Electrical Equipment - Wind Energy Systems for Electric Power Generation - page 75

Fig. 4.25 Concept of a CAES plant (Huntorf/Germany)

and still operated by E. On is the plant in Huntorf/Germany whose specification
serves here to indicate the system capability, see Table 4.2 [Crot01].
The overall efficiency is reported 54%; full power is available within 10 min.

Table 4.2 Main properties of CAES plant Huntorf
Output in turbine operation 290 MW for < = 3hrs

in compressor operation 60 MW for < = 12 hrs

Cavern pressure 43 bar (minimum) 70 bar (permissible)

Reduction rate 15 bar/h (maximum)

310000 m 3 Total cavern volume (2 caverns)

4.4.4.3 Flywheel Storage Devices

In flywheel energy storage (FES) use is made of the kinetic energy of a rotating
device which is:

E k = 1

2

2 J

Ω

where J is moment of inertia referred to the center of rotation, and is the angu-

lar velocity. In case of a rotating solid cylinder of mass m and radius R we have

Ω