In the traditional electric grid, the power flow is unidirectional from the centralised big generation plants to a large number of dispersed end-users. Nowadays, the energy market liberalisation has permitted customers not only to consume electricity, but also to generate and sell it. As a consequence, the number of small generation systems that are connected at the distribution line level is continuously increasing. The increasing penetration of this generation systems, called Distributed Generation (DG) is changing the perspective of the grid from a centralised to a decentralised one and creates several challenges that must be carefully addressed in order to keep the proper operation of the electric grid. To take into account all those challenges, a solution capable of guaranteeing a controlled injection of the power generated by DG must be defined. The μGrid is being analysed as a solution to these issues. From the grid point of view, a μGrid can be regarded as a controlled entity that can be operated as a single aggregated load or even as a small power source or ancillary service supporting the network. From the customer's point of view, a μGrid provides enhanced power quality and reliable energy supply. The most important characteristic of a μGrid is its ability to operate in grid connected or islanding mode. The attention focuses on the power converters and control designed to improve power quality and stability during grid connected and islanding operation of the μGrid.< Réduire