Experimental verification of single-phase inverter with power decoupling function using boost-up chopper

This paper discusses a circuit configuration for a single-phase voltage source inverter that features power decoupling function. Generally, the converter that is connected to a single-phase power grid is required to decouple the power ripple with a twice frequency of the power grid. The proposed circuit compensates the single-phase power ripple by using an active buffer with small capacitors 50μF at 200 W. In this paper, the fundamental operations of the proposed converter are confirmed by experimental results. Then, the proposed converter is evaluated with the maximum power point tracking (MPPT) under a simulated photovoltaic (PV) conditions. From the experimental results, the output current Total Harmonic Distortion (THD) is 3.51% and the output power factor is over 99%. In addition, the input current ripple is reduced 12.3%. Moreover, from the loss analysis, the maximum efficiency of the inverter including the active buffer circuit is 95.5%.

I. Introduction

The dramatically cost down of photovoltaic (PV) has urged the uses of solar energy becoming popular in the interest of energy saving. In general, the power conversion system employs a grid connected inverter with the boost-up chopper to connect the PV modules to a single-phase grid system.