power system circuit cannot converge during fault simulation

Attached file has a simple circuit to simulate a fault at the secondary side of a transformer but it doesn't work. Same circuit works well in PSCAD.

note: in PSCAD the transformer data is :

Lossses (Shirt circuit test) = 0.0002 pu and

positive seq. leakage reactance = 0.15 pu

in SIMULINK , the trasnformer model has the option to enter the above values per side so:

primary leakage reactange =0.075pu

secundary leakage reactange =0.075pu

the erro a get is :

Error:An error occurred during simulation and the simulation was terminated

Caused by:

['IIF_VERIFICATION/Solver Configuration']: Transient initialization at time 0.1000000000000004, solving for consistent states and modes, failed to converge.

Nonlinear solver: failed to converge, residual norm too large.

Problems possible for transient initialization, as well as stepsize control for transient solve, due to equations of one or more components:

all components involved

'IIF_VERIFICATION/Fault (Three-Phase)'

Equation locations are:

'C:\Program Files\MATLAB\R2024b\toolbox\physmod\elec\library\m\+ee\+utilities\+faults\abc.sscp' (no line number info)

'C:\Program Files\MATLAB\R2024b\toolbox\physmod\elec\library\m\+ee\+utilities\+faults\abc.sscp' (no line number info)

'C:\Program Files\MATLAB\R2024b\toolbox\physmod\elec\library\m\+ee\+utilities\+faults\abc.sscp' (no line number info)

'IIF_VERIFICATION/RLC (Three-Phase)'

Equation location is:

'C:\Program Files\MATLAB\R2024b\toolbox\physmod\elec\library\m\+ee\+passive\+rlc_assemblies\+rlc\rlc.sscp' (no line number info)

'IIF_VERIFICATION/Two-Winding Transformer (Three-Phase)'

Equation location is:

'C:\Program Files\MATLAB\R2024b\toolbox\physmod\elec\library\m\+ee\+passive\winding.sscp' (no line number info)

Here is the set of components with unconverged equations:

'IIF_VERIFICATION/RLC (Three-Phase)'

Equation location is:

'ee.passive.rlc_assemblies.rlc.rlc'(no line number info)

Equation location is:

'ee.passive.rlc_assemblies.rlc.rlc'(no line number info)

'IIF_VERIFICATION/RLC (Three-Phase)'

Equation location is:

'ee.passive.rlc_assemblies.rlc.rlc'(no line number info)

Equation location is:

'ee.passive.rlc_assemblies.rlc.rlc'(no line number info)

'IIF_VERIFICATION/RLC (Three-Phase)'

Equation location is:

'ee.passive.rlc_assemblies.rlc.rlc'(no line number info)

Equation location is:

'ee.passive.rlc_assemblies.rlc.rlc'(no line number info)

'IIF_VERIFICATION/Two-Winding Transformer (Three-Phase)'

Equation location is:

'ee.passive.winding'(no line number info)

Equation location is:

'ee.passive.winding'(no line number info)

Equation location is:

'ee.passive.winding'(no line number info)

'IIF_VERIFICATION/Two-Winding Transformer (Three-Phase)'

Equation location is:

'ee.passive.winding'(no line number info)

Equation location is:

'ee.passive.winding'(no line number info)

Equation location is:

'ee.passive.winding'(no line number info)

Answer 1

[Ismael]

Found the issue myself.

There is a default value of ZERO for the parallel conductance. I change this value to be 1/1e-6, and now the circuit works.