Practical Controller Design of Three-Phase Dual Active Bridge Converter for Low Voltage DC Distribution System
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- Practical Controller Design of Three-Phase Dual Active Bridge Converter for Low Voltage DC Distribution System
- Choi, Hyun-Jun; Lee, Won-Bin; Jung, Jee-Hoon
- Issue Date
- MDPI AG
- Electronics (Basel), v.9, no.12, pp.2101
- In a low voltage DC (LVDC) distribution system, isolated bi-directional DC-DC converters are key devices to control power flows. A three-phase dual-active-bridge (3P-DAB) converter is one of the suitable candidates due to inherent soft-switching capability, low conduction loss, and high-power density. However, the 3P-DAB converter requires a well-designed controller due to the influence of the equivalent series resistance (ESR) of an output filter capacitor, degrading the performance of the 3P-DAB converter in terms of high-frequency noise. Unfortunately, there is little research that considers the practical design methodology of the 3P-DAB converter’s controller because of its complexity. In this paper, the influence of the ESR on the 3P-DAB converter is presented. Additionally, the generalized average small-signal model (SSM) of the 3P-DAB converter including the ESR of the capacitive output filter is presented. Based on this model, an extended small-signal model and appropriate controller design guide, and performance comparison are presented based on the frequency domain analysis. Finally, experimental results verify the validity of the proposed controller using a 25 kW prototype 3P-DAB converter.
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