2002 Volume 37 Issue 3 Pages 114-121
A cost reduction study of 100MW/15kWh SMES for power system stabilization and 100MW/500kWh SMES for fluctuating load compensation and frequency control is performed. The optimization of SMES capacity factors and rated magnetic fields for each system shows that the optimum capacity factor of 100MW/15kWh SMES is lower than that of 100MW/500kWh SMES. And the optimum magnetic field at the point of minimum cost is about 3T, lower than that of usual NbTi magnets. A multipole solenoid system with NbTi CIC conductor is proposed as a cost-reduced SMES system. To reduce the number of superconducting strands, the copper stabilizer segregated from the strand, and a strand cross-section structure is simplified from the first-phase SMES project design for cost reduction. To reduce long-term AC loss, the strand has a CuNi sheath, and cables are twisted up to the second degree, which is much lower than that of the cable designed for the first-phase SMES coil.
