Design and Analysis of the Performance of a Solar Driven Micro-Inverter Using Single Ended Primary Inductance Converter Topology

Abstract

In typical solar power installations, multiple modules are connected to the grid through a single high-power inverter. However, an alternative approach is to connect each solar module directly to the grid through a micro-inverter. This approach makes the system robust to single module failures and results in better power tracking. PV based cower conditioning system need a high-efficiency dc–dc converter capable of regulation over a wide input voltage range for Maximum Power Point Tracking (MPPT) and a high-efficiency micro-inverter. To diminish the ground leakage currents, also to use a high-efficiency system, the proposed concept is required for this micro-inverter to provide galvanic isolation between the PV module and the inverter. This concept involves the design of a micro-inverter topology which includes design of Single Ended Primary Inductance Converter (SEPIC) dc/dc converter, isolated resonant inverter and a cyclo-converter. The SEPIC converter topology yields high efficiency through constant voltage MPPT algorithm. The Resonant inverter topology produces efficient output through low circulating currents, Zero Voltage Switching (ZVS), low-current switching of the primary side devices, and Zero Current Switching (ZCS) of the output diodes. This Resonant inverter topology is also able to provide voltage regulation through basic fixed-frequency Pulse Width Modulated (PWM) control. The features of proposed system can able to achieve w the simple addition of a secondary-side bidirectional ac switch to the isolated series resonant converter.