In FACTS devices auxiliary signals are widely used to enhance damping and mitigation of Subsynchronous Resonance in Power System. Choice of auxiliary signals is indeed a difficult choice. In this paper STATCOM is installed in the middle of Power system and it is shown that computed generator internal frequency is a very suitable auxiliary signal. Study system is IEEE first benchmark model. Modeling of STATCOM with IEEE first benchmark model is presented in detail. All the differential equations and initial conditions are presented in the paper. Results are shown at 50% series compensation. Keywords-STATCOM; supplementary signals; power system stability; IEEE first benchmark model
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