Three-phase High Power Factor Rectifier Based On The Single-cycle Control Study

The attention devoted to reducing harmonic pollution is increasing. Power Factor Correction (PFC) is an effective method to reduce harmonic current in power grid. Significance of Power Factor Correction is clarified in this dissertation. A comprehensive review of the recent development and principles of various topologies and control strategies in active PFC are given. One Cycle Control technology introduced in this dissertation is a kind of large signal, nonlinear control technique. It is applied successfully to the control of three-phase high power factor (HPF) rectifiers. These studies in the dissertation have been done as follows:Based on the One Cycle Control technology, a general and novel PFC controller is proposed for single-phase rectifiers. The principle of the PFC controller is illuminated particularly. The proposed controller does not require multipliers, and only consists of one integrator with reset along with some logic IC and linear components. It simplifies the structure and complication of circuit and is easy to realize.With theoretical analysis, three-phase general PFC controller based on One Cycle Control for three-phase three-switch rectifier is deduced. The proposed controller has the following features: no needing for multipliers and input voltage sensors, constant switching frequency, circuit simpleness, unity power factor and low distortion. Simulation are presented at last, they prove that with the proposed three-phase PFC controller rectifier's input current total harmonic distortion is only 4.11% and its power factor (PF) can reach 0.999.