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FAQs: How can I model an Induction Generator in PTW?
Although PTW does not have a specific induction generator model (it only has a synchronous generator model), induction generators can be easily modelled. A synchronous generator has its own excitation system, whereas an induction generator takes its excitation by absorbing reactive power from the rest of the network. 
 
Running a load-flow study 
An induction generator should be modelled as a PQ generator when running a load-flow. The values should be set to absorb reactive power and produce active power. 
  • (Version V7.0 and earlier) A network must always have a swing-bus generator to run a study; this is not a problem because an induction generator will always be connected to an external source of reactive power.
  • (Version V8.0 onwards) There is no longer a requirement for a swing-bus generator 
 
Running a fault study 
As far as the Comprehensive Fault Study is concerned, there is no difference between an induction generator and a synchronous generator, so the standard model can be used. The IECFault study does, on the other hand, consider the excitation of machines. Unfortunately the IEC60909 and IEC61363 standards do not address the use of induction generators.  Therefore an induction generator cannot "officially" be modelled in IECFault. 
 
Running an I*SIM study 
The I*SIM module includes an induction generator as one of the standard generator models. Although its exact behaviour will depend on the network and the scenarios modelled, an induction generator will generally continue to operate until there is insufficient stored energy to continue.