Synchronizing device

Claim 1

A synchronizing device for a parallel connection of a synchronous generator and an a.c. network, said device comprising: a measuring circuit for measuring a voltage and frequency of said generator and of said a.c. network, and for measuring a phase angle between said a.c. network and said generator voltages; said measuring circuit comprising control outputs for an rpm regulator of a generator drive to adjust an actual value of said generator frequency to within a set value range; said measuring circuit further for measuring a voltage regulation of said generator to adjust said generator voltage to said a.c. network voltage; said measuring circuit further comprising a switching command output for a coupling switch and a computer, said switching command output triggerable by a predetermined set value calculated by said computer from a frequency difference and a predeterminable switching time of said coupling switch, p1 wherein, when said generator is initially started, said computer determines a plurality of optimal set commands for said rpm regulator by detecting a regulation response to each one of a plurality of respective set commands and stores said optimal set commands in a memory, each of said plurality of optimal set commands associated with a difference between said set value and said actual value of the frequency of said generator, wherein, at a start of adjustment, a preset actual value for said generator frequency contains a defined slippage, and wherein, when said phase angle between said a.c. network and generator voltage falls below a predefined value, synchronization is achieved.