Abstract：Based on the equivalent circuit of a 3-phase 4-wire generator-rectifier system, this paper presents the dynamic average-value model (AVM) of 4-wire diode-bridge rectifier under continuous conduction mode (CCM) using state-space averaging method. The AVM is validated by the corresponding switching model of rectifier by simulations in the Matlab/Simulink environment, and by a hardware test system composed of a synchronous generator and its 3-phase 4-wire diode-bridge rectifier load. The results show that the AVM can captures the key steady-state and transient characteristics of the rectifier, and the agreement of DC voltage between the AVM, the switching model, and the hardware circuit are well. The model presented herein can be used for modeling, impedance mapping, and stability assessment with small disturbance of such generator (transformer) -rectifier systems.
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2009, Vol. 24 
