变电站直流电源绝缘监测系统的改造分析  

Analysis of Transformer Substation DC Power Insulation Monitoring System Transformation

作　　者：解红刚 XIE Honggang(Inner Mongolia Electric Power(Group)Co.,Ltd.,Inner Mongolia EHV Power Supply Company,Hohhot 010080,China)

机构地区：[1]内蒙古电力(集团)有限责任公司内蒙古超高压供电分公司,呼和浩特010080

出　　处：《电力学报》2024年第3期248-254,共7页Journal of Electric Power

基　　金：内蒙古电力公司主网技改项目(20230043,20230044)。

摘　　要：直流电源系统是变电站重要的公共系统,为全站运行的各种继电保护及安全自动装置提供工作电源,为控制系统提供稳定的操作电源。随着设备运行年限的增长以及配电网运行新技术的发展,绝缘监测系统的问题凸显,难以满足电力系统发展的需求。为保证直流电源系统安全稳定运行,综合分析了绝缘监测系统的现状和存在的问题,通过对传感器技术、数据采集和传输技术的优化方法,以及对数据处理和分析算法改进等方面进行研究,提出了基于快速傅里叶变换算法的纹波监测方法、交流窜入直流监测手段以及直流母线监测方法的优化方案。通过现场试验以及系统仿真,证明了改造后的监测系统能够更准确地监测绝缘状态的变化。与传统绝缘监测系统相比,改造后的绝缘监测系统具有更高的可靠性和准确性,提升了系统整体性能,强化了电力系统的可靠性和安全性。同时探讨了绝缘监测系统改造重点环节,为同类变电站改造提供了参考案例。The DC system is a critical common system in substations,providing working power for station-wide protection and safety automatic devices,as well as stable operating power for control systems.As equipment ag-es and insulation monitoring technology advances,issues with insulation monitoring systems have become more frequent,making it increasingly difficult to meet the demands of the power system.To ensure the safe and stable operation of the DC system,this paper conducts a comprehensive analysis of the current status and existing prob-lems of insulation monitoring systems.By optimizing sensor technology,data collection and transmission tech-nologies,and refining data processing and analysis algorithms,this paper proposes improvements such as opti-mizing ripple monitoring methods using the fast fourier transform algorithm,monitoring AC leakage into DC,and enhancing DC bus monitoring methods.Through field experiments and system simulations,the upgraded system can more accurately monitor changes in insulation status,demonstrating higher reliability and precision compared to traditional systems.This ultimately boosts the overall performance of the insulation monitoring sys-tem,fortifying the reliability and safety of the power system.The paper also delves into key aspects of insulation monitoring system transformation,offering guidance for similar substation renovations.

关 键 词：变电站 直流电源 绝缘监测系统 K‒means聚类算法 纹波监测 交流窜入直流 

分 类 号：TM73[电气工程—电力系统及自动化]