A single phase parallely connected uninterruptible power supply/demand side management system

This paper presents the application of a single-phase parallel converter as an uninterruptible power supply and demand side management system, The pro posed system consists of a bi-directional inverter that is connected in par allel to the utility system. When the grid system fails, the converter will convert the power from the battery to the ac side (utility side) at the ma ins voltage and frequency. On the other hand, when the utility is normal th e converter will act as a demand side management system. It charges the bat tery during low load and shaves the transient load at the peak period syste m, This improves the pattern of the demand variation in the utility side. T his paper presents the operational principle of the Uninterruptible Power S upply and Demand Side Management System, laboratory, and simulation results .