整流侧大容量变压器充电对高压直流输电工程运行影响分析及改进措施研究  

Research on Analysis and Improvement Measures of the Impact of Large-Capacity Transformer Charging on Rectifier Side on the Operation of HVDC Transmission Project

作　　者：陈慧 刘宁[1] CHEN Hui;LIU Ning(Qujing Bureau of CSG EHV Power Transmission Company,Qujing 655000,China)

机构地区：[1]中国南方电网公司超高压输电公司曲靖局,云南曲靖655000

出　　处：《电工技术》2023年第3期115-118,共4页Electric Engineering

摘　　要：大容量变压器充电过程中产生的励磁涌流是交流系统常见的二次谐波来源之一,因高压直流输电工程固有运行特性,整流侧交流系统100 Hz谐波分量经直流换流阀转变后在直流侧呈现为50 Hz谐波分量,在直流线路谐波放大作用下,极易引发逆变站50 Hz谐波保护误动,甚至导致高压直流输电工程多回、多极闭锁,故在工程规划设计阶段需全面充分评估整流侧交流系统大容量变压器、换流变压器充电对直流工程运行的影响,同步策划解决方案。以某直流工程整流站换流变压器充电及整流侧交流系统电厂主变充电期间逆变站两起50 Hz保护动作为例,详细分析了保护动作原因,明确了整流侧大容量变压器、换流变压器充电对该直流输电工程安全运行的影响,并提出了后续运维建议及彻底整治措施研究的技术路线。The excitation inrush current generated during the charging process of large capacity transformers is one of the common sources of second harmonics in AC systems.Due to the inherent operation characteristics of HVDC transmission project,the 100 Hz harmonic component of the AC system on the rectifier side presents a 50 Hz harmonic component on the DC side after being transformed by the DC converter valve.Under the action of harmonic amplification of DC lines,it is easy to cause the 50 Hz harmonic protection misoperation of the inverter station,and even lead to multi-loop and multipole blocking of HVDC transmission projects.Therefore,in the stage of engineering planning and design,it is necessary to fully evaluate the impact of large capacity transformer and converter transformer charging of the rectifier side AC sys-tem on the DC engineering operation,and plan the solution synchronously.T aking the charging of converter transformers in a rectifier station of a DC engineering and two 50 Hz protection actions of inverter stations during the main transformer charging of the AC system power plant on the rectifier side as an example,the reasons for the protection actions are analyzed in detail,and the impact of large capacity transformer and converter transformer charging on the rectifier side on the safe operation of the DC transmission project is clarified.The following operation and maintenance suggestions and the technical route for the study of thorough rectification measures are put forward.

关 键 词：励磁涌流 50 Hz保护 选相装置 运维建议 谐波抑制 

分 类 号：TM41[电气工程—电器]