Prime-mover dynamo plants – Electric control – Fluid-current motors
Reexamination Certificate
2006-08-22
2006-08-22
Ponomarenko, Nicholas (Department: 2834)
Prime-mover dynamo plants
Electric control
Fluid-current motors
C290S055000, C322S029000
Reexamination Certificate
active
07095130
ABSTRACT:
To shorten a startup interval to reach a synchronizing condition, a phase difference and an amplitude difference between the grid voltage and the stator voltage of one phase of a winding are obtained. The difference in amplitude is decreased prior to or in parallel to synchronizing the stator voltage with the grid voltage. The calculated compensation phase compensation value is used as an initial value for synchronizing at the next synchronizing operation.
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Futami Motoo
Ichinose Masaya
Sakai Hiromitsu
Hitachi , Ltd.
Hogan & Hartson LLP
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