Single phase amplitude modulation inverter for utility interaction photovoltaic system

Abstract

In this paper, a new inverter for a utility interactive photovoltaic system is proposed. This system consists of the DC converter that generates the single phase absolute value of sinusoidal current and a square wave voltage inverter which synchronizes with the AC power source. This DC converter consists of two switching devices and a capacitor for a nondissipative snubber circuit. The DC converter is applied to a pulse width modulation to obtain absolute value of sinusoidal current. It is not necessary to set the dead time of the switching devices in generating waveforms. Therefore, we can regard the dead time effects as small. The inverter is switched by the AC power source frequency so the line noise of voltage and current caused by the high frequency switching is very small. In this paper, it is confirmed by simulation that the proposed inverter for a new photovoltaic system has stable operation and good output characteristics are obtained by the experimental results.