Black start studies for micro-grids with distributed generators

With the development of distributed generation technologies, the reliability of Islanded distribution systems containing distributed generators (DG) increased gradually, which make it possible to use a distributed generator as black start unit when a general or local blackout occurs. In this paper, a low voltage distribution network with several kinds of distributed generators is established based on Matlab® Simulink® simulation platform. Through numerical simulations, a basic control strategy for micro-grid system restoration is summarized. And through three major steps, a method to define an automatic procedure for MG restoration can be obtained: establish an optimization model to determine the black start capability; assess each black start scheme considering two main factors, low voltage distribution network building time and minimum load power factor during the black start procedure; verify relative effective schemes by simulations and chose the best feasible black start scheme.