What is the port compatibility for Simscape blocks?

Hi,

Whenever I work with simscape, I have this issue. Where is the port compatability defined?? I couldnt find any documentation related to this.

Some of the simscpae blocks are not connectable to any other directly in Simulink. Also, the PS-Simulink converter doesnt help

Here(in the fig), you can see that the A port is not connecting to anything. I tried to use all possible ways. My main aim is to connect scope to it and check the waveform. But its not connecting simply. I tried using a voltage sensor, which is a simscape element. But still its not connecting.

Ps: its not the issue of input ports or output ports. The conservative ports ABC in the above image are output ports of the block.

Answer 1

[Divyanshu]

Hi Raghuveer,

There is no such documentation which has information about port compatibility of all Simscape blocks. Generally, two blocks which belong to different Simscape Components cannot be connected directly.

• PS-Simulink/Simulink-PS Converter block is used to connect a physical signal to simulink ouput signal or vice versa, this cannot be used to connect two different simscape components.
• Now in-order to measure/observe the waveform or input given to 'Two-Level Converter' you might have to use some blocks from 'Simscape>Electrical>Specialized Power Systems>Utilities' like Voltage-Current Simscape Interface (gnd) or Current-Voltage Simscape Interface (gnd).
• Two-level converter once connect to 'Voltage-Current Simscape Interface (gnd)' the other port of this block can be connected to corresponding sensor to measure/observe the input.

[RAGHUVEER RAJESH]

Hi Divyanshu,

Thanks a lot for your reply. Does that mean that by simply connecting it between the specialised systems and general simscape blockes the circuit will work absoluetly fine? I am especially confused because the block you recommended is not passive but is active. It acts as a voltage source on the specialised blocks side and as a current source on the general simulink block side(as I understood from the documentation).

Edit: I found the pass through option to bypass the filter. Not sure if this block is now passive... But stil...

[RAGHUVEER RAJESH]

Additionally, the block already measure the voltage internally. Do I still connect a voltage sensor at the output of this block?

But still, the output of this block is not directly connectable to the PS-Simulink converter. So that makes me curious why is this block needed at all. I need to see the output of the specialised Simscape blocks on the Scope. But its currently not possible due to port incompatability. Thats why I asked whether there is any place where Mathworks has documented the port compatiblity? If I had'nt asked this question here, what were my chances of finding the right solution elsewhere on the internet.

Kindly guide me.

Thank you for your time and assistance!!

[Divyanshu]

Hi,

I just wanted to direct you towards using the components from same Simscape Paradigm. The blocks which I mentioned earlier are just example which can be used with 'Two-level converter', they may not be required/relevant in your use-case.

Now if you want to observe certain values of 'Two-level converter' on scope block directly:

Here are the measurement blocks which you can directly connect to scope block on one end and other end to 'Two-level converter': 'Current Measurement','Voltage Measurement','Impedance Measurement' etc.

The path to these blocks is: Simscape> Electrical > Specialized Power Systems > Sensors and Measurements.

You may have to choose appropriate block depending upon the use-case.

[RAGHUVEER RAJESH]

Hello @Divyanshu, Thank you once again for your response. I understand that this might not be direct solution for my problem. And I appriciate your efforts.

What I am trying to figure out is, how do I know what is the solution? Where could I possibly find the solution to this compatibility issue? Is it documented anywhere by @MathWorks Support Team? I need to provide refrences to everyhting I do in the model. Where can I find the reference for the technique you have exaplined? @MathWorks Support Team could you please help me finding a proper documented reference for the above method.

@MathWorks Support Team, whenever I work with simscape, I have this issue. Where is the port compatability defined?? I couldnt find any documentation related to this.

Thanks in advance...