西北750kV输变电示范工程投运初期运行特点

Analysis of operation characteristics in initial operation stage for 750 kV transmission pilot project in Northwest China

西北电网750kV输变电示范工程(简称750kV工程)是我国电压等级最高的输变电工程,也是世界上这一电压等级输变电工程中海拔最高的工程。750kV工程的成功投运,标志着我国电力设备制造和电网运行控制技术达到了世界先进水平,也为充分利用西北地区丰富的能源,加快资源优势向经济优势转变创造了更好条件。750kV工程投运初期,750kV线路有3种运行方式:750kV线路和330kV线路电磁环网运行、750kV线路单独运行和750kV线路停运。主要对750kV线路各运行方式的特点及存在问题进行了分析,并研究了750kV线路运行对电网稳定的影响问题。研究结果表明,750kV电网建设初期,750kV线路潮流较轻,正常方式下,线路或者变电站设备故障对电网稳定运行的影响不大。

The 750 kV transmission pilot project, which is the first highest voltage transmission line project in China, puts into production successfully. Its completion and operation symbolize that China＇s grid technology and manufacturing level of transmission and transformation equipment has stridden into the world advanced level, and has played an important role in accelerating the development of water and thermal power resources in Northwest China and promoting the optimized allocation of eastern and western energy resources. This paper analyzed the special operation characteristic ofGuanting-East Lanzhou 750 kV transmission line and substations in three operation modes. It is concluded that the 750 kV transmission line has low power flow during the initial operation stage of 750 kV transmission pilot project. And the N- 1 faults on 750 kV transmission line or substations can not cause serious disturbance to Northwest Power System.