计及线路气象随机性的电网电热协调潮流模型  

Power Flow Model Considering Electro-thermal Coupling under Random Weather Conditions on the Line

作　　者：祖玮 应展烽[1] 徐冰 刘天明 ZU Wei;YING Zhan-feng;XU Bing;LIU Tian-ming(School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;NARI Group Corporation,Nanjing 211000,China)

机构地区：[1]南京理工大学能源与动力工程学院,南京210094 [2]南京南瑞集团公司,南京211000

出　　处：《科学技术与工程》2021年第5期1849-1856,共8页Science Technology and Engineering

基　　金：国家自然科学基金(51607091);国家重点实验室开放基金(SGNR0000GZJS1705881)。

摘　　要：电热协调(electro-thermal coordination,ETC)潮流模型能够同时获得电网潮流和线路温度的计算结果,可为电网运行分析和决策制订提供有力支撑。然而,现有ETC潮流模型忽略了线路气象变化的随机性,无法描述线路气象对电网潮流和线路温度的随机影响。为此,提出了一种计及线路气象随机性的ETC潮流模型。该模型首先利用马尔科夫链方法对线路气象进行随机模拟,再以此对导线热平衡方程和潮流方程开展耦合求解,最后得到潮流分布和线路温度变化的统计规律。算例结果表明,所提ETC模型能够反映线路气象随机性对电网潮流和线路温度的影响,同时有效获取电网运行时的线路过热风险,提高了电网运行的安全性,为进一步开展电网调度理论研究铺设基础。Electro-thermal coordination(ETC)power flow model can obtain the calculation results of power flow and line temperature at the same time,which can provide a strong support for power network operation analysis and decision-making.However,the current ETC power flow model ignores the randomness of weather conditions on the overhead line and cannot describe the random influence of weather conditions on power flow and line temperature.Therefore,an ETC power flow model which taken into account the meteorological randomness of the line was proposed.Firstly,the Markov Chain method was employed to randomly simulate these weather conditions in the model.Secondly,the coupling solving of the heat balance equation and the power flow equation was carried out.Finally,the statistical law of the power flow distribution and changes of the line temperature were obtained.A case study shows that the ETC model can reflect the influence of meteorological randomness on power flow and line temperature.Meanwhile,the model can effectively obtain the risk of line overheating during power network operation,thus improve the operation security of system.The results lay the foundation for theoretical research of electric power system operation dispatching.

关 键 词：电热耦合 随机气象 马尔科夫链 输电导线 潮流模型 

分 类 号：TM743[电气工程—电力系统及自动化]