Dynamic event-triggered protocol-based distributed secondary control for islanded microgrids

This paper proposes a distributed secondary control scheme with dynamic event-triggered protocol for multiple distributed generators (DGs) in an islanded microgrid. First of all, a dynamic event-triggered (DET) protocol is introduced for each DG unit to orchestrate the information transmission, which aims to save communication resources in the microgrid. The proposed event-triggered condition involves an internal dynamic variable, which is employed to dynamically adjust the event-triggered threshold. Then, under the schedule of the DET protocol, the distributed secondary controllers of the DGs are designed on the basis of the available information. The proposed secondary control scheme is completely distributed, which means that each DG only needs the information from itself and its neighbors, which reduces the requirements for the central controller and complex communication networks, and improves the reliability of the system. Meanwhile, it is proved that there is no Zeno behavior in the closed-loop system and the lower bound of the interevent time is enlarged due to the introduction of the dynamic event-triggered protocol. Subsequently, the similar idea is employed to deal with the distributed secondary frequency and load sharing problems. Finally, an illustrative example is utilized to verify the effectiveness of the proposed control scheme by using the MATLAB/SimPowerSystems toolbox.