Fixed-time distributed secondary control for voltage/frequency restoration and power sharing in microgrids under...

Area of Science:

• Electrical Engineering
• Control Systems
• Renewable Energy Systems

Background:

• Current distributed secondary control in microgrids faces challenges in balancing fast voltage/frequency restoration with accurate proportional active power sharing, especially under dynamic switching topologies.
• These limitations hinder the widespread practical implementation of advanced microgrid control strategies.

Purpose of the Study:

• To develop a novel distributed fixed-time secondary controller for microgrids.
• To achieve simultaneous voltage/frequency consensus, proportional active power sharing, and adaptability to switching topologies for distributed generation units.

Main Methods:

• Utilizing Lyapunov theory to demonstrate asymptotic stability under switching topologies.
• Employing bi-limit homogeneity theory to establish sufficient conditions for fixed-time stability.
• Conducting hardware-in-the-loop experiments to validate the controller's performance.

Main Results:

• The proposed controller ensures voltage and frequency consensus among distributed generation units.
• Accurate proportional active power sharing is achieved.
• The controller exhibits adaptability to switching network topologies, a key advantage over existing methods.

Conclusions:

• The novel distributed fixed-time secondary controller effectively addresses the limitations of current microgrid control strategies.
• The controller offers improved stability, faster response, and accurate power sharing, making it suitable for practical microgrid applications.
• Hardware-in-the-loop experiments confirm the controller's effectiveness and advantages in realistic operating conditions.