A Supplementary Controller to Mitigate Damped Oscillations in Power Systems’ Components Based on the Internal Model Principle

Abstract

A novel control strategy utilizing the Internal Model Principle (IMP) is introduced to mitigate damped oscillations within power systems, specifically targeting low-frequency electromechanical oscillations. This approach involves first identifying the dynamic behaviors of power system oscillations and then integrating these dynamics into the feedback loop. Consequently, leveraging the IMP, the method effectively eliminates oscillations from the system output. Key benefits of this method include its straightforwardness, resilience, capability for real-time deployment, and independence from specific system models. To assess its efficacy, simulation studies were conducted on two operational power systems, complemented by an empirical study on a two-bus laboratory power system at the University of Calgary. Both simulation and empirical findings affirm the method’s effective performance.

Keywords

• Disturbances
• stability
• internal model principle
• damped oscillations
• electromechanical oscillations
• frequency