《Zhongguo Dianji Gongcheng Xuebao/proceedings of the Chinese Society of Electrical Engineering》
Study on the eletric-field inverse problem in the environmental evaluation of HV transmission lines
作者:
F Yang，HE Wei，FU Yong-Chang，XC Luo，WB Zhang
关键词:
transmission line ； electric field ； inverse problem ； global regularization ； damped Newton method
摘要:
In order to avoid a large number of measurements in the environmental evaluation of the HV transmission lines,the inverse problem equation of the power-frequency electric field of the HV transmission line was reformulated in this paper.Global regularization was used to process the ill-posed characteristic of inverse problem solution caused by the interference.Damped Gauss-Newton method was used to search the optimum solution,and then the actual field source parameters of transmission lines could be obtained.A 500 kV double-circuit transmission line was taken as an example to verify the computation.The results show that the global regularization technology can effectively eliminate the ill-conditioning characteristic of the inverse problem.According to the real parameters of transmission lines obtained from the solution to the inverse problem,the actual distribution of the electric field in the vicinity of transmission lines can be calculated.Therefore,in the environmental evaluation,the electric field strength at part of the measuring points under transmission lines can be measured firstly.Then through the computation of the inverse problem,the surrounding electric-field distribution can be calculated,so that part of the measurements can be replaced and the measurement workload can be reduced.
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