锦苏特高压直流输电工程系统试验研究和实践

Research and Practice of System Test for ±800kV UHVDC Power Transmission Project from Jinping to Suzhou

概述了锦屏—苏南(简称锦苏)±800 kV特高压直流输电工程系统试验结果。针对特高压直流主回路46种接线方式进行了研究,确定了系统试验方案分为单换流器、单极、双极和融冰接线方式4部分内容,编制了系统试验方案;针对锦苏送端锦屏侧孤岛运行方式进行了研究,解决了孤岛方式试验过程中发生的频率振荡问题,完成了孤岛运行方式系统试验;对融冰接线方式系统试验进行了研究,解决了系统试验中融冰方式的技术问题,确定了融冰接线方式系统试验项目,顺利完成了融冰接线方式系统试验;对系统试验过程中发现的主要技术问题进行了分析,内容包括:苏州站极I控单元跳闸试验,造成锦屏站中性母线避雷器损坏问题的分析;锦屏站极II高端换流器跳闸闭锁后,低端换流发生跳闸问题分析;锦屏站交流滤波器频繁投切问题分析;苏州站5 612滤波器断路器C相损坏事件分析等。这些问题的解决保证了锦苏特高压直流输电工程系统调试的顺利进行和按期投入运行。

An overview of system test results of ＋800 kV UHVDC power transmission project from Jinping to Suzhou is given. 46 kinds of main circuit connection modes for UHVDC power transmission were researched, and it was determined that four main circuit connection modes should be included in the system test scheme： the connection mode for single converter, the monopole connection mode, the bipolar connection mode and the main circuit connection trader de-icing operating mode, and corresponding system test schemes were drafted. The islanded operation mode of Jinping side at the sending end of ＋800 kV UHVDC power transmission project from Jinping to Suzhou was researched to solve the frequency oscillation phenomenon occurred in the testing process of islanded operation mode, thus the islanded operation mode was completed; to solve technological problems related to de-icing modes in the system test, the items to be performed during system test of main circuit connection mode under de-icing operation was researched and determined, then the system test on main circuit connection mode for de-icing process was successfully completed. Main technical problems discovered during the system test were analyzed： the damage of neutral bus arrester in Jinping converter station due to the trip test of pole one valve control unit （VCU） in Suzhou converter station, the trip-out of low-voltage converter due to trip blocking of high-voltage converter of pole two in Jinping converter station, the frequent switching on/off of AC filter in Jinping converter station and the damage of phase C in circuit breaker for 5612 filter in Suzhou converter station, and so on, the solution of these problems ensured the successful commissioning of ＋800 kV UHVDC power transmission project from Jinping to Suzhou and putting it into operation on schedule.