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Wind Turbine
Thomas Grothe
Wind to Mechanical
• Pwind = (1/2)ρairAv3
• tip speed ratio = blade tip speed / wind speed• Optimal tip speed ratio when tw = ts (this is
when greatest possible amount of energy in the wind is used to rotate to rotor)
• ts = 2π/(nω) tw = x/v
Mechanical to AC
• Alternator uses induction to make 3-phase AC
AC to DC
• diode – allows current to go in only one direction
Battery
• apply a voltage that is higher than the battery’s output voltage
• charge controller puts extra current through something else
• industrial forklift batteries
120 V AC 60 Hz Output
• inverter – DC to AC
References
• http://www.windstuffnow.com/main/3_phase_basics
• http://www.otherpower.com/otherpower_wind.html
• http://www.scoraigwind.com/• A Wind Turbine Recipe Book – Hugh Piggott
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