Three-phase bridge rectifiers with complex source impedance

The operation of uncontrolled and controlled 3-phase bridge rectifiers with resistive and inductive source impedances is investigated. Equations describing the operation of the systems, from open circuit to short circuit on the d.c. side, are given. Results computed from these equations are presented in graphical form. The effect of varying the ratio of source resistance to reactance is demonstrated. Some experimental results obtained from a model system are presented. From the results, it is shown that the resistive component of the source impedance will have a significant effect on the operation of a rectifier system, unless the source reactance is at least an order of magnitude greater than the source resistance. Resistive components of the source impedance have their greatest impact on the high voltage/low current portion of the load characteristic.