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Multilevel converters, a new breed of power converters have been under research and development for more than three decades and have found successful in various medium and high power industrial applications. However, this is still a technology under development, and many new contributions and new commercial topologies have been reported in the last few years. The general structure of the multilevel converter is to synthesize a sinusoidal voltage from several levels of dc voltage. This paper presents the design of neutral-point-clamped multilevel converter employing sinusoidal pulse width modulation control technique which is simulated using MATLAB/ Simulink. The main objective of this paper is to improve power quality of the supply by reducing THD. The operating principles, voltage balancing methods, and limitations of the converter are analyzed together with extensive simulation results.

Performance Evaluation of Multilevel AC/DC Converter for Power Quality Improvement with DC Bus Capacitor Voltage Balancing