Performance Analysis of Twenty Seven Level Asymmetrical Cascaded H-Bridge Multi Level Inverter Fed Three Phase Induction Motor Drive
P. Roseline1, B. Ramesh2, Ch. V. V. Manga Lakshmi3
1Ms. P. Roseline, M. Tech Student in Power Electronics and Electrical Drives, Pragati Engineering College, Surampalem, (Andhra Pradesh), India.
2Mr. B. Ramesh, M. Tech, Asst. Prof, Department of E.E.E, Pragati Engineering College, Surampalem, (Andhra Pradesh), India.
3Ms. Ch. V. V. Manga Lakshmi, M. Tech, Asst. Prof, Department of E.E.E, Pragati Engineering College, Surampalem, (Andhra Pradesh), India.
Manuscript received on September 24, 2014. | Revised Manuscript received on October 11, 2014. | Manuscript published on October 30, 2014. | PP: 23-28 | Volume-4 Issue-1, October 2014. | Retrieval Number: A3444104114/2013©BEIESP
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Abstract: Multilevel inverters are suitable of high power handling capacity, associated with lower output harmonics and lower commutation losses. But the main disadvantages of multi level inverters are complexity, requiring a more number of power devices and passive components, and complex control circuitry. Hence a Twenty Seven Level Cascaded H-Bridge multi level inverter (CHBMLI) topology is proposed which requires only twelve switches and those switches are controlled by using of New PWM technique i.e., POD (Phase Opposition Disposition) modulation method whereas Twenty switches are required in the cascaded H- bridge multi level inverter (CHBMLI) for Eleven Level by using of Repeating sequence method. The proposed cascaded H- bridge multi level inverter topology offers strong advantages such as improved output waveforms, smaller filter size, and lower electromagnetic interference. Here an asymmetrical configuration of Twenty Seven-level inverter (TSLI) based Cascaded H-Bridge Multi Level topology fed Three Phase Induction Motor Drive performance is analyzed and compared with CHBMLI with Repeating sequence as switching technique. The performance factors are obtained at both transient and steady state operating conditions with usage of minimum number of switches so that switching losses can be reduced effectively with cascaded H- bridge multi level approach.
Keywords: Cascaded H-Bridge Multi Level Inverter, Phase opposition disposition, Twenty seven level inverter, Total harmonic distortion.