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How to solve algebraic loop error??

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Vidya
Vidya 2012 年 11 月 23 日
コメント済み: Malaiyappan M 2020 年 8 月 17 日
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 件のコメント
Malaiyappan M
Malaiyappan M 2020 年 8 月 17 日
in MPPT Buck/Boost Converer try adjust the Inductor Value to resolve this error

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採用された回答

Azzi Abdelmalek
Azzi Abdelmalek 2012 年 11 月 23 日
編集済み: Azzi Abdelmalek 2012 年 11 月 23 日
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 件のコメント
NING XUE
NING XUE 2020 年 3 月 10 日
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
can you help me?

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その他の回答 (4 件)

Walter Roberson
Walter Roberson 2017 年 5 月 6 日
  1 件のコメント
Jim Riggs
Jim Riggs 2018 年 9 月 6 日
Good tip. Thanks.

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Kalyani Dhawad
Kalyani Dhawad 2018 年 9 月 6 日
I have same problem in pv system

Ahmed
Ahmed 2019 年 6 月 19 日
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 件のコメント
Akash maheshwari
Akash maheshwari 2019 年 10 月 3 日
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.

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Gert Kruger
Gert Kruger 2019 年 6 月 27 日
  2 件のコメント
Malaiyappan M
Malaiyappan M 2020 年 8 月 17 日
Inductor is not designed properly

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