Hi there,

Have a look at the example demo of Active filter in SIMULINK. I also recommend the book by Arindam Ghosh, "Power Quality".

Good luck

There are many theories to control active power filter, use statcom or simple VSI. And use SRF control or dq0 theory. These are very simple.

Estimate harmonics present / developed and then try, to satrt with referring to https://www.electronics-tutorials.ws/filter/filter_5.html

for Active Low Pass Filter and to

https://www.electronics-tutorials.ws/filter/filter_6.html

for Active High Pass Filter.