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http://dx.doi.org/10.5370/JEET.2015.10.3.1144

Resonant Frequency Estimation of Reradiation Interference at MF from Power Transmission Lines Based on Generalized Resonance Theory  

Bo, Tang (Dept. of Electric Engineering and Renewable Energy School, China Three Gorges University)
Bin, Chen (Dept. of Electric Engineering and Renewable Energy School, China Three Gorges University)
Zhibin, Zhao (Dept. of Electrical and Electronic Engineering School, North China Electric Power University)
Zheng, Xiao (China Electric Power Research Institute, State Grid Corporation of China)
Shuang, Wang (Dept. of Electric Engineering and Renewable Energy School, China Three Gorges University)
Publication Information
Journal of Electrical Engineering and Technology / v.10, no.3, 2015 , pp. 1144-1153 More about this Journal
Abstract
The resonant mechanism of reradiation interference (RRI) over 1.7MHz from power transmission lines cannot be obtained from IEEE standards, which are based on researches of field intensity. Hence, the resonance is ignored in National Standards of protecting distance between UHV power lines and radio stations in China, which would result in an excessive redundancy of protecting distance. Therefore, based on the generalized resonance theory, we proposed the idea of applying model-based parameter estimation (MBPE) to estimate the generalized resonance frequency of electrically large scattering objects. We also deduced equation expressions of the generalized resonance frequency and its quality factor Q in a lossy open electromagnetic system, i.e. an antenna-transmission line system in this paper. Taking the frequency band studied by IEEE and the frequency band over 1.7 MHz as object, we established three models of the RRI from transmission lines, namely the simplified line model, the tower line model considering cross arms and the line-surface mixed model. With the models, we calculated the scattering field of sampling points with equal intervals using method of moments, and then inferred expressions of Padé rational function. After calculating the zero-pole points of the Padé rational function, we eventually got the estimation of the RRI’s generalized resonant frequency. Our case studies indicate that the proposed estimation method is effective for predicting the generalized resonant frequency of RRI in medium frequency (MF, 0.3~3 MHz) band over 1.7 MHz, which expands the frequency band studied by IEEE.
Keywords
Reradiation interference from transmission lines; Resonant frequency; Generalized resonance theory; Model-based parameter estimation; Method of moments; Quality factor;
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