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Review of Under-voltage Load Shedding Schemes in Power System Operation

100%

Verayiah R. , Mohamed A. , Shareef H. , Zainal Abidin I.

2014

tom R. 90, nr 7

99--103

A voltage collapse event is complex and localized in nature, but its effect is extensive. A vital effect of voltage collapse is total system collapse or blackouts, which will result in a significant loss to utility companies. Online monitoring of power system stability has thus become an important factor for electric power utilities. The final resort prevent the occurrence of a voltage collapse incident is the implementation of an undervoltage load shedding (UVLS) scheme. This paper focuses on the introduction of the UVLS scheme and presents an overview of the principles of the UVLS that are crucial to the design of such a protection scheme. This paper also presents the existing industrial practices and other research methods available to date.

W artykule opisano algorytm UVLS (Under Voltage Shedding Schemes) zastosowany do monitorowania stabilności systemu energetycznego I zapobiegania jego zapaściom. Artykuł jest przeglądem metod stosowanych w praktyce oraz prac badawczych w tej dziedzinie.

O współzależności między mocą bierną a stabilnością napięcia zasilania w przypadku okresowych niesinusoidalnych przebiegów napięcia i prądu

63%

Siwczyński M.

Przegląd Elektrotechniczny

2011

tom R. 87, nr 6

169-173

W artykule podano nieznany dotąd związek miedzy mocą bierną a stabilnością napięcia zasilania w przypadku występowania okresowych niesinusoidalnych sygnałów napięcia i prądu.

In the article the unknown up to now relationship between the reactive power and stability of voltage of source were given. The nonsinusoidal situation is considered.

Comparative analysis of multi-criteria decision making methods for the assessment of optimal SVC location

51%

Aydin F. , Gümüş B.

2022

tom Vol. 70, nr 2

art. no. e140555

The goal of multi-criteria decision making (MCDM) is to select the most appropriate of the alternatives by evaluating many conflicting criteria together. MCDM methods are widely available in the literature and have been used in various energy problems. The key problems studied in electrical power systems in recent years have included voltage instability and voltage collapse. Different flexible alternating current transmission systems (FACTS) equipment has been used for this purpose for decades, increasing voltage stability while enhancing system efficiency, reliability and quality of supply, and offering environmental benefits. Finding the best locations for these devices in terms of voltage stability in actual electrical networks poses a serious problem. Many criteria should be considered when determining the most suitable location for the controller. The aim of this paper is to provide a comparative analysis of MCDM techniques to be used for optimal location of a static VAR compensator (SVC) device in terms of voltage stability. The ideal location can be determined by means of sorting according to priority criteria. The proposed approach was carried out using the Power System Analysis Toolbox (PSAT) in MATLAB in the IEEE 14-bus test system. Using ten different MCDM methods, the most appropriate locations were compared among themselves and a single ranking list was obtained, integrated with the Borda count method, which is a data fusion technique. The application results showed that the methods used are consistent among themselves. It was revealed that the integrated model was an appropriate method that could be used for optimal location selection, providing reliable and satisfactory results to power system planners.