The paper deals with the operation of very long EHV AC cable lines in a well-developed bulk power system, by simulating two 400 kV-50 Hz single circuit cable lines, 80-100 km long, installed at different locations of the Italian transmission network, both standing alone and in parallel to an existing overhead line. The power transmission limits of the considered cable lines are assessed analytically, as well as the required amount of shunt compensation and its location, at line terminals or also at mid-line: a criterion for sizing mid-line shunt compensation is also proposed. In order to check theoretical analyses carried out by analytical formulas, AC load flow simulations of the transmission network with the hypothetical cable lines in place are evaluated, referring to severe loading conditions in both normal and post-contingency operation. Open-ended cable operation and shunt compensation contingencies are also addressed. Results show that power transmission limits due to cable ampacity and higher active power flows due to low cable reactance do not pose special constraints on the operation of the powerful network under examination. Appropriate shunt compensation minimizes the effects of surplus cable reactive power, allowing to operate long 400 kV-50 Hz cable lines (up to 100 km at least) with reactors at line terminals only. Moreover, if shunt compensation is installed also at mid-line, operating capabilities of the long cable lines are enhanced and losses reduced. (C) 2011 Elsevier B.V. All rights reserved.

Steady-state operating conditions of very long EHVAC cable lines: Two case studies / Gatta, Fabio Massimo; Geri, Alberto; Lauria, Stefano; Maccioni, Marco. - In: ELECTRIC POWER SYSTEMS RESEARCH. - ISSN 0378-7796. - STAMPA. - 83:1(2012), pp. 160-169. [10.1016/j.epsr.2011.11.002]

Steady-state operating conditions of very long EHVAC cable lines: Two case studies

GATTA, Fabio Massimo;GERI, Alberto;LAURIA, Stefano;MACCIONI, Marco
2012

Abstract

The paper deals with the operation of very long EHV AC cable lines in a well-developed bulk power system, by simulating two 400 kV-50 Hz single circuit cable lines, 80-100 km long, installed at different locations of the Italian transmission network, both standing alone and in parallel to an existing overhead line. The power transmission limits of the considered cable lines are assessed analytically, as well as the required amount of shunt compensation and its location, at line terminals or also at mid-line: a criterion for sizing mid-line shunt compensation is also proposed. In order to check theoretical analyses carried out by analytical formulas, AC load flow simulations of the transmission network with the hypothetical cable lines in place are evaluated, referring to severe loading conditions in both normal and post-contingency operation. Open-ended cable operation and shunt compensation contingencies are also addressed. Results show that power transmission limits due to cable ampacity and higher active power flows due to low cable reactance do not pose special constraints on the operation of the powerful network under examination. Appropriate shunt compensation minimizes the effects of surplus cable reactive power, allowing to operate long 400 kV-50 Hz cable lines (up to 100 km at least) with reactors at line terminals only. Moreover, if shunt compensation is installed also at mid-line, operating capabilities of the long cable lines are enhanced and losses reduced. (C) 2011 Elsevier B.V. All rights reserved.
2012
cable ampacity; ehv cable line; shunt compensation; temporary overvoltages; transmission network
01 Pubblicazione su rivista::01a Articolo in rivista
Steady-state operating conditions of very long EHVAC cable lines: Two case studies / Gatta, Fabio Massimo; Geri, Alberto; Lauria, Stefano; Maccioni, Marco. - In: ELECTRIC POWER SYSTEMS RESEARCH. - ISSN 0378-7796. - STAMPA. - 83:1(2012), pp. 160-169. [10.1016/j.epsr.2011.11.002]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/428096
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