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Slack bus selection to minimize the system power imbalance in load-flow studies

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3 Author(s)
Gomez Exposito, A. ; Dept. of Electr. Eng., Univ. of Seville, Spain ; Martinez Ramos, J.L. ; Santos, J.R.

This paper reconsiders the notion of slack bus in load-flow studies. Instead of determining a priori which bus plays the role of slack bus, it is selected on the fly during the load-flow iterative process in such a way that the system power imbalance is minimized. The problem of selecting the best slack bus, or buses, is first formulated as a nonlinear optimization problem. Then, the results obtained are justified on the basis of the involved equality constraint being a quasilinear function, leading to an LP problem with trivial solution. It turns out that the optimal solution can be easily found from the results of a conventional load flow at a moderate cost. The proposed heuristic procedure is tested on the IEEE test systems.

Published in:

Power Systems, IEEE Transactions on  (Volume:19 ,  Issue: 2 )