Patent ID: 6208120
Filing Date: 2001-03-27
Classification: H02P

Abstract:
An excitation control system for a rotating electrical apparatus including an input having an excitation voltage, said excitation control system comprising:a controlled rectifier bridge including an input interconnected with a plurality of alternating current phases each of which has a positive polarity and a negative polarity, an output interconnected with the input of said rotating electrical apparatus in order to provide said excitation voltage thereto, and a segment for each of said positive and negative polarities of the alternating current phases, each of said segments having an element responsive to a control signal in order to control current conduction within said segment between the input and the output of said controlled rectifier bridge;means for requesting a maximum value of said excitation voltage for said rotating electrical apparatus;means for determining when said rotating electrical apparatus is on-line;means for providing an error signal from the alternating current phases; andmeans for outputting the control signals to said segments in order to control current conduction within said segments, said means for outputting including means for repetitively and simultaneously outputting the control signals to each of said segments in response to: (a) said error signal exceeding a predetermined value, (b) the maximum value of said excitation voltage for said rotating electrical apparatus is requested by said means for requesting; and (c) said means for determining determines said rotating electrical apparatus is on-line, in order that said controlled rectifier bridge emulates a diode bridge.