Modelling and simulation of hierarchical control for AC inductive microgrids

Abstract

This paper deals with the design of a hierarchical control system for an AC microgrid (MG). This control has been specifically implemented and validated in simulations for i-Sare MG project [1]. During the last years, great efforts have been done trying to adapt the hierarchical control defined for large power systems to the MG control. In this context, this paper presents and analyzes a four level hierarchical control for MGs based on droop control. Due to inherent drawbacks of droop control, this paper mainly focuses on Secondary and Tertiary control in order to minimize its limitations. For that purpose, simulation models have been implemented based on MG literature but modified and optimized for i-Sare requirements and specifications. These models allow to analyze the MG performance under any set point change. In order to show the reliability of the models, a simplified MG system which is composed of two inverters connected in parallel to the load is simulated and analyzed.