Apparatus for maintaining synchronism of an...

Details Apparatus for maintaining synchronism of an... Apparatus for maintaining synchronism of an...

H - Electricity

02

P

321/45

H02P 25/02 (2006.01) H02M 7/515 (2006.01)

Patent

CA 1155492

RD-10150 APPARATUS FOR MAINTAINING SYNCHRONISM OF AN INVERTER- SYNCHRONOUS MACHINE DRIVE SYSTEM AT LIGHT OR ZERO MACHINE LOADS ABSTRACT OF THE DISCLOSURE To achieve synchronization of an inverter-synchronous machine drive system, feedback of a phase angle signal, derived in part from stator current drawn by, and voltage supplied to, the synchronous machine, is provided to control the frequency of inverter thyristor conduction. At light or zero synchronous machine load conditions, machine stator current may be of insufficient magnitude to permit derivation of the phase angle feedback signal; therefore, substitute simulated stator current signals, proportional to a preselected combination of inverter thyristor gating pulses, are utilized to derive the phase angle feedback signal, thereby allowing inverter-synchronous machine drive synchronism to be maintained.

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