This is the final report for the 1997-99 PSerc project on interarea electric power system oscillations. The main project objective was to determine the feasibility of computations to avoid or suppress large scale system oscillations. The main accomplishments of the project are:

1. Discovery and initial analysis of a new mechanism for oscillations in which a strong resonance between two oscillatory modes is a precursor to the oscillations.
2. Assessment of the computational speed of advanced eigenvalue algorithms for oscillations and its scaling with system size.
3. Analysis of a steady state 'angle collapse' instability preceded by resonance in a low frequency oscillatory mode and caused by increasing interarea transfer.
4. Improved eigenvalue sensitivity formulas taking account of the different time scales of oscillations and operator actions.
5. New methods for quantifying the robustness of eigenvalues to uncertainties such as poorly known load or generator data.
6. Nine, fourteen and thirty seven bus systems oscillation test cases.
7. Foundational workto wards a new generation of dynamics software with algebraically assisted numerics.
8. Outline of an opportunity for the combined use of system measurements and model based software for real time control of oscillations.
9. Identification of key barriers to developing software to assist the real time suppression and avoidance of oscillations.

Final report for PSERC project "Avoiding and Suppressing Oscillations" (S-3). Submitted: January 2000. Published: May 16, 2001. Uploaded: May 5, 2003.

Reactive Power Support Services in Electricity Markets: Costing and Pricing of Ancillary Services This project investigated methods for establishing justifiable costs for ancillary services. The current work focused on the issues of costing reactive power and voltage control. This included what has been called congestion charges related to the limitations of transfers due to inadequate voltage support at either load or generation sites. The final report includes on results on these issues as well as reactive market power, reactive loss allocation, and dynamic aspects of reactive power supply.

Final report for PSERC Project M-1 "Reactive Power Support Services in Electricty Markets: Costing and Pricing of Ancillary Services" (M-1). Submitted: August 2000. Published: May 2001.