Nowadays, the current energetic scenario, mainly based on centralised energy production and concentrated in big generation plants, is undergoing a progressive evolution towards a decentralised model, known as “distributed generation" (DG), composed of many production centres that make almost exclusive use of low-power renewable-energy sources. In this frame, electrical Microgrids (MG) are DG systems that allow “islanding”: the possibility of disconnection from the main grid, without interrupting generation in the microgrid. Switching correctly into islanding requires developing novel control and management systems, in order to provide some level of intelligence to the microgrids. Consequently, this thesis proposes a solution based on a hierarchical management system for microgrids, which includes a Microgrid Central Controller (CCMG) in the top level of the hierarchy, and several load controllers and micro-source controllers. All those controllers, simple and low cost, are equipped with SimpliciTI (a version of ZigBee) protocol based wireless communications. In addition, some passive algorithms to detect islanding are analyzed, in order to study their limitations, and to be compared with the active algorithms. The experimental results demonstrate, from the measured electrical parameters and from the data transmission speed, that the proposed MG controllers work properly.