Abstract

In this paper, an extended-L (EL) index is considered as a voltage stability constraint in optimal power flow (OPF) which guarantees adequate voltage stability margin (VSM) for an electricity market solution. The EL-index uses a generator equivalent model (GEM) that has significant effect on voltage stability studies. Two important objective functions which are maximization of the social welfare and minimization of the operating cost function are studied in the voltage stability constrained OPF (VSC-OPF) method. The proposed VSC-OPF is also compared with different existing methods. This method is analyzed in detail and it is tested on a six-bus and IEEE 39-bus test system. The results show that the proposed algorithm operates successfully.

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