WT-5. Small high-speed WT

Given:

• rated propeller speed - 200 rpm
• torque – 1 kNm
• WT height – 30 m,
• Distance from the tower to the power house – 50 m
• Transformer with 400 V is available the power house – 50 m

The task: design optimal systems for the following drive trains configurations:

• without gear (DD),
• with 1-stage gearbox,
• with 2-stage gearbox,
• with 3-stage gearbox.

Draw conclusions on efficiency vs cost. First take only induction machine and try different efficiency classes. Design for highest efficiency. Limit CAPEX (capital expenditures) to 30000 Euro.