Is it possible to excite an induction generator with a modified sine inverter?
Is it possible to excite a standalone induction generator (run by an engine) with a modified sine inverter(around 500 watts) similar to the grid-tie method?
Thank you in advance.
The term “modified sine inverter” probably means an inverter designed to convert a 12 volt DC input to 120 or 240 volts AC. I believe that the terms “modified sine inverter” and “sine wave inverter” are advertising terms coined by the manufacturer of an inverter that has a more truly sinusoidal output waveform to distinguish the product from inverters that have a waveform that is not as good. For use with an induction generator, other factors are more important than the quality of the waveform.
A 120 or 240 volt induction generator would tend to produce around 150 or 300 volts DC on the DC side of the inverter. With the type of inverter that you seem to be asking about, the method used to produce 120 or 240 volts AC from a 12 volt DC source is probably not compatible with a load that supplies power back into the inverter. The inverter itself may not have little or no capability to accept power flow in the opposite direction. Even if there is very little net real power flow back to the inverter, the reactive power flow required to excite the induction generator needs to be handled by the inverter.
In addition, the inverter requires a frequency control scheme that will keep the synchronous speed of the generator below the operating speed by the amount required to cause the generator to produce the current demanded by the load. The control scheme and the inverter must also be designed to get the induction generator started.
Converting an inverter designed for some other purpose to control an induction generator would not be an easy task. If such a thing were to be done, it would probably be best to start with a motor control inverter more commonly known as a variable frequency drive.
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