组合趋近律滑模控制算法在APF中的应用研究

Application Research on Sliding Mode Control Algorithm Mixing Reaching Law to APF

有源电力滤波器(APF)被公认为是治理电网谐波最有效的手段,但存在固有的抖振问题。针对实际APF系统对控制性能的要求,提出基于组合趋近律的离散滑模控制算法,在滑模运动前期采用指数趋近律,在滑模运动后期采用变速趋近律,以削弱系统的抖振,提高系统稳态性能,实现更好的信号跟踪效果。

Although the active power filter （APF） is considered to be the most effective measure to cure the harmonic wave in the power grid now, but its control method inheres the problems of buffeting. Aiming at the practical requirements of APF on the performance of control, the algorithm with mixing reaching law is proposed based on the discrete sliding mode control. In the early stage of the sliding mode motion, the exponential reaching law is adopted, and in the later stage the variable rate reaching law is used. Thus, the buffeting of system would be weakened, the dynamic performance and tracking effect of system are improved.