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<p>Multilevel converters are widely employed in utility-tied photovoltaic (PV) installations owing to their capability to produce superior-quality voltage waveforms with reduced harmonic content. However, conventional Pulse Width Modulation (PWM) strategies for multilevel inverters often face issues including increased harmonic distortion level, limited efficiency, and difficulty in achieving independent Maximum Power Point Tracking (MPPT) of solar energy modules under partial shading conditions. To overcome these issues, this paper introduces a novel Sorted Level-Shifted Third-Harmonic Injected Inverted Sinusoidal Carrier (SLSTHII-SC) PWM technique for a utility-connected 13-level PV inverter. The proposed method, integrated with a current controller and MPPT strategy, enables one-stage energy conversion while ensuring effective MPPT of individual solar module under different radiation level conditions. MATLAB Simulation and experimental hardware-in-the-loop (EHIL) results demonstrate that the proposed SLSTHII-SC PWM technique achieves significantly reduced THD in inverter voltage and grid current, along with higher inverter efficiency, compared to existing PWM approaches.</p>

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A Novel THI-PWM with Sorting Method for Grid-Connected CHB PV Inverter

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Gudipati Maheswari,
  • K. Manjunatha Sharma,
  • Prajof Prabhakaran

摘要

Multilevel converters are widely employed in utility-tied photovoltaic (PV) installations owing to their capability to produce superior-quality voltage waveforms with reduced harmonic content. However, conventional Pulse Width Modulation (PWM) strategies for multilevel inverters often face issues including increased harmonic distortion level, limited efficiency, and difficulty in achieving independent Maximum Power Point Tracking (MPPT) of solar energy modules under partial shading conditions. To overcome these issues, this paper introduces a novel Sorted Level-Shifted Third-Harmonic Injected Inverted Sinusoidal Carrier (SLSTHII-SC) PWM technique for a utility-connected 13-level PV inverter. The proposed method, integrated with a current controller and MPPT strategy, enables one-stage energy conversion while ensuring effective MPPT of individual solar module under different radiation level conditions. MATLAB Simulation and experimental hardware-in-the-loop (EHIL) results demonstrate that the proposed SLSTHII-SC PWM technique achieves significantly reduced THD in inverter voltage and grid current, along with higher inverter efficiency, compared to existing PWM approaches.