IEEE Electrification Magazine - December 2013 - 16

A kinetic energystorage system is a
flywheel driven by an
electrical machine,
able to work as a
motor or a generator.

carbon fibers, which offer high levels of mechanical resistance and
low density. the elevated cost of the
wheel and the difficulty of manufacturing mean that its use is
restricted in general to applications
of limited energy in which the system price is not a critical issue.
table 1 shows that greater densities per mass unit are achieved using
compound materials (ideally carbon
fiber). however, if the concern is to
achieve energy per volume unit, metals such as steel can
be as effective as fibers and are much more economical.
table 2 displays some applications of these storage systems, classified by sectors.

description of the Technology
the flywheel developed for the railway application
[advance energy Storage Systems Project (Sa2Ve)] is made
of high-resistance forged steel, weighing 6 t and capable of

spinning at a speed of 6,500 r/min,
and it has an energy-storage capacity
of 200 MJ (55 kWh). the mechanical
part is also formed by conventional
ceramic bearings. Given the load on
the axle and the highly elevated rotation speed, a magnetic levitation system has been put in place using permanent magnets and an electromagnet to give regulation capacity,
reducing the stress on the axle and
therefore the sizing of the bearings.
the electrical machine, which serves for acceleration and
braking (depending on whether one wishes to store or
release energy), is a switched reluctance machine operating at 350 kW and that turns at the same speed as the
wheel. this machine is connected to the electrical network
through a series of power electronics equipment, which
are given the role of properly adapting voltage and frequency levels between the supply and the machine and
the network to which the system is connected. the control

(a)

(b)

(c)

(d)

Figure 3. The equipment associated with the flywheel energy storage at the ADIF's railway substation in Madrid, Spain. The (a) entrance to the security
pit at the ADIF substation, (b) power electronics converters, (c) the flywheel energy storage device, and (d) the control room. (Photos courtesy of ADIF.)

16

I E E E E l e c t r i f i c ati o n M agaz ine / december 2013



Table of Contents for the Digital Edition of IEEE Electrification Magazine - December 2013

IEEE Electrification Magazine - December 2013 - Cover1
IEEE Electrification Magazine - December 2013 - Cover2
IEEE Electrification Magazine - December 2013 - 1
IEEE Electrification Magazine - December 2013 - 2
IEEE Electrification Magazine - December 2013 - 3
IEEE Electrification Magazine - December 2013 - 4
IEEE Electrification Magazine - December 2013 - 5
IEEE Electrification Magazine - December 2013 - 6
IEEE Electrification Magazine - December 2013 - 7
IEEE Electrification Magazine - December 2013 - 8
IEEE Electrification Magazine - December 2013 - 9
IEEE Electrification Magazine - December 2013 - 10
IEEE Electrification Magazine - December 2013 - 11
IEEE Electrification Magazine - December 2013 - 12
IEEE Electrification Magazine - December 2013 - 13
IEEE Electrification Magazine - December 2013 - 14
IEEE Electrification Magazine - December 2013 - 15
IEEE Electrification Magazine - December 2013 - 16
IEEE Electrification Magazine - December 2013 - 17
IEEE Electrification Magazine - December 2013 - 18
IEEE Electrification Magazine - December 2013 - 19
IEEE Electrification Magazine - December 2013 - 20
IEEE Electrification Magazine - December 2013 - 21
IEEE Electrification Magazine - December 2013 - 22
IEEE Electrification Magazine - December 2013 - 23
IEEE Electrification Magazine - December 2013 - 24
IEEE Electrification Magazine - December 2013 - 25
IEEE Electrification Magazine - December 2013 - 26
IEEE Electrification Magazine - December 2013 - 27
IEEE Electrification Magazine - December 2013 - 28
IEEE Electrification Magazine - December 2013 - 29
IEEE Electrification Magazine - December 2013 - 30
IEEE Electrification Magazine - December 2013 - 31
IEEE Electrification Magazine - December 2013 - 32
IEEE Electrification Magazine - December 2013 - 33
IEEE Electrification Magazine - December 2013 - 34
IEEE Electrification Magazine - December 2013 - 35
IEEE Electrification Magazine - December 2013 - 36
IEEE Electrification Magazine - December 2013 - 37
IEEE Electrification Magazine - December 2013 - 38
IEEE Electrification Magazine - December 2013 - 39
IEEE Electrification Magazine - December 2013 - 40
IEEE Electrification Magazine - December 2013 - 41
IEEE Electrification Magazine - December 2013 - 42
IEEE Electrification Magazine - December 2013 - 43
IEEE Electrification Magazine - December 2013 - 44
IEEE Electrification Magazine - December 2013 - 45
IEEE Electrification Magazine - December 2013 - 46
IEEE Electrification Magazine - December 2013 - 47
IEEE Electrification Magazine - December 2013 - 48
IEEE Electrification Magazine - December 2013 - 49
IEEE Electrification Magazine - December 2013 - 50
IEEE Electrification Magazine - December 2013 - 51
IEEE Electrification Magazine - December 2013 - 52
IEEE Electrification Magazine - December 2013 - 53
IEEE Electrification Magazine - December 2013 - 54
IEEE Electrification Magazine - December 2013 - 55
IEEE Electrification Magazine - December 2013 - 56
IEEE Electrification Magazine - December 2013 - 57
IEEE Electrification Magazine - December 2013 - 58
IEEE Electrification Magazine - December 2013 - 59
IEEE Electrification Magazine - December 2013 - 60
IEEE Electrification Magazine - December 2013 - 61
IEEE Electrification Magazine - December 2013 - 62
IEEE Electrification Magazine - December 2013 - 63
IEEE Electrification Magazine - December 2013 - 64
IEEE Electrification Magazine - December 2013 - 65
IEEE Electrification Magazine - December 2013 - 66
IEEE Electrification Magazine - December 2013 - 67
IEEE Electrification Magazine - December 2013 - 68
IEEE Electrification Magazine - December 2013 - 69
IEEE Electrification Magazine - December 2013 - 70
IEEE Electrification Magazine - December 2013 - 71
IEEE Electrification Magazine - December 2013 - 72
IEEE Electrification Magazine - December 2013 - 73
IEEE Electrification Magazine - December 2013 - 74
IEEE Electrification Magazine - December 2013 - 75
IEEE Electrification Magazine - December 2013 - 76
IEEE Electrification Magazine - December 2013 - 77
IEEE Electrification Magazine - December 2013 - 78
IEEE Electrification Magazine - December 2013 - 79
IEEE Electrification Magazine - December 2013 - 80
IEEE Electrification Magazine - December 2013 - Cover3
IEEE Electrification Magazine - December 2013 - Cover4
https://www.nxtbook.com/nxtbooks/pes/electrification_december2022
https://www.nxtbook.com/nxtbooks/pes/electrification_september2022
https://www.nxtbook.com/nxtbooks/pes/electrification_june2022
https://www.nxtbook.com/nxtbooks/pes/electrification_march2022
https://www.nxtbook.com/nxtbooks/pes/electrification_december2021
https://www.nxtbook.com/nxtbooks/pes/electrification_september2021
https://www.nxtbook.com/nxtbooks/pes/electrification_june2021
https://www.nxtbook.com/nxtbooks/pes/electrification_march2021
https://www.nxtbook.com/nxtbooks/pes/electrification_december2020
https://www.nxtbook.com/nxtbooks/pes/electrification_september2020
https://www.nxtbook.com/nxtbooks/pes/electrification_june2020
https://www.nxtbook.com/nxtbooks/pes/electrification_march2020
https://www.nxtbook.com/nxtbooks/pes/electrification_december2019
https://www.nxtbook.com/nxtbooks/pes/electrification_september2019
https://www.nxtbook.com/nxtbooks/pes/electrification_june2019
https://www.nxtbook.com/nxtbooks/pes/electrification_march2019
https://www.nxtbook.com/nxtbooks/pes/electrification_december2018
https://www.nxtbook.com/nxtbooks/pes/electrification_september2018
https://www.nxtbook.com/nxtbooks/pes/electrification_june2018
https://www.nxtbook.com/nxtbooks/pes/electrification_december2017
https://www.nxtbook.com/nxtbooks/pes/electrification_september2017
https://www.nxtbook.com/nxtbooks/pes/electrification_march2018
https://www.nxtbook.com/nxtbooks/pes/electrification_june2017
https://www.nxtbook.com/nxtbooks/pes/electrification_march2017
https://www.nxtbook.com/nxtbooks/pes/electrification_june2016
https://www.nxtbook.com/nxtbooks/pes/electrification_december2016
https://www.nxtbook.com/nxtbooks/pes/electrification_september2016
https://www.nxtbook.com/nxtbooks/pes/electrification_december2015
https://www.nxtbook.com/nxtbooks/pes/electrification_march2016
https://www.nxtbook.com/nxtbooks/pes/electrification_march2015
https://www.nxtbook.com/nxtbooks/pes/electrification_june2015
https://www.nxtbook.com/nxtbooks/pes/electrification_september2015
https://www.nxtbook.com/nxtbooks/pes/electrification_march2014
https://www.nxtbook.com/nxtbooks/pes/electrification_june2014
https://www.nxtbook.com/nxtbooks/pes/electrification_september2014
https://www.nxtbook.com/nxtbooks/pes/electrification_december2014
https://www.nxtbook.com/nxtbooks/pes/electrification_december2013
https://www.nxtbook.com/nxtbooks/pes/electrification_september2013
https://www.nxtbookmedia.com