Networked-based distributed cooperative voltage control for power electronics interfaced microgrids

Abstract

This paper develops a distributed cooperative voltage control scheme involving primary and secondary voltage control for an autonomous microgrid (MG). The proposed distributed control algorithms are able to implement the fully local communication and control function among the inverter-based distributed energy resources (DERs) at the secondary stage. Moreover, it will not only regulate the voltage of DERs to the desired values but also achieve reactive proportional power sharing via a robust communication network with time-varying delays. The criteria for the stability analysis and delays boundedness of autonomous microgrids are derived. Steady-state performance analysis via the simulation of a autonomous microgrid test system shows that the proposed distributed voltage control algorithms not only are viable to accurately deal with the global voltage regulation and proportional reactive power sharing, but also is very robust with respect to communication delays and switching network topologies.