Three Phase dynamic load
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Guys:
I´m an electric engineering student and I´m trying to create a IEEE-33 distribuion line topology with simulink as shown in figure 1. Source voltage is 138Kv and transformer reduces to 13.8 Kv.
Instead of using fixed loads, I´m using three phase dynamic load with external control as show in figure 2.
I´m facing a problem with with a very small model with three loads. Voltages and currents that are associated to these load models as show in figure 3 have strange behaviours. Results are like numeric noise. I was suspecting that the problem could be related with solve model but I tried fixed step and variable step with the same results.
Can anyone explain to me what is going on with the model and how to fix it ?
Sincerely, Andre Nudel
1 commentaire
Atieh Delavari
le 26 Août 2015
Modifié(e) : Atieh Delavari
le 26 Août 2015
Hi I think you should adjust configuration parameters to see better waves forms
Réponses (2)
Sebastian Castro
le 24 Mar 2015
It could very well be numerical noise. I noticed you are still using the ode45 solver, which is the default for Simulink.
If you open up Model Configuration Parameters, and go to the Solver pane, try:
- Change the solver to "ode23tb"
- Change the Relative Tolerance parameter from "auto" to "1e-4"
Both of these constitute the recommended settings for SimPowerSystems models, as shown in the power_new function.
If you still get noise, try further reducing the Relative Tolerance and Absolute Tolerance parameters, as well as the Max step size. This may help further.
- Sebastian
andre albagli
le 24 Mar 2015
3 commentaires
Mohammed Masum Siraj Khan
le 4 Oct 2019
Please add a small sized resistive load at the same node of the dynamic load (show in figure), as "the dynamic load is a nonlinear model simulated by current sources, it cannot be connected to an inductive network (R-L in series)", and it creates distortion in voltage, and current. I think that this will solve your problem.
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