I am new to PSCAD and using PSCAD free version to simualte a simple power system using three phase voltage source 3. However, I am unable to change the postive sequence impedance values for this system. Is there this a limitation of the free version? Please advice.
You should be able to change the positive sequence in the free version. You can check the configuration page. Look for example the infinte bus, did you enter "Yes"? You can switch impedance data format, mag/ang or real/imag?
There are two other source models "1" and "2". Do you see the same issue?