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(11) | EP 0 140 499 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Compressor surge control |
(57) A surge control system (18) for a compressor anticipates the actual surge condition
and initiates anti-surge protection in proportion to the magnitude of the anticipated
surge condition. This is done by providing a feed forward signal from a control station
(20) to a summing station (48), along with a normally generated surge control line
point, to offset this point by an amount determined by the feed forward signal. The
offset point is used as an input to a controller (56) for controlling a bypass valve
(28) in a bypass loop around the compressor. |