Optimal Droop Control for Voltage Source Converters in Islanded Microgrids

A new procedure for the design of the droop control for voltage source converters (VSC) in islanded microgrid is presented. The droop control is commonly used to achieve the power balance in power system. It consists in a simple proportional control and the selection of its gains are commonly based only on a power balance criteria. However, some values of the gains may cause poor damped responses and even the instability of the system. In this paper, it is proposed a new droop control based on the parametrization of the H∞ controller which permits to decouple the stability problem from the power balance. The application of the new controller is illustrated by simulation.