A Dynamic Diffusion Algorithm for DiscreteTime Cooperative Control for DC Microgrids

Voltage restoration and current sharing are crucial issues for the secondary control in dc microgrids (MGs). Distributed control has been widely employed as an effective approach for the secondary control, where different algorithms can be used in the communication network. In this paper, a dynamic diffusion algorithm (DDA) is introduced to the distributed secondary control of the dc MG. Considering the digital implementation of controllers and communication algorithms, a discrete model of the whole system is established. Compared with traditional schemes, the proposed method can improve the dynamic response and stability of the system. The advantages of the proposed DDA over traditional consensus and diffusion algorithms are given in terms of both the algorithm itself and its application in the dc MG, with a rigorous mathematical derivation. Finally, the effectiveness of the proposed DDA and corresponding analytical results have been verified by experiments on a laboratory dc MG.