Analysis and design of voltage control and coordinate strategy in DC microgrid under multiple operation conditions

Abstract

Considering multiple operation condition in DC microgrid, a bus voltage control strategy with terminal coordination is proposed in this paper, which could stabilize the bus voltage in extreme operation condition through receiving the operation information and issuing commands to every terminal. The equivalent circuit of DC microgrid is established and analysed, which can provide instruction on voltage control. During control strategy designing, the operation modes and switching criteria under multiple conditions are made. Accordingly, terminals coordinate control and flow chart of selection are introduced in this paper. Finally, DC microgrid model with loop topology with four terminal ports is built in MATLAB/Simulink to validate this strategy, and experiment results will be added in final paper.