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how can I overcome on algebraic loop in simulink

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Rashed HD
Rashed HD 2020 年 3 月 26 日
コメント済み: ATHIRA E R 2020 年 6 月 13 日
I faced error in simulink when I use PV-block that located in renewable library which developed by mathworks team- with inverter (power electronic) with powergui block (discrete mode time =1e-6) and the PWM in the inverter (5Khz)
I tried to install memory block and unit delay block around the error area which is in ( PV Array/Diode Rsh/Product5 ) but it doesn't work still the same problem
I tried to minimize the sampling time in powergui from 1e-6 to 1e-8 , it works but it takes very very long time even if the simulation stop time is 0.1 unit time
if anybody can helps me .... please i'm trouble
  2 件のコメント
Rashed HD
Rashed HD 2020 年 3 月 30 日
yes the algebraic loop resolved but another error poped up which is the following
(
An error occurred while running the simulation and the simulation was terminated
Caused by:
  • Derivative of state '1' in block 'xxxxxx/PV three phase inverter/Mean/Model/integrator' at time 1.0 is not finite. The simulation will be stopped. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances) )

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採用された回答

Pemendra Kumar Pardhi
Pemendra Kumar Pardhi 2020 年 3 月 29 日
Dear,
Rashed,
Basialy algebric loop error occure in simulink model whenever zero is come in denomenator part of any function.
To ovecome the algebric loop error in simulink model due to -: PV Array/Diode Rsh/Product5.
follow two steps;
  1. Double click to PV array > advanced > check to check box in break algebric loop in internal model
  2. Go on the model configuration parameter model> zero crosing options > Zero-crossing control: Disable all
In this way your problem will be solved.
Thanks
Pemendra Kumar Pardhi
  1 件のコメント
Rashed HD
Rashed HD 2020 年 3 月 30 日
thanks for your help Mr.Pemendra Kumar Pardhi algebraic loop error has resolved
but i'm concern if that method will affect the model results quality ?
also, there is another error has poped up which is the following
(
An error occurred while running the simulation and the simulation was terminated
Caused by:
  • Derivative of state '1' in block 'xxxxxx/PV three phase inverter/Mean/Model/integrator' at time 1.0 is not finite. The simulation will be stopped. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances) )
please if you can help

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その他の回答 (1 件)

Divya Yerraguntla
Divya Yerraguntla 2020 年 3 月 31 日
Hi Rashed,
  1. This issue might occur when you are using the integrator block with 0 initial condition, try changing the initial condition to 0.0000001 instead.
  2. Else, you could also try changing the Solver to ODE15s (stiff/NDF) under the Type : Variable Step in the Model Configuration Parameters/Solver/Solver Options
Hope it helps!
  2 件のコメント
ATHIRA E R
ATHIRA E R 2020 年 6 月 13 日
Hi Sir,
I also followed the above steps and Im getting tha same error menioned above by RASHED MD. Can you help me to fix that error?

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