K. Daro j and B. Eua-arporn
Loading margin, line margin, minimum margin, P–Q curve, voltagestability, sensitivity factors
A method for evaluating loading margin of each transmission line is proposed in this paper. The feasible line flow boundary of each line is firstly formulated on each P–Q plane. Consequently, loading margin in a specified direction of the increased line flow and the minimum loading margin can be calculated. The proposed method can directly evaluate the loading margin on a P/Q mode at an operating point without the need to transform or define loading scenarios. The obtained margin can then be used as an index to detect the proximity to voltage collapse.
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