A modified switching signal generation technique to minimize the RMS tracking error in active filters

A variation of the pulse width modulation (PWM) operating technique, which we call "adjustable carrier PWM," is analyzed. The technique is applied to an active filter in order to compensate the low harmonics present in a load current. The aim is to prove that the proposed technique performs better at minimizing the root mean square (RMS) tracking error between the reference and the real currents than the usual PWM techniques in active filtering. Four generating techniques were simulated and compared in terms of the total and individual harmonic distortion (THD and IHD) in the supply current. The proposed technique was tested against experiments.