An Observer-Based Distributed Cooperative Event-Triggered Control Scheme for an AC Microgrid
S. Arunima, Bidyadhar Subudhi
Abstract
This paper presents a dynamic event-triggered control (DEvTC) scheme to achieve resiliency against communication latencies. A cooperative controller is designed to establish communication between Distributed Generation (DG) sources in an AC microgrid. In the proposed controller, an observer is used to accurately track the voltage/frequency of the DGs in a microgrid to the reference values in the face of uncertainties due to time delay and Denial-of-Service (DoS) attacks. The control variables under any short/long-delay DoS attacks are estimated using a predictive compensation algorithm in the proposed controller and are also independent of the system parameters. Simulation of the proposed controller is pursued using MATLAB Simulink, followed by OPAL-RT real-time experimentation to analyze its efficacy. The results envisage that the proposed controller is robust in handling DoS attacks and communication delays. The performance of the proposed event-triggered control scheme is compared with an event-triggered control scheme of single-order dynamics. The results show that the former is more efficient in handling uncertainties due to DoS attacks.