Non-isolated Single Phase Uninterruptible Power Supply (UPS) System Muhammad Aamir Advisor: Prof. Dr. Hee-Jun Kim Department of Electronics, Electrical, Control School of Engineering Hanyang University South Korea

MASTERS THESIS
Non-isolated Single Phase Uninterruptible Power
Supply (UPS) System

Advisor: Prof. Hee Jun Kim
This paper is presented as Master of Science Degree Thesis
August, 2011
Graduate School of Engineering,
Department of Electronics, Electrical, Control, and
Instrumentation Engineering
Hanyang University

Abstract
Non-isolated Single Phase Uninterruptible Power Supply (UPS)
System
Muhammad Aamir
Advisor: Prof. Dr. Hee-Jun Kim
Department of Electronics, Electrical, Control,
& Instrumentation Engineering
Graduate School of Engineering
Hanyang University
South Korea
In this thesis, a high performance single phase transformer-less online
uninterruptible power supply (UPS) is proposed. The use of the bidirectional
buck-boost converter with high conversion ratio not only reduces the number
of batteries but also ensures a transformer-less system. The rectifier has
capability of power factor correction and provides regulated DC link voltage
whereas the inverter provides a regulated sinusoidal output voltage to the
load. In order to control the transient effect, efficient control scheme is
adopted in the system. The overall efficiency of the system is improved with
significant reduction in size and weight of the system due to decrease
number of batteries. Qualitative analysis and experimental results obtained
with a 500VA prototype shows a normal efficiency of over 94% and an input
power factor of over 99%.
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