Low-head hydroelectric installation
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United States of America Patent
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-
Feb 3, 1987
Grant Date -
N/A
app pub date -
Feb 25, 1985
filing date -
Feb 24, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Low-head hydroelectric installation, in particular for a tidal power station, intended to operate under variable heads of water that can fall to values in the region of zero. When the head of water is lower than a defined value (Hd), lower than at least half the nominal head (Hn), the turbo-machine (1) is made to rotate at a speed (n1, n2, n2, . . . ) lower than the synchronous speed (ns) and bringing its efficiency near to the heart of the efficiency contours. For this purpose, a frequency converter (7) is inserted between the rotary electrical machine (3) and the network (4), the converter (7) being constructed for a power in all cases lower than at least half the nominal power (Pn).
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