The invention relates to the technical field of bidirectional DCDC conversion systems, in particular to a bidirectional isolated buck-boost DCDC conversion system of a hydrogen fuel cell hybrid power locomotive, and solves the technical problems that an existing bidirectional non-isolated DCDC conversion system can only realize unidirectional boost or buck conversion, and inductance and current ripples at an input end or an output end are relatively large. The low-voltage side is connected with a hydrogen fuel cell system, and the high-voltage side is connected with a direct-current bus of a locomotive traction auxiliary converter power battery; the system comprises two groups of identical and independent isolation DCDC conversion systems, and each group of isolation DCDC conversion system comprises two groups of high-voltage and low-voltage side pre-charging loops, two groups of DCAC boost/buck and resonance modules, four groups of isolation transformers and two groups of ACDC inversion/rectification modules; the two groups of DCAC step-up/step-down and resonance modules are correspondingly connected with the two groups of ACDC inversion/rectification modules through the four isolation transformers, the DCAC step-up/step-down and resonance modules are connected to the primary sides of the isolation transformers, and the ACDC inversion/rectification modules are connected to the secondary sides of the isolation transformers.

    本发明涉及双向DCDC变换系统技术领域,尤其涉及一种氢燃料电池混合动力机车双向隔离升降压DCDC变换系统,解决现有双向非隔离式DCDC变换系统,只能单向升压或者降压变换、输入或输出端存在电感和电流纹波较大的技术问题,其低压侧连接氢燃料电池系统,高压侧连接机车牵引辅助变流器动力电池的直流母线;其包括两组相同的、独立的隔离DCDC变换系统,每组隔离DCDC变换系统包括高、低压侧两组预充电回路、两组DCAC升/降压与谐振模块、四组隔离变压器和两组ACDC逆变/整流模块;两组DCAC升/降压与谐振模块通过四个隔离变压器与两组ACDC逆变/整流模块对应相连,DCAC升/降压与谐振模块连接至隔离变压器的原边,ACDC逆变/整流模块连接至隔离变压器的副边。


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    Title :

    Bidirectional isolation buck-boost DCDC conversion system of hydrogen fuel cell hybrid power locomotive


    Additional title:

    氢燃料电池混合动力机车双向隔离升降压DCDC变换系统


    Contributors:
    WANG JINGSI (author) / YANG LU (author) / LI SHOURONG (author) / GU XIUJIANG (author) / GUAN JUNQING (author) / WANG QUANCE (author) / PEI BING (author) / GAO FEIFEI (author)

    Publication date :

    2024-03-15


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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