A Novel Single-Phase Sinusoidal PWM Voltage Source Inverter and its Applicarion for Residential Photovoltaic Power Generation System

Abstract

In this paper, a novel single-phase sinusoidal PWM voltage source inverter (VSI) is proposed. The inverter has an additional arm to the normal single-phase bridge circuit. The two auxiliary self-turn-off devices of the branch avail to adopt the composite PWM control, which contributes to reduce the ripple in the ac output current. Also, the inverter has a LC series resonance circuit tuned to twice the system frequency f, which is connected in parallel with the smoothing capacitor on the dc side. This absorbs the ac component included the dc pulsating current with 2f. Consequently, the capacity of the smoothing capacitor is drastically reduced. As an example of the application of this VSI, the utility connected residential photovoltaic power generation system is shown. In the system, the smooth dc current without pulsation is supplied from PV array, and the VSI provides a sinusoidal ac current for domestic lords and the utility line.