Advanced Leakage Current Suppression Techniques for Three-Phase Non-Isolated Photovoltaic Inverters: A Focus on Structural Modifications

Leakage current is a critical issue that affects non-isolated photovoltaic grid-connected inverter systems. The development and deployment of non-isolated PV inverters are severely hampered by leakage current, which can also raise system losses, compromise safety, impair the quality of the power grid, and generate electromagnetic compatibility problems. A three-phase non-isolated photovoltaic inverter is the focus of this paper's investigation, and the basic leakage current model is first built. Subsequently, the paper analyzes two of the latest leakage current suppression technologies from the perspective of circuit structure, comparing their advantages, disadvantages, and application scopes. Finally, the paper explores the future development directions and challenges of leakage current suppression technologies, providing valuable reference points for optimizing leakage current suppression in the future.