How to correctly calculate three-phase voltage at the PCC parallel point ?

I simulated STATCOM model and found that the calculated voltage at PCC point is not correct with the discrete solver used, how to get the correct voltage? Here is the model file I built.Thanks.

[nick]

Hello xin,

Kindly share the expected output of the model in order to help resolve the issue effectively.

Answer 1

[Sahas]

Dear @xin,

As per my understanding, the provided model is giving PCC voltage as an output which is not accurate when using the “discrete solver”.

I was able to compile and run the model provided. The model provided uses a “Fixed-step discrete (no continuous states)” solver.

I recommend using the following configuration parameters in the “Model Settings” to get a more precise result. You can open the settings window by using the “Ctrl+E” keyboard shortcut.

• Use an appropriate discrete time step. As a rule of thumb, the time step should be at least 10 times smaller than the smallest time constant in your model. For power electronics, this often means choosing a time step in the microsecond range.
• Enable "zero-crossing detection for fixed-step simulation" option in the "Solver details" section. This allows the solver to capture the exact moment when an event occurs.

Refer to the following MathWorks documentation for choosing the most appropriate “solver” for simulation tasks: https://www.mathworks.com/help/simulink/configure-simulation.html

Hope this is beneficial!