Distributed current edge-control strategy based on cyber-energy dual modulations with quantized state for DC...

Area of Science:

• Electrical Engineering
• Control Systems
• Smart Grids

Background:

• Cyber-Energy Dual Modulation (CEDM) enables information exchange in DC microgrids without extra communication lines, but suffers from low bandwidth.
• Traditional distributed control methods require high communication bandwidth, making them unsuitable for CEDM-based systems.

Purpose of the Study:

• To propose a novel distributed current edge-control strategy for DC microgrids that overcomes the limitations of low-bandwidth CEDM.
• To achieve reliable information exchange and stable output consensus in DC microgrids with reduced communication costs.

Main Methods:

• A quantized CEDM protocol is developed to facilitate low-bandwidth communication and decrease communication expenses.
• The strategy integrates quantized state information with CEDM, dynamic event-triggered control, and H_∞ consensus.
• A distributed current edge-control approach is implemented.

Main Results:

• Simulations demonstrate successful output consensus in DC microgrids under varying droop gains and external disturbances.
• The maximum observed output error was 1.568×10^-2, indicating high accuracy.
• An event-triggered mechanism significantly reduced the communication burden, with average triggering intervals between 10^-2 and 10^-1 seconds.

Conclusions:

• The proposed distributed current edge-control strategy effectively achieves output consensus in DC microgrids using low-bandwidth CEDM.
• The integration of quantized state information, event-triggered control, and H_∞ consensus offers a viable solution for efficient microgrid control.
• This approach reduces communication costs and burden while maintaining system stability and performance.