What is it about?
This paper discusses the design of a unified control framework for a battery energy storage system (BESS) that can operate in both grid-connected and standalone modes. The goal is to ensure a smooth transition between the two modes and efficient power distribution. A single unified controller is proposed instead of using different individual controllers for each mode. This approach is evaluated through simulations of different case studies.
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Why is it important?
The unified controller’s main feature is its ability to ensure accurate active and reactive power-sharing with other DERs. It can also provide fast control actions in the grid-tied mode for frequency and voltage support and power control following reference signals from secondary-level control. In islanded mode, it can synchronize and link the BESS to the external main grid or other DERs with minimal transients.
Perspectives
This paper models and simulates a unified controller framework for the power grid to assess its performance in enhancing power quality. The simulations show that the unified BESS controller can significantly improve system voltage and frequency containment. The results are verified using defined metrics and show that the grid-forming control strategy outperforms the grid-following one in achieving better power quality and offering greater integration flexibility.
Dr. Mohammad Rezwan Khan
Aalborg Universitet
Read the Original
This page is a summary of: Design of a unified controller framework for Grid-tied and Grid-forming battery energy storage system, October 2022, Institute of Electrical & Electronics Engineers (IEEE),
DOI: 10.1109/iecon49645.2022.9968382.
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