Generalized proportional integral observer‐based event‐triggered control for frequency regulation in power systems with wind energy
Sumant Anand, Ark Dev, Mrinal Kanti Sarkar
Abstract
Abstract The article addresses a generalized proportional–integral observer (GPIO)‐based event‐triggered control (ETC) for load frequency problems in power systems with wind energy integration. The concept of static event‐triggered mechanism (ETM) with a fixed threshold parameter may be unreasonable in some engineering applications where the transmission rates are time varying as in the case with power systems. Therefore, in this work, a dynamic ETM is designed to dynamically adjust the threshold parameters over time to reflect the time‐varying transmission rates. The unmatched uncertainties are suppressed via high‐gain design while the external disturbance (wind speed) is estimated and attenuated by the GPIO‐based ETC. The proposed design ensures frequency and tie‐line power stabilization and saves the computational and communication resources more effectively than recently reported works in the field. The hybrid closed‐loop system's global bounded stability is theoretically proved and verified by simulation in three‐area interconnected power systems.