Q.L.A 3 phase 6pole induction generator has rating of 800 KW. The stator is connected to 60 Hz line and rotor winding is connected to variable frequency converter that produces a frequency of 24 Hz from 60 Hz supply. The machine is operating at Sub synchronous speed and the wind turbine develops 500hp .The wind turbine is connected to the rotor by way of speed racing gearbox. Following information is also given 1. Gearbox and other friction losses Pf-11KW 2. ROTOR CU losses Pcu(rotor)-3KW 3. Status u losses Pcu(stator)=12KW 4. Converter losses p converter-2KW 5. Stator core losses Pi=7KW CO2 Find (i) sub synchronous speed (ii) Pd developed mechanical power (iii) Pg electromagnetic power transfer from rotor to stator (iv) Tm mechanical torque at the input to rotor (v) Pe electric power absorbed by the converter from 60 Hz supply (vi) PI electric power delivered by stator to 60HZ supply line (vii) Pout and efficiency of the machine
Q.L.A 3 phase 6pole induction generator has rating of 800 KW. The stator is connected to 60 Hz line and rotor winding is connected to variable frequency converter that produces a frequency of 24 Hz from 60 Hz supply. The machine is operating at Sub synchronous speed and the wind turbine develops 500hp .The wind turbine is connected to the rotor by way of speed racing gearbox. Following information is also given 1. Gearbox and other friction losses Pf-11KW 2. ROTOR CU losses Pcu(rotor)-3KW 3. Status u losses Pcu(stator)=12KW 4. Converter losses p converter-2KW 5. Stator core losses Pi=7KW CO2 Find (i) sub synchronous speed (ii) Pd developed mechanical power (iii) Pg electromagnetic power transfer from rotor to stator (iv) Tm mechanical torque at the input to rotor (v) Pe electric power absorbed by the converter from 60 Hz supply (vi) PI electric power delivered by stator to 60HZ supply line (vii) Pout and efficiency of the machine
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