DocumentCode :
2291361
Title :
A voltage sag-based procedure for determining transient stability models of conventional loads
Author :
Rylander, M. ; Grady, W.M. ; Arapostathis, Ari ; Powers, Edward
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA
fYear :
2005
fDate :
27-27 July 2005
Firstpage :
321
Lastpage :
324
Abstract :
Conventional linear load models for stability studies use an exponential relationship to represent active and reactive power consumed as a function of voltage. Typical composite loads are modeled as constant power, current, impedance, or a combination of the three. There is a need for better procedures to produce more exact composite load models for use in stability studies. This paper discusses a method for extracting composite load characteristics using disturbances created by transmission voltage sags. Voltage sags, which are particularly frequent during thunderstorms, present the opportunity to refine stability load models for power systems. Fault and pre-fault power flow data are decomposed into active and reactive components, and are then further examined to extract the nonlinear load component. With the nonlinear loads removed from the data, the voltage variation of the remaining linear load active and reactive powers can be observed and the best stability models determined. The entire procedure is illustrated using actual data for a distribution feeder in Austin, TX, and the results match well with commonly cited references.
Keywords :
load (electric); power supply quality; power system transient stability; power transmission faults; reactive power; Austin Texas; composite load characteristics; conventional loads; distribution feeder; fault power flow data; pre-fault power flow data; stability load models; thunderstorms; transient stability models; transmission voltage sags; voltage sag; Data mining; Impedance; Load modeling; Power quality; Power system faults; Power system modeling; Power system stability; Power system transients; Reactive power; Voltage fluctuations;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electric Ship Technologies Symposium, 2005 IEEE
Conference_Location :
Philadelphia, PA
Print_ISBN :
0-7803-9259-0
Type :
conf
DOI :
10.1109/ESTS.2005.1524695
Filename :
1524695
Link To Document :
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