Research Status and Prospects of the Half-Wavelength Transmission Lines

Wang, Guan; Li, Qingmin; Zhang, Li

doi:10.1109/appeec.2010.5449450

Cited by 27 publications

(24 citation statements)

References 6 publications

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“…The transmission system used in the study is formed by three 500 kV existing lines in the Brazilian system that will be connected to form the AC-Link trunk [5]. They have similar structure and have several substations close one to another what will allow connecting them in series.…”

Section: Description Of the Analysed Systemmentioning

confidence: 99%

“…The maneuver will be the energization of an AC-link test composed of three interconnection trunks that have similar electrical characteristics, specifically the Brazilian interconnections North-South I (NS-1), North-South II (NS-2) and part of North East-South East (NE-SE) [5]. Together these transmission systems form a trunk of 2600 km, a little more than a halfwavelength, but as they were three similar but not identical lines some studies regarding the validity of the proposed test have to been performed to observe possible reflections at the lines connections and, beside that, some sensitivity analysis of how different these lines could be in other to still represent an AC-Link.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Energization Test of a Half-Wavelength AC Link Composed of Similar Transmission Lines

Gomes

Tavares

2011

2011 Asia-Pacific Power and Energy Engineering Conference

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This paper presents the analysis of the use of similar transmission lines to represent a trunk of a little more than a half wavelength (HWL+) in order to conduct an on-site energization test. Some results of the possible reflections that may occur at the interconnection of similar lines are analyzed and also it is established boundary conditions of different transmission lines that can still represent a HWL+ trunk in order to enable similar tests within different power grid. The validation of the AC-Link Test formed by different transmission lines is performed through the analysis of two-port elements constants in the frequency range of interest. Time domain simulations are also presented to the studied trunk.

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Section: Description Of the Analysed Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the Energization Test of a Half-Wavelength AC Link Composed of Similar Transmission Lines

Gomes

Tavares

2011

2011 Asia-Pacific Power and Energy Engineering Conference

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“…Voltage and current distribution of half-wavelength line is very different from the characteristic of short line [2][3][4][5][6]. The voltage and current of two terminals don't follow the Kirchhoff's law based on the lumped parameters no longer, the measured impedance are no longer monotonic with distance [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…The economy of half-wavelength transmission is better. According to preliminary estimates by Brazil, 1000 kV HWACT's transmission cost of per unit length and per unit power is 29.8% of 500 kV EHV's [6].…”

mentioning

confidence: 99%

Integrated protection based on multi-frequency domain information for UHV half-wavelength AC transmission line

Wang

et al. 2016

Prot Control Mod Power Syst

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Half-wavelength AC Transmission (HWACT) can improve capability of AC transmission significantly. According to the basic principle of HWACT, the electromagnetic transient model of HWACT is built to analyze the fault transient process of transmission line. Based on fault characteristics of HWACT, the adaptability of traditional protections for transmission lines is analyzed briefly, such as current differential protection, distance protection and over current protection. In order to solve the problems of conventional protection caused by HWACT, a novel integrated protection based on multi-frequency domain information is proposed in this paper, which uses both the power frequency information and transient information. The integrated protection based on multi-frequency domain information takes advantages of power frequency and transient protections, which can not only improve the performance of traditional protection of AC transmission line but also realize fast fault judgment by transient travelling wave protection.

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“…There is no need of compensating equipment and switching stations for the half-wavelength transmission line [7,8].…”

mentioning

confidence: 99%

Infeasibility Analysis of Half-Wavelength Transmission Systems

Yang

Sheng

2018

Energies

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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.

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Research Status and Prospects of the Half-Wavelength Transmission Lines

Cited by 27 publications

References 6 publications

Analysis of the Energization Test of a Half-Wavelength AC Link Composed of Similar Transmission Lines

Analysis of the Energization Test of a Half-Wavelength AC Link Composed of Similar Transmission Lines

Integrated protection based on multi-frequency domain information for UHV half-wavelength AC transmission line

Infeasibility Analysis of Half-Wavelength Transmission Systems

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