F - Mech Eng,Light,Heat,Weapons – 04 – D
Patent
F - Mech Eng,Light,Heat,Weapons
04
D
230/27
F04D 27/00 (2006.01)
Patent
CA 1256835
ABSTRACT OF THE DISCLOSURE A method of control and a control apparatus are provided herein for load sharing between multiple compressors working in parallel and/or in series which enables all of the load-sharing compressors to carry their optimum share of the load. One embodiment of the method comprises transforming the predetermined equation of each respective surge control line into a variable criterion representing a relative distance between each respective compressor's operating point and its surge control line, the variable criterion reaching a predetermined value when the relative distance reaches zero value; simultaneously changing the set points for all of the respective criteria representing the relative distance between each respective compressor's operating point and its surge control line by changing an output of the station control means to control the performance of the compressor station; and keeping the set points equal and maintaining the criterion substantially equal at substantially all times for each of the respective compressors. An embodiment of the improved apparatus comprises means for maintaining one of said gas parameters constant for each respective compressor; means for computing a criterion representing a relative distance between each respective compressor's operating point from the respective surge control line; set point control means for controlling one of the gas parameters by simultaneously changing the set points of each respective compressor for the criterion, Abstract of the Disclosure continued (page 2) representing the relative distance between each respective compressor's operating point and its surge control line; and means for maintaining the criterion substantially equal at substantially all times for each of the compressors.
475723
Mirsky Saul
Staroselsky Naum
Borden Ladner Gervais Llp
Compressor Controls Corporation
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