CAJ | 학술논문

特高压直流输电工程融冰接线方式采用极 I 和极 II高端换流器并联接线运行方式。向(家坝)—上(海)和锦(屏)—苏(南)±800 kV直流工程融冰基本控制方式采用并联混合式多端直流输电系统(multi-terminal direct current， MTDC)控制策略，溪(洛渡左岸)—浙(江金华)±800 kV直流工程采用并联换流器电流裕度控制策略。分析特高压直流工程融冰方式控制保护原理和向上、锦苏以及溪浙工程融冰方式系统试验结果，并对融冰接线方式系统试验过程中发现的稳态运行直流电流略大于设定值、直流电流不能稳定运行等问题进行论述和分析，揭示产生问题的原因，提出解决方案，并在向上特高压直流输电工程融冰方式系统试验过程中得到验证。
특고압직류수전공정융빙접선방식채용겁 I 화겁 II고단환류기병련접선운행방식。향(가패)—상(해)화금(병)—소(남)±800 kV직류공정융빙기본공제방식채용병련혼합식다단직류수전계통(multi-terminal direct current， MTDC)공제책략，계(락도좌안)—절(강금화)±800 kV직류공정채용병련환류기전류유도공제책략。분석특고압직류공정융빙방식공제보호원리화향상、금소이급계절공정융빙방식계통시험결과，병대융빙접선방식계통시험과정중발현적은태운행직류전류략대우설정치、직류전류불능은정운행등문제진행논술화분석，게시산생문제적원인，제출해결방안，병재향상특고압직류수전공정융빙방식계통시험과정중득도험증。
De-icing connection of ultra high voltage DC (UHVDC) transmission project consists of Pole 1 and Pole 2 high-voltage converters in parallel connection. Hybrid parallel multi-terminal direct current (MTDC) control was used as de-icing mode control strategy for parallel converters of Xiangjiaba-Shanghai (abbr. XS) and Jinping-Sunan (abbr. JS) ±800 kV UHVDC projects, and current margin control was used as de-icing mode control strategy for parallel converters of Xiluodu Left bank to Jinhua of Zhejiang (abbr. XZ)±800 kV UHVDC project. De-icing mode control and protective principles are analyzed in this paper. De-icing mode test results were analyzed during XS, JS and XZ UHVDC system commissioning tests. During de-icing tests, DC current steady state operation value was slightly larger than setting value, DC current could not be stable. These technical problems were discussed in detail and their causes were analyzed. Solutions of above problems were presented and testified in XS UHVDC transmission project de-icing mode test.