Layout Design And Location Error Analysis Of Lightning Detection Network In Yunnan

Lightning is a common type of catastrophic weather.It causes a lot of losses every year.The losses caused by tripping of transmission lines in the power sector are even greater.In order to provide scientific data for real-time identification of power tripping accidents,a three-dimensional lightning detection network must be established.However,in the actual deployment process,how to select an address to accurately locate the lightning activity on the transmission line corridor is a key issue that people are concerned about.In view of the above problems,according to the location of the substation along the transmission line,a number of substations were selected to conduct the lightning detection station construction and observation of the network.At the same time,in order to evaluate the lightning strike tripping rate,the lightning intensity needs to be provided in real time.This paper establishes a reasonable inversion model,which provides support for the future discharge parameter estimation of the system.The main research methods and conclusions of this article are as follows:(1)First,a simplified calculation model of ground flashback electromagnetism field is proposed.In this paper,two concepts of curvature attenuation factor and conductivity attenuation factor are proposed innovatively.The final attenuation electromagnetic field is obtained by convolution operation of two attenuation factors in an ideal field.Compared with the traditional method,the calculation process is greatly simplified.Using the finite-difference time-domain algorithm to test the simplified algorithm,it is found that the simplified algorithm has high accuracy in calculating the attenuated electric field,and the relative error does not exceed 7%within a range of 1500 km.When the accuracy of the calculation result is not high enough,this can be used algorithm.The simplified algorithm is not suitable for the calculation of long-distance magnetic field,and the relative error is over 15%when the distance exceeds 1000 km.However,within a range of 800 km,a certain degree of calculation accuracy can be guaranteed.Then,using the magnetic field observation data to verify and analyze the simplified algorithm,it is found that the error of the comparison between the magnetic field observation data and the simplified algorithm is acceptable within 600 km,further illustrating the accuracy and applicable range of the simplified algorithm.(2)Secondly,using the lightning location algorithm to scientifically select the location of the detection station to achieve the maximum optimization effect.This paper conducts simulation research on lightning detection network station shape,baseline length,location of lightning,main station transformation and elevation difference between main station and deputy station.The results show that:detection network star station can ensure that there is no blind area in the detection area.It can achieve a high accuracy of positioning results for the entire region.Rectangular,diamond-shaped network have blind area,but can meet the focus area of high-precision positioning;the longer the baseline length,the greater the area of high-precision positioning area;the main station should be in the center position,the height should be higher than the secondary station;the higher the lightning trigger height,the better the positioning effect obtained.(3)Finally,the lightning location algorithm is combined with engineering practice.This paper selects two examples of station deployment to optimize the site selection of the station,introduces the considerations in the process of station selection,and combines the simulation calculation with the actual data to obtain the best positioning effect.In the process of site selection for the three-dimensional lightning detection station in Kunming,8 survey stations were selected from 11 survey stations.Positioning algorithms were used to fully evaluate the positioning results,and the precise positioning of transmission lines in the region was achieved.The detection results of lightning detection network in Yunnan Power Grid are different from the results of satellite data and weather analysis.In this paper,localization algorithms are used to analyze the sources of errors,and a station optimization scheme is proposed to make the positioning results more accurate.