从西换流站加装隔直装置对直流控制保护及换流变保护的影响  

Effect of Installing DC Isolation Device in Congxi Converter Station on DC Control Protection and Converter Transformer Protection

作　　者：黄金军[1] 肖建民[1] 徐斌[1] HUANG Jinjun;XIAO Jianmin;XU Bin(Nanjing NR Electric Co.,Ltd,Nanjing 211106,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211106

出　　处：《电工技术》2020年第14期91-94,共4页Electric Engineering

摘　　要：溪洛渡直流工程从西换流站由于受到附近换流站大地回线运行的影响,换流变中性线流入直流电流,导致换流变保护发出饱和告警。为隔离换流变中性线直流电流,需在换流变中性线加装隔直装置。文章结合隔直装置原理,从理论上对隔直装置对换流变保护、直流保护及直流控制的影响进行分析,通过RTDS对隔直装置进行建模并将其加入直流控制保护仿真系统中,选取适当的仿真试验项目,在同一工况下对投入隔直装置和不投入隔直装置分别进行仿真,通过对两者相应波形进行对比分析以评估隔直装置对直流控制保护系统及换流变保护带来的影响。In the Congxi converter station of Xiluodu DC project, due to the influence of the operation of the earth return line in the nearby converter station, the converter neutral line flows into the DC current, causing the converter protection to send out saturation alarm. In order to isolate the DC current of the converter neutral line, it was necessary to install a DC isolation device on the converter neutral line. Based on the principle of the isolation device, the influence of the isolation device on the converter protection, DC protection and DC control were analyzed. Through RTDS to model the isolator and added it into the DC control protection simulation system, the appropriate simulation test items were selected. Under the same working condition, the input of the isolator and the non-input of the isolator were simulated respectively. Through the comparative analysis of the corresponding waveforms of the two, the impact of the isolator on the DC control protection system and the converter protection was evaluated.

关 键 词：换流站 隔直装置 控制保护 RTDS试验 

分 类 号：TM721.1[电气工程—电力系统及自动化]