Energy Saving in UPS Testing with Grid Tied Inverter

Abstract

The aim of this project was to design, simulate, and analyze three-phase grid-tie in- verter systems used by UPS system for DC/AC power conversion. Analyzing and simulating the control structure of these inverters helps in learning how to increase effciency of the DC/AC conversion process to minimize power loss and saving in Electrical Energy. Specifically, the fundamental objective of the project was to de- velop a theoretical model of the three-phase grid-tie inverter systems and study how real and reactive power (P and Q) are varying based on the inverter output volt- age and frequency. The theoretical model for a single inverter system could then be applied to designing a controller for multiple inverter systems connected in paral- lel, using the droop control structure.The theoretical modeling was performed using MATLAB/Simulink. The single grid-tie inverter systems were monitored using these tools and the power outputs, both real and reactive,were measured with respect to changes in load. Based on the controller used in these simulations,it was found that real and reactive power stabilized over time after an initially high transient response. The Project involves implementation and designing the hardware of I6s model of UPS System. Future work for this project involves implementing the theoretical models developed in the scope of this project onto hardware provided by Saving in Electrical Energy and applying the theoretical models for single three-phase grid-tie inverter systems to multiple systems connected in parallel.