并联有源电力滤波器空间矢量电流控制新方法

摘要

基于电压空间矢量分析原理,提出一种适用于并联型有源电力滤波器的电流控制方法.揭示了参考电流优化跟踪策略,该策略能保证在单个开关周期内,使误差电流矢量的幅值以最快的速度逼近于零,从而实现参考电流的快速跟踪.基于参考电流优化跟踪策略,在充分考虑逆变器的实际电压输出能力的情况下,对逆变器输出电压矢量进行精确计算,并通过在单位开关周期内输出多个基本电压矢量的方法合成该矢量,以保证误差电流微分矢量同时具有最优方向和最大幅值,从而在快速跟踪指令电流的同时,不会造成逆变器不可控,提高控制系统的快速性和可靠性.实验结果验证了所提方法的有效性.%A current control method based on the theory of voltage space vector analysis is proposed for SAPF(Shunt Active Power Filter).The optimal tracking of reference current is introduced,which ensures the amplitude of error current vector swiftly approaching to zero within a switching period.With full consideration of the actual voltage output capability,the output voltage vector of inverter is accurately calculated and composed by outputting multiple basic voltage vectors within a switching period,which ensures the differential of error current vector has the best direction and the largest amplitude.Therefore,the reference current is thus quickly followed while the inverter is controllable and the rapidness and reliability of control system are enhanced.Experimental results show the validity of the proposed control method.