750kV伊库线投运对新疆电网安全稳定特性的影响

Impacts of Operation of 750 kV Yili-Kuche Power Transmission Line on Security and Stability of Xinjiang Power Grid

新疆750 kV伊犁—库车输变电工程2016年建成投运后,将形成环天山西段大环网。针对伊库线投运前后新疆电网潮流分布、安全稳定水平、短路电流水平和小干扰稳定性等方面进行了计算分析,同时研究了伊库线投运对重要断面输电能力的提升效果。计算结果表明,伊库线的投运实现了南北疆电力互供、水电与光伏互补的格局,降低了伊苏线跳闸后伊犁地区孤网运行风险,提高了南疆电网的功角稳定性和小干扰稳定性,提升了伊犁、库车的外送能力。

The 750 kV Xinjiang Yili-Kuche power transmission and transformation project will form the Tianshan western section of a large ring network after completion and being put into operation in 2016. A calculation and analysis is made on the Xinjiang power grid before and after operation of the Yili-Kuche Line in terms of power flow distribution, safety and stability level, short-circuit current level and small disturbance stability. And the effects of the operation of Yili-Kuche line on the transmission capacity of key sections are studied. Calculation results show that the operation of Yili-Kuche line will realize inter-supply between north and south of Xinjiang power, and complementation between hydropower and photovoltaic power; lower the Isolated running risk of Yili region after tripping of Yili-Wusu line; improve the angle stability and small disturbance stability of Xinjiang power grid and upgrade the outbound power delivery capacity of Yili and Kuche region.