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1
Content available Corona Modeling for the Transient Analysis, Steady State and Corona Loss Performance of Transmission Lines
Saied M. M.
Electrical Power Quality and Utilisation. Journal
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2013
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Vol. 16, iss. 2
11--20
EN
This paper addresses the steady state analysis and the electromagnetic transients of overhead power transmission lines exhibiting corona. After a brief survey of the currently available modeling techniques, an alternative approach to the simulation of the corona discharge is presented. It is based on adding voltage-dependent current sources at prespecified nodes within the line’s lumped, ladder-shaped, equivalent circuit including an aduqate number of sections. The characteristics of these current sources can be determined using the usually available corona power loss measurements under power frequency sinusoidal voltage conditions. The line model is used for finding its transient response using time domain techniques. Several voltage excitation waveforms and magnitudes as well as different line’s loading conditions are investigated. As a further application of the suggested approach, the minimizion of the total corona losses of a long shunt compensated line will be considered as an additional criterion in the process of identifying the appropriate rating and location of the compensating coil primarily used for improving the line’s voltage profile.
2
Content available remote Static Bifurcation Point and Maximum Loadability in a shunt compensated Multibus Power System
Naik S.D., Bhat S.S., Khedkar M.K.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 9a
38-41
EN
In heavily loaded systems, voltage stability limit is usually dominant and voltage instability is usually observed following large disturbance. This is typically the case in the deregulated environment as the transmission systems are operating under more stressed condition due to increased transaction level associated with open access. In this paper simple voltage stability analysis is carried out for a multibus power system (26 Bus System).The effect of shunt compensation on critical eigen value of Jacobian matrix, system loadabilty and static voltage stability is established.
PL
W systemie przeciążonym jednym z najważniejszych parametrów jest stabilność napięcia. W artykule przeprowadzono analizę stabilności napięcia w wieloszynowym systemie (26 szyn).
3
Content available The Impact of the Load Characteristics on the Assessment and Optimization of the Shunt Compensation of Distribution Feeders
Saied M. M.
Electrical Power Quality and Utilisation. Journal
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2009
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Vol. 15, iss. 1
9--14
EN
The paper gives the results of applying an alternative procedure for the economical as-sessment and optimization of the shunt compensation of radial power distribution feeders with con¬centrated and/or distributed loading, taking into account the feeder copper losses as well .is the installation cost of capacitors. In addition to the energy and capacitor specific costs, the objective function depends on the si/e and location of the capacitor, the feeder resistance, the voltage level, and the load current. The results <»f a detailed parameter study on the impact of the load parameters are presented. The study focuses primarily on the impact of the load factor, the load power factor as well as the feeder's loading profile.
4
Content available remote Przekształtnik matrycowy jako generator mocy biernej w sieci elektroenergetycznej
Rząsa J.
Zeszyty Naukowe Politechniki Rzeszowskiej. Elektrotechnika
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2007
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z. 30 [247]
59-69
PL
Artykuł składa się dwóch części. Opracowana na podstawie literatury część teoretyczna dotyczy kompensacji równoległej i jej roli w zapewnieniu stabilnej pracy systemu energetycznego. Część druga jest analizą możliwości zastosowania przekształtnika matrycowego jako generatora mocy biernej. Przedstawiono wyniki symulacji pracy układu przekształtnika matrycowego w konfiguracji ze zdwajaniem mocy biernej.
EN
The article consists of two parts. Worked out on the base of theoretical part deals with shunt compensation and stability of work of the ac transmission system. The second part analyse the possibility of implementation of the matrix converter as var generator. Results of work simulations of the matrix converter in power-doubling connection are presented.
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