Suppression & Comparison of magnetizing Current of a transformer with PWM voltage source converter

1. Suppression & Comparison of magnetizing Current
of a transformer with PWM voltage source
converter
Sridevi Tirunagari, Ramesh Reddy Kolli
G.Narayanamma Institute of Technology & Science, Hyderabad, India
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http://www.icgst.com/paper.aspx?pid=P1111431335

2. This paper discusses about inrush current phenomenon in a single phase and 3-
Phase transformer initially in the absence of any inrush current suppressing device
and then with Pulse Width Modulated voltage source converter and is compared
with other technique having dc voltage regulation using PI controller. In both the
proposed techniques main transformer is connected in series to a PWM voltage
source converter through a matching transformer to the source. As the PWM
converter is connected in series to the source it acts as a resistor for the source
current there by producing no inrush phenomenon. Inrush current suppression
principles for both methods were discussed with the help of block diagrams.
Variation of magnetizing current with varying control gains is discussed in both the
cases and the results were shown to confirm the validity. Both the methods were
developed & simulated in MATLAB/SIMULINK environment.
2www.icgst.com
http://www.icgst.com/paper.aspx?pid=P1111431335
Suppression & Comparison of magnetizing Current of a transformer with
PWM voltage source converter
Abstract

3. 3www.icgst.com
K.Ramesh Reddy has received M.Tech from REC Warangal, India in 1989 and Ph.D in
Electrical Engineering from Sri Venkateswara University, India in 2004. His main
research includes Power system modeling and control, Power quality. He is currently
Dean and Head of EEE at G.Narayanamma Institute of Technology and Science,
Hyderabad, India
G.Narayanamma Institute of Technology and
Science
http://www.gnits.ac.in/

4. 4www.icgst.com
Sridevi Tirunagari born in India in 1978. she received B.Tech in EEE from Nagarjuna University in 1999,
M.Tech in Power systems from Jawaharlal Nehru Technological University, Anantapur, India in 2005 and
presently pursuing Ph.D from J.N.T.U Hyderabad. Currently she is working for G.Narayanamma institute of
Technology & Science and she is a PhD student of J.N.T.U Hyderabad Under the supervision of Dr Kolli
Ramesh Reddy. Four International and two national conference papers are at her credit. She is a member of
ISTE and IEEE. Her research and study interests include Power quality, Modeling of power system
components and Harmonics in power systems.
GNITS,Hyderabad, JNTU hyderabad
http://www.gnits.ac.in/

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