禄高肇直流一送二方式下三站解锁和第三站投入导致直流闭锁原因分析

Causes Analysis of DC Blocking Caused by the Unlocking of Three Stations and the Operation of the Third Station in Lugaozhao DC One-to-Two

介绍了三端直流一送二方式下三站解锁和第三站投入功能,并以±500 kV禄高肇直流在进行极2金属回线解锁闭锁性能试验(一送二)时,三站解锁过程中高坡站ESOF为实例,分析了高坡站闭锁的原因,阐明了三端直流在一送二方式下三站解锁和第三站投入功能设计上存在的缺陷,进而提出了改进措施,为直流输电工程的设计和运行提供借鉴。

The three-station unlocking and third-station operation functions under the three-terminal DC one-to-two mode are introduced.Taking the ESOF of Gaopo station during the unlocking process of the three-station using the±500 kV Lu Gaozhao DC in the extreme 2 metal loop unlocking performance test(one-to-two)as an example,the reasons for the Gaopo station latching are analyzed.The defects in the design of three-terminal DC unlocking and third station operation function under the one-to-two mode are clarified,and then improvement measures are proposed to provide reference for the design and operation of HVDC transmission projects.