Kongzhi Yu Xinxi Jishu (Oct 2023)
Hydrogen Hybrid Power System and Its Control Strategy for Autonomous-rail Rapid Tram
Abstract
In the context of increasing application of autonomous-rail rapid transit (ART) at home and abroad, in order to meet the diverse power system requirements in various scenarios and the operating range demands in different operation modes, this paper presents the design of a hybrid power system based on fuel cells and lithium iron phosphate power batteries, taking into account the characteristics of different energy sources and the operating conditions of autonomous-rail rapid tram. Taking hydrogen fuel cells as the main on-board energy source, this system guarantees a long range for the trams, thanks to the characteristics of rapid power response of the lithium iron phosphate power batteries. A redundant energy system architecture of fuel cells is configured to meet the power demands of the entire trams without increasing space occupation on the tram roof, in addition to greatly extending their operating ranges. This paper also proposes a set of energy control strategies tailored to the operating conditions of autonomous-rail rapid tram, to ensure their smooth operation under various operating conditions and to control the state of charge (SOC) of the power batteries within the target range by combining the energy output form of the hybrid system with the characteristics of autonomous-rail rapid tram in the actual operating conditions. The results from the operation test conducted with real trams show that the hydrogen hybrid system and energy control strategies can meet the design requirements of hydrogen autonomous-rail rapid tram and the tram can reach a range of more than 300 km, a substantial increase from the previous 70 km, which demonstrates the proposed energy control strategies contribute to the improved operational ability and extended operating range in different operational scenarios, in addition to meeting requirements of various operating conditions.
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