连续高温天气下架空线路动态载流能力评估与运行温度安全告警

Dynamic Ampacity Evaluation and Operating Temperature Safety Warning of Overhead Lines under Continuous High Temperature Weather Conditions

摘要: 近年来重庆地区多次出现夏季连续极端高温天气，空调电负荷大，而高温天气下线路载流能力下降，因此需要关注架空线路的运行安全问题。本文提出以动态载流量和运行温度共同表征架空线路的安全裕度，结合运行气象环境在线辨识架空线路的实时运行温度和动态载流能力，当载流裕度不足或导线温升越限时，向电网调度人员发出安全告警。此外，在预想的供电断面N−1潮流转移后，预测导线温升响应时间，提醒电网调度人员在此时限以内及时采取负荷转供措施。最后，以重庆地区某供电断面为算例，验证了所提方法的有效性和准确性。评估结果可以在确保安全的前提下，充分利用线路动态载流能力，为连续高温天气下的电网运行调度提供指导。

Abstract: In recent years, Chongqing has undergone a series of extreme continuous high temperature weather in summer. The power load of air conditioning increases largely, while the ampacity of overhead lines decreases under extreme high temperature. Therefore, it is important to focus on the operation safety of overhead lines. In this paper, the safety margin of overhead lines is char-acterized by dynamic heat rating and operating temperature, and the real time operating temper-ature and dynamic thermal rating of overhead lines is estimated using operational meteorological environment parameters. And it can send dispatchers a safety alarm when the ampacity margin is not enough or the conductor temperature rise is off-limit. Furthermore, the temperature rise re-sponse time of the conductor is predicted after the preconceived N−1 power flow transferred, to remind power dispatchers to take load transfer measures within this time limit. Finally, the validity of proposed method is verified through a case analysis which considering a power flow section in Chongqing region. And the result of reliability evaluation which takes full advantage of the dynamic heat rating of the line under the premise of ensuring safety can provide reference for operation and dispatching in continuous high temperature weather conditions.