Distributed Resilient Event-Triggered Control for Power Quality Improvement in Grid-Tied Microgrid Under Denial-of-Service Attack

This article proposes a distributed event-triggered control method for multifunctional grid-tied inverters (MFGTIs) in microgrid to improve power quality under denial-of-service (DoS) attack. The proposed method tackles two key challenges. The first is dynamic adjustment of inverter residual capacities responding to variations in the accessible renewable power and the harmonic and unbalanced current. The second is DoS-resistant event-triggered control with the following specific functional requirements in power quality improvement task. 1) Quantitative characterization and adjustability of convergence speed and accuracy. 2) Implementation based on sampled data with adjustable sampling period. 3) Reasonableness of DoS attack descriptions. 4) Guidance on selection of parameters. Theoretical analysis proves that the proposed method achieves adequate harmonic and unbalanced current compensation at the point of common coupling without wasting capacity and ensures fair utilization of all MFGTIs, even under DoS attacks. Simulation results further validate the effectiveness of the method.