Adaptive Event-Triggered Load Frequency Control for Interconnected Microgrids by Observer-Based Sliding Mode Control

Abstract

This paper focuses on the load frequency control (LFC) for a multi-area interconnected microgrid power system with the introduction of communication networks, a robust sliding mode control strategy based on the adaptive event-triggered mechanism is proposed against the frequency deviation caused by power unbalance or time delays. First, a three-area power system attached to renewable energies and energy storage is considered, the corresponding LFC model is established. Second, the networked control is introduced into the LFC scheme, and the adaptive trigger mechanism which can adaptively adjust the event-triggered threshold is designed to improve the data transmission efficiency, the LFC scheme with network induced delays is formulated. Third, the Luenberger observer is designed to estimate the state errors and to facilitate the design of the sliding surface, the overall closed-loop system asymptotically stable and robust performance are analyzed by solving linear matrix inequalities. Then the control law is proved that the system state trajectory can be driven into the designed sliding surface in a limited time. Finally, some simulation experiments are given, and the results show that the proposed method is effective and has excellent robust performance.

Keywords

• Microgrid power system
• load frequency control
• event-triggered control
• robust performance
• sliding mode observer