Distributed secondary control for DC microgrid under the adaptive event-triggered protocol

Abstract

This paper considers the distributed secondary control for direct current (DC) microgrid to regulate the DC bus voltage containing local loads. An adaptive event-triggered protocol is employed to update the control input to save transmission energy and ensure the control performance. Depending on the switch of the converter, a switching dynamical equation is proposed to describe a microgrid with a DC–DC boost converter. Moreover, the Lyapunov technique is developed to assure the stability of the system, which effectively handles real-time precision of input and model uncertainties. Combining this method with proportionate load sharing enables global average voltage management and the system performance preservation in DC microgrids for a variety of disturbances. Finally, the effectiveness of the proposed method is verified by simulation.