IMPLEMENTATION OF NEW H- BRIDGE MULTILEVEL INVERTER USING A COMBINATION OF HIGH FREQUENCY AND LOW FREQUENCY MODULATION
This paper proposes a seven level inverter with photovoltaic system, for stand-alone applications with hybrid PWM control scheme. Three carrier signals that are identical to each other which are compared with unidirectional sinusoidal reference signal were used to generate the PWM signals. In this paper, a new topology with a combination of low frequency and high frequency switches is proposed to improve the performance of a multilevel inverter. This topology requires fewer components compared to existing inverters and requires fewer carrier signals and gate drives. Therefore, the overall cost and complexity are greatly reduced. The performance of proposed multilevel inverter with equal dc sources is simulated by using MATLAB platform. Harmonic analysis is done on H-Bridge seven level inverter and experimental results are presented to demonstrate the superiority of the proposed system.
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A.Maheswari was born in
Tamilnadu, India, on April
7, 19 She received her
B.E degree in Electrical and
from V.M.K.V Engineering
College, Salem, in 2004, the
M.E degree in Power Elec
tronics and Drives from Government College of
Engineering, Salem, in 2008. Currently she is pur
suing Ph.D. She has presented 7 papers in various
national and international conferences. She has
also published six papers in the international jour
nal. Her current research interests include simula
tion and control techniques of AC drives, inverter
topologies and harmonic suppression.
Dr. I. Gnanambal was born
in Tamilnadu, India. She re
ceived her B.E degree in
Electrical and Electronics
Engineering from Govern
ment College of Engineering,
Salem, in 1981, the M.E de
gree in Applied Electronics
in Government College of Technology, Coim
batore, in 2002 and Ph.D. degree in Networking
from Anna University, Chennai in 2008. She has
presented more than 60 papers in various national
and international conferences. She has also pub
lished more than fifteen papers in international
journals. Her research interests include power
electronics, solid state drives, networking and
special electrical machines.