METHOD FOR AUTOMATIC CONTROL OF AC MACHINE EXCITATION Russian patent published in 2010 - IPC H02P1/46 H02P9/14 

FIELD: electric engineering.

SUBSTANCE: in method of automatic control of DC machine excitation, they measure real time reactive parametre of the mode and voltage of this machine anchor fixed at a certain distance from anchor clamps within the length of supply line, and act at excitation current of AC machine, at that AC machine excitation current is measured as reactive parametre varies, stabilising this parametre independently on variation of voltage within the limits of measured voltage deviation zone determined by relative resistance of supply line, but not exceeding permissible deviation of measured voltage, and outside this zone of voltage deviation they act by variation of excitation current at maintenance of voltage, simultaneously maintaining reactive parametre stable.

EFFECT: automatic variation of AC machine excitation control process depending on parametres of machine mode and supply grid.

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