This letter shows the existence of multiple equilibria that arise from the use of the state model of the unified power flow controller (UPFC). These multiple equilibria can arise from a common power injection model for the same terminal conditions of shunt bus voltage and series active and reactive power injections. The multiple equilibria result in two or more sets of eigenvalues, some of which may indicate an unstable operating condition. Therefore, the use of the UPFC power injection model must be used with caution to ensure stable operation of the UPFC.
M. Zarghami and M. Crow, "The Existence of Multiple Equilibria in the UPFC Power Injection Model," IEEE Transactions on Power Systems, vol. 22, no. 4, pp. 2280-2282, Institute of Electrical and Electronics Engineers (IEEE), Nov 2007.
The definitive version is available at http://dx.doi.org/10.1109/TPWRS.2007.907588
Electrical and Computer Engineering
National Science Foundation (U.S.)
Keywords and Phrases
Load Flow Control; Oscillation Damping; Power System Stability; Unified Power Flow Controller (UPFC)
Article - Journal
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