Study on Design and Testing of High-power Boost DC/DC Converter for Hydrogen Powered Rail Vehicles
Following the continuous development of hydrogen powered rail vehicles,the power level of the fuel cell system is gradually increased.Based on the power need of hydrogen powered rail vehicles,this article customizes the development of a high-power DC/DC converter,describes in detail the design process of the boost DC/DC converter for fuel cells and the calculation and analysis for selection of its key components.A converter simulation model has been built up with Simulink for simulation analysis and finally the product tests have been performed on the DC/DC converter.The test result shows that the input voltage display precision of 300 kW DC/DC converter≤±2 V,the output voltage precision≤±3 V,the input and output current ripple<±1%and the peak efficiency>98%when the rated operating efficiency≥95%.Due to the use of the silicon carbide devices with superior high-frequency characteristics and the multi-channel interleaved parallel control,the input and output ripple currents are effectively reduced.At the same time,the lightweight and miniaturized design also reduces the volume and the mass of the system.The bidirectional DC/DC converter can be used to control the output power of fuel cells,providing a hardware foundation for subsequent installation or laboratory debugging and verification of the hydrogen fuel cell system.
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