DOI:10.35833/MPCE.2018.000470 |
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Voltage Characteristic Analysis of Ultra-high Voltage Half-wavelength Transmission System Based on Wave Process Method |
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Page view: 117
Net amount: 599 |
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Author:
Hao Tian1,Yutian Liu1,Dong Yang2,Xiaohui Qin3,Yantao Zhang3
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Author Affiliation:
1.Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education, Shandong University, Jinan, China;2.State Grid Shandong Electric Power Research Institute, Jinan, China;3.China Electric Power Research Institute, Beijing, China
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Foundation: |
This work was supported by the State Grid Corporation of China (No. SGSDDK00KJJS1600149). |
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Abstract: |
The voltage characteristics of a half-wavelength transmission (HWLT) system lack mechanism explanation and systematic summary. In this paper, both the steady-state and fault voltage characteristics are analyzed and explained based on the wave process method. An analysis model is established for HWLT lines and wave propagation equations with different terminal conditions are deduced. For steady-state conditions, voltage profiles along HWLT lines are depicted and partial overvoltage occurs when there is an overload or low-power factor. In addition, fault voltage characteristics are analyzed under load-rejection or short-circuit conditions. The series resonance overvoltage will happen when short-circuit faults occur at certain positions and its peak value is influenced by grid strength or fault type. Furthermore, a refined transmission line model is presented to consider non-ideal factors and simulation results demonstrate that geomorphic conditions and electromagnetic environments influence line voltage characteristics to a certain extent. |
Keywords: |
Half-wavelength transmission ; wave process method ; steady-state voltage ; fault voltage ; non-ideal factor |
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Received:July 07, 2018
Online Time:2020/03/02 |
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