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PacDyn is a production-grade software package for the analysis and control of small-signal stability of large power systems. PacDyn employs state-of-the-art algorithms for the calculation of poorly-damped eigenvalues, dominant poles and transfer function zeros, transfer function residues, linear time response and frequency response plots, generator synchronizing and damping torques. It has been used in the stabilization studies of six large interconnected systems, in various parts of the world.

The program is suitable for use in sub-synchronous resonance (ssr) studies, and incorporates advanced svc and tcsc models for this purpose.

An important feature is the ability to read various network and dynamic data file formats, allowing smooth integration with other power system analysis packages .