Incorrect simulation results for flyback converter using Simpowersys

[thecake]

Hello :)

I have created a flyback converter model using Simpowersystems in Simulink/Matlab. But it always gives me the wrong answer! I have simulated the same system using PLECS and Simscape/simulink and got the correct answer. But with my Simpowersystems model, it always gives me the wrong answer here is a link to the model

https://www.dropbox.com/sh/6h6e219x65o6ldk/aKKEgl3Y_D

Any idea what is going on? I tried changing the solver but without luck

Here is a picture of the model

http://prntscr.com/2be8yk

 

[berkeman]

Hello :)

I have created a flyback converter model using Simpowersystems in Simulink/Matlab. But it always gives me the wrong answer! I have simulated the same system using PLECS and Simscape/simulink and got the correct answer. But with my Simpowersystems model, it always gives me the wrong answer here is a link to the model

https://www.dropbox.com/sh/6h6e219x65o6ldk/aKKEgl3Y_D

Any idea what is going on? I tried changing the solver but without luck

Here is a picture of the model

http://prntscr.com/2be8yk

The picture of the model looks wrong. D3 is in backwards and Cf is upside-down. D3 has to be reversed to give you a positive Vo.

 

[thecake]

The picture of the model looks wrong. D3 is in backwards and Cf is upside-down. D3 has to be reversed to give you a positive Vo.

That was intentional, I wanted to have a negative output voltage, that is why they are reversed :)

Here is what the output is supposed to look like in this configuration using another program

http://img703.imageshack.us/img703/355/cmgy.png

 

[berkeman]

That was intentional, I wanted to have a negative output voltage, that is why they are reversed :)

Here is what the output is supposed to look like in this configuration using another program

http://img703.imageshack.us/img703/355/cmgy.png

It's just pumping down the voltage without any feedback regulation working. Your feedback sensor element is upside down with respect to your "negative output voltage".

 

[alphy]

Hello,

Thank you for sharing your simulation results and model. It is important to understand that simulation results can vary depending on the simulation tool used, as each tool may have different algorithms and assumptions built into it. In this case, it seems that there may be a discrepancy between the results obtained from Simpowersystems and PLECS/Simscape.

One potential reason for this could be the different solver settings used in each simulation tool. I would recommend checking the solver settings in Simpowersystems and making sure they are consistent with the settings used in PLECS/Simscape. Also, make sure that the simulation time step is small enough to accurately capture the dynamics of the system.

Additionally, it would be helpful to validate the model by comparing it to analytical equations or experimental data. This can help identify any potential errors or discrepancies in the model itself.

I hope this helps. If the issue persists, I would recommend reaching out to the technical support team for Simpowersystems for further assistance. They may be able to provide more specific guidance based on your model and simulation settings.

Best of luck with your simulation.