In a SMES, the magnetic induction B is generated by a permanent
current which circulate in the superconducting short-cut coil. The
energy volumic density associated to such a setup (B/2µ
0) can be rapidely given back. This corresponds
to very high power. The great advantages are its excellent rendement,
its very high answer time and its quasi infinite cyclability.
In so doing, the system can be divided in 3 regimes
:
- the charge phase : the voltage is applied to the coil and the
current increase up to its expected value
- the storage phase : the coil is short-cut and the superconducting
current occurs in the coil
- the discharge phase : the energy is given back to the net via
a current-voltage convertissor.
A priori, the injection/retirement(?) power can be based on two different
principles :