A combined model and measurement based scheme for assessment of poorly damped power swings

摘要

Despite the use of power swing damping controllers in FACTS, HVDC and generator excitation systems, poorly damped or undamped swings are occasionally seen in many power systems due to the inability of the controllers to cater to a large variety of operating conditions and swing modes. In such situations, the intervention of system operators is required to steer the system to a stable condition. Online eigen-analysis of the linearized system model may be used to suggest corrective actions, but the results need to be correlated with the actual observations, to correctly identify the critical modes and gain confidence in the proposed actions. Therefore, a combination of model based analysis and wide-area measurement based identification of critical swing modes is essential to provide decision support during actual operation. This paper proposes such a scheme and demonstrates it feasibility by presenting case studies on a realistic large power system.