Research of Three phase Shunt Active Power Filter Based on Fuzzy-Sliding Variable Structure Control

In order to suppress harmonics and lower power factor due to the widely-used nonlinear load, and on the basis of mathematical model of shunt three-phase active power filter, a kind of shunt three-phase active power filter based on fuzzy-sliding mode variable structure control strategy is designed. This control strategy combines the sliding mode variable structure control and fuzzy control with reaching law. Application of this method is able to eliminate high frequency flicker caused by the sliding model variable structure control method, as well as make system have strong robustness against model uncertainties and external disturbance, furthermore, it is able to improve the character of reaching segment and to make the tracking errors converge to a neighborhood of zero. This control method is verified by simulation experiment, and the simulation results show that the control method is feasible and the system has good dynamic and static properties.