有源电力滤波器相电流互感器容错控制

摘要

为了实现有源电力滤波器(APF)在交流侧电流互感器故障状态下的可靠运行,提出一种基于相电流重构的交流侧电流互感器容错控制策略.通过分析相电流重构应用在滞环SVPWM控制中的不足,提出在相电流重构中设计状态观测器.构建有源电力滤波器的电流闭环观测模型,用观测出的电流值来对存在缺失的重构电流进行修正,解决了相电流重构技术运用在滞环 SVPWM 控制中重构电流不完全的问题,实现了 APF 系统的带故障运行.在Matlab/Simulink中进行仿真验证,并在实验样机中进行实验,结果均证明了该容错策略的正确性和可行性.%In order to achieve the reliable operation of active power filter (APF) in the AC side current transformer fault state, a fault-tolerant control strategy based on the phase current reconstruction of AC side current transformer is proposed. By analyzing the deficiencies of phase current reconstruction based on hysteresis SVPWM control, the strategy of designing state observer in phase current reconstruction is proposed. This paper constructs the current closed-loop observation model of active power filter, and uses the observed current value to revise the missing reconstruction current to solve the problem of current reconstruction incompleteness in the phase current reconstruction techniques under hysteresis SVPWM control. Finally,the operation of the APF system under fault condition is realized. The results by both Matlab/Simulink and experiments in the experimental prototype demonstrate the correctness and feasibility of the method. This work is supported by Natural Science Foundation of Jiangsu Province (No. BK20130187).