Distributed Finite- Time Secondary Voltage Control of Microgrid

Stable voltage is one of the important indicators of power quality in microgrid. This paper presents a distributed secondary control method based on multi-agent consistency algorithm to remove the voltage deviation caused by droop control. It realizes the adjustable trade-off between two conflicting control objectives (i.e. voltage regulation and power sharing). Using this method, each DG collects the information of local voltage and active power to complete the secondary control with the adjacent DGs, which conserves communication resources. Besides, the voltage can be restored to the nominal value, and the active power can be distributed precisely according to the droop coefficient of each DG under various conditions in finite time. The finite-time stability of microgrid is proved by Lyapunov theory, and the effectiveness of the proposed method is verified by simulation of four DGs built in Matlab/Simulink.