Study on the steady-state reactive power compensation of half-wavelength transmission lines considering the influences of the equivalent power supply impedance

Qin, Lü; Li, Long; Li, Canbing; Wang, Ansi; Zhang, Di

doi:10.1109/iciea.2017.8282960

Cited by 1 publication

(3 citation statements)

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“…where N is the integer. When θ > 0, there is A u > 0; thus, equations (13) and (14) are the minimum and maximum conditions of f u (μ x ), respectively. Meanwhile, since A i � − A u < 0, they are the maximum and minimum conditions of f i (μ x ), respectively.…”

Section: Equivalent Transmission Model For Current Transmissionmentioning

confidence: 99%

“…When discussing the influence of line length (L) on voltage transmission, the pole condition of f u (μ x ) as the denominator of U * M is aimed to be found out. erefore, equations (13) and 14are the maximum and minimum conditions, respectively. e following is the concrete analysis approach.…”

Section: Equivalent Transmission Model For Current Transmissionmentioning

confidence: 99%

“…Besides, HWTLs have strong transmission capacity and excellent voltage stability. erefore, many relative research studies have been carried out by several countries including China and Russia [12,13]. For example, in order to deliver large hydropower to load centers, Brazil has operated detailed research and simulation calculation on half-wavelength transmission technology [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Study on the Power-Frequency Waves Distribution Characteristics for Half-Wavelength Transmission Lines Based on the Frequency-Length Factor

Chang

Hong-geng

et al. 2020

Mathematical Problems in Engineering

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To analyze the distribution characteristics of voltage and current along half-wavelength transmission lines (HWTLs) in the cases with or without short circuit in the steady state, the method based on the frequency-length factor (FLF) for lossy lines is proposed. Firstly, according to the pole condition of the FLF, the distribution characteristics of power-frequency waves along HWTLs are analyzed. Then, the comprehensive effects of the system parameters and fault resistance are explored, revealing the mechanism of the power-frequency resonance caused by nonmetallic short circuit. Meanwhile, unbalanced short-circuit fault is studied by exploiting additional impedance. The results show that the distribution of the maximum value of power-frequency resonance voltage is related to the system parameters but not to the fault impedance. When a HWTL is short circuited at 2640 km∼2930 km, the resonance voltage can reach to 21 p.u. In relation to symmetrical short circuit, the resonance voltage appears at 1469 km from the short-circuit point, while the position moves towards the short-circuit point with the increase of additional impedance in asymmetrical short-circuit conditions. Additionally, the model theoretically proves that the power-frequency overvoltage induced by short circuit does not appear on a line whose length is less than 1469 km. Finally, cases are studied on PSCAD to verify the accuracy of the model.

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Section: Equivalent Transmission Model For Current Transmissionmentioning

confidence: 99%

Section: Equivalent Transmission Model For Current Transmissionmentioning

confidence: 99%