Fuzzy Control and Lyapunov-Based Stable Control of the Single-Phase Shunt Active Power Filter

As the exact mathematical model of the active power filter (APF) is quite difficult to determine, especially when the load and the parameters are changing. Applying the ordinary proportional-integral (PI) controller with constant parameters cannot achieve ideal results. This paper introduces the adaptive fuzzy PI controller to the voltage control of the APF, which can achieve better tracing result for adjusting the parameters of the PI controller according to the error and error changing rate of the DC side voltage. Applying the current control method based on Lyapunov stable theory, APF can work stable under the circumstance of changing of load and parameters. Through testing with the Matlab/Simulink, the effectiveness of the proposed method is confirmed.