AbstractAs the power system advances, the competition among the power companies becomes heated, and they seek more efficient system planning using existing facilities. Therefore, an efficient system planning method is desirable. This paper proposes a quantitative evaluation method for the (N–1) generation margin considering overload and voltage stability constraints. Concerning the generation margin related to overload, a fast solution method without recalculation of the (N–1) Y‐matrix is proposed. With reference to voltage stability, this paper proposes an efficient method of seeking the stability limit. The IEEE30 model system, composed of six generators and 14 load nodes, is employed to validate the proposed method. According to the results, the proposed method can reduce the computational cost for obtaining the generation margin related to the overload and the voltage stability limit under the (N–1) condition, and can specify the value quantitatively. © 2012 Wiley Periodicals, Inc. Electr Eng Jpn, 181(4): 19–28, 2012; Published online in Wiley Online Library (wileyonlinelibrary.com). doi 10.1002/eej.21234
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