特高压直流换流变压器分接头自动再同步控制策略  

Automatic Re-synchronization Control Strategy of UHVDC Converter Transformer Taps

作　　者：时伟光 成小胜 郝成龙 李平伟 赵宇亭 任春光[2] SHI Weiguang;CHENG Xiaosheng;HAO Chenglong;LI Pingwei;ZHAO Yuting;REN Chunguang(State Grid Shanxi Electric Power Company Maintenance Branch,Taiyuan 030000,China;Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]国网山西省电力公司检修分公司,太原030000 [2]太原理工大学,太原030024

出　　处：《高压电器》2024年第5期108-116,共9页High Voltage Apparatus

基　　金：国网山西省电力公司科技项目(SGSXJX00YMJS2000352)。

摘　　要：特高压输电技术承载着新能源远距离输送的重要任务,是助力“双碳目标”达成的有力支撑,然而,受新能源上网功率波动的影响,特高压直流输电系统中送电端换流变压器分接头动作次数频繁,严重影响换流变压器使用寿命。为减少分接头动作次数,文中建立了直流输电电流、晶闸管触发角及分接头档位等关键影响因子之间的数学关系,在分析现有分接头控制策略不足的基础上,提出面向特高压直流输电系统的同极换流变压器分接头自动再同步控制策略。以雁淮特高压直流输电系统为例,通过数学推导及MATLAB/Simulink仿真,对传统策略和改进策略进行对比。结果表明所提策略有效降低分接头动作次数,提升特高压直流输电系统运行质效。UHVDC power transmission technology undertakes the important task of long-distance transmission of new energy,which can be a strong support to the‘dual Carbon goal’.However,due to the fluctuation of new energy power,the converter transformer taps at the transmission end of the UHVDC transmission system operates frequently,which seriously affects the service life of the converter transformer.For reducing the number of operations of the tap,the mathematical relationship among such key influencing factors as DC transmission current,thyristor firing angle and tap gear are set up in this paper and,on the basis of the analysis of the insufficient existing tap control strategy,a new method of automatic resynchronization control strategy for the taps of pole converter transformers for UHVDC transmission system is proposed.Finally,the Yanhuai UHVDC transmission system is taken as an example,the traditional and improved strategy are compared by mathematical derivation and MATLAB/Simulink simulation.The results show that the proposed strategy can effectively reduce the number of tap operations and assure reliable operation of the UHVDC transmission system.

关 键 词：特高压直流输电 新能源消纳 换流变分接头 优化控制 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM41