±800 kV特高压复龙换流站西门子大组件换流阀饱和电抗器陷分析与改造

Defect Analysis and Modification of Saturable Reactor in Siemens Converter Valve of ±800 kV UHVDC Fulong Converter Station

摘要:

±800 kV复龙换流站双极四阀组换流器采用西门子技术大组件换流阀，其饱和电抗器结构复杂、可靠性低，运行时冷却管路极易漏水，多次导致阀组闭锁。文中在分析西门子阀电抗器典型缺陷的基础上，结合特高压直流输电工程实际，设计研制了一种西门子换流阀用新型一体式饱和电抗器，并成功应用于复龙站换流阀电抗器改造。试验结果表明：新型饱和电抗器采用的单线圈和单管路设计，既保持了电抗器外部电气性能、冷却水流量特性、安装结构尺寸及重量等基本不变，还显著提高了电抗器冷却水路的可靠性，也降低了运行振动受力及噪声水平，可满足特高压直流工程技术与应用需要；对于提高换流阀设备本质安全、保障直流系统能量可用率具有重要的工程价值。

关键词:直流输电;换流阀;饱和电抗器;漏水;缺陷改造

Abstract:

The saturable reactor in Siemens converter valve of ±800 kV UHVDC Fulong converter station has complex structure and low reliability, and its water cooling pipeline is easy to leak during operation, which results in the block locking of DC power system for many times. Based on the analysis of typical defects of saturable reactor in Siemens converter valve and combined with the practice of UHVDC transmission project, a new saturable reactor for Siemens converter valve is designed and developed, which has been successfully applied to the reactor modification of converter valve in Fulong converter station. The test results show that because single winding and single cooling pipeline is designed for the new saturable reactor, not only the external electrical performance, cooling water flow characteristics, structure size and weight of the reactor basically keep unchanged, but also the reliability of cooling water circuit of the reactor is significantly improved, and the operating vibration stress and noise level of the reactor are reduced, which can meet the technology needs of UHVDC transmission project. It has very important engineering application value for improving the intrinsic safety of converter valve equipment and ensuring the energy availability of DC power system.

Key words:HVDC transmission; converter valve; saturable reactor; water leakage; defect modification