An analysis of three-phase rectifiers with constant voltage loads

In this paper, a numerical analysis of three-phase voltage loaded rectifiers is presented. The simulation is performed on the equation system level, for normalized circuit model. Possible combinations of diode states are analyzed, and it is shown that out of 2⁶ = 64 combinations only 13 might occur. For all of the combinations, circuit equations and boundary inequalities are derived. The circuit order is shown to be be zero, one, or two, depending on the diode state combination. Number of boundary inequalities to be monitored is shown to vary from three to six, depending on the diode state combination. Phenomenon of instantaneous combination transitions is analyzed. Modes of the circuit operation are defined. Dependence of various circuit parameters on normalized output voltage is presented. Obtained diagrams may serve as a quick reference guide for the rectifier design, and presented analysis may be of interest in education.