Help me understand this warning message

Is this an important warning?

 Warning: Block diagram 'mesmotestesSoBatTerra' contains 1 algebraic loop(s). To see
more details about the loops use the command line Simulink debugger by typing "sldebug
mesmotestesSoBatTerra" in the MATLAB command window. To eliminate this message, set
the Algebraic loop option in the Diagnostics page of the Simulation Parameters Dialog
to "None" 
Found algebraic loop containing:
  'mesmotestesSoBatTerra/Subsystem/Simulink-PS Converter1/EVAL_KEY/SFUN'
  'mesmotestesSoBatTerra/Subsystem1/Solver Configuration/EVAL_KEY/SFUN' (discontinuity)
  'mesmotestesSoBatTerra/Subsystem/PS-Simulink Converter/EVAL_KEY/SFUN'
  'mesmotestesSoBatTerra/powergui/EquivalentModel1/State-Space' (discontinuity)
  'mesmotestesSoBatTerra/Subsystem/Voltage Measurement/do not delete this gain' (algebraic variable)
Warning: Discontinuities detected within algebraic loop(s), may have trouble solving

[Walter Roberson]

Please do not create new Questions to "bump" existing topics. Duplication of questions results mostly in duplication of efforts.

Answer 1

[Laura Proctor]

You have an algebraic loop in your diagram which will slow-down your computation time and may not converge to a solution. You can identify which loop it is by setting the Algebraic Loop option (Simulation --> Configuration Parameters --> Diagnostics) to ERROR.

Generally it is due to a feedback loop that contains a sequence of direct feedthrough blocks. This algebraic loop can often be modeled without using feedback, if you do the math.

Answer 2

[Kaustubha Govind]

See What are algebraic loops in Simulink and how do I solve them?

Answer 3

[Nuno]

My loop is this: http://img808.imageshack.us/img808/3449/loop.png

And said this: Block diagram 'mesmotestesSoBatTerra' contains an algebraic loop. The algebraic loop solver is disabled because of the current setting for Algebraic loop option in the Diagnostics page of the Configuration Parameters Dialog

Why i resolved this?

[Kaustubha Govind]

It's not clear what you question is. Please explain what you mean by "Why i resolved this?" - it doesn't seem like you have resolved the algebraic loops from the above message.

[Arnaud Miege]

Have a look at the answers and comments I gave to one of your previous questions:

http://www.mathworks.co.uk/matlabcentral/answers/9053-doubt-in-circuit-of-battery

I explain that interfacing Simscape to SimPowerSystems "will likely introduce an algebraic loop in your model, that you may need to break with, say, a low-pass filter (transfer function) with an appropriately chosen cut-off frequency."

Answer 4

[Nuno]

How i put the low-pass filter?

[Arnaud Miege]

Use a transfer function with appropriately chosen coefficients

[Nuno]

But how i chose coefficients?

[Arnaud Miege]

Use your engineering knowledge. What is the highest frequency component you'd expect? Set your cut-off frequency to be higher than that. Set a gain of 1.

http://en.wikipedia.org/wiki/Low-pass_filter#Laplace_notation

[Nuno]

But i don´t understand where i put a tranfer function?