PROJECT TITLE :

A Single-Phase Grid-Connected Photovoltaic Inverter Based on a Three-Switch Three-Port Fly back with Series Power Decoupling Circuit - 2017

ABSTRACT:

During this paper, a unique single-stage three-port inverter that connects photovoltaic (PV) panel to a single-part power grid is introduced. In a single-phase grid-connected PV panel, the input power is constant during the line-frequency amount, whereas the output power oscillates at double-line frequency. A series active power decoupling circuit utilizing thin-film capacitors is incorporated to a conventional flyback inverter to handle input and output power variations. Therefore, popularly low-reliable electrolytic capacitors are replaced with tiny long-lifetime skinny film. The proposed inverter can extract the utmost power from PV, deliver a coffee total harmonic distortion sinusoidal current to the output, and decouple the input and output powers. The proposed power decoupling circuit shares the inverter main switch. Therefore, these functions are achieved using simply 3 switches and a straightforward control scheme that is applicable for both charging and discharging states. Operation principle and management strategy are mentioned very well. Experimental results based on a 100-W prototype inverter verify feasibility and functionality of the proposed inverter.