Hi Thomas.
There is no “Continuous” simulation-type “Variable Resistor” block available in Simscape Specialized Power Systems (SPS) library. The “Variable Resistor” block in SPS can only run when the “Simulation Type” is set to “Discrete” in the “powergui” block, as per the following documentation:
However, if it is required to vary the resistance based on a non-linear relationship between the voltage and current, custom blocks can be created. The newly created block can be used in “Continuous” mode of simulation. You can refer to the following documentation to know more about creating a custom non-linear resistor block:
A possible workaround is to model the entire system using Simscape Electrical blocks, to use the “Variable Resistor” available in Simscape Electrical library. You can follow this documentation to know more about the same:
The Simscape Electrical network is modelled in the same way as the network made of Simulink SPS blocks, along with the “Solver Configuration” block attached to the model, to configure the solver for the Simscape network. The blocks also have “Initial Targets” tab in the block parameters to specify initial conditions.
I hope this helps resolve your issue.
