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Continuation Three-Phase Power Flow: A Tool for Voltage Stability Analysis of Unbalanced Three-Phase Power Systems

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3 Author(s)
Xiao-Ping Zhang ; Sch. of Eng., Univ. of Warwick, Coventry, UK ; Ping Ju ; Handschin, E.

In this paper, a continuation three-phase power flow (CTPFlow) approach in polar coordinates, which can be used to analyze voltage stability of unbalanced three-phase power systems, is proposed. Using CTPFlow, the PV curves of unbalanced three-phase power systems can be obtained. It is found that the patterns of the PV Curves of unbalanced three-phase power systems are quite different from that of balanced three-phase power systems or positive-sequence power systems. The investigations indicate that a CTPFlow is needed where there are unbalanced network or loads existing in a system. Numerical examples are given to illustrate the approach.

Published in:

Power Systems, IEEE Transactions on  (Volume:20 ,  Issue: 3 )