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.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/148246/image.png)
Instead of using fixed loads, I´m using three phase dynamic load with external control as show in figure 2.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/148247/image.png)
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.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/148248/image.png)
Can anyone explain to me what is going on with the model and how to fix it ?
Sincerely, Andre Nudel
1 Kommentar
Atieh Delavari
am 26 Aug. 2015
Bearbeitet: Atieh Delavari
am 26 Aug. 2015
Hi I think you should adjust configuration parameters to see better waves forms
Antworten (2)
Sebastian Castro
am 24 Mär. 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
am 24 Mär. 2015
5 Kommentare
jun
am 26 Jun. 2024
Hello, I recently encountered a similar issue and found that the aforementioned method did not solve the problem. I added a three-phase circuit breaker in front of the Three-Phase Dynamic Load. After opening the circuit breaker, there was still significant voltage fluctuation at the front end of the breaker. I set the line voltage to 400V, but the actual voltage exceeded 100,000V. I found that the issue does not occur when no active and reactive power parameters are input for the load.
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