In a synchronous machine with rectifier excitation, overvoltage maybe induced across the field winding during adisturbance when the field current tends to reverse its direction and is blocked by the rectifier. By introducing the dynamic impedance in the incremental equivalent circuit, the paper proposes a new mathematical model for calculating and analysing this overvoltage. The expressions of dynamic impedance, as derived in this paper with some simplifications, differ greatly from each other in various ki...
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