作者:于 洋 ， 汤 伟 ， 叶远波 ， 邵庆祝 ， 杨瑞金 ， 黄玉辉
Authors:YU Yang , TANG Wei , YE Yuanbo , SHAO Qingzhu , YANG Ruijin , HUANG Yuhui摘要:随着大量分布式电源接入配电网 ,配电网逐步转化为多源、多端网络 ,对继电保护性能的要求日益提 高 。电流差动保护十分适用于配电网多源网络故障问题 ,但差动保护依赖光纤通道 ,存在成本高、铺设难度大等问 题 ,难以推广使用 。针对该问题提出 一种基于 5G 通信的配电网差动保护方案 , 旨在利用 5G 通信的低时延、低成本 等优势替代光纤 ,提高配电网差动保护的实用性 。为解决通信时延和时延抖动问题 ,引入了改进动态时间规划 (DTW)算法 。针对传统 DTW 算法开销大、算法精度和效率受限于序列幅值差异、依靠经验选取参数等缺陷 ,提出 了全局路径约束策略、数据标准化策略和粒子群优化策略予以改进 。仿真结果表明 ,基于 5G 通信和改进 DTW 的 配电网差动保护方法具有选择性和速动性 ,在不同场景下能够可靠动作。
Abstract:With a large number of distributed power generations connected to the distribution network, the distribution network has gradually transformed into a multi-source and multi-terminal network, and the requirements for relay protection performance are increasing. Current differential protection is suitable for the problem of multi-source network failure in distribution networks, but differential protection relies on fibre channel, which has problems such as high cost and difficult laying, which is difficult to promote and use. This paper proposes a distribution network differential protection scheme based on 5G communication, which aims to replace optical fiber by using the advantages of low latency and low cost of 5G communication and improve the practicality of differential protection of distribution network. To solve the problem of communication delay and delay jitter, an improved dynamic time programming (DTW) algorithm was introduced. Aiming at the shortcomings of traditional DTW algorithms, such as large overhead, algorithm accuracy and efficiency limited by sequence amplitude difference, and empirical selection of parameters, the global path constraint strategy, data standardization strategy and particle swarm optimization strategy are proposed to be improved. Simulation results show that the differential protection method of distribution network based on 5G communication and improved DTW is selective and fast,and can be reliably operated in different scenarios.

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