An investigation of an uninterruptible power supply (UPS) based on supercapacitor and liquid nitrogen hybridization system

[Display omitted] •A hybrid UPS based on supercapacitor and liquid nitrogen engine is proposed.•The dynamic modelling of the hybrid UPS system is conducted.•The dynamic working performance is obtained and analysed based on the simulation.•The hybrid UPS enjoys environmental benignity, long life and...

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Bibliographic Details
Published in:Energy conversion and management 2014-09, Vol.85, p.784-792
Main Authors: Zhang, Xinjing, Xue, Haobai, Xu, Yujie, Chen, Haisheng, Tan, Chunqing
Format: Article
Language:English
Subjects:
Applied sciences
Capacitors
Carbon
Electric power generation
Energy
Energy storage
Exact sciences and technology
Hybrid systems
Liquid nitrogen
Simulation
Supercapacitor
Supercapacitors
Uninterruptible power supplies
UPS
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Summary:[Display omitted] •A hybrid UPS based on supercapacitor and liquid nitrogen engine is proposed.•The dynamic modelling of the hybrid UPS system is conducted.•The dynamic working performance is obtained and analysed based on the simulation.•The hybrid UPS enjoys environmental benignity, long life and easy maintenance.•It is a highly possible solution to replace conventional UPS systems. An uninterruptible power supply (UPS) system based on supercapacitor and liquid nitrogen (LN2) hybridization is first introduced in this paper. Of the newly designed UPS, the supercapacitor reacts instantaneously once the main supply fails, and it also starts the LN2 power system to produce continuing electricity for the customer. This hybrid UPS system is of environment cleanness, long life time, easy maintenaince, etc. A 10kW model is analyzed in this study. A two-stage nitrogen expander is designed with the rated speed of 900rpm as the long time power generation device of the LN2 cycle. The UPS starting process calculation is carried out. The results reveal that commercial supercapacitors could fulfill this request. This UPS could be a competent choice for the UPS application. Further discussion indicates the LN2 power system could be used widely from UPS to low carbon vehicles.
ISSN:0196-8904
1879-2227
DOI:10.1016/j.enconman.2014.01.058