Skip to content
2000
Volume 14, Issue 2
  • ISSN: 2352-0965
  • E-ISSN: 2352-0973

Abstract

Background: Conventional micro-grids operate autonomously in islanded mode but they always rely on the utility grid for BUS voltage support and power balance in the grid-connected mode. This results in non-seamless mode switching, alternating operation strategy and power exchange fluctuation problems. Methods: An AC/DC/AC converter is utilized as the interface between the micro-grid and the utility grid. This enables the two entities to have different voltages in the grid-connected mode. The microgrid exchanges predefined amount of power with the utility grid in the grid-connected mode. The power amount is estimated based on power forecasting of local generations and loads with the consideration of the Sate of Charge (SOC) of the battery, and is updated and broadcasted every 15 minutes. Results: A 100kVA AC micro-grid with a rotating generator, battery storage and solar arrays is built on Matlab/Simulink for investigation. Results indicate that the battery can effectively balance the power flow and mode switching hardly causes distortions. Conclusion: The proposed micro-grid can operate autonomously in both grid-connected and islanded mode without relying on the utility grid. Seamless switching between operation modes can be achieved naturally. Constant power is exchanged with the power grid, which benefits the powerdispatching algorithm of the power system.

Loading

Article metrics loading...

/content/journals/raeeng/10.2174/2352096513999201026225452
2021-03-01
2025-07-10
Loading full text...

Full text loading...

/content/journals/raeeng/10.2174/2352096513999201026225452
Loading
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error
Please enter a valid_number test