[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.
Application of DC Power Supply Air-conditioning Units in Urban Rail Transit Vehicles
2025
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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