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 个评论
Atieh Delavari
2015-8-26
编辑：Atieh Delavari
2015-8-26
Hi I think you should adjust configuration parameters to see better waves forms
回答（2 个）
Sebastian Castro
2015-3-24
0 个投票
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
2015-3-24
0 个投票
5 个评论
Sebastian Castro
2015-3-24
Hmm... I noticed your simulation is running in Discrete mode. Try either reducing the sample time or testing the model out in Continuous mode.
Another thing to try is use time invariant loads to see if the model works with those first.
andre albagli
2015-3-28
Mohammed Masum Siraj Khan
2019-10-4
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.
jun
2024-6-26
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.
jun
2024-6-26
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2015-3-23
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