PV AC Modules by PR+ Fuzzy for Control Strategy of Fly back Micro inverter with Hybrid Mode

Abstract

This paper presents a control strategy of a flyback microinverter with hybrid operation mode for photovoltaic (PV) AC modules.This paper presents a control strategy of a fly back micro inverter with hybrid operation mode for photovoltaic (PV) AC modules. The proposed control strategy consists of two components: the proportional-resonant (PR) + Fuzzy controller with the harmonic compensator (HC), and the hybrid nominal duty ratio. Compared to the conventional control strategy using the proportional-Resonant (PR) controller, the PR+ Fuzzy controller with HC provides higher system gain at the fundamental and harmonic frequencies of the grid without using high proportional gain in both operation modes. Then, it enhances tracking speed and disturbance rejection performances satisfying the desired stability. Moreover, by applying the hybrid nominal duty ratio yielded from the proposed operation mode selection, the disturbance rejection is achieved more effectively, and the control burden is reduced. Finally, the simulation and experiment results were shown to verify the tracking speed and disturbance rejection performances of the proposed control strategy.