Analysis of Natural Half-Wave-Length Power Transmission Lines

Prabhakara, F.S.; Parthasarathy, K. R.; Rao, H. N. Ramachandra

doi:10.1109/tpas.1969.292294

Cited by 67 publications

(23 citation statements)

References 1 publication

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“…In both cases, the system will lose stability under the fault that occurs at the most serious fault point. Actually, the same conclusion will be obtained through similar derivation process when the losses of the transmission line are considered and the power equation is expressed as (13).…”

Section: Transient Synchronization Stability Analysismentioning

confidence: 65%

“…where: As shown in Figure 2, when the transmission distance is close to l resnt (in 2700-2715 km), there is no solution for (13), so the test system cannot operate; when the transmission distance is not in the above range, the test system can operate, but the absolute value of q g is too large. For example, when βl = 167 • , if p g = 0 p.u., 0.5 p.u., 1.0 p.u.…”

Section: Steady-state Overvoltage Analysismentioning

confidence: 99%

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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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Section: Transient Synchronization Stability Analysismentioning

confidence: 65%

Section: Steady-state Overvoltage Analysismentioning

confidence: 99%

Infeasibility Analysis of Half-Wavelength Transmission Systems

Yang

Sheng

2018

Energies

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“…This can largely reduce the electrical distance between both ends of the line [2,3]. Because of this, HWACT is suitable for long-distance and high-capacity transmission [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…As the length of the line reaches the half-wavelength, the power-voltage characteristic becomes different. Under the assumption that the line is lossless, the voltage amplitudes of both ends are equal and the phase angle difference is 180 degrees for the HWACT line [1][2][3]15]. This indicates that the terminal voltages are not related to the transmission power.…”

Section: Introductionmentioning

confidence: 99%

Penetrating power characteristics of half-wavelength AC transmission in point-to-grid system

Liang

Liu

Wan³

et al. 2018

J. Mod. Power Syst. Clean Energy

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With the concept of global energy interconnection being proposed, half-wavelength alternating current transmission (HWACT) technology becomes of more interest. HWACT lines can be adopted to establish a pointto-grid system, in which the penetrating power (PP) is produced between receiving terminals, having a significant effect on the power flow distribution. In order to investigate this phenomenon, the PP characteristics of the HWACT system are researched in this paper. First, the mathematical relationship between the transmission power and terminal bus voltages of a single HWACT line is derived using the equations of a distributed parameter model. The research indicates that the relationship between power and terminal voltages shows ''reverse characteristics'' opposite to those of regular short transmission lines. Then, the concept and definition of PP in a point-to-grid system with two receiving terminals are proposed, and the corresponding relationship between PP and the terminal bus voltages is derived. Simulations are carried out to validate the theory under different conditions, so that the accuracy and adaptiveness of the theoretical analysis can be proved. In addition, the results demonstrate that selecting the location for a HWACT system has demanding requirements in order to control the value of PP.

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“…Half-wavelength AC transmission (HWACT) technology refers to the ultra-long-distance three-phase AC transmission technology whose electrical distance is close to half-wavelength at the system power frequency, that is, the distance is about 3000 km [1][2][3]. Compared with the traditional UHV lines, UHV transmission lines with half-wavelength have significant economic and technological advantages, such as the entire line without the need to install any shunt reactors for reactive power compensation, the excellent voltage stability of both sending and receiving ends, no installation of switching stations across the line and so on.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Simulation of Fault Trip Criterion in Stability Control Device for Half-Wavelength Line

Zhang¹,

Li²,

Xu³

2017

dtetr

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Abstract. Half-wavelength AC transmission (HWACT) is an ultra-long distance AC transmission technology, whose electrical distance is close to half-wavelength at the system power frequency. Due to the excellent transmission capacity, stability control device must be installed in HWACT system. But the characteristics of the voltage and current of half -wavelength transmission line under fault condition are different from the characteristics of the ordinary short line. Its distributed-parameter characteristics are notable. So it is necessary to study the adaptability of the fault trip criterion for traditional lines to the HWACT lines. Simulation of the transmission line under fault condition was conducted in this paper based on the Bergeron model and adaptive analysis of fault trip criterion in stability control device for half-wavelength line was given. The results show that the fault trip criterion for traditional lines can't be well applied to half-wavelength line. New fault trip criterion needs to be proposed to keep the safe operation of half-wavelength transmission line.

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Analysis of Natural Half-Wave-Length Power Transmission Lines

Cited by 67 publications

References 1 publication

Infeasibility Analysis of Half-Wavelength Transmission Systems

Infeasibility Analysis of Half-Wavelength Transmission Systems

Penetrating power characteristics of half-wavelength AC transmission in point-to-grid system

Adaptive Simulation of Fault Trip Criterion in Stability Control Device for Half-Wavelength Line

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