Abstract

Microgrid is a well-known concept for integrating the distributed resources into the current power distribution network. Micro-grid systems are comprised of several alternative energy sources. A micro grid consists of small power sources called Distributed Generation (DG) systems, some of them are derived from renewable power sources such as micro wind turbines, and Photovoltaic (PV) panels. A micro grid has operates as a single controllable system providing power and heat to a localized area. It can operate both independently or connected to the main distribution grid. Most of the modern DG systems such Photovoltaic (PV) systems are grid interfaced through power electronics Voltage Source Inverters (VSI), however, small scale DG systems have other interface means, mainly asynchronous (induction) and synchronous generators, which are directly connected to the main grid. Technical issues associated with operation of micro grid are interconnection and the islanding mode. Interconnection of micro grid with main grid is complex; complexity in interconnection is affected by the types of power generation number of generating sources, location of points of interconnection and level of penetration of micro grid system with main grid. The major challenge in micro grid is the protection system. Protection system must respond to both main grid and micro grid faults. Protection system should isolate the micro grid from the main grid as fast as possible to protect the micro grid. This project presents a flexible ac distribution system device for microgrid applications. The device aims to improve the power quality and reliability of the overall power distribution system that the microgrid is connected to. The proposed concept is verified by using Matlab/Simulink software and the corresponding results are presented.

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