基于5G边缘计算的有源配电网区域保护方法

5G-enabled edge computing-based zone protection method for active distributionnetworks

摘要

随着有源配电网中分布式电源的渗透率逐渐升高,传统的继电保护方法面临可靠性降低、灵敏性不足等一系列问题,因此,本文提出一种在5G边缘计算赋能下的基于正、负序故障特征的区域保护方法。首先,分析了有源配电网发生不对称故障时的负序电压及功率方向特征和对称故障时的正序电流及功率方向的特征,并根据有源配电网的故障特征,结合含分布式电源接入点位置的关联矩阵,基于有源配电网不对称故障的负序故障特征和对称故障的正序故障特征,提出了2种区域保护动作判据;其次,构建云-边-端区域保护通信架构,通过5G通信技术将端层采集的数据传输至边缘层,边缘层根据区域保护动作判据完成故障线路的判断;最后,在MATLAB/Simulink仿真平台搭建基于IEEE 33节点系统的有源配电网,并进行仿真分析及验证,结果表明:在单侧保护的线路中的区域保护方法能准确地判断出故障线路,并且不受有源配电网拓扑结构变化的影响。

Abstract

With the gradually increasing penetration of Distributed Generation in active distribution networks, traditional relay protection methods are facing a series of problems such as reduced reliability and insufficient sensitivity, therefore, this paper proposed a zone protection method based on positive and negative sequence fault characteristics empowered by 5G-enabled edge computing. First, the characteristics of negative sequence voltage and power direction when asymmetrical faults occur in active distribution networks, the characteristics of positive sequence current and power direction when symmetrical faults occur were analysed, based on the fault characteristics of active distribution networks, combined with the association Matrix containing the location of distributed generation access points, two types of area protection action criteria were proposed based on the negative sequence fault characteristics of asymmetrical faults and the positive sequence fault characteristics of symmetrical faults in active distribution networks. Secondly, the cloud-edge-end regional protection communication architecture was constructed, the data collected at the end layer was transmitted to the edge layer through 5G communication technology, and the edge layer completes the judgment of the faulty line according to the regional protection action criterion. Finally, an active distribution network based on the IEEE 33-node system was built in the MATLAB/Simulink simulation platform for simulation and verification, and the simulation results show that the proposed zone protection method can accurately judge the faulty line in the single-side-protected line and is not affected by the change of the topology of the active distribution network.

关键词

5G / 边缘计算 / 有源配电网 / 区域保护

Key words

5G / edge computing edge computing / active distribution network / zone protection

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基金资助

新疆生产建设兵团指导性科技计划项目(2023ZD059),新疆生产建设兵团科技计划项目(2022CD016)