Authors : Madhuri Kshirsagar

Volume/Issue : Volume 10 - 2025, Issue 8 - August

Google Scholar : https://tinyurl.com/7cerwbrs

Scribd : https://tinyurl.com/msp3xzv3

DOI : https://doi.org/10.38124/ijisrt/25aug1561

Note : A published paper may take 4-5 working days from the publication date to appear in PlumX Metrics, Semantic Scholar, and ResearchGate.

Note : Google Scholar may take 30 to 40 days to display the article.

Abstract : Photovoltaic (PV) grid-tied inverters are essential for integrating solar energy into modern power grids. Transformerless topologies have become increasingly significant due to their superior efficiency, reduced cost, and compact size compared to traditional transformer-based inverters. Among these, the H6 topology has gained prominence for its ability to suppress common-mode (CM) leakage currents and maintain high efficiency. This paper reviews the principles, advantages, limitations, and applications of the H6 topology, with a comparative analysis against other transformerless inverter designs such as H5, HERIC, and NPC. Particular emphasis is placed on leakage current suppression, control strategies, and future research directions involving wide-bandgap devices and AI-based optimization. Reported efficiencies exceed 97%, making H6 inverters suitable for residential and commercial PV applications. This review highlights ongoing challenges in EMI, thermal management, and grid compliance, and provides insights into future developments in PV inverter technology.

Keywords : PV Inverter, H6 Topology, Transformerless, Grid-Tied, Leakage Current, Efficiency.

References :

1. Blaabjerg, F., Yang, Y., Ma, K., & Wang, H. (2013). 'Power electronics for renewable energy systems – status and trends.' IEEE Journal of Emerging and Selected Topics in Power Electronics.
2. Kjaer, S. B., Pedersen, J. K., & Blaabjerg, F. (2005). 'A review of single-phase grid-connected inverters for photovoltaic modules.' IEEE Transactions on Industry Applications.
3. Sangwongwanich, A., Yang, Y., & Blaabjerg, F. (2017). 'Transformerless PV inverter topologies with active and reactive power injection for grid compliance.' IEEE Transactions on Power Electronics.
4. Additional references from 2020–2024 should be included from IEEE Xplore, Elsevier, and MDPI to strengthen the review.