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Description
China Southern Power Grid, Ltd. has established a project to study the feasibility of installing large-scale HTS dynamic synchronous condensers in Ultra High Voltage Direct Current (UHVDC) transmission grid. To investigate some key technologies, a small–scale one, such as 300-kvar class HTS synchronous condenser prototype is designed. The electromagnetic and structure design of this prototype is described in this manuscript. The rotor excitation winding, composed of totally 8 double-pancake racetrack coils, are wound by ReBCO coated conductors. It is cooled by forced-flow helium gas, and the working temperature is expected below 30 K. The water-cooled stator winding is embedded in non-ferromagnetic stator teeth. Made by fibre glass epoxy, the torque tubes are optimized to balance the thermal leak and mechanical requirement. The pair of copper (OHFC) current leads are designed to transport current from room temperature to cold terminals which are conduction cooled to below 30 K. All the rotor structures are enclosed in a vacuum chamber. Before assembling, the critical current of the rotor magnets are tested in liquid nitrogen temperature, and the test results shows the satisfactory with the design values.
