考虑功率衰减的输电线路高频激励融冰法研究

Transmission line deicing based on high frequency excitation considering power attenuation

输电线路高频融冰技术是新型融冰技术发展方向之一,在实际应用研究中融冰功率沿线衰减问题还未得到研究。基于均匀传输线理论,阐述了输电线路高频激励融冰法理论模型,并分析了覆冰输电线路等效电路结构,简要介绍了高频激励融冰法的融冰方式;根据Makkonen模型,在离线短路融冰方式和考虑融冰功率衰减下给出了融冰激励源最佳融冰频率和工作电压的确定方法。通过数值模拟得到了三峡—万县500 k V鄂西段输电线路考虑功率衰减和不衰减下融冰热功率的沿线分布情况及功率均匀密度,以及考虑衰减下融冰热功率和激励源输出电压的关系。分析表明,在考虑功率衰减下提高融冰激励源输出电压能有效使合成热达到融冰所需热功率,可以为该融冰方法应用到实际工程中提供理论参考。

The high.frequency melting technology for transmission lines is one of the development directions of the new melting technologies.In the practical applications,the problem of the attenuation along the melting ice power has not been studied yet.Based on transmission theory,the theoretical model of high frequency excitation deicing of the transmission lines is described.Also,the equivalent circuit of the transmission lines is presented and the melting mode of this method is introduced.In the context of offline ice melting mode and considering the power attenuation,the methods to determine the excitation source optimal melting frequency and voltage is given according to the Makkonen model.And thermal power along the distribution and power uniform density considering the power attenuation and non-attenuation is presented by numerical simulation with Three Gorges-Wanxian 500 kV transmission line in western Hubei.Meanwhile,the relationship between the melting ice thermal power and the excitation source output voltage has been obtained.Numerical results show that improving the ice melting excitation source output voltage can effectively achieve the required cooling power of icing on considering the power decay,and it can be referenced for the application of ice melting method in practical engineering.