Although a closest bifurcation point (CBP) is known to be a superior security measure against voltage collapse, no fast computation methods exist presently. In such a circumstance, the authors have proposed an approximation method of CBP in(11) where two major problems are left unsolved. They are: (1) the method cannot take into Q limits of generators and (2) it utilizes a low volt-age power flow solution, which is not easily obtained unless a suitable initial estimate is available.
This paper presents a series of techniques to solve these problems. It is shown that the proposed method can provide fairly accurate CBP without suffering from any major problems. The total computation time is not more than that of ten power flows even when no information of low voltage solution is available in advance. The proposed method will make it possible a reliable on-line monitoring and control of voltage stability.
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