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<p>Development of renewable energy sources was motivated by the need for uninterruptible power generation with reduced carbon emissions. Solar photovoltaic (PV) connected power systems are typically designed to meet the growing demand for power in grid-connected systems. The direct current (DC) power generated from a PV panel is converted into alternate current power for a grid-connected system. Using multilevel inverters (MLIs) during power conversion increases the complexity. The increased number of switches and DC sources in the MLI is one of the main problems. Therefore, this paper proposes a novel 9-level and 17-level MLI with fewer switches. Additionally, switching pulses for the proposed inverter controller are tuned with the help of the proposed mother optimized cascaded fractional order tilt integral and proportional–integral–derivative controller. The gain parameters in this controller are tuned using the mother optimization algorithm with less error. The performance of proposed methodology is verified by implementing it in the MATLAB/SIMULINK tool. Results show that proposed 9-level inverter has 1.72% and the 17-level has 3.98% of total harmonic distortion, lower than existing controllers. Also, the proposed method is validated by implementing it in an experimental setup, indicating good agreement with the simulated results.</p>

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Harmonic reduction in multilevel inverter using a novel mother optimized cascaded controller in grid-connected system

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • C. R. Rajesh,
  • J. Evangelin Jeba

摘要

Development of renewable energy sources was motivated by the need for uninterruptible power generation with reduced carbon emissions. Solar photovoltaic (PV) connected power systems are typically designed to meet the growing demand for power in grid-connected systems. The direct current (DC) power generated from a PV panel is converted into alternate current power for a grid-connected system. Using multilevel inverters (MLIs) during power conversion increases the complexity. The increased number of switches and DC sources in the MLI is one of the main problems. Therefore, this paper proposes a novel 9-level and 17-level MLI with fewer switches. Additionally, switching pulses for the proposed inverter controller are tuned with the help of the proposed mother optimized cascaded fractional order tilt integral and proportional–integral–derivative controller. The gain parameters in this controller are tuned using the mother optimization algorithm with less error. The performance of proposed methodology is verified by implementing it in the MATLAB/SIMULINK tool. Results show that proposed 9-level inverter has 1.72% and the 17-level has 3.98% of total harmonic distortion, lower than existing controllers. Also, the proposed method is validated by implementing it in an experimental setup, indicating good agreement with the simulated results.