Constant Switching Frequency Hysteresis Band Robust Controller for LCL Interfaced Grid Connected PV system

摘要

The hysteresis band current controller is one of the commonly used controllers with robust tracking property. The main disadvantage of the conventional hysteresis current controller (HCC) is variable switching frequency corresponding to fixed hysteresis band. The design constraints of LCL filter cannot be adopted properly due to the variable switching frequency of HCC. This paper proposes the constant switching frequency (adaptive band) HCC for LCL interfaced grid connected PV system maintaining robustness of the controller.