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A nine-level hybrid symmetric cascaded multilevel converter for induction motor drive

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Abstract

A nine-level hybrid symmetric cascaded multilevel converter (MLC) fed induction motor drive is proposed in this paper. The proposed converter is capable of producing nine output voltage levels by using the same number of power cells as that of conventional five-level symmetric cascaded H-bridge converter. Each phase in this configuration consists of one five-level transistor-clamped H-Bridge (TCHB) power cell and one three-level H-bridge power cell with equal dc link voltages, and they are connected in cascade. Due to cascade connection and equal dc link voltage, the power shared by each power cell is nearly equal. Near-equal power sharing enables the feature of improving input current quality by using an appropriate phase-shifting multi-winding transformer at the converter input. In this paper, the operation of the converter is explained using staircase and hybrid multi-carrier sine PWM techniques. Further, a detailed analysis for the variations in the dc link capacitor voltages and the dc link mid-point voltage in TCHB power cell is carried out, and the analytical expressions thus obtained are presented. The performance of proposed system is analysed by simulating a 500 hp induction motor drive system in MATLAB/Simulink environment. A laboratory prototype is also developed to validate the claims experimentally.

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Authors and Affiliations

  1. Department of Electrical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India

    Indrajit Sarkar & B G Fernandes

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  1. Indrajit Sarkar
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  2. B G Fernandes
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Correspondence to Indrajit Sarkar.

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Sarkar, I., Fernandes, B.G. A nine-level hybrid symmetric cascaded multilevel converter for induction motor drive. Sādhanā 42, 1389–1400 (2017). https://doi.org/10.1007/s12046-017-0665-1

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  • DOI: https://doi.org/10.1007/s12046-017-0665-1

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