孤岛微电网在独立运行时易受多重干扰影响，可再生能源出力波动与负载波动会破坏功率平衡，引发电压和频率偏移；长距离通信以及网络堵塞会导致控制指令传输时延，降低二次控制实时性。为解决上述问题，提出了一种基于动态事件触发机制的固定时间分布式二次控制算法（dynamic event-triggered mechanism，DETC-P）。针对周期性干扰，运用H_∞鲁棒控制策略增强干扰抑制性；针对通信时延问题，采用模型降阶技术简化分布式发电单元的动态模型提高时延补偿效率。所提出的动态事件触发基于电压与频率的偏差动态调整触发阈值，在保证事件触发间隔下限的前提下显著降低了节点间的通信负担，并避免了Zeno行为。最后，构建了孤岛微电网的系统模型并进行仿真实验验证了所提算法的可行性。

Isolated microgrids are susceptible to multiple disturbances while they are operating independently. Fluctuations in renewable energy outputs and load variations can distrupt power balance, causing voltage and frequency deviations. And long-distance communication and network congestion may induce control command transmission delays that compromise the real-time performance of secondary control. To address these challenges, a fixed-time distributed secondary control algorithm based on a dynamic event-triggered mechanism（DETC-P） is proposed. To counter periodic disturbances, an H_∞ robust control strategy is adopted to strengthen disturbance rejection capability.For communication delay issues, model order reduction techniques are employed to simplify the dynamic models of distributed generation units, enhancing delay compensation efficiency. The proposed dynamic event-triggering mechanism adaptively adjusts triggering thresholds based on voltage and frequency deviations, significantly reducing communication burden between nodes while ensuring a lower bound on event-triggering intervals and avoiding Zeno behavior. Finally, a system model of the islanded microgrid is constructed, and simulation experiments are conducted to validate the feasibility of the proposed algorithm.