Modules for active mains filter and active mains filter

The power filter module has an input unit that receives reference load currents and phase voltages of three-phase supply network (1) corresponding to a non-linear load (2). A transformation unit transforms the load currents and phase voltages in alpha-beta coordinate system. A control module calculates active power and alpha-beta components of phase voltages of the load based on the reference load currents and phase voltages.