An Application of HVDC to the de-icing of Transmission Lines

Icicles are often formed under the downside surface of conductor in the wet growth icing of overhead power line. When the ice deposit around overhead power line is molten by Joule heat produced by current, the pattern of heat transfer of ice deposit with icicles is dissimilar to that without icicle, so the ice-melting model for the columnar icing conductor cannot be applied to icicle-shaped icing conductor. According to the heat-transfer characteristic of the icicle-shaped icing conductor, this paper puts forward a DC ice-melting model for the icicle-shaped icing conductor. Because this full model includes three-dimensional heat-transfer and interface movement, which cannot be solved in closed form, a finite element scheme in space-domain and a finite difference scheme in time-domain are employed to discretize the governing equations. Firstly the whole ice-melting process on the icicle-shaped icing conductor is simulated by this model. Then the simulated results are validated by ice-melting experiments in the artificial chamber. The study from the model and the experiments shows that the size and length of icicle as well as the space between the adjacent icicles are factors to affect ice-melting. With the shorter icicle space, the bigger icicle size and the longer icicle-length, the surface of ice layer is enlarged and then more heat is taken away by the convection and radiation, so the ice melting time will get longer. power line, icing, ice storm, ice melting, icicle Citation:Fan S H, Jiang X L, Shu L C, et al. DC ice-melting model for wet-growth icing conductor and its experimental investigation.

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“…(13). For the downsidesurface temperature of conductor, CC is 0.99 in Figure 15(a) and 0.995 in Figure 15(b).…”

Section: Temperature Curve and Its Investigationmentioning

confidence: 93%

“…It is discussed with an emphasis on resisting the icing-accidents of power grid in China after the ice storm of 2008 [5]. A large number of studies concerning ice-melting modeling may be found in the literatures since 1950s when the ice-storm has been regarded as a threat to the power grid [6][7][8][9][10][11][12][13]. Refs.…”

Section: Introductionmentioning

confidence: 99%

DC ice-melting model for wet-growth icing conductor and its experimental investigation

Fan

Jiang

Shu

et al. 2010

Sci. China Technol. Sci.

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“…Ice-covering is a great threat to power grid and deicing is the corresponding vitally important measure to ice-covering phenomenon [1][2][3] . Based on the research from SIEMENS in early 2008, ±500kV Gao-Zhao HVDC project, which starts from Gaopo town of Anshun city (AS) and terminates in Zhaoqing city (ZQ), will operate in back-to-back HVDC mode to melt ice covering around the DC transmission lines.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Gao-Zhao HVDC with Deicing Function and Its Operation Analysis Based on EMTDC

Xie

2011

2011 Asia-Pacific Power and Energy Engineering Conference

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The EMTDC model of ±500kV Gao-Zhao HVDC with DC power forth-and-reverse transmission deicing function is firstly introduced, including model parameters, user-defined SIMADYN D module development and HVDC control strategies, then bipole DC power forth-and-reverse transmission theory, deicing function realization and deicing function operation procedure are presented successively, and finally some deep researches and comprehensive analyses of Gao-Zhao HVDC deicing operation are excellently accomplished. Simulation results show that Gao-Zhao HVDC EMTDC model with deicing function performs well with excellent operation dynamic characteristic, reactive power consumption of Gaopo converter station by deicing operation mode is larger than that by normal operation mode, reactive power consumption of Zhaoqing converter station by deicing operation mode is smaller than that by normal operation mode, and AC voltage characteristic harmonic of deicing operation mode is smaller than that of normal operation mode in either Gaopo converter station or Zhaoqing converter station.

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“…Joule-Effect method is one of most important thermal deicing method applied around world which is including Load Shifting Method [8], Reduced-Voltage & Short-Circuit Method [9,10], DC Current [11,12], On-load Network De-icer [13], Contactor Load Transfer [14], Shunt Capacitor Compensating Reactive Current Method [15,16]. This paper has studied adjusting load de-icing method based on inductor and capacitor compensation [15] and shunt capacitor compensating reactive current [16].…”

Section: Introductionmentioning

confidence: 99%

De-icing Schemes and Operations for Overhead Power Line Based on Shunt Capacitor Over-compensation Method

Liu

Peng

Lehtonen

et al. 2010

2010 International Conference on Electrical and Control Engineering

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De-icing schemes and operations for overhead power line in 10kV, 66kV and 220kV networks based on shunt capacitor over-compensation method are proposed in this paper. This novel de-icing method is based on characteristics of sinusoidal AC and theory of shunt capacitor over-compensation. By utilizing 10kV capacitor bank, which is installed as standard apparatus in substation, reactive current can be transmitted to the specific deicing power line, which leads to over-compensation of network, and temperature of the power line will be increased. This de-icing scheme and operations are proved and verified in 10kV network by on-site experiments. Focus on characteristics and structure of power grid in China, this method is feasible to transferred and applied in 35kV, 66kV and 220kV networks.

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An Application of HVDC to the de-icing of Transmission Lines

Cited by 21 publications

References 1 publication

DC ice-melting model for wet-growth icing conductor and its experimental investigation

DC ice-melting model for wet-growth icing conductor and its experimental investigation

Modeling of Gao-Zhao HVDC with Deicing Function and Its Operation Analysis Based on EMTDC

De-icing Schemes and Operations for Overhead Power Line Based on Shunt Capacitor Over-compensation Method

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