Results 261 to 270 of about 120,545 (279)

A stochastic based voltage collapse indicator

IEEE Transactions on Power Systems, 1993
The voltage collapse of a power system is analyzed as the result of the eventual push of the system operating point beyond the boundary of voltage security due to random fluctuations in the system load characteristics. The effect of different fluctuation intensity levels at load buses on the eventual voltage collapse of a power system is studied with ...
C.O. Nwankpa, R.M. Hassan
openaire   +1 more source

Time-domain simulation investigates voltage collapse

IEEE Computer Applications in Power, 1993
Fast and slow power system dynamic performance is illustrated with two examples from actual electric utility systems. These examples were chosen to characterize a local reactive power shortage and radial system performance, respectively. In both cases, a critical disturbance is examined.
R.J. Koessler, J.W. Feltes
openaire   +1 more source

An optimal strategy against voltage collapse

[1991] Proceedings of the 34th Midwest Symposium on Circuits and Systems, 2002
An optimal strategy is presented to offer a preliminary solution to the growing concern of voltage collapse. The optimal strategy will maximize the power transfer within a given system while minimizing the necessary amount of shunt reactive power (VAr) support before voltage collapse is encountered.
V. Ajjarapu, P.L. Lau
openaire   +1 more source

SVC behaviour under voltage collapse conditions

IEEE Transactions on Power Systems, 1992
Under stressed conditions, it may be necessary for a power system to operate at a point where a voltage-susceptance characteristic has a negative slope. The authors demonstrate that static VAR compensators (SVCs) can extend stable operation into that region.
I.A. Hiskens, C.B. McLean
openaire   +1 more source

Analysis of voltage collapse by simulation

IEEE International Symposium on Circuits and Systems, 2003
Voltage collapse was investigated by simulations on a midsize power system with 39 buses and 10 generators. System loads were modeled as constant complex power corrupted with Gaussian noise of a small magnitude. The initial conditions for simulation were determined by singular-value decomposition of the load-flow Jacobian.
M.M. Begovic, A.G. Phadke
openaire   +1 more source

Voltage collapse - experience and modelling

IEE Colloquium on Voltage Collapse, 1997
The problems found in the control of voltage will depend on the geography of the power system (relative location of power sources and demand, terrain), demand levels and the development stage reached, for instance, the type and amount of reactive power compensation.
openaire   +1 more source

Estimation of time to voltage collapse

2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC), 2016
Finding out remained time to voltage instability occurrence is necessary to make a timely decision on corrective actions. This paper presents a novel method for discovering time to long term voltage instability. The method is based on virtually acceleration of OLTCs' operation during time domain simulation in order to realizing detection of long ...
M. Khalilifar, M. Joorabian, S. Gh. Seifosadat, S. M. Shahrtash   +3 more
openaire   +1 more source

Discussion on some voltage collapse indices

Electric Power Systems Research, 2000
Abstract This paper discusses some voltage collapse indices with the help of bifurcation theory. Two main topics are presented: first, the identification of a well-behaved eigenvalue as a function of load increase; second a theoretical interpretation of the results. For this purpose, the center manifold theorem is employed.
openaire   +1 more source

Energy functions analysis in voltage collapse

European Transactions on Electrical Power, 2001
AbstractTime‐domain approach examines the behaviour of the system, one determines whether stability has been maintained or lost. In contrast to the time‐domain approach, direct methods determine system stability based on energy functions. The basis of direct methods for the stability assessment of a system is knowledge of the stability region.
F. Jurado, J. Carpio
openaire   +1 more source

Voltage collapse prediction with locally recurrent neural networks

IEEE Power Engineering Society Summer Meeting,, 2003
Voltage stability studies aim to evaluate the ability of a power system to keep acceptable value of voltages at all nodes either under normal or contingency conditions. Voltage instability involves generation, transmission, and distribution and includes a wide range of phenomena.
PILO, FABRIZIO GIULIO LUCA, Loddo, M., CELLI, GIANNI, Usai, M.   +3 more
openaire   +3 more sources