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An Improved Space Vector Pulse Width Modulation for Nine-Level Asymmetric Cascaded H-Bridge Three-Phase Inverter

  • Busireddy Hemanth Kumar
  • Makarand Mohankumar Lokhande
  • Karasani Raghavendra Reddy
  • Vijay Bhanuji Borghate
Research Article - Electrical Engineering
  • 5 Downloads

Abstract

This paper presents an improved space vector pulse width modulation (SVPWM) for nine-level cascaded H-bridge inverter with unequal DC voltage sources. This technique is based on the use of \(60^{\circ }\) spaced rs coordinate system to achieve SVPWM of multilevel three-phase inverter. In order to realize nine-level inverter, conventional SVPWM requires 1296 lookup tables, which is difficult to realize in the form of lookup tables, but the proposed technique does not require any lookup tables in the process of SVPWM realization, and it is generalized algorithm for any inverter levels. Hence, the system memory requirement is very less. The proposed modulation technique improves the nature of inverter output voltage and its total harmonic distortion value. Simulation results have been carried out using MATLAB/SIMULINK software tool. A comparative analysis is performed with classical pulse width modulation (PWM) techniques like sinusoidal PWM and third harmonic injection PWM at different modulation indices. To validate the simulation results and to confirm the practicality of the proposed control algorithm, experimental verification has been done.

Keywords

Cascaded H-bridge (CHB) Space vector pulse width modulation (SVPWM) Asymmetric Harmonic distortion Nine-level inverter 

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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  1. 1.Electrical Engineering DepartmentVisvesvaraya National Institute of TechnologyNagpurIndia
  2. 2.Electrical Engineering DepartmentSreenidhi Institute of Science and TechnologyHyderabadIndia

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