.TransiEnt.Storage.Electrical.FlywheelStorage_L2

Information

1. Purpose of model

Model of an electric storage device based on flywheel technology.

2. Level of detail, physical effects considered, and physical insight

Physical representation of losses due to bearing and aerodynamic friction.

3. Limits of validity

Wear-out of component is not taken into account. This model has ideal reaction speeds.

4. Interfaces

There is only one electric port. Power input/output is regulated by grid frequency.

5. Nomenclature

(no elements)

6. Governing Equations

E=1/2*J*w^2

P_max = w*M_max

P=(f-f_n)*k

w_min<w<w_max

Losses:

Bearing losses proportional to w:

P_loss_bearing=a*w

Aerodynamic losses proportional to w^3:

P_loss_aerodynamic = b *w^3

Losses due to support system constant:

P_loss_support=const

7. Remarks for Usage

The flywheel will need the power to sustain its rotational speed when empty. Otherwise the simulation will fail.

8. Validation

Values for eta_max and self discharge rate compared to specification sheets. Thus, the loss factors a and b can be assumed to be in the right order of magnitude for the referenced system.

9. References

[1]Beacon power, LLS, URL: http://beaconpower.com/

10. Version History

Model created by Arne Koeppen (arne.koeppen@tuhh.de), Jul 2013

Edited by Lisa Andresen (andresen@tuhh.de) Aug 2013