Durham School of Architectural Engineering and Construction


First Advisor

Dale Tiller

Date of this Version


Document Type



A THESIS Presented to the Faculty of The Graduate College at the University of Nebraska In Partial Fulfillment of Requirements For the Degree of Master of Science, Major: Architectural Engineering, Under the Supervision of Professor Dale Tiller. Lincoln, Nebraska: May 2017

Copyright (c) 2017 Fares Al Juheshi


There is a high integration of renewable energy sources in modern building electrical systems. The main components of these new systems are power electronics switches that inherit their foundations from signal amplifier technologies and then developed to drive high powers. Nowadays, the static converter can connect systems with different electrical characteristics. For instance, choppers connect two DC systems with different voltage levels, whereas inverters transform power from DC to AC with variable amplitude and frequency. Since multilevel inverters offer a better quality of the output waveforms than standard inverters, a novel three-phase, five-level inverter topology is proposed. The goal of this work is to conserve energy and enhance the electrical system quality when it is converted from DC to AC voltage by increasing the efficiency of inverter voltage output with a new proposed topology and proposed modulation technique. The main advantages of this novel topology are overall reduction in the number of power electronics components when compared with traditional designs; reduction in the total price of the inverter components; reduction in the total volume and weight; reduction in the total pre-calculated switching angles using the proposed modulation technique, and eliminating the maximum harmonics in the output waveform, while at the same time, minimizes the total harmonics distortion THD in the output.

Advisor: Dale Tiller