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On the relationship between multiple power-flow solutions and the voltage stability problem in unbalanced three-phase networks.

Abdel-Akher, M. and Ahmad, M. E. and Mahanty, R. N. and Nor, Khaled Mohamed (2008) On the relationship between multiple power-flow solutions and the voltage stability problem in unbalanced three-phase networks. In: 12th International Middle East Power System Conference, MEPCON 2008, 12-15 March 2008.

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Official URL: http://dx.doi.org/10.1109/MEPCON.2008.4562384

Abstract

This paper investigates the relationship between the multiple power-flow solutions and the voltage stability of unbalanced networks. An analysis of an unbalanced two bus network shows that a pair of solutions for the voltage at the neutral point exists at the neutral node. This is two pair of solutions for the terminal voltages at the load bus. One of the interesting findings is that two possible nose curves or PV curves can be constructed for each phase. Each of these curves is a combination of the multiple solutions. Simulation studies have been carried out for the multiple solutions using two-bus network model. Firstly, a constant impedance load model has been utilized to calculate the solution associated with the voltage stability of the study system. Then, its equivalent complex power load is used to calculate the multiple power-flow solutions. The results show that there is a unique point which is directly proportional to the imbalance in the power demand at the load bus. This point is the key to construct the two PV curves. It is used to set a criterion to differentiate between the two PV curves and hence to find out the PV curve related to the voltage stability problem.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Multiple solutions, neutral voltage, PV curves, three-phase power-flow, voltage stability.
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:7566
Deposited By: Nur Amal Zakiah Shamsudin
Deposited On:09 Jan 2009 01:15
Last Modified:01 Jun 2010 15:53

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