DC-DC converter Error Initial conditions solve failed to converge.

Question

Guanwei Zeng 2021-3-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/775152-dc-dc-converter-error-initial-conditions-solve-failed-to-converge

回答： Jasaswini Mohanty 2021-8-27

Hi, I'm quite new to Simulink and want to test the function of DC-DC converter. The picture below is the model I developed.

However, I came across these error:

Could anyone tell me how to solve this? Thanks in advance.

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Guanwei Zeng 2021-3-17

After I connected a electrical reference to the 2- port

the errors became these.

=== Simulation (Elapsed: 6 sec) ===

Warning:First solve for initial conditions failed to converge. Trying again with all high priorities relaxed to low.

Warning:Second solve for initial conditions failed to converge. Trying again with all variable targets ignored.

Error:An error occurred while running the simulation and the simulation was terminated

Caused by:

['untitled/Solver Configuration']: Initial conditions solve failed to converge.

Here is the set of components with unconverged equations:

'untitled/DC-DC Converter'

Equation location is:

'C:\Matlab\toolbox\physmod\elec\library\m\+ee\+semiconductors\+converters\dc_dc_converter.sscp'(no line number info)

Equation location is:

'C:\Matlab\toolbox\physmod\elec\library\m\+ee\+semiconductors\+converters\dc_dc_converter.sscp'(no line number info)

Equation location is:

'C:\Matlab\toolbox\physmod\elec\library\m\+ee\+semiconductors\+converters\dc_dc_converter.sscp'(no line number info)

Equation location is:

'C:\Matlab\toolbox\physmod\elec\library\m\+ee\+semiconductors\+converters\dc_dc_converter.sscp'(no line number info)

Equation location is:

'C:\Matlab\toolbox\physmod\elec\library\m\+ee\+semiconductors\+converters\dc_dc_converter.sscp'(no line number info)

'untitled/Battery'

Equation location is:

'C:\Matlab\toolbox\physmod\elec\library\m\+ee\+sources\battery.sscp'(no line number info)

Equation location is:

'C:\Matlab\toolbox\physmod\elec\library\m\+ee\+sources\battery.sscp'(no line number info)

'untitled/DC-DC Converter'

Equation location is:

'C:\Matlab\toolbox\physmod\elec\library\m\+ee\+semiconductors\+converters\dc_dc_converter.sscp'(no line number info)

Equation location is:

'C:\Matlab\toolbox\physmod\elec\library\m\+ee\+semiconductors\+converters\dc_dc_converter.sscp'(no line number info)

Equation location is:

'C:\Matlab\toolbox\physmod\elec\library\m\+ee\+semiconductors\+converters\dc_dc_converter.sscp'(no line number info)

Joel Van Sickel 2021-3-23

Hello,

you can start by putting a capacitor at the output of the dc/dc converter. You can set this to the appropriate output voltage initial condition in the variables tab.

Also, if it helpes, there is a free simscape onramp here: https://www.mathworks.com/learn/tutorials/simscape-onramp.html

Regards,

Joel

Vinay Gurram 2021-6-22

Hi

Can you check setting the priority of parameter from any block to low going to its variable tab.

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Answer 1

Joel Van Sickel 2021-7-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/775152-dc-dc-converter-error-initial-conditions-solve-failed-to-converge#answer_738578

you need to add an electrical reference to the output of this converter the way it works. (or short the output and input negative termals, or connect them with a large resistance to emulate isolation)

Regards,

Joel

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Answer 2

Jasaswini Mohanty 2021-8-27

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/775152-dc-dc-converter-error-initial-conditions-solve-failed-to-converge#answer_775429

Hi, I was facing a similar issue. Can you please try with local solver. open the f(x)=0 block and there you will see an option for local solver. check that box. Also, try with different solver options. Hope this helps.