环天山西段大环网投运初期对新疆电网运行风险分析

Analysis on Running Risk of Xinjiang Power Grid during Initial Operation Stage of Tianshan Western Section of Large Ring Network

随着750kV伊犁—库车输变电工程建成投运,届时将形成环天山西段大环网,环网线路长度合计约1 800km。环天山西段大环网的建成,打通了南北疆电力互供的通道,形成南北疆互供格局,提升伊犁地区、南疆五地州清洁能源消纳能力。但是由于环天山西段大环网中两变电站之间均通过单回750kV线路联系,环网中任一回750kV线路故障将导致大规模、大范围潮流转移,严重影响电网安全稳定运行。同时750kV伊库线穿越高海拔地区,气候条件恶劣,运行环境复杂,进一步恶化了电网可靠运行,致使外界对构建环天山西段大环网的作用产生了疑惑。因此从供电可靠性、送电能力、安全稳定性、清洁能源消纳能力等方面对环天山西段大环网投运初期进行分析,详细对比分析环天山西段大环网投运后对新疆电网运行带来的好处以及投运后对新疆电网运行产生的风险,消除外界对构建环天山西段大环网疑虑,同时为指导环天山西段大环网安全稳定运行提供了重要技术支撑。

With 750 kV Yili - Kuche power transmission and transformation project being put into operation, it will form a large ring network in Western Tianshan, and the total line length of ring network is about 1 800 km. The large ring network in Western Tianshan gets through the channel of power supply form southern to northern Xinjiang, realizes the inter - supply be-tween southern and northern Xinjiang, and improves the accommodation capacity of clean energy in Yili region and the five southern states. But because the two substations in Tianshan western section of large ring network are connected with each oth-er through a single 750 kV line, the fault of either 750 kV lines in the ring network will lead to a large scale and wide range flow transfer, which seriously affects the safe and stable operation of power grid. At the same time, 750 kV Yili - Kuche line passes through the areas with high altitude and harsh climatic conditions, the complex environment deteriorates even further the reliable operation of power grid, which makes the outside world doubt on the construction of Tianshan western section of large ring network. The reliability of power supply, power transmission capacity, safety and stability, accommodation capacity of clean energy and other aspects during initial operation stage of Tianshan western section of large ring network are analyzed, the benefits brought by the operation of Tianshan western section of large ring network are compared in detail as well as the risks after its operation, which can eliminate the doubts for the construction of a ring network and provide an important technical support for the safe and stable operation of Tianshan western section of large ring network.