METHOD TO SYNCHRONISE DIGITAL CONTROL SYSTEM Russian patent published in 2011 - IPC H02M1/08 H02M7/162 G05F1/46 

FIELD: electricity.

SUBSTANCE: in method to synchronise digital control system, a sync pulse is generated by comparison of filtered synchronising voltage with reference voltage, to eliminate accumulating error of synchronising voltage constant component integration, the range of output integrator variation is limited, besides, speed of growth is twice less compared to speed of signal decrease, and in order to eliminate phase error in case supply grid frequency varies, voltage of output comparator is set as equal to half of maximum value of output integrator with account of such shift voltage that synchronisation of digital control system is carried out at the moment of highest value of the first harmonic of synchronising voltage.

EFFECT: higher accuracy of synchronisation under conditions of several transformers operation for grid of limited capacity or from converting transformer with direct supply of synchronising voltage from input busbars of controlled bridge rectifier.

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