基于随机网络演算的分布式能源调控系统时延上界计算

Upper Bound Calculation of Delay of Distributed Energy Resource Coordinated-Control System Based on Stochastic Network Calculus

随着分布式能源的大量接入并网运行,通信延时的可确定性和网络控制成为保证系统稳定运行的关键。该文基于以太网通信的分布式能源系统,采用随机网络演算理论提出传输时延边界计算方法。其通过建立自相似业务流量模型,在网络节点处采用延时保证服务和加权公平排队机制调度算法将随机服务曲线具体化,推导出分布式能源通信业务端到端传输延时边界,有效克服了传统基于排队论仅能计算平均延时而遗漏长延时,造成网络控制失效的问题。最后,通过OPNET仿真软件构建的计及分布式能源物理设备与通信网络紧耦合分析模型的实验,验证了该文提出的随机网络演算时延边界数值计算结果的准确性。研究对精确分析不同通信体系架构的传输特性和分布式能源网络化控制提供了通信层面的理论支撑。

As a large number of distributed energy resources are connected to the grid for operation, the determinability of communication delay and network control become the keys to ensure the stable operation of the system. This paper studied the distributed energy system based on Ethernet communication and proposed a calculation method of transmission delay boundary using stochastic network calculus theory. With the establishment of self-similar traffic model, we use delay guarantee services and weighted fair queuing mechanism scheduling algorithms at the network nodes to concretize the random service curve and derive the end-to-end transmission delay boundary of distributed energy communication network, which could effectively overcome traditional queuing theory that can cause the problem of network control failure due to calculating the average delay only and omitting the long delay. Finally, the accuracy of the numerical calculation results of the delay boundary of the stochastic network algorithm proposed in this paper is verified by experiments that take into account the tightly coupled analysis model of distributed energy physical equipment and communication networks constructed by OPNET simulation software. The research provides an accurate analysis of the transmission characteristics of different communication architectures and provides theoretical support at the communication level for distributed energy networked control.