DocumentCode :
2274061
Title :
A novel index for online voltage stability assessment based on correlation characteristic of voltage profiles
Author :
Aghamohammadi, M.R. ; Hashemi, S. ; Ghazizadeh, M.S.
Author_Institution :
Dept. of Electr. Eng., Power & Water Univ. of Technol., Tehran, Iran
fYear :
2010
fDate :
27-29 Oct. 2010
Firstpage :
165
Lastpage :
170
Abstract :
Voltage instability is a major threat for security of power systems. Preserving voltage security margin at a certain limit is a vital requirement for today´s power systems. Assessment of voltage security margin is a challenging task demanding sophisticated indices. In this paper, a new index based on the correlation characteristic of network voltage profile is proposed for the purpose of online voltage security assessment. Voltage profile comprising all bus voltages contains the effect of network structure, load-generation patterns and reactive power compensation on the system behaviour and voltage security margin. Therefore, the proposed index is capable to clearly reveal the effect of system characteristics and events on the voltage security margin. The most considerable feature of this index is its fast and easy calculation from synchronously measured voltage profile without any need to system modelling and simulation and without any dependency on network size. At any instant of system operation by merely measuring network voltage profile and no further simulation calculation this index could be evaluated with respect to a specific reference profile. The results show that the behaviour of this index with respect to the change in system security is independent of the selected reference profile. The simplicity and easy calculation make this index very suitable for online application. The proposed approach has been demonstrated on IEEE 39 bus test system with promising results showing its effectiveness and applicability.
Keywords :
compensation; correlation methods; power system security; power system stability; IEEE 39 bus test system; correlation characteristic; load-generation pattern; network structure; online voltage stability assessment; power system security; reactive power compensation; voltage profile; Correlation; Load pattern; Pattern recognition; Voltage profile; Voltage security margin;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
IPEC, 2010 Conference Proceedings
Conference_Location :
Singapore
ISSN :
1947-1262
Print_ISBN :
978-1-4244-7399-1
Type :
conf
DOI :
10.1109/IPECON.2010.5697099
Filename :
5697099
Link To Document :
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