Thermo-Mechanical Model of Multi-Span Overhead Transmission Lines Equipped with High-Temperature Low-Sag Conductors

Pelacchi, Paolo; Poli, Davide

doi:10.15866/iremos.v8i3.5918

Cited by 8 publications

(10 citation statements)

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“…(4) determines the steady-state temperature  std ;  the thermal time constant  The CIGRE document reports calculation methods for  and τ, taking into account thermo-fluid dynamic considerations; the calculation, based on the equilibrium between heat entering in the conductor and heat dispersed to the environment, is iterative, since  itself depends on the steady-state conductor temperature. In previous papers of the same authors [19] [20], new thermal models have been proposed and discussed also for High Temperature Low Sag conductors [21] [22].…”

Section: Heating Curve and Margin Of Overloadingmentioning

confidence: 99%

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A Sensitivity Analysis of Dynamic Thermal Rating Procedures Using a Probabilistic Monte Carlo Approach

Pelacchi¹,

Davide²

2016

Engineering and Industry

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The Dynamic Thermal Rating (DTR) algorithm proposed in this paper combines the CIGRE thermal model of conductors with a complex multi-span mechanical model of the line that takes into account the mechanical interaction between spans, due to the possible rotation of strings, and that the temperature of conductors can vary span by span, for different weather conditions. The developed tool is able to forecast the time trend of conductor temperatures, tensions, sags and clearances at each span. Since the weak point of DTR algorithms is the proper forecast of weather conditions about to be present on the different spans of the line, this paper investigates the possibility of using a probabilistic approach to assess the robustness of the thermal and mechanical outputs of the DTR procedure. A sensitivity analysis of results is carried out considering many different weather scenarios, properly drawn and weighted by a Monte Carlo technique. A case study based on a 400-kV overhead transmission line is shown and discussed.

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Section: Heating Curve and Margin Of Overloadingmentioning

confidence: 99%

“…In previous papers of the same authors, the described thermo-mechanical model was applied to compare the steady state and the dynamic performance of conductors [23] [24], or to estimate the calculation errors induced by the simplified "ruling span" technique [19] [20].…”

Section: Case Studymentioning

confidence: 99%

A Sensitivity Analysis of Dynamic Thermal Rating Procedures Using a Probabilistic Monte Carlo Approach

Pelacchi¹,

Davide²

2016

Engineering and Industry

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“…In order to address both targets, Ensiel (in particular the University of Pisa) has developed in the last years a novel thermo-mechanical model of a multi-span transmission line, by combining the CIGRE thermal model of conductors [9] and an innovative description of mechanical interactions existing among all the spans placed between two dead-end towers of the line [11] [12]. The main features of the weather-based DTR tool developed within the OSMOSE project, already described and discussed in [22], can be summarized as follows:…”

Section: Weather-based Dtr Methodsmentioning

confidence: 99%

“…The tool has been widely validated in previous works and compared with the state-of-the-art procedures [11] [12][21] [26]. This model has been implemented on two 150-kV sub-transmission lines located in Southern Italy.…”

Section: Weather-based Dtr Methodsmentioning

confidence: 99%

“…This model has been implemented on two 150-kV sub-transmission lines located in Southern Italy. The following structural data have been gathered to be enclosed into the weather-based DTR model: position and height above sea level of all towers; features of insulator chains; electrical, geometrical, thermal and mechanical characteristics of ACSR conductors; Every Day Stress of the line; maximum temperature and sag allowed at each span [12]. The section monitored in one of the lines, equipped with standard ACSR conductors with a diameter of 31.5 mm, is composed by 20 spans placed between two dead-end towers.…”

Section: Weather-based Dtr Methodsmentioning

confidence: 99%

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Weather-Based Dynamic Thermal Rating in WP5 of H2020 Osmose Project: implementation and preliminary results

Poli

Fioriti

Lazzaro

et al. 2021

2021 AEIT International Annual Conference (AEIT)

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As already well known, Terna leads the Working Package 5 of The Italian demo of the H2020 Osmose project, which stands for Optimal System-Mix Of flexibility Solutions for European electricity. The main purpose of OSMOSE is developing a novel Energy Management System (EMS), which allows managing distributed Renewable Energy Sources (RES) and grid congestions, by properly coordinating innovative flexibility resources which include Dynamic Thermal Rating (DTR) and Demand Side Response (DSR). In this innovative approach, one of the two DTR investigated methods, which have been both developed by Ensiel, a consortium of Italian universities active in power systems research, is the Weather Based DTR. This technique is based on a thermo-mechanical model of the monitored line and on a detailed weather forecast of the involved area, having as final output the loadability curve of the line. The main features of the Weather Based DTR solution are described in this paper, and the first experimental results obtained on real case studies are presented and discussed in order to prove their effectiveness.

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Indirect weather‐based approaches for increasing power transfer capabilities of electrical transmission networks

Keyvani

Whelan

Doddy

et al. 2023

WIREs Energy & Environment

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Dynamic line rating (DLR) systems are recognized as a cost-effective and socially accepted asset for relieving network congestion and uprating existing transmission systems, based upon accessing additional weather-dependent capacity of overhead lines. Although direct and indirect DLR methods are available, utilization of indirect weather-based approaches, that is, sensors are not installed on the conductor, are of increasing interest due to fast installation times, that is, no requirement for line outages and lower capital costs, with achievable potential for wide-area implementation. An extensive review is presented on the components and requirements of such systems, including weather stations, forecasting models, downscaling and DLR calculations, overhead line and conductor thermal models, and communication platforms. In addition, the features of practical instances of these systems are briefly reviewed. Moreover, a systematic approach is introduced for statistical evaluation of the high-level DLR potential across an entire region, as well as an assessment of the line-level DLR ampacities within an electrical grid, based on (weather forecasting) reanalysis data. The proposed methodology can disclose available additional capacity as part of early-stage planning for wide-area DLR systems. The island of Ireland and the 110 kV network of the Republic of Ireland (ROI) power system are considered as the study cases, with comparison made against seasonal static ratings and ambient temperature adjusted line rating methods.

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Thermo-Mechanical Model of Multi-Span Overhead Transmission Lines Equipped with High-Temperature Low-Sag Conductors

Cited by 8 publications

References 0 publications

A Sensitivity Analysis of Dynamic Thermal Rating Procedures Using a Probabilistic Monte Carlo Approach

A Sensitivity Analysis of Dynamic Thermal Rating Procedures Using a Probabilistic Monte Carlo Approach

Weather-Based Dynamic Thermal Rating in WP5 of H2020 Osmose Project: implementation and preliminary results

Indirect weather‐based approaches for increasing power transfer capabilities of electrical transmission networks

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