Algebraic loop error in PV panels (in filter block)
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Hello
I tried use PV array block from simulink to program MPPT. But I have a problem during simulation which is the algebraic loop in the filter block inside PV block.
Here's the error message I received
I also tried to put the unit delay block before the sum, but when I tried to simulate the system cannot find the filter block and could not run. I also tried to reduce the tolerance but it seems not working.
Any suggestion for me? Thank you so much
1 Kommentar
Naman Chaturvedi
am 27 Aug. 2018
I tried implementing the model and it worked fine for me. Can you please share your model or the inputs of the model.
Antworten (1)
Gert Kruger
am 28 Jun. 2019
The reason why there is an algebraic loop:
The V-Filter and I-Filter in the model, for the computation of Vd, is supposed to break the algbraic loop. Vd which is dependent on the model output is fed-back to the model inputs which would have caused an algebraic loop if the filters were not present. The presence of the algebraic loop indicates that the V-Filter and I-Filter implementation probably has an unintended direct feed-through at some point during the simulation.
Some suggest to add a unit delay, but this forces the model to be a mixed simulation problem, even if the rest of the model consist out of continuous state models. Secondly, what is an appropriate sample time for the unit delay?
Download a PV panel model with the algebraic loop fixed at:
The proposed solution has been tested.
Kind regards,
Gert
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