EHV and UHV Line Loadbility Dependence on Var Supply Vapability

Kay, Tony; Sauer, Peter W.; Shultz, Richard D.; Smith, R. A.

doi:10.1109/tpas.1982.317584

Cited by 25 publications

(1 citation statement)

References 6 publications

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“…The incidence of reactive power reserves in OHLs loadability is outlined and investigated in [9] where, however, attention focuses only on the aspect of the angle stability limit and the analysis is carried out for lossless lines. Reference [10] demonstrates the large advantage that can be obtained through a controlled compensation for medium and quite long lines, which fall in the voltage drop region of the loadability curves. The work in [11] examines the power capacity increase in long OHLs that can be obtained through passive compensators consisting of series capacitors and shunt reactors located at one or both line ends, whereas [12] analyzes the loadability curves of radial OHLs compensated by means of synchronous condensers connected at the receiving end.…”

Section: Introductionmentioning

confidence: 98%

Analytical Description of Overhead Transmission Lines Loadability

2019

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The loadability characteristics of overhead transmission lines (OHLs) is certainly not a new topic. However, driven by sustainability issues, the increasing need to exploit existing electrical infrastructures as much as possible, has given OHL loadability a renowned central role and, recently, new investigations on this subject have been carried out. OHL loadability is generally investigated by means of numerical methods. Even though this approach allows deducing useful information in both planning and operation stage, it does not permit to capture all the insights obtainable by an analytical approach. The goal of this paper is to tailor a general analytical formulation for the loadability of OHLs. The first part of the paper is devoted to the base-case of uncompensated OHLs. Later, aiming to demonstrate the inherent feasibility and flexibility of the novel approach proposed, the less frequent case of shunt compensated radial OHLs is investigated as well. The analytical formulation is combined with the use of circular diagrams. Such diagrams allow a geometrical interpretation of the analytical relationships and are very useful to catch the physical insights of the problem. Finally, in order to show the applicability of the new analytical approach, a practical example is provided. The example concerns calculation of the loadability characteristics of typical 400 kV single-circuit OHLs.

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Section: Introductionmentioning

confidence: 98%

Analytical Description of Overhead Transmission Lines Loadability

2019

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Critical analysis of line loadability constraints

Quaia

2018

Int Trans Electr Energ Syst

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This paper develops a critical analysis of the constraints that influence the loadability curves of overhead transmission lines. The constraints considered are conductor thermal limit, allowed voltage drop (or voltage quality limit), steady-state (or angle) stability margin, voltage stability margin, and Joule losses limit. The analysis points out the different meanings and/or bearing of the various limits. In addition, the paper outlines a general comparison of voltage and angle stability and discusses the possible role of Joule losses, which are usually not included in line loadability analysis. The paper also discusses how line loadability is affected by the replacement of standard aluminium conductor steel reinforced conductors with high-temperature low-sag conductors and by reactive compensation with shunt reactors and series capacitors.

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A linear programming method for series and shunt compensation of HV transmission lines

El-Metwally

El-Emary

EL-Azab

2005

Euro. Trans. Electr. Power

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SUMMARYThe power transfer capability (PTC) of AC transmission lines is increased by using series capacitor and shunt reactor compensation. This paper presents a method to calculate the degree of series capacitor and shunt reactor compensation in order to increase the power transfer capability of overhead transmission lines. This method is based on linear programming which takes into consideration line modelling, series and shunt compensation, voltage and reactive power constraints, and power factor before and after compensation. The proposed method has been applied to the existing 500 kV transmission line interconnected between the High-Dam generation station and Cairo load center in Egypt.

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EHV and UHV Line Loadbility Dependence on Var Supply Vapability

Cited by 25 publications

References 6 publications

Analytical Description of Overhead Transmission Lines Loadability

Analytical Description of Overhead Transmission Lines Loadability

Critical analysis of line loadability constraints

A linear programming method for series and shunt compensation of HV transmission lines

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