How do I connect a "Current-Voltage Simscape Interface GND" block in three-phase circuits?

I have a three-phase electric circuit made with Specialized Power Systems components in Simulink R2022b. I am using the "Current-Voltage Simscape Interface GND" block next to each phase of a given three-phase circuit. I intend to connect this three-phase circuit with a "Three-Phase V-I Measurement" block in Simulink through this interface block, but the model reports an error as follows:

Block 1: Current-Voltage Simscape Interface (gnd)/Controlled Current Source
Block 2: Current-Voltage Simscape Interface (gnd)1/Controlled Current SourceAdd a high-value resistance in parallel with one of the two block.
You can also specify high-value resistive snubbers if the blocks have a snubber device.
You can avoid the use of the snubber by selecting the 'Continuous' simulation type in the Solver tab of the Powergui
and deselecting the 'Disable ideal switching' option in the Preferences tab of Powergui block.Component:Simulink | Category:Model error

How do I successfully connect these blocks?

Answer 1

[MathWorks Support Team]

As described in the error message. the “Current-Voltage Simscape Interface (GND)” block needs to have an alternate current flow in its way, since this block comprises a “Controlled Current Source” block in its internal structure. More information about this block can be found in the following link:

https://www.mathworks.com/help/releases/R2022b/sps/powersys/ref/currentvoltagesimscapeinterfacegnd.html

The solution for this issue is a large resistor, but since this is a three-phased circuit, the block “Three-Phase Parallel RLC Branch” is the one that fits best the intended workflow and solves the controlled-current-source series-connection error.The following steps are recommended to successfully connect these blocks:

1. Create a “Three-Phase Parallel RLC Branch” block. More information about this block is found as follows:

https://www.mathworks.com/help/releases/R2022b/sps/powersys/ref/threephaseparallelrlcbranch.html

1. Connect each of the outputs in one side of the block to each phase that exits the “sps” port of the “Current-Voltage Simscape Interface (GND)” blocks in your Simulink model.
2. Connect each of the outputs in one side of the block to a common ground point. The ground point can be created by a “Ground” block in the Simscape library. More information about this block is available in:

https://www.mathworks.com/help/sps/powersys/ref/ground.html

The following picture illustrate this process: