A novel event-triggered secondary control strategy for microgrid considering time-varying delay

Abstract

To enhance the efficiency of communication in distributed microgrids (MGs), this study introduces a novel event-triggered secondary control strategy that incorporates time-varying delays. Unlike traditional continuous event-triggered controls that risk Zeno behavior, and periodic controls that fail to utilize all data effectively, compromising control quality and real-time performance, this strategy employs a hybrid approach. Each distributed generator (DG) within the MG is treated as an agent, and the control system is designed based on multi-agent consensus theory, allowing for a dynamic switch between periodic sampling and continuous event triggering. The formulation of the event-triggered function for the secondary controller is detailed, and its stability is validated using Lyapunov stability theory. Simulation results confirm that this innovative controller achieves precise secondary regulation of voltage and frequency, along with accurate power sharing among DGs, significantly reducing the need for frequent communication.

Keywords

• Microgrid
• Event-triggered control
• Lyapunov stability
• Multi-agent consensus
• Time-varying delay