A Control Strategy of Step-down Chopper for Smoothing DC Current in Single-phase PWM Current Source Inverter-Photovoltaic Generation System

Abstract

This paper presents a control strategy of the step-down chopper in a single-phase utility interactive photovoltaic generation system with a PWM current source inverter. The chopper regulates the dc current under fixed PWM operation of the inverter and the switching of the chopper contributes achieving the smooth dc current. The experimental results prove that the dc current pulsation is suppressed enough and the proposed method is applicable to power control of the PV arrays.