Analysis of power system stabilizers application for controlling poorly damped oscillations in the Alcan/BC hybrid power systems

The study requirements to determine the effect of power system stabilizers in controlling the undamped system oscillations in interconnected power systems are described. This analysis is performed for the planning of excitation systems for new generators at Kemano, BC, Canada as well as excitation upgrade for the existing Kemano units. Available small signal stability and transient stability simulation techniques are used. Application of the trapezoidal rule in analyzing the stabilizer control scheme is also presented. A general approach to determine the optimum setting of power system stabilizers with more than one input by the root locus techniques is developed. The usefulness of the power system stabilizers in the exciters for controlling these oscillations is analyzed. Representative excitation systems with power system stabilizers are obtained from the manufacturer. The analyses of small signal stability are conducted for both an interconnected Alcan Smelters and Chemicals Ltd.-BC Hydro system and separated Alcan system