Abstract:
High-voltage and large-capacity energy storage devices are needed for vessel integrated power systems (IPS) to equip more high-energy pulse loads and increase power supply dependability. Based on this background, this study discusses a cascaded DC-DC converter super capacitor energy storage system using modular multilevel converters (MMC) and dual active bridges.
The cascaded converter is MMC-DAB. This paper details the system’s architecture and modulation approach. This research presents a control approach where the DAB module of each branch separately regulates the sub-module capacitor voltage to address the drawbacks of the bidirectional power control technique.
We create mathematical models of the standard and alternative control strategies. We compare the stability of the two control techniques. Finally, the MMC-DAB energy storage system’s MW-level engineering prototype is conceived and built, and trials verify the control strategy’s efficacy.
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