Voltage Regulation in Microgrids via Modulation Communication: A Distributed Output Consensus Approach

Lately, voltage regulations for distributed generation (DG) in direct current (DC) microgrid (MG) have been extensively investigated based on various communication methods. However, the communication is not always reliable or even nonexistent in actual remote area. In this paper, a distributed coordinated voltage control strategy based on power/information hybrid modulation without additional communication lines is proposed. First, the whole state-space model in DC MG under double carriers differential phase shift keying (DC-DPSK) modulation method is constructed. Then, distributed dynamic output feedback control strategy is designed according to established model. The designed distributed control can address leader-following consensus issue in linear heterogeneous time delay multi-agent system which is equal to solve output voltage consensus issue in DC MG. Finally, the effectiveness and potential of the proposed design strategy is verified by simulation results.Note to Practitioners—Output voltage is the vital index for evaluating the quality of power system. Although various accomplishments have been achieved in the area of voltage regulation, the study of voltage regulation control without extra communication lines is rarely considered in DC MG. To fill in the gap, the paper concentrates on designing output feedback consensus control method under DC-DPSK modulation communication to ensure the stability and output voltage consensus in power system. It is worth noting that proposed control strategy based on multi-agent algorithm can be implemented distributed performance without additional communication lines, which is practical in real application. The results aim to provide a helpful reference for secondary control design in the remote area power system, such that the corresponding application research can be promoted.