High-Efficiency Transformerless Inverters for Photovoltaic Applications: A Review

Engineering notes

Engineering notes will be added by the Power for Solar editorial team.

Chinese explanation / 中文解读

中文解读待补充：本站会优先为光伏效率、钙钛矿太阳能电池、储能技术、太阳能热利用、BIPV、并网技术等高价值论文补充中文说明。

Original abstract

The increasing global demand for clean and sustainable energy has accelerated the deployment of photovoltaic (PV) power generation systems. Among the various renewable energy sources, solar photovoltaic technology has emerged as one of the most promising solutions due to its abundance, environmental friendliness, and declining installation costs. The inverter plays a critical role in photovoltaic systems by converting the direct current (DC) generated by solar panels into alternating current (AC) suitable for grid integration and consumer applications. Traditionally, transformers were incorporated within inverter structures to provide galvanic isolation and enhance safety. However, transformer-based inverters suffer from several disadvantages, including increased weight, larger volume, higher cost, and reduced efficiency due to transformer losses. To overcome these limitations, transformerless inverter technologies have been developed and widely adopted in modern photovoltaic systems. These inverters eliminate bulky transformers while achieving higher conversion efficiency, reduced installation cost, improved power density, and enhanced energy yield. Nevertheless, transformerless inverters introduce new challenges, particularly common-mode leakage current, electromagnetic interference, and compliance with international safety standards. This review paper presents a comprehensive study of high-efficiency transformerless inverter technologies for photovoltaic applications. The review aims to provide researchers and engineers with a consolidated understanding of transformerless inverter technologies and future directions for high- performance photovoltaic power conversion systems.

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