Damping and synchronizing torques induced on generators by FACTS stabilizers in multimachine power systems

Using modal analysis, a new technique is described for calculating the electrical damping and synchronizing torque coefficients induced on generators through the action of FACTS stabilizers in multimachine power systems. At a given modal frequency and for an increment in gain of each stabilizer, it is possible to assess from an array of induced damping and synchronizing torque coefficients the effect of each stabilizer on the damping of individual generators. Furthermore, using this array, the technique is extended to calculate the contribution of each generator to the eigenvalue shift resulting from the gain increment. To illustrate the application and interpretation of the technique, stabilizers for two SVCs are designed to improve the damping of the inter-area mode in a 11 machine, 2 area power system.