Hello Dharini,
I would recommend sticking with only specialized power systems (specialied technology/simpowersystems) or simscape electrical (simscape power systems simscape components). There are enough block equivalents that in most cases you should not need to combine them. Combining the two technologies makes it much harder for the simulations to converge and inserts decoupling which reduces accuracy of the model. If you really want to though, there are blocks set up to connect them: https://www.mathworks.com/help/releases/R2019a/physmod/sps/interface-to-simscape.html?s_tid=CRUX_lftnav
Regards,
Joel
