Results 251 to 260 of about 1,096,224 (293)

Time to voltage collapse dependence of load shedding to avoid voltage collapse

2017 IEEE Electrical Power and Energy Conference (EPEC), 2017
Power transmission systems of today are operating closer to their limits due to economic and environmental constrains. As a consequence, many systems around the world experience voltage collapse leading to partial or complete blackouts. Load shedding is a cost effective solution for preventing system collapse.
Tara Alzahawi, Mohindar S. Sachdev, G. Ramakrishna   +2 more
openaire   +1 more source

THE CAPABILITY OF ALTERNATORS IN VOLTAGE COLLAPSE ANALYSIS

Electric Machines & Power Systems, 1997
ABSTRACT The paper presents and discusses the static models of the synchronous machines used in voltage collapse analysis, taking into account the capability limits.The paper considers the thermal limits of rotor and stator currents (dependent on voltage and real power), the underexcitation limiters action that prevents from the stator-end heating ...
BERIZZI, ALBERTO, R. MARCONATO, SILVESTRI, ANDREA, ZANINELLI, DARIO   +3 more
openaire   +2 more sources

Loss of voltage controllability as a cause of voltage collapse

Proceedings of the 27th IEEE Conference on Decision and Control, 2003
Voltage stability and controllability definitions are proposed that can be applied at any time instant along the transient stability model trajectory or at the equilibrium point. Voltage controllability is defined at PQ buses. Conditions on sensitivity matrices that guarantee voltage controllability are then developed.
R.A. Schlueter, M.W. Chang, A. Costi
openaire   +1 more source

Indicating and mitigating voltage collapse comparing voltage stability indicators

2012 3rd IEEE PES Innovative Smart Grid Technologies Europe (ISGT Europe), 2012
Novel measures to indicate and mitigate voltage collapse in the power system are presented in this paper. The functionality of conventional and unconventional indicators and mitigating actions are tested in a case study using the IEEE Reliability Test System 1996.
Vegar Storvann, Emil Hillberg, Kjetil Uhlen   +2 more
openaire   +1 more source

Tools for Voltage Collapse Assessment

MELECON 2006 - 2006 IEEE Mediterranean Electrotechnical Conference, 2006
A variety of tools and techniques used for voltage stability analysis in power systems are discussed in this paper, with particular emphasis on their application to electricity markets. Thus, the computation of transfer capability limits, which are directly associated with the security constraints used in energy auction systems, by means of ...
C.A. Canizares, S.K.M. Kodsi
openaire   +1 more source

Voltage collapse scenario search

Proceedings. International Conference on Power System Technology, 2003
A cascading failure involves seemingly unexpected loss of many critical components such as transmission lines and generators. A cascading failure often leads to separation of the system into islands and results in the loss of a substantial amount of load.
Y. Koyama, T. Sasaki, S. Ihara, E.R. Pratico   +3 more
openaire   +1 more source

Indicators for Voltage Collapse Margins

2010 Asia-Pacific Power and Energy Engineering Conference, 2010
This paper introduces several different indices in order to characterize the voltage stability of a power system. Voltage instability is a phenomenon which often contributes to the development of power system disturbances. Therefore, is very important to know how a power system is close to voltage collapse.
Claudia Reis, F. P. Maciel Barbosa
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

Voltage collapse: case studies

Power Quality '98, 2002
This paper presents an analytical approach for the identification of optimal locations and sizes of reactive power compensation required to improve power system voltage stability. The paper also describes reactive compensation planning necessary to avoid a power system collapse similar to that which occurred in Australia's Hydro-Electric Corporation ...
M. Negnevitsky, R.L. Le, M. Piekutowsky
openaire   +1 more source

On the evaluation of voltage collapse criteria

IEEE Transactions on Power Systems, 1990
The authors provide an approach that enables a power system operator or planner to evaluate his or her alternatives in selecting a certain voltage collapse criterion. Specifically, the selection of a criterion must guarantee that the risk of making a wrong decision is minimal for any operating point and disturbance.
J.-C. Chow, R. Fischl, H. Yan
openaire   +1 more source