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The multilevel inverter (MLI) is used to convert DC supply into AC supply for medium and high-voltage power applications. It generates output voltage with less harmonic distortion, and the power quality is enhanced in comparison with the traditional inverters. Also, the output waveform obtained from the multilevel inverters approaches near to sinusoidal through several steps, which result in low harmonic content in the output with fewer filtering components. This research presents an innovative structure of a multilevel inverter (MLI) featuring a reduced count of DC voltage sources and controlled switches, aimed at harmonic reduction, which has been simulated. A single-phase 7-level symmetric and 13-level asymmetrical inverter with four unidirectional, six bidirectional switches and three unequal DC sources is proposed. LCL filter has been used to mitigate the total harmonic distortion (THD) in the output voltage. The results for THD are validated by using the FFT window. Inverter parameters are analyzed for 7-level symmetric and 13-level asymmetric MLI. The proposed system has been simulated using MATLAB/Simulink version 2024a.

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Modular Single-Phase 7L Symmetric and 13L Asymmetric Multilevel Inverter for Harmonic Mitigation

  • 会议论文

  • 发表日期：

    2026年

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  • D. Shyam,
  • I. Praveen,
  • P. Monisha,
  • R. Essakiraj,
  • A. Nazar Ali

摘要

The multilevel inverter (MLI) is used to convert DC supply into AC supply for medium and high-voltage power applications. It generates output voltage with less harmonic distortion, and the power quality is enhanced in comparison with the traditional inverters. Also, the output waveform obtained from the multilevel inverters approaches near to sinusoidal through several steps, which result in low harmonic content in the output with fewer filtering components. This research presents an innovative structure of a multilevel inverter (MLI) featuring a reduced count of DC voltage sources and controlled switches, aimed at harmonic reduction, which has been simulated. A single-phase 7-level symmetric and 13-level asymmetrical inverter with four unidirectional, six bidirectional switches and three unequal DC sources is proposed. LCL filter has been used to mitigate the total harmonic distortion (THD) in the output voltage. The results for THD are validated by using the FFT window. Inverter parameters are analyzed for 7-level symmetric and 13-level asymmetric MLI. The proposed system has been simulated using MATLAB/Simulink version 2024a.