Trouble solving algebraic equations in differential-algebraic system. Can anybody help me with this?

I got this error when I tried to simulate the curcuit.: An error occurred while running the simulation and the simulation was terminated Caused by: Trouble solving algebraic equations in differential-algebraic system. Singular iteration matrix encountered with step size 2.5546953107617278E-28 at time 0.0. Consider providing more accurate initial conditions. If the problem persists, check the model structure and values of parameters.

It works when i'm changing lowest '+' sign to '-' in the lowest summation box in the scheme. It is desirable to have a '+' sign instead of a '-' sign. Can anybody help me with this?

Answer 1

[Suhan]

Hi,

Your model may have some algebraic loops. One of the algebraic loops that I can see in your model is feedback signal from "voltage sensor" block to summation block, and there are a few more. Please refer to the following page to know more about algebraic loops and ways to resolve it: https://in.mathworks.com/help/simulink/ug/algebraic-loops.html