研究目的
To present a universal power converter building block with isolation transformer for performing various functionalities such as G2V, V2G, and V2L, capable of outputting different voltage types and levels, and achieving high power density using SiC MOSFETs and nanocrystalline core transformer.
研究成果
The universal power converter building block enables bidirectional power flow with versatile voltage output capabilities. Control algorithms for G2V, V2G, and V2L are effective, and the use of SiC MOSFETs and nanocrystalline core transformer contributes to high power density. Future work includes investigating soft switching regions and improving transformer design for better reliability.
研究不足
The isolation transformer hardware is being evaluated and no experimental data is available; soft switching regions for different applications need further investigation; methods for copper loss reduction in the transformer are not fully addressed.
1：Experimental Design and Method Selection:
The paper describes a circuit topology using a dual active bridge (DAB) with SiC MOSFETs and an isolation transformer. Control algorithms for G2V, V2G, and V2L modes are implemented, including PWM rectifier control and DAB control with dual phase shift (DPS) for lower current stress.
2：Sample Selection and Data Sources:
Simulation results are used to validate the converter's capability, with parameters such as 25kW power, 480V three-phase grid, 700V DC bus voltage, 350V nominal battery voltage, and 100kHz switching frequency.
3：List of Experimental Equipment and Materials:
SiC MOSFET power modules, isolation transformer with nanocrystalline core, Litz wire (1500 strands AWG 38), capacitors (e.g., 5000uF C1, 20uF C2), and interfacing inductors (20uH).
4：Experimental Procedures and Operational Workflow:
The converter is simulated for different operation modes; for G2V, power flows from grid to battery with PWM rectifier and DAB control; for V2G, power flows from battery to grid with grid-connected inverter control; for V2L, power flows to DC or AC loads with appropriate control strategies.
5：Data Analysis Methods:
Simulation results are analyzed to show performance metrics like current stress, power factor, and voltage regulation; MATLAB scripts are used for optimization of turns ratio and current stress.
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