输电线路附加融冰电源的最佳频率及电压确定方法  

Optimal frequency and voltage determination method of de-icing power source for transmission lines

作　　者：胡涛[1] 汤赐[1] 蔡杰 李昭良 陈立君 HU Tao;TANG Ci;CAI Jie;LI Zhaoliang;CHEN Lijun(School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410114

出　　处：《电力科学与技术学报》2020年第3期155-161,共7页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(51307009);湖南省自然科学基金(2017JJ2265);湖南省教育厅科学研究项目(14C0022)。

摘　　要：在传输线路中增设溶冰装置能有效提高电力系统安全稳定性。在此背景下,首先基于均匀传输线理论,建立覆冰输电线路的等效电路和等效分布参数电路模型,给出输电线路附加融冰电源的最佳频率、电压确定方法;并以110 kV电压等级的输电线路为例,提供几个特定介质损耗角下最佳频率、电压的组合。最后借助MATLAB/Simulink仿真软件,分析频率、电压对沿线热功率、热功率均匀度、功率因数等的影响。研究结果表明,附加融冰电源的频率、电压对其融冰效果起到了决定性的作用;采用所提出的最佳频率、电压确定方法,不仅可以实现覆冰导线可靠、高效的融冰效果,而且还能降低电源对所需电力电子器件在开关频率、耐压等级等方面的要求。Based on the theory of uniform transmission line,an equivalent circuit model and an equivalent distribution-parameter circuit model are established respectively for studying the de-icing process of transmission lines.The determinizing method for the optimal frequency and voltage of the de-icing power supply is then given.A transmission line with the rated voltage of 110 kV is adopted as an example.Combinations of frequency and voltage are obtained at several dielectric loss angles.Finally,the effects from the frequency and voltage on the thermal power and power factor along the transmission line are analyzed by utilizing MATLAB/Simulink.The research results show that both frequency and voltage of the de-icing power supply play a decisive role in de-icing process of transmission lines.The proposed method can not only realize reliable and efficient de-icing effects for ice-covered lines,but also reduce the requirements of the de-icing power supply on its power electronics selection in terms of switching frequency and withstand voltage level.

关 键 词：交流融冰 高频激励融冰 介质损耗 集肤效应 

分 类 号：TM752[电气工程—电力系统及自动化]