Control techniques for a high power factor multilevel rectifier based on double boost converter

In this paper three novel control schemes for the single-phase ac/dc conver ter with two-level or three-level pulse width modulation are proposed to im prove the power quality. A diode rectifier with two power switches is adopt ed as a power factor correction circuit to achieve high power factor and lo w harmonic distortion. The proposed control schemes are based on look-up ta bles with a hysteresis current controller instead of the conventional compl ex control algorithm. The proposed control scheme can (1) draw a sinusoidal line current, (2) achieve a unity power factor and (3) improve voltage unb alance problem on the de bus capacitors. The software simulations and exper imental results are shown to verify the proposed control algorithms. It is shown that the measured harmonic currents and input power factor satisfy th e international standard requirements such as International Electrotechnica l Commission 1000-3-2.