Dynamic event-triggered fixed-time secondary control of islanded microgrids

Conventional microgrids that employ droop control may experience challenges related to frequency and voltage offsets, which can pose risks to power system safety. Furthermore, the use of continuous communication in traditional control systems can result in technical and financial challenges. This paper introduces a fixed-time dynamic event-triggered secondary control for islanded microgrids, designed to achieve frequency restoration, voltage regulation and active power sharing within a specified timeframe. This distributed control approach relies solely on information from each distributed generator(DG) and its neighbours. Each DG receives communication from its neighbours and concurrently broadcasts its own information only when certain deviation were reached, thereby minimising communication costs. Several simulated instances illustrate the usefulness and robustness of this control method, including scenarios involving load changes, time delay and topology switching.

采用下垂控制（droop control）的传统微电网常面临频率与电压偏移问题，该问题会对电力系统安全构成威胁。此外，传统控制系统采用持续通信的设计思路，会引发技术与经济两方面的难题。本文提出一种面向孤岛微电网的固定时间动态事件触发式二次控制策略，旨在实现指定时间范围内的频率恢复、电压调节与有功功率分配。该分布式控制方案仅依托各分布式发电机（distributed generator，DG）及其邻机的本地信息，各DG仅在达到特定偏差阈值时，接收邻机的通信信息并同步广播自身状态数据，由此最大限度降低通信开销。多组仿真案例验证了该控制方法的有效性与鲁棒性，涵盖负荷变化、时滞以及拓扑切换等多种场景。