scholarly journals Hybrid Power System for the Range Extension of Security Robots: Prototyping Phase

2021 ◽  
Vol 11 (24) ◽  
pp. 12095
Author(s):  
Woosuk Sung ◽  
Yong-Gu Park

This paper describes our best practices related to hybrid power system (HPS) development with a focus on the prototyping phase. Based on the main development goals of our security robot, 24 h continuous operation on a single charge as a top priority, the HPS specifications were developed in the previous phase. For long-duration missions, batteries are hybridized with hydrogen fuel cells. By hybridization, the practical issues of fuel cells can be addressed such as lack of durability and low power density. With the developed specifications of the HPS, its components were acquired and installed to build a prototype. Using an electronic load coupled with a charge-discharge system controller, the constructed prototype was tested, discovering the maximum output power (850 W) that the fuel cell can sustain for 24 h. To further increase the energy density of the HPS, its structure was converted to a plug-in hybrid. With the developed HPS simulator, the converted HPS was simulated, predicting an extended hours of operation (2.07 h) based on the larger battery (7S12P) over the widest SOC window (90%). The plug-in HPS prototype was integrated into the security robot. On a dedicated chassis dynamometer, the integrated prototype was tested, demonstrating its capability to continuously operate the security robot for 24 h.

2019 ◽  
Vol 43 (10) ◽  
pp. 5266-5283 ◽  
Author(s):  
Liyan Zhang ◽  
Jia Liu ◽  
Weiwei Qi ◽  
Qihong Chen ◽  
Rong Long ◽  
...  

Author(s):  
Hongliang Hao ◽  
Huisheng Zhang ◽  
Shilie Weng ◽  
Ming Su

Fuel cells have been revealed to be a very attractive power generation system, promising highly efficient electricity generation and very low environmental impact. The integration of micro turbines and high-temperature fuel cells has been proposed in recent years as an extremely efficient solution for power generation. A molten carbonate fuel cell / micro gas turbine (MCFC/MGT) hybrid power system has theoretically demonstrated that it can achieve higher thermal efficiency than other conventional power generation systems. To understand operation characteristics of the MCFC/MGT hybrid power system, it is essential to analyze influence of operating and design parameters on its performance. Based on an existing 50KW MCFC stack, a steady-state thermodynamic model for MCFC/MGT hybrid power system is developed on the IPSEpro simulation platform and applied to a performance analysis. The characteristics under off-design and design condition for hybrid power system were also analyzed.


2021 ◽  
Vol 11 (23) ◽  
pp. 11577
Author(s):  
Woosuk Sung

This paper describes our best practices related to hybrid power system (HPS) development, with a focus on the specification development phase. The HPS specifications are based on the main development goals of our security robot, which place top priority on 24 h continuous operation on a single charge. Similar to human guards, security robots are expected to operate 24 h per day, seven days per week, but existing battery-powered robots cannot meet these goals. For long-duration missions, their operating times are too short, and their charging times are too long. As an effective alternative, hydrogen fuel cells are combined with batteries to hybridize the power systems of security robots. In this study, several HPS structures were comprehensively compared by selecting a one-stage series structure. Component specifications were determined based on the selected structure to achieve the main development goals of our security robot. To verify whether the determined specifications are valid, a HPS simulator was developed. The key operating conditions for the HPS were simulated, including overloading, terminal short-circuiting, and drive cycling. Under critical conditions, the behavior of the entire system and its components was confirmed. The developed specifications will eventually be carried over to the prototyping phase.


2019 ◽  
Vol 139 (4) ◽  
pp. 259-268
Author(s):  
Effat Jahan ◽  
Md. Rifat Hazari ◽  
Mohammad Abdul Mannan ◽  
Atsushi Umemura ◽  
Rion Takahashi ◽  
...  

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