RT Journal Article
SR Electronic
T1 REDUCED SWITCH TOPOLOGIES FOR MULTI LEVEL INVERTERS WITH M-CARRIER SPWM
JF JCR
JO Journal of Critical Reviews
FD Innovare Academics Sciences
SP 623
OP 628
DO 10.31838/jcr.07.02.114
VO 7
IS 2
A1 Yaswanth Sai Kanigolla
A1 Ambati Ch
A1 ra Kiran
A1 S. Ravi Teja
A1 B. Jyothi
YR 2020
UL http://www.jcreview.com/?mno=89294
AB This paper presents the transformer based multilevel inverter topologies with a m-carrier based level shift sinusoidal pulse width modulation method. Two topologies are presented in which the first topology has two bridges, one gives quasi square wave output and the other gives pulse width waveform. The outputs of two bridges are energized with the two different ratio transformers. The secondary terminals of two transformers are cascaded to attain 19 level output voltage wave form. The second topology has only one bridge and it contains 8 switches and two DC sources. The bridge output is given to the transformer and it acts as an isolation. The output of the topology gives the 7-level output. This topology has less number of components to reduce the cost and provides inbuilt isolation, to enhance the reliability of converter. The paper uses the common level shift SPWM method with modified carrier that is m-carrier to attain the maximum amplitude and the harmonics are shifted to very high level without change in the frequency. The paper topologies are validated with experimental results.