Sunday, April 10, 2016
There are several ways:
The most basic and fundamental one is based on series LC circuit with high Q factor: Harmonic trap. The circuit resonates at a specific harmonic frequency and is essentially a short circuit in this specific frequency.
More advanced technique is based on switched LC filter. I recommend looking at ABB's Static VAR compensator as an example.
APF is based on the traditional bridge-rectifier circuit, with boost converter.
The switch on/off s ...