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This paper presents and discusses a methodology to include in the power system security assessment and control functions a module to deal with oscillatory phenomena, namely Hopf Bifurcations. The proposed procedure is based on the computation of sensitivities of the distance of an operating point of interest to the Hopf Bifurcation in the parameter space, and considers as control variable the pilot busbar voltage of the eventual Secondary Voltage Regulation scheme. A criterion is presented to deal with the problem in a multi-area scenario. The bifurcation diagrams are obtained directly from the DAE system. Numerical results are presented for the New England test system, demonstrating the potentiality of the proposed methodology on the Hopf Bifurcation control.Index Terms--Hopf bifurcation, modal analysis, security assessment, security enhancement, secondary voltage regulation.

This paper presents initial project and test results of an active power control scheme development for auxiliary synchronous generators of an AES-Distribution System connected Hydraulic Generation Unit. An open loop control system using TCSC switched by IGBT's is proposed to compensate the inductive impedance of the synchronous generator and control the active power injection. Several switching angles were evaluated at different compensation levels and simulations are presented to analyze the effectiveness and robustness of the proposed controller project.