AC generators; Active filters; Control systems; Harmonic distortion; Inverters; Power electronics; Power harmonic filters; Power system harmonics; Topology; Voltage control AC generators; Control systems; Controllers; Electric inverters; Electric machine control; Electric power factor correction; Harmonic analysis; Harmonic distortion; Power electronics; Programmed control systems; Topology; Voltage control; Analysis and modeling; Low order controllers; Power harmonic filters; Power system harmonics; Series active filters; Single phase system; Total harmonic distortion (THD); Voltage harmonics; Active filters