500kV直流融冰兼动态无功补偿系统研发与工程试点

Research and Pilot Project of DC Deicer-SVC System for 500 kV Transmission Lines

介绍了以金华500 kV双龙变电站为工程试点的500 kV直流融冰兼动态无功补偿系统,叙述了可控整流器型直流融冰兼动态无功补偿装置、融冰专用直流母线及移动式母线连接器的原理、结构、功能与特点。该系统采用多项专利技术,具有在直流融冰与无功补偿2种工作模式之间切换时不改变直流融冰兼动态无功补偿装置内部主电路和控制程序结构,只需通过外部隔离开关矩阵的简单切换操作,即可在对电网运行影响最小的前提下实现工作模式切换,以及融冰模式下同一线路不同相别或不同线路之间的平衡(循环)融冰切换操作等突出优点。

This paper introduces the DC deicer-SVC system in a pilot project in Shuanglong 500 kV Substation of Jinhua, Zhejiang Province. The principles, structures, functions and features of the controlled rectifier based DC deicer-SVC installation, deicing DC bus and mobile bus-connector are illustrated in detail. Supported by several proprietary technologies, this system can work in ＂deicer mode＂ or ＂SVC mode＂, which can be switched by simple operations of external isolating switch matrix, without changing the internal main circuit and control program of the installation. This means the impact on power grid is minimized when the system changes work modes, or balance de-ices （circle de-ices） for conductors of different lines and different phases of one line in ＂deicer mode＂.