Simulink Switch blocks incompatible with Simscape Specialized Power Systems

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Maurício Pires
Maurício Pires 2020-6-30
评论： Maurício Pires 2020-7-6
I'm facing a problem of incompatibility between the blocks from Simulink Simscape and Simscape Specialized Power Systems blocks. I need a simple switch that work with the Asynchronous Machine block from Specialized Power Systems. It would also be nice to have a Phase Permute block compatible with Specialized Power Systems. I have to use this Asynchronous Machine block instead of the other Induction Machine blocks available because I need information about the current in the rotor's resistor and this is the only model I found that provides this information. None of the switch blocks I found are compatible with this library (Specialized Power Systems). Is there any? How can I solve this? Thank you

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Vasco Lenzi
Vasco Lenzi 2020-7-1
Hi Mauricio
for simple switch do you mean like a breaker or more of a semiconductor device driven by PWM? Which release?
Since 2006a, there is an Ideal Switch in the Fundamental Blocks -> Power Electronics library, and a breaker in the Fundamental Blocks -> Elements library:
Regarding a phase permuter, you can easily create one and create your own block in your own library to be reused:
Here how to create a custom library:
https://www.mathworks.com/help/simulink/ug/creating-block-libraries.html
Hope this helps!
Vasco
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Vasco Lenzi
Vasco Lenzi 2020-7-1
Thanks Maurício for clarifying.
There are options to connect Simscape based component (SSC) and Specialized Power Systems components. There is a library called Interface Elements for this. It may or may not requires you to parametrize a filter in the interface mask to break possible algebraic loops.
see this help section which contains links to an example called >>power_SSCmodeling:
https://www.mathworks.com/help/releases/R2020a/physmod/sps/powersys/ref/currentvoltagesimscapeinterfacegnd.html
The filter may or may not introduce an undesired dynamic, but if you have a fast enough filter, it shouldn't be a problem. You could then put the SPDT within a block with this interface and connecting it then to your SPS network.
There are no plans to discontinue Specialized Power Systems, you can for sure use it in your project with no fear.

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