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Example of undervoltage load shedding implementation
AFRICON 2007, 2007After deregulation of power systems, large problems with voltage stability incurred due to the large transits of power transmitted to large distances. Systems are very stressed and often work on their limits. Therefore, single contingency is sometimes enough to cause system collapsing.
Klarić, Mario +2 more
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An energy based approach to undervoltage load shedding
Electric Power Systems Research, 1995Abstract A novel effort to apply Lyapunov's energy methods towards developing an energy based load shedding scheme in order to alleviate voltage instability is presented. An ‘absolute’ energy function is derived which eliminates the need to calculate the unstable equilibrium points (UEPs) and thus saves a considerable amount of computation time.
Anoop Nanda, Mariesa L. Crow
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Undervoltage load shedding using global voltage collapse index
IEEE PES Power Systems Conference and Exposition, 2004., 2005Increasingly higher demand in power created problems in power system operation since the growth of the transmission system is restricted. System often function close to their stability limits and sometimes loads need to be shed in order to prevent system from collapsing.
Klarić, Mario +2 more
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An Efficient Method for Undervoltage Load Shedding
2009 Asia-Pacific Power and Energy Engineering Conference, 2009This paper analyses the Thevenin equivalent characteristics of voltage instability by the P-V curve at the load buses. The situation and the time for load shedding are determined by identifying the weakest bus in the network by means of a voltage instability proximity index (VIPI). The index is defined by estimating Thevenin equivalent parameters using
Jin Liu, Zhiyang Liu, Laifu Li
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Undervoltage load shedding to avoid voltage instability
IEE Proceedings - Generation, Transmission and Distribution, 1998The paper presents a technique for undervoltage load shedding (UVLS) in power systems. The undervoltage load shedding criterion has been developed using a dynamic load model. The parameters of the dynamic load model are estimated online using a nonlinear least squares technique, namely the Gauss-Newton method.
R. Balanathan +3 more
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Simulation of undervoltage load shedding to prevent voltage collapse
2005 IEEE Russia Power Tech, 2005Recent blackouts in USA, Italy and London discovered problems with systems in operation near to their limits. After deregulation of power systems in industrialized countries, large problems with voltage stability incurred due to the larger and larger amounts of power transmitted to larger and larger distances.
Klarić, Mario +2 more
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2007 60th Annual Conference for Protective Relay Engineers, 2007
This paper discusses why voltage as well as frequency load shedding may be necessary to prevent major system blackouts. Investigations of recent blackouts indicate that the root cause of almost all of these major power system disturbances is voltage collapse rather than the underfrequency conditions prevalent in the blackouts of the 1960 and '70s. This
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This paper discusses why voltage as well as frequency load shedding may be necessary to prevent major system blackouts. Investigations of recent blackouts indicate that the root cause of almost all of these major power system disturbances is voltage collapse rather than the underfrequency conditions prevalent in the blackouts of the 1960 and '70s. This
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A strategy for undervoltage load shedding in power systems
POWERCON '98. 1998 International Conference on Power System Technology. Proceedings (Cat. No.98EX151), 2002This paper presents a strategy for undervoltage load shedding in power systems. An undervoltage load shedding (UVLS) criterion is defined using a generic dynamic load model to determine the amount of load to shed at a given voltage. The 'when and where' for load shedding is determined by identifying the weakest node in the network using a voltage ...
R. Balanathan +2 more
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Optimal undervoltage load shedding using Quantum-Inspired Evolutionary Programming
IEEE 2013 Tencon - Spring, 2013This paper presents a new technique to determine optimal undervoltage load shedding in a distribution system with load variation. The proposed technique is based on multiobjective approach namely Quantum-Inspired Evolutionary Programming (QIEP). This approach utilised the concept of quantum mechanics in the Evolutionary Programming (EP).
Z. M. Yasin, T. K. A. Rahman, Z. Zakaria
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Undervoltage load shedding for induction motor dominant loads considering P, Q coupling
IEE Proceedings - Generation, Transmission and Distribution, 1999A technique is presented that is suitable for undervoltage load shedding (UVLS) of dominant induction motor loads in power systems. To derive the algorithm, the induction motor voltage-dependent characteristics are formulated along a line parallel to the previously proposed generic dynamic load model.
R. Balanathan +2 more
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