安稳风险动态约束下综合能源支撑的输电线路融冰优化策略

Optimization strategy for ice melting of transmission lines supported by comprehensive energy under the dynamic constraints of stability risk

针对现有的电网输电线路融冰方案决策过程耗时长、存在运行安稳风险而导致电网应对严重冰灾决策能力不足的问题,文章提出了安稳风险动态约束下综合能源支撑的输电线路融冰优化策略。首先,根据气象数据建立覆冰增长模型,分析输电线路覆冰增长与线路故障的对应关系,建立线路停运概率模型,并量化线路停运的损失程度;其次,分析基于综合能源改变线路潮流以减缓线路覆冰增长机理,并考虑综合能源配电线路融冰风险约束,建立基于综合能源的线路融冰模型,在此基础上,提出了安稳风险动态约束下综合能源支撑的输电线路融冰优化方法,基于拉格朗日松弛方法进行迭代求解。采用IEEE RTS-79进行融冰算例仿真,研究结果表明,基于该策略可以提高输电线路融冰方案决策效率,并保证电网的安全稳定运行。

Aiming at the problem that the decision-making process in the existing power grid transmission line ice melting scheme arrangement takes a long time,and there is a risk of operation stability,which leads to the insufficient decision-making ability of the power grid to deal with severe ice disasters,a comprehensive energy-supported transmission line ice melting optimization strategy under the dynamic constraints of stability risk is proposed.Firstly,an icing growth model is established based on meteorological data,the corresponding relationship between transmission line icing growth and line faults is analyzed,a line outage probability model is established,and the loss degree of line outage is quantified.Secondly,the mechanism of changing the line flow based on integrated energy to slow down the growth of line icing is analyzed,and the ice-melting risk constraints of distribution lines based on integrated energy are considered to establish a line ice-melting model based on integrated energy.On this basis,an ice-melting optimization method for transmission lines with integrated energy support under the dynamic constraints of stability risk is proposed,which is iteratively solved based on the Lagrangian relaxation method.IEEE RTS-79 is used to simulate the ice melting example.The results show that the method based on this paper can improve the efficiency of the transmission line ice melting scheme arrangement and ensure the safe and stable operation of the power grid.