Abstract
An MgB2 race track coil intended for demonstrating a down scaled pole of a 10 MW direct drive wind turbine generator has been designed. The coil consists of 10 double pancake coils stacked into a race track coil with a cross section of 84 mm × 80 mm. The length of the straight section is 0.5 m and the diameter of the end sections is 0.3 m. Expanded to a straight section of 3.1 m it will produce about 1.5 T magnetic flux density in the air gap of the 10 MW 32 pole generator and about 3.0 T at the edge of the superconducting coil with an operation current density of the coil of 70 A/mm2.
Highlights
Offshore wind power demands large turbines to drive down the cost of energy
The cost per capacity of the direct drive generator should be below 20% of the total offshore turbine cost of 1.5 M€/ to be competitive with the gearbox solution
We have designed an MgB2 race track coil intended for demonstration of a pole of a 10 MW direct drive wind turbine generator
Summary
Offshore wind power demands large turbines to drive down the cost of energy In this respect, superconducting direct drive generators may be advantageous due to a better size scaling compared to permanent magnet technology for ratings above 10 MW [1]. Several superconductors are considered for use in the generator rotor, e.g. high-temperature superconducting (HTS) YBCO tapes (coated conductors) [2] and low-temperature superconducting (LTS) NbTi [3]. The up-scaling to single piece lengths in the order of km is easier than for the coated conductors. This makes MgB2 wires and tapes candidates for the field coils of wind turbine generators, the large scale and in-field performance of the MgB2 technology still needs verification.
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