Design of a dual bidirectional DC/DC converter for hybrid energy storage management in microgrids
Keywords:
Hybrid energy storage , Multivariable PI control, Smart microgrids, dual bidirectional DC/DC converter, Smart microgridsAbstract
The efficient integration of renewable sources into microgrids requires advanced solutions to manage energy variability and ensure stability in the direct current (DC) bus. This article proposes a dual bidirectional DC/DC converter with a Buck-Boost topology, designed to independently control the energy flow between a hybrid energy storage system (batteries and supercapacitors) and a 48 V DC bus. The converter employs a closed-loop control scheme with three PI controllers, which simultaneously monitor and adjust: (1) the charge/discharge current of the storage devices, (2) the voltage across these elements, and (3) the DC bus voltage. Implemented in Simulink MATLAB R2023b and experimentally validated, the design demonstrated 94% efficiency, the ability to operate in boost mode (24 V → 48 V) and buck mode (48 V → 12 V), and active protection against battery voltage drops. The results highlight its capability to manage power peaks with supercapacitors and sustained demands with batteries, reducing thermal stress and extending their lifespan. This solution positions itself as a scalable alternative for resilient microgrids, optimizing renewable integration and ensuring stable power supply in dynamic scenarios.Downloads
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