Abstract
Reliable frequency regulation of power systems integrated with low-inertia variable renewable energy generations (REGs) is crucial in islanded mode operation. It demands a resilient control framework to uphold grid stability/security against undeniable physical disturbances/cyber-attacks. This work maidenly develops and applies a fuzzy disturbance observer (FDO)-based resilient frequency controller to advance the dynamic stability of REGs-integrated large-scale power plants. Further, to enhance the damping of frequency/power oscillations, hydrogen energy storage (HES) has been incorporated, and its effectiveness is analyzed. The estimated disturbance using FDO is augmented into secondary control law derived from a non-singular terminal sliding mode strategy to increase active disturbance rejection proficiency of the overall closed-loop system. The global exponential finite-time stability of the testbed under the developed control framework has been rigorously reviewed using the Lyapunov theory. The qualitative assessment of simulation outcomes has confirmed the proficiency and resiliency of the developed control framework regarding superior frequency regulation against unknown disturbance inputs. The practicability of the developed control framework has been further quantified on IEEE 68-bus large-scale testbed, and a comparative study is presented following unknown/uncertain disturbances. Lastly, the cyber-tolerance of the applied resilient controller has been established against detectable DoS cyber-attack.
Published Version
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