A Novel High-Gain DC-DC Converter Applied in Fuel Cell Vehicles

 ABSTRACT:

The DC-DC converter for fuel cell vehicles should be characterized by high-gain, low voltage stress, small size and high-efficiency. However, conventional two-level, three-level and cascaded boost converters cannot meet the requirements. A new non-isolated DC-DC converter with switched-capacitor and switched-inductor is proposed in this paper, which can obtain high-gain, wide input voltage range, low voltage stresses across components and common ground structure. In this paper, the operating principle, component parameters design, and comparisons with other high-gain converters are analyzed. Moreover, the state-space averaging method and small-signal modeling method are adopted to obtain the dynamic model of converter. Finally, simulation and experimental results verify the effectiveness of the proposed topology. The input voltage of the experimental prototype ranges from 25V to 80V. The rated output voltage is 200V and rated power is 100W. The maximum efficiency is 93.1% under rated state. The proposed converter is suitable for fuel cell vehicles.

KEYWORDS:

1.      Fuel cell vehicles

2.      DC-DC converter

3.      Switched-capacitor and switched- inductor

4.      High-gain

5.      Low voltage stress

SOFTWARE: MATLAB/SIMULINK

 CONCLUSION:

This paper presents a non-isolated DC-DC converter topology for fuel cell vehicles. The proposed converter can obtain high-gain and wide input voltage range. The voltage gain can reach 2(1−d)/(1−2d) and duty cycle d<0.5 while achieving high-gain. The voltage stresses across components are less than half of the output voltage, which is beneficial to reduce the size and cost of the converter. In addition, the circuit topology is a common ground structure, which can avoid EMI and safety problems. The converter can always maintain the stability of the output voltage by closed-loop control. There are not the voltage overshoot and impulse current during soft-start process by adopting the soft-start program. Under the rated state, the measured maximum efficiency of the prototype is 93.1%. The proposed converter is suitable for fuel cell vehicles.

REFERENCES:

[1] G. Du, W. Cao S. Hu Z. Lin and T. Yuan “Design and Assessment of an Electric Vehicle Powertrain Model Based on Real-World Driving and Charging Cycles ” IEEE Trans. Veh. Technol., vol. 68, no. 2, pp. 1178-1187, Feb. 2019.

[2] Z. Geng, Q. Chen, Q. Xia D. S. Kirschen and C. Kang “Environmental Generation Scheduling Considering Air Pollution Control Technologies and Weather Effects ” IEEE Trans. Power Syst., vol. 32, no. 1, pp. 127-136, Jan. 2017.

[3] H. Bi P. Wang and Y. Che “A Capacitor Clamped H-Type Boost DC-DC Converter With Wide Voltage-Gain Range for Fuel Cell Vehicles ” IEEE Trans. Veh. Technol., vol. 68, no. 1, pp. 276-290, Jan. 2019.

[4] L. Li, S. Coskun, F. Zhang R. Langari and J. Xi “Energy Management of Hybrid Electric Vehicle Using Vehicle Lateral Dynamic in Velocity Prediction ” IEEE Trans. Veh. Technol., vol. 68, no. 4, pp. 3279-3293, Apr.2019.

[5] N. Elsayad, H. Moradisizkoohi, and O. A. Mohammed “A Single-Switch Transformerless DC-DC Converter With Universal Input Voltage for Fuel Cell Vehicles: Analysis and Design ” IEEE Trans. Veh. Technol., vol. 68, no. 5, pp. 4537-4549, Mar. 2019.