AUTHORS: Hajer Jmii, Asma Meddeb, Souad Chebbi

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ABSTRACT: Steady state security assessment becomes a stringent need as it provides the knowledge about the state of the system following a contingency. This paper presents a Newton-Raphson load flow based method for voltage security assessment. A voltage performance index is computed firstly to classify contingencies in secure, insecure and critical classes and then to rank them in the decreased order of severity. The proposed approach is tested on the IEEE 39-bus system by performing (N-1) contingency for different load conditions.

KEYWORDS: Classification, load flow, Newton-Raphson, (N-1) contingency, performance index, steady state security assessment.

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