I am using a Three Phase Transformer (Two Windings) from the Simscape - Electrical - Specialized Power Systems - Fundamental Blocks - Elements library. Under the configuration tab, I have selected Yn:Yn implemented as three single-phase transfomers. I have selected to simulate saturation. Under the Advanced tab, you are allowed to either check "Break algebraic loop" or to leave unchecked and select the "Discrete solver model". With the default setings where "Break Algebraic loop in discrete saturation model" is unchecked and the "Discrete solver model" is set to "Trapezoidal Iterative", I can apply these settings, close the dialog box and compile the model without any problems. I can also check the "Break Algebraic loop in discrete saturation model", apply settings and compile the model without any problems. However, if I try to uncheck "Break Algebraic loop in discrete saturation model" and set the "Discrete solver model" to "Backward Euler robust, and at least the first time I can apply the settings and close the dialog box. However, when I then go to compile the model I get the following Simulink warnings: "Failed to find 'sps3phSaturableTransformerModel/Discrete_DSS' in library 'sps3phSaturableTransformerModel' referenced by ...... "Incorrect to comment or uncomment " [referencing block name] " : during callback execution." And the following error: "Error in ' [ referencing block name ] ' : Initializing commands cannot be evaluated." Next time I open the transformer block, when I try to apply settings I get the following message: "Error in " [ referencing block name ] ' : Initialization commands cannot be evaluated. Caused by: Reference block does not have a parameter named 'Variant'"

Cannot adjust discrete solver method for saturable transformer

mariko shirazi

8 Nov 2021

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Mise à jour 10 Nov 2021

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I am using a Three Phase Transformer (Two Windings) from the Simscape - Electrical - Specialized Power Systems - Fundamental Blocks - Elements library.

Under the configuration tab, I have selected Yn:Yn implemented as three single-phase transfomers. I have selected to simulate saturation. Under the Advanced tab, you are allowed to either check "Break algebraic loop" or to leave unchecked and select the "Discrete solver model".

With the default setings where "Break Algebraic loop in discrete saturation model" is unchecked and the "Discrete solver model" is set to "Trapezoidal Iterative", I can apply these settings, close the dialog box and compile the model without any problems.
I can also check the "Break Algebraic loop in discrete saturation model", apply settings and compile the model without any problems.
However, if I try to uncheck "Break Algebraic loop in discrete saturation model" and set the "Discrete solver model" to "Backward Euler robust, and at least the first time I can apply the settings and close the dialog box. However, when I then go to compile the model I get the following Simulink warnings:

"Failed to find 'sps3phSaturableTransformerModel/Discrete_DSS' in library 'sps3phSaturableTransformerModel' referenced by ......

"Incorrect to comment or uncomment " [referencing block name] " : during callback execution."

And the following error:

"Error in ' [ referencing block name ] ' : Initializing commands cannot be evaluated."

Next time I open the transformer block, when I try to apply settings I get the following message:

"Error in " [ referencing block name ] ' : Initialization commands cannot be evaluated. Caused by: Reference block does not have a parameter named 'Variant'"