Distributed control strategy of DC microgrid based on consistency theory

Abstract

In order to solve the cooperative control problem among multiple distributed units in a distributed DC microgrid, a distributed control based on a consensus algorithm is firstly proposed, which can realize power distribution among distributed units. The distributed voltage control of the observer will generate steady-state errors due to problems such as time delay initial value of the observer. A voltage optimization control strategy based on the PI consistency algorithm is further proposed, which converts the voltage control problem into an optimization problem, and the optimization goal is to ensure the deviation sum of each busbar from the rated value is the smallest, and the stability of this method is proved. Finally, the effectiveness of the proposed method is verified by MATLAB/Simulink software.

Keywords

• DC microgrid
• Distributed optimal control
• Consensus algorithm
• Multi-agent system