Realise transfer function through Opamp using Simulink/Simscape

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I have built a dc-dc converter using SimPowerSystems. I am trying to realise its current-controller by using Opamp from the SimScape-->Electrical Systems library. I subtract the current flowing in inductor from the the reference current (ie... a number in the 'Constant' block) to generate error using the 'Sum' block. I want to input the resultant error into a PID controller which is built using Opamp feedback circuit. However, I am not able to connect the error terminal (ie...output of Sum) into the input of Opamp. Please advise...Thanks

Answers (1)

Suneesh
Suneesh on 9 Dec 2013
Simscape and Simulink components cannot be directly connected. You need to use the blocks 'PS-Simulink Converter' or 'Simulink-PS Converter' which are in the library simscape > Utilities
  2 Comments
Anubhav
Anubhav on 9 Dec 2013
I did use the S-PS and PS-S converters but still not able to connect the output of PS-S to input of Opamp circuit. Please see attached snapshot.
Suneesh
Suneesh on 10 Dec 2013
That makes sense. The problem is that your electrical circuit is not complete. You are doing the correct thing on the left side of the image, you have a voltage sensor which you connect to the Simulink blocks using PS-Simulink convertor. You need to do something similar on the problematic part as well. Since you are connecting in series with a resistor, you need to have a current source (From the Electrical Sources library) there to which the Simulink-PS block would connect.

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