基于修正余弦相似度的电力系统输电线路差动保护方法

Differential protection method for power system transmission line based on modified cosine similarity

5G无线通信技术为差动保护提供了新途径,然而5G技术存在数据丢失、时延等问题,这对输电线路差动保护判断的准确性和响应的快速性产生影响.为了解决上述问题,该文提出一种基于修正余弦相似度的电力系统输电线路差动保护方法.仿真分析结果表明:该文方法可快速判断输电线路故障的发生,并准确识别线路故障类型;该文方法在噪声环境下能对线路故障进行有效判断;相对于余弦相似度及Pearson相似度的差动保护方法,该文方法对数据丢失的敏感度更低、差动保护可靠性更高.

The 5G wireless communication technology provides a new approach for differential protection.However,5G technology faces problems such as data loss,delay,etc.,which affect the accuracy of differential protection judgment and response speed of transmission lines.To solve these problems,a differential protection method for power system transmission line based on modified cosine similarity was proposed in this paper.Simulation analysis results showed that this method could quickly determine the occurrence of transmission line faults and accurately identify the fault types.The proposed differential protection method could effectively judge line faults in noisy environments.Compared with differential protection methods based on cosine similarity and Pearson similarity,the proposed method had lower sensitivity to data loss and higher reliability for differential protection.