[Objective] Currently, air-conditioning units in urban rail transit vehicles predominantly use an AC (alternating current) 380 V power supply mode, which requires two power conversions before reaching the end-use equipment, inevitably leading to some energy loss. Therefore, it is necessary to study the feasibility of applying DC (direct current)-powered air-conditioning units in urban rail transit vehicles. [Method] The operation mode of conventional AC 380V power supply is introduced, and a comparison is made between the circuit topologies of air-conditioning units under AC 380 V and DC 600 V power supply modes. The internal configurations of air-conditioning units in these two power supply modes are also compared. An energy-saving test is conducted using air-conditioning units of a rail transit vehicle in a Chinese city as example. Energy consumption indicators of the air-conditioning unit compressors under different frequencies for both power supply modes are tested, and a comparative analysis is performed on the energy consumption of conventional asynchronous motor fans and EC (electronically commutated) fans. [Result & Conclusion] Compared to AC 380 V-powered air-conditioning units, DC 600 V-powered units eliminate the two power conversion processes on the vehicle, achieving more significant energy saving effects. Additionally, DC 600 V-powered air-conditioning unit compressors demonstrate more pronounced energy-saving effects during low-frequency operation. Compared to conventional asynchronous motor fans, EC fans are more energy-efficient.


    Access

    Download


    Export, share and cite



    Title :

    Application of DC Power Supply Air-conditioning Units in Urban Rail Transit Vehicles


    Contributors:
    KANG Wei (author) / ZHAO Jun (author) / QI Xin (author) / YU Guanglu (author) / CHEN Yuan (author)


    Publication date :

    2025




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown




    Integrated power supply air conditioning unit for rail transit vehicle

    JIANG YU / YIN HANG / WEI BAITAO | European Patent Office | 2024

    Free access

    Application of Bidirectional Converters in Urban Rail Transit Power Supply Systems

    Mao WANG / Yuebin ZHENG / Lei SONG et al. | DOAJ | 2024

    Free access

    Urban rail transit non-network application library and power supply system

    LI WEI / ZHU TIEMEI / TU HANQING et al. | European Patent Office | 2023

    Free access

    Urban rail transit traction power supply system and substation

    LIU CHANGZHI / LIU BIN / ZHENG LIYUN et al. | European Patent Office | 2020

    Free access

    Urban rail transit AC-DC hybrid power supply system

    CHEN HUAIXIN / WANG SHIFENG / ZHANG HAORAN et al. | European Patent Office | 2024

    Free access