Scholarlink

<p>Reduced switch-count multilevel inverters are increasingly explored for photovoltaic (PV) applications due to their compact design, improved efficiency, and simplified control. However, maintaining a stable PV output voltage typically requires additional DC–DC converters, which can lower system efficiency. This work presents a unified control framework that integrates DC-link voltage regulation with the operation of a grid-connected T-type five-level inverter, eliminating the need for separate intermediate converters. A level-shifted pulse width modulation strategy is employed to generate five-level output waveforms, while a proportional-resonant controller ensures stable grid integration. The proposed system is evaluated through MATLAB/Simulink under varying load and different modulation conditions and further validated using a 200 W experimental prototype. The results confirm that the proposed approach achieves high-quality output with improved energy conversion and an efficiency of 97.8%, demonstrating its suitability for compact and efficient grid-tied PV systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

DSP controlled single-phase two-stage five-level inverter for high-efficiency grid-connected photovoltaic systems

  • 期刊论文

  • 发表日期：

    2025年11月24日

查看全文
  • Ravali Palakurthi,
  • Kirubakaran Annamalai

摘要

Reduced switch-count multilevel inverters are increasingly explored for photovoltaic (PV) applications due to their compact design, improved efficiency, and simplified control. However, maintaining a stable PV output voltage typically requires additional DC–DC converters, which can lower system efficiency. This work presents a unified control framework that integrates DC-link voltage regulation with the operation of a grid-connected T-type five-level inverter, eliminating the need for separate intermediate converters. A level-shifted pulse width modulation strategy is employed to generate five-level output waveforms, while a proportional-resonant controller ensures stable grid integration. The proposed system is evaluated through MATLAB/Simulink under varying load and different modulation conditions and further validated using a 200 W experimental prototype. The results confirm that the proposed approach achieves high-quality output with improved energy conversion and an efficiency of 97.8%, demonstrating its suitability for compact and efficient grid-tied PV systems.