重复控制在并联有源滤波器中的应用

Application of Repetitive Control Technique in Shunt Active Power Filter

有源滤波器(active power filter,APF)是消除电网中非线性负载产生的电流谐波的有效手段。针对某一类非线性负载,该文提出了一种在单一同步坐标系下的复合控制器,包含PI和重复控制器。该复合控制器结合了PI和重复控制器的优点,能够消除稳态误差和改善系统鲁棒性。详细研究了复合控制器的设计方法,对控制系统稳定性进行了分析。所提控制方法在三相并联有源滤波器系统进行了验证,实验结果证明了所提出的混合控制器具有优异的性能。

Shunt active power filters （APF） have been proved as effective means to compensate distorted currents caused by nonlinear loads in power distribution systems. This paper presents an all-digital hybrid controller, called single synchronous frame hybrid （SSFH） controller concerning to special nonlinear load. The hybrid controller operates in an SSF mixing conventional PI with repetitive controller. This approach can get zero state error and improve robustness. A detailed design criterion for the SSFH controller is presented based on a frequency-response approach. The design is performed for the particular application of three-phase shunt active filter and several experimental results are also presented to show the good behavior of the closed-loop system.