How to solve algebraic loop error??
169 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
Vidya
il 23 Nov 2012
Commentato: Zachary Naidoo
il 14 Apr 2022
Hii....I came across this error while making a model..
Simulink cannot solve the algebraic loop containing 'trial_3/PV panel/PV module' at time 0.0 using the TrustRegion-based algorithm due to one of the following reasons: the model is ill-defined i.e., the system equations do not have a solution; or the nonlinear equation solver failed to converge due to numerical issues. To rule out solver convergence as the cause of this error, either a) switch to LineSearch-based algorithm using set_param('trial_3','AlgebraicLoopSolver','LineSearch') b) reducing the VariableStepDiscrete solver RelTol parameter so that the solver takes smaller time steps. If the error persists in spite of the above changes, then the model is likely ill-defined and requires modification.
I am using coding to make photovoltaic panel and MPPT P&O algorithm.
Please help me to solve this error.
4 Commenti
Jim Riggs
il 2 Dic 2019
It's true that you can break algebraic loops using a unit delay as Azzi Abdelmalek says, but judging by the comments, people are not reviewing the link provided by Walter Roberson, below. This article contains some important information and considerations on the effect of using a unit delay and provides an alternative solution.
Malaiyappan M
il 17 Ago 2020
in MPPT Buck/Boost Converer try adjust the Inductor Value to resolve this error
Risposta accettata
Azzi Abdelmalek
il 23 Nov 2012
Modificato: Azzi Abdelmalek
il 23 Nov 2012
Algebraic loop occurs often, when you have a feedback through a constant block or equivalent, which means your signal y(t0)=constant * y(t0) , you should have y(t0+1)=constant*y(t0) which you can get with a unit delay block
15 Commenti
NING XUE
il 10 Mar 2020
Simulink cannot solve the algebraic loop containing 'partial_shading_conditions2/PV_SERIES2/Subsystem/Divide2' at time 0.039814999999999996 using the LineSearch-based algorithm due to one of the following reasons: the model is ill-defined i.e., the system equations do not have a solution; or the nonlinear equation solver failed to converge due to numerical issues. To rule out solver convergence as the cause of this error, either a) switch to TrustRegion-based algorithm using set_param('partial_shading_conditions2','AlgebraicLoopSolver','TrustRegion') b) reducing the VariableStepDiscrete solver RelTol parameter so that the solver takes smaller time steps. If the error persists in spite of the above changes, then the model is likely ill-defined and requires modification.
The same issue,but I have place the unit delay before the feedback,can't solve this problem
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/276219/image.png)
can you help me?
Più risposte (5)
Ahmed
il 19 Giu 2019
I've faced the same problem before, it can be solved by adding a unit delay block and type "set_param('trial_3','AlgebraicLoopSolver','LineSearch') " in the command prombit window of MATLAB.
2 Commenti
Akash maheshwari
il 3 Ott 2019
can you pleasse explain set_param('trial_3','AlgebraicLoopSolver','LineSearch'). i did that in my matlab command window but window show me that algebraic loop parameter did not found.
Gert Kruger
il 27 Giu 2019
PV panel model with fixed algebraic loop: https://www.mathworks.com/matlabcentral/fileexchange/71682-pv-array-with-algebraic-loop-broken
2 Commenti
ayachi amor
il 14 Giu 2021
Click on the PV panel itself, go to ' Advanced', then click on 'Break algebaic loop in internal model'.
hope to be solved.
1 Commento
Zachary Naidoo
il 14 Apr 2022
Hi, I have tried this by my displays for voltage and current show nan when for this. However if I don't click it then it displays the result with an error
Vedere anche
Prodotti
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!