Simulation and experiment of a YBCO SMES prototype in voltage sag compensation

This paper gives a introduction of a SMES unit using 2G HTS wires. A complete SMES system including both superconducting coils and control circuit has been designed to operate at 77 K. Three single-phase H-bridge converters have been used in the control circuit. A loop control signal is sent out by using 32 fixed point Digital Signal Processor (DSP). The complete circuit has been both modelled in simulation and built experimentally. The results validate that this SMES successfully compensates a voltage sag in a power system.

Research highlights
► YBCO conductors are used in SMES.
► The SMES is successfully used to compensate voltage sag by both simulation and experiment.
► A new control strategy for the power converter in the SMES.