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Abstract
The microgrid is a collection of distributed generators orMicro resources, energy storage devices, and loads which operate as a single and independent controllable system capable of providing both power and heat to the area of service . The micro resources that are incorporated in a microgrid are comprised of small units, less than 100 kW, provided with power electronics (PE) interface. Most common resources are Solar Photovoltaic (PV), Fuel Cell (FC), or microturbines connected at the distribution voltage level. In a microgrid, the micro sources and storage devices are connected to the feeders through the microsource controllers (MCs) and the coordination among the micro sources is carried out by the central controller (CC).The microgrid is connected to the medium voltage level utility grid at the point of common coupling (PCC) through the circuit breakers. When a microgrid is connected to the grid, the operational control of voltage and frequency is done entirely by the grid; however, a microgrid still supplies the critical loads at PCC, thus, acting as a PQ bus