A proposal of a cost-reduced SMES system multipole solenoid system with NbTi CIC conductor

摘要

A cost reduction study of 100 MW/15 kWh SMES for power system stabilization and 100 MW/500 kWh 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 100 MW/15 kWh SMES is lower than that of 100 MW/500 kWh SMES. And the optimum magnetic field at the point of minimum cost is about 3 T, 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 cable are twisted up to the second degree, which is much lower than that of the cable designed for the first-phase SMES coil.