TAILIEUCHUNG - Wind Energy Management Part 9

Tham khảo tài liệu 'wind energy management part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Superconducting Devices in Wind Farm 95 necessary can be 5 - 10 for the size and weight optimization in both of the generator and the gear system. The HTS generator used here is hybrid structured as widely suggested . its rotor is made of HTS materials and the stator is conventional. Fig. 8 shows a schematic diagram of the hybrid structured HTS generator. It consists of the HTS rotor supported by torsion transmitting tubes and sealed in a cryostat often called Dewar in scientific reports and a conventional stator. For the convenience of connecting to the grid the output voltage of the system V is often selected as the common values used in the substations for example kV and 35 kV in China. Similarly the output of the system is usually in 3 phases the same as that in power grid. Thus for designed capacity P the output current I V. Rotor Dewar Excitation Power Supply HTS Coils A 3 or More Phases 8 - 10 Hz 3-phase 50 60 Hz HTS Generator Simple Optional Gear System Wheel Blades 8-12 rpm AC -DC -AC Convertor Cooling System Fig. 7. The schematic diagram of a HTS generator system. Fig. 8. The schematic diagram of the hybrid structured HTS generator. Labels in the figure 1 Stator iron core 2 Stator coil 3 HTS rotor coil 4 Rotor Dewar 5 Torsion transmitting tube 6 Driving shaft 7 Supporting tube 8 Axial tube for cooling and current transition. 96 Wind Energy Management However adjusted by converter and transformer the number of phases in the generator as well as the generator output voltage Vg and the stator phase current Ig are not necessarily the same as those of the system and can be optimized in generator electromagnetic design. It is note worthy that adopting an AC - DC - AC converter between the generator and the transformer the output frequency of the generator fg can also be adjusted. It is usually very low although the system output frequency f is commonly 50 or 60 Hz according to the grid standards. This is advantageous because the number of .

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