We have lots of power quality issues related to grid voltage like fluctuation, sag, swell, harmonics, etc. In my opinion, a single-phase PLL cannot track Angle correctly in this situation. A simple method to implement PLL through software is using Park transform and Moving Average Filter to filter out the mentioned noises. There are many other methods also Complex Coefficient Filter, Notch filter, etc. I think since grid-connected converter is a common application, is any chip available?
Are three separate PLLs able to cancel out the errors?
Your comment is appreciated.
Thanks