Abstract
This study addresses some issues related to reactive power support in electric power systems. This study considers the QV curve as a tool for indicating the robustness of generators in terms of their reactive power margin (RPM). The QV curve yields information that is then considered for contingency studies. Then, the dynamic behaviour of a system with respect to the RPM is investigated. A positive margin, the study shows, may drive a system to instability. To move the system to a secure region, fuzzy logic is proposed and the effects are dynamically analysed. To simulate the proposed methodology, the study employs a sample system of five buses and a real Brazilian system.
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