Performance Analysis of Thirteen Level Asymmetrical Multi String Multi Level Inverter Fed Three Phase Induction Motor Drive
Journal Title: International Journal of Research in Computer and Communication Technology - Year 2014, Vol 3, Issue 11
Abstract
The concept of multilevel inverters, introduced about 20 years ago entails performing power conversion in multiple voltage steps to obtain improved power quality, lower switching losses, better electromagnetic compatibility, and higher voltage capability. The benefits are especially clear for medium-voltage drives in industrial applications and are being considered for future naval ship propulsion systems. Several topologies for multilevel inverters have been proposed over the years; the most popular cascaded H-bridge multi level inverter (CHBMLI) apart from other multilevel inverters is the capability of utilizing different dc voltages on the individual Hbridge cells which results in splitting the power conversion amongst higher-voltage lower-frequency and lower-voltage higher-frequency inverters. But the main disadvantages of Cascaded H-bridge multi level inverters are complexity, requiring a more number of power devices and passive components, and complex control circuitry. In this thesis, a Multi String Multi Level Inverter (MSMLI) topology is proposed, which offer strong advantages like an improved output waveforms, smaller filter size, and lower electromagnetic interference. Here an asymmetrical configuration of thirteen-level inverter (TLI) based Multi String Multi Level topology fed Three Phase Induction Motor Drive performance is analyzed and compared with conventional cascaded H- bridge multi level inverter. The performance factors are obtained at both transient, load variation and steady state operating conditions with usage of minimum number of switches so that switching losses total harmonic distortion (THD) can be reduced effectively with multi string multi level approach.
Authors and Affiliations
M. Veera Brahmam, K. V. Eswara Rao, B. Subba Reddy
Keywords
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