Distributed adaptive secondary control for microgrids with time delay and switching topology

As communication delay and topology switching result in a change in dynamic properties of the microgrid control system, the preset control parameters are no longer applicable. To solve this problem, a novel distributed adaptive secondary control algorithm is proposed. First, we introduce the hierarchical control system structure of the microgrid, and the idea of the adaptive parameter adjustment strategy that optimizes the parameters of the secondary controller in time according to the real-time communication and disturbance conditions. Next, the derivation of real-time stability constraint inequalities is subject to time delay and dynamic communication topology, and the proposed method for computing the parameters of the secondary controller are presented in detail. Finally, results of the simulation experiment validate the accuracy of stability analysis and the effectiveness of the proposed adaptive control strategy.