An efficient unified methodology for steady-state and dynamic security assessment of power systems

Popović, Dragan P.

doi:10.1016/0378-7796(89)90020-5

Cited by 9 publications

(17 citation statements)

References 15 publications

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“…Both for planning and operation purposes, the most important constraint to be respected in an Over Head Transmission Line (OHTL) is providing adequate clearances to the objects placed under the line, at all operating conditions; this is the primary aspect that limits the rating ("ampacity") of a line [2].…”

Section: Introductionmentioning

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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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: Introductionmentioning

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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“…Takođe, tercijarna regulacija se koristi i za otklanjanje zagušenja u prenosnoj mreži (redispečing). U analizama statičke sigurnosti, posledice analiziranih poremećaja utvrđuju se na bazi procene postdinamičkih kvazistacionarnih stanja, pomoću odgovarajućih modela tokova snaga, na primer [7,8]. Ovi modeli samo impliciraju dinamički prelazni proces, koji se neminovno javlja nakon poremećaja.…”

Section: Uvodunclassified

“…Njihova sposobnost za više ili manje tačnom procenom uspostavljenih postdinamičkih kvazistacionarnih stanja zavisi od same vrste modela tokova snaga (konvencionalni ili nekonvencionalni) i od načina odgovarajućeg inkorporiranja efekata postojeće sistemske automatike, regulacije i zaštite. U prilazu Instituta "Nikola Tesla" analizama statičke sigurnosti [8], proračunavaju se tokovi snaga u karakterističnim postdinamičkim kvazistacionarnim stanjima. U pitanju su nekonvencionalni modeli tokova snaga, koji obuhvataju stanja nastala nakon dejstva primarne regulacije napona i učesta-nosti, stanja nastala nakon dejstva sekundarne regulacije učestanosti i snage razmene i stanja nastala nakon preduzetih dispečerskih akcija (tercijarna regulacija), ako su one bile neophodne.…”

Section: Uvodunclassified

Primary, secondary and tertiary frequency control in dynamic security analyses of electric power interconnections

Ivanović¹,

Popović²,

Minić³

2012

Zb EI Nikola Tesla

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Kratak sadržaj: U radu je izložen način na koji su primarna, sekundarna i tercijarna regulacije učestanosti inkorporirane u analize dinamičke sigurnosti elektroenergetskih interkonekcija, saglasno realnom stanju EES Srbije, u njegovom širokom okruženju. Snaga razmene se neposredno i automatski reguliše u okviru sekundarne regulacije, a posredno, u okviru primarne i tercijarne regulacije učestanosti. Testiranje unapređenog softvera za analize dinamičke sigurnosti obavljeno je, i dalje se obavlja, na formiranom regionalnom modelu mreže, koji uključuje EES: Srbije,

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“…All over the world, increasing the thermal rating of existing overhead transmission lines is considered a valid alternative to the construction of new lines [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…

Abstract

Keywords

Ampacity, Dynamic Thermal Rating, Overhead lines

IntroductionAll over the world, increasing the thermal rating of existing overhead transmission lines is considered a valid alternative to the construction of new lines [1,2].The thermal rating of a transmission line is the highest current that the line can carry under assigned meteorological conditions, respecting all clearances. The ampacity is limited in practice by the maximum allowed operating temperature: if the temperature limit is exceeded, the distances between conductors and ground decrease to unacceptable values.

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mentioning

confidence: 99%

A Novel Thermo-Mechanical Model to Assess the Dynamic Thermal Rating of Multi-Span Overhead Transmission Lines

Pelacchi¹,

Poli²

2015

Period. Polytech. Elec. Eng. Comp. Sci.

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Keywords Ampacity, Dynamic Thermal Rating, Overhead lines IntroductionAll over the world, increasing the thermal rating of existing overhead transmission lines is considered a valid alternative to the construction of new lines [1,2].The thermal rating of a transmission line is the highest current that the line can carry under assigned meteorological conditions, respecting all clearances. The ampacity is limited in practice by the maximum allowed operating temperature: if the temperature limit is exceeded, the distances between conductors and ground decrease to unacceptable values. Assessing the dynamic ampacity of a conductor is then strictly related to the precise calculation of its sag [3,4].In this context, Dynamic Thermal Rating (DTR) of transmission lines represents a significant improvement with respect to the traditional steady-state rating criteria, which usually result in standard seasonal ampacities. In fact the thermal time constant of conductors is relatively high (more than 10 minutes) [3]; this fact allows exploiting the dynamic performances of conductors, i.e. currents significantly higher than the steady-state thermal limits, during transient overloads, thus avoiding re-dispatching or the curtailment of Renewable Energy Sources [5].The margin of dynamic overloading of a power line can be evaluated focusing on the temperature of the conductor; such a temperature can be either evaluated using a thermal model, having as an input weather conditions and power flows [6,7], or operating a direct measure on the conductor [8].The analysis of the literature clearly shows that, no matter which method is used to assess the conductor temperature, the dynamic mechanical behaviour of multi-span power lines has been so far investigated under the hypothesis that the horizontal mechanical tension along the line is uniform; this means neglecting the contribution given to the tensions, span by span, by the insulators' strings rotation. This conventional technique is referred to as method of the "equivalent span", or "ruling span technique" [9][10][11]. Furthermore, this traditional method strictly assumes one uniform conductor temperature over the entire power line, thus neglecting the fact that different spans basically share the same current, but not always the same weather conditions (solar radiation, wind speed). Finally, this method

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An efficient unified methodology for steady-state and dynamic security assessment of power systems

Cited by 9 publications

References 15 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

Primary, secondary and tertiary frequency control in dynamic security analyses of electric power interconnections

A Novel Thermo-Mechanical Model to Assess the Dynamic Thermal Rating of Multi-Span Overhead Transmission Lines

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