采用并联通用内模的三相APF重复控制策略

Repetitive control strategy using shunt generic internal model for three-phase active power filter

为了在高精度电流跟踪的前提下,提高三相并联型有源电力滤波器电流跟踪控制的适应性和动态性能,提出了一种基于并联通用内模的复合重复控制策略。并联通用内模能依据指令电流谐波成份的变化调节内模参数,改变内模的补偿范围,而且能将延迟时间缩短至同等补偿范围内模的一半,显著提高了重复控制器应对负载或谐波源变动的能力和动态性能。设计了基于并联通用内模的重复控制器,并采用插入式结构将其与比例控制组成了复合重复控制系统。详细分析了复合控制系统的稳定性、稳态误差和收敛性。将提出的复合重复控制策略应用到三相四线制电网并联APF系统中,并与其他控制策略进行了比较。仿真和实验结果证明了基于并联通用内模的复合重复控制策略的有效性和优越性。

To improve the adaptability and dynamic performance of current control for three-phase shuntAPF under tlie accurate current tracking,a repetitive control strategy based on shunt generic iel was proposed. The shunt generic internal model can adjust compensation range according to changes inharmonics of current reference and can shorten half of delay time of internal models which have the samecompensation range. It significantly improves the dynamic performance and abilities wferent harmonic sources and changing load of repetitive controller. A novel compositerepetitive controller based on proposed internal model and proportional controller in plug-in mode was pro-posed. Its stability, steady-state error and convergence were analyzed in detail. The comparison of pro-posed control strategy with others was made in shunt APF of three-phase four-wire sexperimental results are shown to confirm the validity and superiority of the proposed repetitive controlstrategy.