newbe
Joined: 16 Sep 2006
Posts: 1
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 Posted:
Sat Sep 16, 2006 7:38 am Post subject:
A regen inverter for small, grid connected wind turbine ? |
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Total newbe here desperately trying to get some info on the practicality of using an off the shelf four-quadrant inverter drive to: (1) Provide interconnection to the grid. (2) Provide optimal load to the induction motor (being used as the generator) as a function of frequency (or speed of the rotor).
I understand that a regen inverter (like its name implies) can put energy back on to the grid from its motor working as generator. With this premise I have some specific questions as to how this might be implemented on a small (5- 15kW) wind generator that is using an induction motor / gearbox coupled to a wind rotor.
The system would look something like this (I think)
A PLC would contain the optimum values of output current for every shaft speed (or frequency). If the current is greater than optimum for a given frequency because of a gust of wind the PLC would tell the drive to increase frequency in order to maintain (wind) rotor system efficiency. If the current is less the optimum value the PLC would slow the system down to the optimum current for that speed.
Maximum system speed would be controlled by centrifical actuation of the rotor blades causing them to pitch out of the wind.
I am making the assumption that the regen inverter working at a constant speed in generation mode would see an increase in input torque as an increase in output current …. Is this correct?
How fast can this cycle of measure, compare, and adjust happen?? .. .. ms?
Any advice is gratefully accepted.
Thank you
ssl
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