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<p>This paper presents a novel three-phase, three-level Modified Quasi-Z-Source Controlled Diode Bridge Clamped Inverter (MQZS-CDBC-3LI) topology designed for photovoltaic (PV) applications. The proposed system addresses critical challenges associated with traditional inverters. The proposed topology utilizes a reduced number of actively controlled switches compared to conventional multilevel inverter configurations. The inverter utilizes an optimized Maximum Constant Boost Control (MCBC) strategy integrated with Space Vector Pulse Width Modulation (SVPWM) to achieve superior voltage quality, neutral point balancing, 7.15% reduction in switching transitions and peak efficiency 95% compared to existing techniques. A novel shoot-through (ST) technique is implemented to obtain voltage boosting. The ST insertion process to achieve balanced inductor voltage is discussed in detail. The system's control strategy ensures maximum power point tracking (MPPT) through a Perturb and Observe (P&amp;O) algorithm. Experimental validation on prototype, supported by MATLAB/Simulink simulations, demonstrates neutral point balancing with reduced switching transitions. The proposed MQZS-CDBC-3LI proves to be a reliable and cost-effective solution for utility-scale PV applications.</p>

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Topology and Space Vector Modulation Technique for Reduced Switch Count Modified Quasi-Z Source PV-Tied 3L-Inverter

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • Saima Ashraf,
  • Santosh Sonar,
  • Sandeep Pandey

摘要

This paper presents a novel three-phase, three-level Modified Quasi-Z-Source Controlled Diode Bridge Clamped Inverter (MQZS-CDBC-3LI) topology designed for photovoltaic (PV) applications. The proposed system addresses critical challenges associated with traditional inverters. The proposed topology utilizes a reduced number of actively controlled switches compared to conventional multilevel inverter configurations. The inverter utilizes an optimized Maximum Constant Boost Control (MCBC) strategy integrated with Space Vector Pulse Width Modulation (SVPWM) to achieve superior voltage quality, neutral point balancing, 7.15% reduction in switching transitions and peak efficiency 95% compared to existing techniques. A novel shoot-through (ST) technique is implemented to obtain voltage boosting. The ST insertion process to achieve balanced inductor voltage is discussed in detail. The system's control strategy ensures maximum power point tracking (MPPT) through a Perturb and Observe (P&O) algorithm. Experimental validation on prototype, supported by MATLAB/Simulink simulations, demonstrates neutral point balancing with reduced switching transitions. The proposed MQZS-CDBC-3LI proves to be a reliable and cost-effective solution for utility-scale PV applications.