Flywheel Energy Storage for Telecom Applications
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Energy storage at radio base stations is crucial in case of power failure. Short power disturbances are today generally secured by lead-acid batteries. In locations with unreliable grid supply, diesel generators are used for power backup. Flywheel energy storage is an efficient, environmentally friendly and sustainable solution to handle short power disturbances at base stations.
This Master of Science thesis, in collaboration with Ericsson, investigates the technology of flywheels, if and how the advantages of storing kinetic energy can be used in telecom applications. Power requirements ranging from 1 to 50 kW and a backup-time from five minutes up to two hours are included in this study. Products available on the market today offer high power output with a very short discharge time. A major question in this thesis is if it is possible to supply the load with a lower power for a longer time. Flywheel rotors of composite and magnetic levitation makes is possible to reduce standby and friction losses that traditionally have been a difficulty for the technology.
The main conclusion is that flywheels are an alternative solution for energy storage for telecom applications but there are however no products available on the market today. Conclusions of calculations and discussions with researchers are that flywheels have the potential to be feasible at locations requiring several discharge and recharge cycles per day, high power outputs and short backup times. Theoretical calculations show that higher energy contents than what the products offered today have is possible to achieve. Further development of the technology will most probably make flywheels available for a wider range of applications and capital costs will be lowered as the market grows.
Place, publisher, year, edition, pages
2012. , 67 p.
Flywheel, energy storage, composite, magnetic bearing, telecom
IdentifiersURN: urn:nbn:se:kth:diva-99048OAI: oai:DiVA.org:kth-99048DiVA: diva2:540895
Subject / course
Master of Science in Engineering - Mechanical Engineering
Hagström, Peter, Dr
Fransson, Torsten, Prof