Help me understand this warning message
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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
1 个评论
Walter Roberson
2011-7-14
Please do not create new Questions to "bump" existing topics. Duplication of questions results mostly in duplication of efforts.
回答（4 个）
Laura Proctor
2011-7-7
0 个投票
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.
Kaustubha Govind
2011-7-7
0 个投票
Nuno
2011-7-8
0 个投票
2 个评论
Kaustubha Govind
2011-7-8
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
2011-7-8
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."
Nuno
2011-7-12
0 个投票
4 个评论
Arnaud Miege
2011-7-12
Use a transfer function with appropriately chosen coefficients
Nuno
2011-7-12
Arnaud Miege
2011-7-15
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
2011-7-18
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