Power converter for SMES by use of ICB energy transfer circuit

Inverter-Converter Bridge (ICB) energy transfer circuit consists of two pow er converters and the capacitor bank, Two superconducting magnets are conne cted to the circuit and the stored energy is transfered by use of the circu it. The circuit has been mainly studied as an exciter circuit for pulse sup erconducting magnets because it enables to excite the large magnet quickly without affecting the utility, It is easy to achieve the required capacity because the circuit can be made by natural commutation thyristor, The circuit, which is connected to power system through the converter (util ity tie converter) has attractive features for SMES power converter, for in stance, wide control region of active and reactive power. The relation betw een utility tie converter control and the ICE circuit control is important for realizing SMES converter system, however, it has not been studied. In this paper, the magnet current control method concerned with utility tie converter has been discussed to control the energy flows. The theoretical analysis and the experimental results are shown.