Distributed Resilient Secondary Control Strategy Considering Economic Dispatch for DC Microgrids: A Dynamic...

Area of Science:

• Electrical Engineering
• Control Systems
• Power Systems

Background:

• DC microgrids face challenges with secondary control due to cyber-attacks and communication bandwidth limitations.
• Existing control strategies may not adequately address both voltage stability and economic dispatch under adversarial conditions.

Purpose of the Study:

• To propose a unified distributed resilient control strategy for DC microgrids.
• To achieve simultaneous voltage restoration and optimal power allocation (economic dispatch).
• To enhance microgrid performance under cyber-attacks and limited communication bandwidth.

Main Methods:

• Integration of a dynamic event-triggered mechanism (DETM) with distributed control protocols.
• Design of a voltage regulator using a distributed average voltage estimator and PI controller.
• Development of a power regulator with a distributed optimal power controller and PI controller.
• Analysis of convergence and optimality using Lyapunov stability and convex optimization.

Main Results:

• The proposed strategy effectively restores microgrid voltage to appropriate levels.
• Optimal power allocation (economic dispatch) is maintained even under cyber-attacks.
• The dynamic event-triggered mechanism reduces communication load while ensuring system performance.
• Case studies validate the enhanced security, robustness, adaptability, and economy of the DC microgrids.

Conclusions:

• The unified distributed resilient control strategy is effective for DC microgrids.
• The approach enhances microgrid resilience against cyber-attacks and communication constraints.
• The strategy ensures both stable operation and economic efficiency in DC microgrids.