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<p>This paper presents a novel modular multilevel inverter (MMI) design for grid-integrated renewable energy systems, with a focus on enhanced power quality and reduced component count. The proposed topology eliminates the need for an H-bridge circuit, utilizing only eight switches to generate 13-level output voltages in asymmetric mode, achieving a significant reduction in switch count compared to conventional designs. Key innovations include the use of a single photovoltaic (PV) panel coupled with a single-input multiple-output (SIMO) boost converter, which optimizes PV utilization and reduces system complexity. The inverter demonstrates superior performance metrics, including a high total utilization factor (TUF) and switch utilization factor (SUF), alongside a 57–33% reduction in switches relative to similar 13-level inverters. Selective harmonic elimination (SHE) is implemented using a particle swarm optimization (PSO) algorithm to solve nonlinear equations, effectively mitigating lower-order harmonics. The output voltage and current exhibit low total harmonic distortion (THD) of 3.31 and 2.8%, respectively, while experimental results confirm THD values of 5.17% (voltage) and 3.23% (current), compliant with IEEE 519 standards. An improved grid control method ensures seamless integration, and the system is controlled via an FPGA for precise switching operations. The inverter delivers an efficiency of 93.7%, minimizing conduction and switching losses through its streamlined design. Moreover, the estimated Mean Time to Failure (MTTF) is approximately 11.2&#xa0;years, indicating strong long-term reliability, making the inverter an appropriate solution for grid applications.</p>

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Melioration of power quality in a grid-integrated system using modular inverter fed with renewable energy sources

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • R. K. Rojin,
  • Dishore Shunmugham Vanaja

摘要

This paper presents a novel modular multilevel inverter (MMI) design for grid-integrated renewable energy systems, with a focus on enhanced power quality and reduced component count. The proposed topology eliminates the need for an H-bridge circuit, utilizing only eight switches to generate 13-level output voltages in asymmetric mode, achieving a significant reduction in switch count compared to conventional designs. Key innovations include the use of a single photovoltaic (PV) panel coupled with a single-input multiple-output (SIMO) boost converter, which optimizes PV utilization and reduces system complexity. The inverter demonstrates superior performance metrics, including a high total utilization factor (TUF) and switch utilization factor (SUF), alongside a 57–33% reduction in switches relative to similar 13-level inverters. Selective harmonic elimination (SHE) is implemented using a particle swarm optimization (PSO) algorithm to solve nonlinear equations, effectively mitigating lower-order harmonics. The output voltage and current exhibit low total harmonic distortion (THD) of 3.31 and 2.8%, respectively, while experimental results confirm THD values of 5.17% (voltage) and 3.23% (current), compliant with IEEE 519 standards. An improved grid control method ensures seamless integration, and the system is controlled via an FPGA for precise switching operations. The inverter delivers an efficiency of 93.7%, minimizing conduction and switching losses through its streamlined design. Moreover, the estimated Mean Time to Failure (MTTF) is approximately 11.2 years, indicating strong long-term reliability, making the inverter an appropriate solution for grid applications.