초록 ▼

An autosynchronizer for use with a system having generator and bus voltages and having a breaker circuit for connecting the generator and bus voltages to each other. The autosynchronizer synchronizes the frequency and phase of the generator and bus AC voltages by controlling the generator voltage. A

An autosynchronizer for use with a system having generator and bus voltages and having a breaker circuit for connecting the generator and bus voltages to each other. The autosynchronizer synchronizes the frequency and phase of the generator and bus AC voltages by controlling the generator voltage. A microprocessor compares the frequencies of generator and bus voltage signals, the microprocessor generating a proportional difference signal having a parameter representative of a proportional difference in frequency between the generator and bus voltage signals. The proportional correction range extends within the synchronization range. The microprocessor permits a sync signal when the frequency difference of the frequencies of the generator and bus voltage signals is within the synchronization frequency range. A first output circuit responsive to the proportional difference signal provides a correction signal to the generator for varying the frequency of the generator. A second output circuit responsive to the sync signal provides a breaker close signal to the breaker circuit for closing the breaker thereby enabling connection of the generator and bus voltages. A frequency correction dead band within the frequency range and a target slip band within the dead band define a zone of limited proportional correction to nudge the generator into synchronization and prevent a hung scope.

대표청구항 ▼

An apparatus for use with a system having first and second voltage sources having first and second alternating current (AC) voltages, respectively, said system having a breaker circuit for connecting the first and second voltage sources to each other, said apparatus for synchronizing frequency and p

An apparatus for use with a system having first and second voltage sources having first and second alternating current (AC) voltages, respectively, said system having a breaker circuit for connecting the first and second voltage sources to each other, said apparatus for synchronizing frequency and phase of the first and second AC voltages by controlling the first voltage source, said apparatus comprising: a first conditioning circuit connected to the first voltage source and providing a first voltage signal representative of the first AC voltage of the first source; a second conditioning circuit connected to the second voltage source and providing a second voltage signal representative of the second AC voltage of the second source; a microprocessor comparing frequencies of the first and second voltage signals, said microprocessor generating a pulsed proportional difference signal having a pulse width representative of a proportional difference in frequency between the first and second voltage signals and having a pulse interval, said microprocessor permitting a sync signal when the frequency difference of the frequencies of the first and second voltage signals is within a synchronization frequency range wherein the pulse width or the pulse interval is programmable by the operator; a first output circuit responsive to the proportional difference signal and providing a correction signal to the first voltage source for varying the frequency of the first AC voltage; and a second output circuit responsive to the sync signal and providing a breaker close signal to the breaker circuit for closing the breaker thereby connecting the first and second voltage sources whereby proportional control of the frequency of the first voltage source is achieved when the frequency of the first voltage source is not synchronized with the frequency of the second voltage source.