DAB-based Energy Storage System with Flexible Voltage Configuration and Extended Power Capability
2023 IEEE Applied Power Electronics Conference and Exposition (APEC)(2023)
摘要
Product developments and requirements for wide operational voltage range of bidirectional power converters represent a technical challenge. To overcome the limitations of the current state-of-the-art, the proposed DAB-based converter topology employs a switch combination for parallel-series bridges configuration. The switching nodes of the low-voltage (LV) bridges are separately connected at the two transformer terminals. The dc ports of the two LV-bridges are interconnected through a switch interface which allows them to operate in a parallel-series fashion. The DAB-based converter with the switch interface doubles the voltage utilization range, which enables a broad range of applications for batteries (e.g., 48-V, 120-V). The MOSFET power devices within the DAB-based converter are used within their safe operation specification, while the proposed architecture allows flexible voltage configuration for different types of batteries. Furthermore, the proposed DAB-based converter extends the power capability of the converter to advantageously facilitate applications for energy storage systems (ESS). The experimental results have been performed using a 5kW nominal power DAB-based converter with silicon carbide (SiC) and silicon power MOSFET devices.
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关键词
Dual active bridge,parallel-series DAB-based converter
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