the harmonic filter is fixed at 250 Hz, and the value of the parallelcapacitor is 11 F; thus by using (1), the value of the series inductorwill be 36.8 mH.
fc = 1
2
√
LC
(1)where fcis cut-off frequency in Hertz (Hz), L is series inductor inharmonic filter in Henry (H), C is parallel capacitor in harmonicfilter in Farad (F).An experimentally designed filter is then built, as depictedin Fig. 11. It is composed of one series toroidal inductor and 5Fig