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Abstract-This paper summarizes a set of six benchmark systems for the analysis and control of electromechanical oscillations in power systems recommended by the IEEE Task Force on Benchmark Systems for Stability Controls of the Power System Dynamic Performance Committee. The benchmark systems were chosen for their tutorial value and particular characteristics leading to control system design problems relevant to the research community. For each benchmark, the modelling guidelines are provided, along with eigenvalues and time-domain results produced with at least two simulation software, and one possible control approach is provided for each system as well. Researchers and practicing engineers are encouraged to use these benchmark systems when assessing new oscillation damping control strategies.Index terms-benchmark system, small-signal stability, electromechanical oscillations, damping controller, power system stabilizer.

Abstract-This paper summarizes the work done by the Task Force on Assessing the Need to Include Higher Order Terms for Small-Signal (Modal) Analysis. This Task Force was created by the Power System Dynamic Performance Committee to investigate the need to include higher order terms for small signal (modal) analysis. The focus of the work reported here is on establishing and documenting the practical significance of these terms in stability analysis using the method of Normal Forms. Special emphasis was placed on determining and describing conditions when higher order terms need to be included to accurately describe modal interactions. Test cases were developed on a standard test system to demonstrate the application of appropriate indices to detect the occurrence of nonlinear interaction and hence the need for higher order terms in stability analyzes. The use of the higher order terms in the site selection for a damping controller is also documented.Index Terms-Method of normal forms, modal analysis, modal damping, modal frequency, nonlinear modal interaction.

By using the concept of induced torque coefficients developed in [7], a method is developed for the simultaneous coordination of power system stabilizers (PSSs) and FACTS device stabilizers (FDSs) in order to enhance the damping of the rotor modes of oscillation in a multimachine system. The proposed coordination scheme employs linear programming. However, because eigenanalysis using the QR algorithm is required, it is limited to systems with less than 600-700 states. A case study is given which illustrates the coordination of PSSs and FDSs in a three-area system with 29 stations, 3 SVCs and 400 states.

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