The frequency stability of multi-microgrids is easily affected by random load fluctuations and intermittent renewable resources. Additionally, geographically distributed generation equipment usually cannot adopt the “point-to-point” dedicated communication scheme to realize the information exchange considering the construction and computation costs. Therefore, a H_∞-switching frequency control strategy for multi-microgrids based on edge computing framework is proposed in this paper. Firstly, an edge computing device is set up in each microgrid to collect the operation statuses of local participating equipment and generate the control instructions to ensure the real-time local frequency stability. Secondly, the multihop data transmission process in edge computing environment is described as a cascade queuing model. Then, the frequency control system in each microgrid is described as a switching model dependent on the varying time delays. Finally, via constructing a Lyapunov function, the constraints of the controller gains ensuring the H_∞-damping performance for external load demands and the renewable outputs are derived at the same time. Simulation results show that compared with the traditional centralized control schemes, the peak value of our proposed edge computing framework is reduced by 32.51% compared with the traditional centralized control scheme. Moreover, under the same edge computing framework, the integral of absolute error (IAE) of frequency with the proposed H_∞ control strategy can be reduced by 37.19% at least. Therefore, a better transient performance can be obtained with our proposed method.

中文翻译：

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基于边缘计算和H∞切换的网络控制，具有时滞的多微电网的频率控制

随机负载波动和间歇性可再生资源很容易影响多微电网的频率稳定性。另外，考虑到建设和计算成本，地理上分散的发电设备通常不能采用“点对点”专用通信方案来实现信息交换。因此，ħ _∞提出了一种基于边缘计算框架的多微电网开关频率控制策略。首先，在每个微电网中设置一个边缘计算设备，以收集本地参与设备的运行状态并生成控制指令，以确保实时本地频率稳定性。其次，将边缘计算环境中的多跳数据传输过程描述为级联排队模型。然后，将每个微电网中的频率控制系统描述为依赖于变化的时间延迟的切换模型。最后，通过构造Lyapunov函数，控制器增益确保的制约ħ _∞同时获得外部负载需求的阻尼性能和可再生输出。仿真结果表明，与传统的集中控制方案相比，本文提出的边缘计算框架的峰值降低了32.51％。此外，同样的边缘计算框架下，与所提出的频率的绝对误差（IAE）的积分ħ _∞可由37.19％至少减少控制策略。因此，使用我们提出的方法可以获得更好的瞬态性能。