Pump turbine, method of controlling thereof, and method of stopping thereof
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United States of America Patent
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-
Aug 5, 2003
Grant Date -
N/A
app pub date -
Oct 27, 2000
filing date -
Oct 29, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pump turbine includes a runner connected to a generator motor, a water discharge controller for adjusting the quantity of water passing through the runner and a governor for detecting a rotational speed of the runner and controlling the water discharge controller to get a predetermined rotational speed of the runner. Upon a load rejection which shuts off the generator motor from an electric power system, the governor is controlled to make a target speed value of the runner after a load rejection higher than a target speed value before the load rejection. The target speed value is a reference speed to be compared with actual speed so that the governor determines when or how to open or close a water discharge controller in response to a balance between the two speeds.
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