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Energies 2018, 11(7), 1790; https://doi.org/10.3390/en11071790

Infeasibility Analysis of Half-Wavelength Transmission Systems

College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
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Received: 29 May 2018 / Revised: 18 June 2018 / Accepted: 4 July 2018 / Published: 8 July 2018
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

This paper analyzes the infeasibility of half-wavelength transmission systems in the aspects of power-frequency overvoltage and synchronization stability. The circuit model of the long-distance transmission system is established at first for steady-state and transient analysis. The sending-end system and the receiving-end system are both considered in the model. A test system based on an actual transmission line is given to facilitate the description of system characteristics. Based on the circuit model, the resonant transmission distance of the system is found and calculated. Theoretical analysis and numerical calculations are carried out to determine the feasibility transmission distance. It is demonstrated that the transmission distance should be in a certain range, which is larger than the resonant transmission distance, to satisfy the steady-state overvoltage and the small signal synchronization stability as well as the frequency deviation constraints. For transmission distances in the feasible range, the three-phase short circuit fault at a certain point of the transmission line will cause the most serious transient power-frequency overvoltage, and the system is very likely to lose synchronization stability. Considering the transient power-frequency overvoltage and the transient synchronization stability, the half-wavelength transmission system is technically impossible to operate. View Full-Text
Keywords: power transmission; half-wavelength transmission; resonant transmission distance; power-frequency overvoltage; synchronization stability; frequency deviation; equal area method power transmission; half-wavelength transmission; resonant transmission distance; power-frequency overvoltage; synchronization stability; frequency deviation; equal area method
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Xu, Z.; Yang, J.; Sheng, N. Infeasibility Analysis of Half-Wavelength Transmission Systems. Energies 2018, 11, 1790.

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