Research On The Distribution Characteristics Of The Hybrid Ionized Field Of The Parallel Transmission Line With The Weather Condition

Our country is dominant in the construction of the Global Energy Internet,which brings a new high-speed development opportunity to the construction of Ultra-High Voltage(UHV)grid.With the rapid development of economy,the transmission corridor is becoming increasingly scarce,especially in economically developed areas.With less land available,the construction of AC/DC parallel lines are inevitable.Due to the coupling effect,the electric field on the wire surface of the AC/DC parallel lines changes and superimposing.The ionized field under the transmission line becomes complicated,forming the so-called hybrid ionized field.At present,hybrid ionized field still lack a more accurate calculation method and a wide range actual engineering test in different weather conditions.Therefore,in this article,an improvement meshless method has been proposed to calculate the hybrid ionized field of AC/DC parallel lines and the hybrid ionized field distribution features have been studied in different circuit structure and weather conditions.The main innovations in this paper are as follows:(1)aiming at the insufficiency of hybrid ionized field calculation method,a MLPG method based on the radial point interpolation polynomial item(RPIMp)has been proposed to calculate the electric field.The problem of local support domain and boundary overlap in solving Poisson equation is solved by the adaption narrow support of domain boundary.Then the validity of the calculation method is verified.(2)The influence of ac lines on ion flow field is analyzed.the model of AC/DC parallel line based on meshless method has been set up.The validity of the model algorithm is validated by the comparison of the measured data and the calculation data.The influence law of the AC/DC lines' height,DC lines' pole spacing,AC/DC lines' parallel spacing,and AC lines' voltage grade to hybrid ionized field are analyzed,which can provide advice for the AC/DC parallel line's engineering construction.(3)The distribution law of hybrid ionized field in different weather conditions are analyzed.hybrid ionized field in the AC/DC parallel lines are calculated when temperature,humidity,and haze changed.The results of actual engineering test data in different weather conditions were analyzed.The influence of temperature,humidity and haze on the hybrid ionized field of AC/DC parallel lines is obtained.