A comprehensive methodology for assessing power oscillation damping controllers for HVDC-based system stabilization

Many modern transmission systems suffer from electromechanical oscillations due to the large size of interconnected electrical networks. High Voltage Direct Current (HVDC) lines offer the potential to help with power oscillation damping (POD) for stability improvement purposes. In this study, a methodology is developed to assess potential POD controller designs. This methodology accounts not only for performance improvement (as is typical) but also controller robustness, simplicity and scalability. Partial Swarm Optimized (PSO) power system stabilizer (PSS), multiple operating points PSO-PSS and traditionally tuned PSS have been designed and assessed. All POD controllers were assessed both a two-area four-machine system and New England test system (NETS) and New York power system (NYPS) large realistic system.