SINGLE-STAGE VARIABLE TURNS RATIO HIGH-FREQUENCY LINK GRID CONNECTED INVERTER

Abstract

This paper presents a novel single-stage grid-connected inverter architecture that integrates a high-frequency link (HFL) transformer with a variable turn’s ratio to achieve efficient and flexible DC-to-AC power conversion. Unlike traditional multi-stage inverters that involve separate DC-DC and DC-AC conversion stages, the proposed topology combines galvanic isolation, voltage transformation, and grid interfacing in a unified stage, significantly reducing system complexity, size, and power loss. The high-frequency transformer operates in conjunction with a variable turn’s ratio mechanism—either through electronically controlled switches or multi-tap configurations—to adaptively match input source variations and grid requirements. This enables enhanced voltage regulation, improved power conversion efficiency, and better dynamic performance under fluctuating load and generation conditions. The system is particularly suited for renewable energy applications such as photovoltaic (PV) and battery energy storage systems, offering scalable and cost-effective solutions for modern grid integration. Control strategies for synchronization, power quality, and protection are also addressed to ensure compliance with grid standards.

Author

Mr. Dinesh Kumar M, Mr.FaizanShariff Z, Mr.Meiyarasu V, Mr.NarendraPrasath S, Mr.Prathap R