Generators control systems in intentionally islanded MV microgrids

The aim of the present paper is to describe appropriate control systems for local generators able to correctly manage a microgrid during its transition from a grid-connected to an islanded operation, as well as during its autonomous operation. In order to study the dynamic behaviour of a microgrid including renewable energy-based generation units, control systems for both synchronous generators and inverter-interfaced generation units are developed and implemented in a software environment. The control schemes are designed to allow each type of generator to operate in both grid-connected and islanded modes. In a companion paper the software implementation of a test MV distribution network with a microgrid inside it and the developed generatorspsila control systems is described and simulation results are presented.