Stability of DC Microgrid for Different Reduced Communication Topologies

Distributed secondary controllers for dc microgrid require information exchange between the sources. The information exchange is achieved by either a full communication or a reduced communication topology. Using consensus control, a good performance can be achieved in dc microgrid with reduced communication. However, the effects of communication topology on system stability is not analyzed in detail in literature. For a given power network, various reduced communication topologies are possible. The stability of system depends on communication network topology and the power network parameters. This paper investigates stability of dc microgrid for different communication topologies. Equations for the system with the secondary controller using reduced communication is derived and state space model is analyzed to see the effect of communication topology on the stability of the system. Results are validated through MATLAB/Simulink based simulations.