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Traditionally Security Constrained Optimal Power Flow and VAr planning methods consider static security observing voltage profile and flow constraints under normal and post contingency conditions. Ideally, these formulations should be extended to consider dynamic security. This paper reports on a B.C. Hydro/CEPEL joint effort establishing a Dynamic Security Constrained OPF/VAr planning tool which considers simultaneously static constraints as well as voltage stability constraints. This paper covers the details of formulation and implementation of the tool together with the test results on a large scale North American utility system and a reduced Brazilian system.

In this paper it is reported the authors' experience in the application of deconiposition techniques to VAr planning.Numerical exaniples to illustrate the application of the methodology to large scale networks in different planning options, with different combinations of new reactive equipment types and alternative investment cost fiuictions are presented and discussed.

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