控制器的设计方法.通过对常规滞环控制方式、自适应可变环宽滞环控制方式及模糊自适应可变环宽的滞环控制方式的仿真研究,结果表明,所提方法有效地降低了开关频率,减小了开关频率的变化范围.由此构成的三相有源电力滤波器能很好地满足对谐波补偿的高精度和实时性的要求.