A Review of the Primary-Control Techniques for the Islanded Microgrids

The growing interest in sharing the renewable-energy resources in power microgrids presents major challenge from the perspective of reliable operation and control of the power systems. The issue of the microgrids autonomous control has received a considerable attention in the last decade. As the architecture of the power system control, a hierarchical control scheme can be implemented for the islanded microgrids. So far, various concepts for the hierarchical control of the microgrids have been developed. In this paper, the most up-to-date primary control techniques for an autonomous operation of the microgrids are presented and droop-based and non-droop-based power-sharing approaches are comprehensively compared. The simulation results are used to improve and support the concept of the droop-based primary control in an islanded mode. Finally, a brief summary and a critical assessments of the findings are given.