scholarly journals Utility rate structures and distributed thermal energy storage: a cost/benefit analysis. Basic research report, October 1978-February 1979

1979 ◽  
Author(s):  
E.F. Koening ◽  
A.B. Cambel
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Basic Research ◽  
Research Report ◽  
Benefit Analysis ◽  
Utility Rate

Cost-benefit analysis for regenerative energy storage in metro

2017 ◽  
Vol 11 (1) ◽  
pp. 19-34 ◽  
Author(s):  
Xiang Li ◽  
Ziyou Gao
Keyword(s):  
Energy Storage ◽  
Recovery Rate ◽  
Energy Recovery ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Maintenance Cost ◽  
Benefit Analysis ◽  
Content Type ◽  
Storage Devices ◽  
Regenerative Energy

Purpose Regenerative braking is an efficient energy saving technology in urban rail system, in which the recovery energy from braking trains is collected by some equipments and released to accelerating trains when needed. However, the high cost and low lifetime of storage devices prevent the widespread use of this technology. The purpose of this paper is to conduct thorough cost-benefit analysis to facilitate China’s urban rail companies to make decisions on the use of such technology. Design/methodology/approach To evaluate the benefit from regenerative energy storage, the authors formulate an improved integrated scheduling and speed control model to calculate the net energy consumption associated with different energy recovery rates and then define the benefit as the amount of energy saving arising from the usage of storage equipments. With the frequent charge/discharge operations on storage equipments, the energy recovery rate generally decreases which lowers the benefit, but the maintenance cost increases. By trading-off benefit and cost, the authors derive the optimal scrapping time, the maximum profit and the profitability condition for storage devices. Findings Simulation studies based on the Beijing Metro Yizhuang Line of China are given. The results show that compared with the current timetable and speed profile, the integrated scheduling and speed control approach with energy recovery rate of 0.5 can reduce the net energy consumption by 12.69 per cent; the net energy consumption can be well approximated as a linear function of energy recovery rate; and the maximum profit and the optimal scrapping time on regenerative energy storage devices are both positively related to the electricity price. The allowance proportion and the number of service trains such that busy lines with higher electricity price or allowance proportion have advantages to use the regenerative energy storage devices. Research limitations/implications In this work, a linear energy recovery rate and a linear maintenance cost are used in the cost-benefit analysis process. In future research, the more accurate expressions on energy recovery rate and maintenance cost should be considered if more data on recovery rate and maintenance cost can be gathered. Originality/value The main values of this paper are to develop the integrated optimization approaches for train scheduling and speed control and, on this basis, make thorough cost-benefit analysis for regenerative energy storage to improve the operations management of urban rail transit.

Sign in / Sign up

Export Citation Format

Share Document