Power management with BMS to modified interlinking converter topology in hybrid AC/DC microgrid

This paper presents a battery management system (BMS) for a modified interlinking converter in a hybrid AC/DC microgrid. The power management strategy (PMS) employs the BMS to avoid the battery operation in harmful conditions, increasing the battery banks' life cycle. Besides, techniques for power-sharing, power quality mitigation, and grid formation are also presented in the PMS. This study proposes the PMS for a hybrid microgrid operating in the grid-connected and standalone mode. The modified interlinking converters are composed of an interlinking converter (ILC) and a two-stage interlinking converter-energy storage device (TSILC-ESD), acting according to the operation mode. The ILC works as a grid-forming to the DC microgrid in the grid-connected mode, while the TSILC-ESD acts as a grid-supporting unit for both microgrids. In this case, when the BMS actuates, the TSILC-ESD is disabled. For standalone mode, the ILC is responsible for forming the AC microgrid, while the TSILC-ESD forms the DC microgrid. Moreover, the TSILC-ESD also renders support to the AC microgrid. To maintain the formation of both grids, the BMS applies a load or source selectivity, according to SoC conditions. To evaluate the performance of the proposed BMS, PMS, and interlinking converters, simulations are performed in the Matlab/Simulink software. The results show an appropriate performance for the hybrid microgrid in the grid-connected and standalone modes, while a satisfactory BMS response is achieved during the operation restrictions. (c) 2022 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

This paper presents a battery management system (BMS) for a modified interlinking converter in a hybrid AC/DC microgrid. The power management strategy (PMS) employs the BMS to avoid battery operation in harmful conditions, increase battery banks' life cycle, and provides techniques for power-sharing, power quality mitigation, and grid formation. Simulations were performed to evaluate the performance of the proposed BMS, PMS, and interlinking converters, showing appropriate performance for the hybrid microgrid in both grid-connected and standalone modes, and satisfactory BMS response during operation restrictions.