Application of a combined electro‐thermal overhead line model in power flow and time‐domain power system simulations

Kubis, Andreas; Rehtanz, Christian

doi:10.1049/iet-gtd.2016.1626

Cited by 20 publications

(14 citation statements)

References 25 publications

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“…Furthermore, the variable temperature of the conductors in the line spans brings about variations of the conductor length in spans. This in turn causes changes in the total reactance of the line [30,40], which in some circumstances can be neglected [32,39]. In such a case, the error part of Equation ( 5) assumes the form where the measurement function depends both on the vector of state variables x and on the vector of model parameters p. In a typical State Estimation (SE), the vector of the model parameters p remains constant:…”

Section: The Concept Of the Two-step Methods For Power System State And Line Temperature Estimationmentioning

confidence: 99%

“…Errors of both the measured values and of the model affect the estimation quality defined by the value of ε. The State Estimation (SE) uses a static model of the power system, where line resistance values are calculated on the basis of line length and conductor per-length resistances provided by the manufacturer, usually given for the temperature of 20 • C. Differences between actual parameters of an operating power line and parameters of a static power system model as a rule pertain to resistance and reactance values and are related to temperature changes in the conductors [16,[27][28][29][30][31][32]. Those temperature variations result from the heating effect produced by the current flow and the cooling influence of weather conditions [3,4,38,39].…”

Section: Power System State Estimationmentioning

confidence: 99%

“…The length of all lines had been estimated on the basis of specific resistance for 795 kcmil 26/7 Drake ACSR conductor connected as two-bundle, resulting line resistance 0.03585 Ω/km at temperature T re f = 20 • C. For specific weather conditions used for calculation of conductor temperatures in summer and winter case, the author refers to data presented in Appendix A and in Table A1. The power flow calculations using Electro-Thermal Overhead Line (ET-OHL) model have been performed as in [32]. Next, from the power flow results, the values of active and reactive powers along with bus voltages (P, Q,V) have been used for the power system state and line temperature estimation method.…”

Section: Test System Simulation and State With The Line Temperatures Estimationmentioning

confidence: 99%

“…There are many modifications of SE procedure that improve performance [21], the accuracy of results [22] or robustness to the power system model parameter errors [23][24][25][26]. One of the many sources of model parameter errors are the actual OTLs' operation temperatures [16,[27][28][29][30][31][32]. In [16], the authors proposed a two-stage estimation, where at the second stage OTL resistances are updated according to available measurements and actual weather parameters.…”

Section: Introductionmentioning

confidence: 99%

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Performance and Accuracy Investigation of the Two-Step Algorithm for Power System State and Line Temperature Estimation

Wydra

2018

Energies

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Data concerning actual temperatures of line conductors constitutes essential information for the power system operator. The temperature of the power lines can be used to improve the accuracy of the power system model, thereby increasing the accuracy of the state estimation. This article presents a two-step algorithm for the power system state and line temperature estimation. In its second stage, the proposed method searches for a line temperatures vector, which corrects the uncertain power system base model and allows for further minimization of an objective function. As a result, a more accurate estimation is obtained along with a more precise model of the estimated system. The derived model can then be used for more accurate optimization. The presented method enhances standard procedures of power system state estimation, and its advantage is that it does not require direct measurements performed by phasor measurement units or measurements of line conductor temperatures and weather conditions realized by dynamic line rating systems. The results of simulations made on various test models have been examined, confirming the convergence of the procedure to the point at which the average temperature of the line wires together with the voltage values and phase angles are achieved. The algorithm's performance and improvement method have also been presented. An advantage of the investigated approach is the possibility to calculate the temperature of line wires with the use of primary measurements in the power system. The presented and examined method, however, is sensitive to the measuring device errors. Additionally, an analysis of the method's errors and ways of reducing them has been performed.

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Section: The Concept Of the Two-step Methods For Power System State And Line Temperature Estimationmentioning

confidence: 99%

Section: Power System State Estimationmentioning

confidence: 99%

Section: Test System Simulation and State With The Line Temperatures Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance and Accuracy Investigation of the Two-Step Algorithm for Power System State and Line Temperature Estimation

Wydra

2018

Energies

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“…For a network with m nodes, the load vectors can be expressed as a function of the voltage vectors according to Equation (6): (6) where coresponds to the virtual slack node. Subsequently, for the power flow solution, we remove the first five rows of Equation 6that correspond to the virtual slack node and Equation 7is obtained.…”

Section: C) Power Flow Equationsmentioning

confidence: 99%

A Three-Phase Weather-Dependent Power Flow Approach for 4-Wire Multi-Grounded Unbalanced Microgrids with Bare Overhead Conductors

Pompodakis¹

2020

Preprint

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<p><b>Conventional power flow (CPF) algorithms assume that the network resistances and reactances remain constant regardless of the weather and loading conditions. Although the impact of the weather in power flow analysis has been recently investigated via the weather-dependent power flow (WDPF) approaches, the magnetic effects in the core of ACSR conductors have not been explicitly considered. ACSR conductors are widely used in distribution networks. Therefore, this manuscript proposes a three-phase weather-dependent power flow algorithm for 4-wire multi-grounded unbalanced microgrids (MGs), which takes into consideration the impact of weather as well as the magnetic effects in the core of ACSR conductors. It is shown that the magnetic effects in the core can significantly influence the power flow results, especially for networks composed of single-layer ACSR conductors. Furthermore, the proposed algorithm explicitly considers the multi-grounded neutral conductor, thus it can precisely simulate unbalanced low voltage (LV) and medium voltage (MV) networks. In addition, the proposed approach is generic and can be applied in both grid-connected and islanded networks. Simulations conducted in a 25-Bus unbalanced LV microgrid highlight the accuracy and benefit of the proposed approach. </b></p>

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Non-steady state electro-thermally coupled weather-dependent power flow technique for a geographically-traversed overhead-line capacity improvement

Talpur

Lie

Zamora

2019

Electric Power Systems Research

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Application of a combined electro‐thermal overhead line model in power flow and time‐domain power system simulations

Cited by 20 publications

References 25 publications

Performance and Accuracy Investigation of the Two-Step Algorithm for Power System State and Line Temperature Estimation

Performance and Accuracy Investigation of the Two-Step Algorithm for Power System State and Line Temperature Estimation

A Three-Phase Weather-Dependent Power Flow Approach for 4-Wire Multi-Grounded Unbalanced Microgrids with Bare Overhead Conductors

Non-steady state electro-thermally coupled weather-dependent power flow technique for a geographically-traversed overhead-line capacity improvement

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