Real-Time Overhead Transmission-Line Monitoring for Dynamic Rating

Douglass, D.A.; Chisholm, William A.; Davidson, Glenn A.; Grant, I. S.; Lindsey, Keith E.; Lancaster, M.; Lawry, D.C.; McCarthy, Tom; Nascimento, Carlos Do; Pasha, Mohammad; Reding, J.L.; Seppa, T.O.; Toth, Janos; Waltz, Peter

doi:10.1109/tpwrd.2014.2383915

Cited by 118 publications

(68 citation statements)

References 2 publications

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“…The heat balance equation and the power flow are two subprograms. When the conductor temperatures of Equation (2) are calculated, Equation (2) receives the carrying currents calculated by Equation (9). When the carrying currents of Equation (9) are calculated, Equation (9) receives the conductor temperatures calculated by Equation (2).…”

Section: Grid Power Flow Involving Conductor Temperature Variationmentioning

confidence: 99%

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Impact of Conductor Temperature Time–Space Variation on the Power System Operational State

et al. 2018

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Abstract:The conductor temperature of an overhead transmission line varies with time and space, which has an important impact on the system operation. In this paper, the conductor temperature is solved iteratively by the CIGRE heat balance equation. The time-space variation of conductor temperature of a 220-kV transmission line is analyzed using real meteorological data from Weihai. Considering the temporal distribution characteristics, the seasonal model of the conductor temperature is given. Considering the spatial distribution, the mean value model, the weight average model, and the segmentation model are established. The system power flow involving the conductor temperature is established based on the relationship between conductor temperature and transmission line parameters. Through the calculation of power flow and the analysis of the maximum power transmission capability, the accuracy of the segmentation model is verified. The results show that the conductor temperature of overhead lines has obvious time-space variation characteristics. It is necessary to consider the time-space variation when analyzing the operation state of power systems.

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Section: Grid Power Flow Involving Conductor Temperature Variationmentioning

confidence: 99%

“…It is necessary to observe the conductor temperature in real-time. The conductor temperature of the overhead transmission line can be obtained directly by measuring devices on the spot [7][8][9]. In the United Kingdom, the transmission network with the maximum voltage rating of 400 kV and the…”

Section: Introductionmentioning

confidence: 99%

Impact of Conductor Temperature Time–Space Variation on the Power System Operational State

et al. 2018

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“…In order to reduce both congestion and face these challenges, different techniques [1] can be used depending on the characteristics of the line. Among these solutions is monitoring the line state allowing the assessment of thermal limits and the application of DRL [2], as long as the ampacity is limited by the sag of the catenary. As the forerunner of DLR, OHL's ampacity by probabilistic methods was introduced using seasonal atmospheric conditions [3].…”

Section: Introductionmentioning

confidence: 99%

Conductor Temperature Estimation and Prediction at Thermal Transient State in Dynamic Line Rating Application

Álvarez

Silva

Mombello

et al. 2018

IEEE Trans. Power Delivery

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The traditional methodology for defining the ampacity of overhead lines is based on conservative criteria regarding the operating conditions of the line, leading to the so-called static line rating. Although this procedure has been considered satisfactory for decades, it is nowadays sensible to account for more realistic line operating conditions when calculating its dynamic ampacity. Dynamic line rating is a technology used to improve the ampacity of overhead transmission lines based on the assumption that ampacity is not a static value but a function of weather and line's operating conditions. In order to apply this technology, it is necessary to monitor and predict the temperature of the conductor over time by direct or indirect measurements. This paper presents an algorithm to estimate and predict the temperature in overhead line conductors using an Extended Kalman Filter, with the aim of minimizing the mean square error in the current and subsequent states (temperature) of the conductor. The proposed algorithm assumes both actual weather and current intensity flowing along the conductor as control variables. The temperature of the conductor, mechanical tension and sag of the catenary are used as measurements because the common practice is to measure these values with dynamic line rating hardware. The algorithm has been validated by both simulations and measurements. The results of this study conclude that it is possible to implement the algorithm into Dynamic Line Rating systems, leading to a more accurate estimation and prediction of temperature.

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“…In [12] an optimal real time transmission congestion management algorithm is proposed considering not static and fix thermal rates, but quasi-dynamic thermal rates of transmission lines. In [13] the wide range of real-time line monitoring devices which can be used to determine the DTR of an overhead transmission line in normal or contingency operation is discussed. In [14], considering the growth in RES installation, DTR is investigated as a way to connect the new intermittent generation, expanding the possibility to increase the rating of non-thermally limited lines (long lines).…”

Section: Introductionmentioning

confidence: 99%

Methodologies for the Exploitation of Existing Energy Corridors. GIS Analysis and DTR Applications

et al. 2018

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Abstract:The exploitation of power lines currently in operation has now become a common practice among electric system operators. The construction of new power lines requires taking economic, political and social problems into consideration. This paper considers two methodologies adopted by the Italian Transmission System Operator (TSO), Terna S.p.A.: Dynamic Thermal Rating (DTR) and Laser Imaging Detection and Ranging-Geographic Information System (L-GIS). DTR systems dynamically calculate the real transport capacity of a power line. The L-GIS system allows, after the geo-referencing of the power line, the management of any interference between the line and the nearby obstacles, permitting the optimization of the high voltage line operation. In this paper, after a brief illustration of the two methods, the authors report the results of some applications in the Sicilian electrical power High Voltage (HV) system.

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Real-Time Overhead Transmission-Line Monitoring for Dynamic Rating

Cited by 118 publications

References 2 publications

Impact of Conductor Temperature Time–Space Variation on the Power System Operational State

Impact of Conductor Temperature Time–Space Variation on the Power System Operational State

Conductor Temperature Estimation and Prediction at Thermal Transient State in Dynamic Line Rating Application

Methodologies for the Exploitation of Existing Energy Corridors. GIS Analysis and DTR Applications

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