Pumps – Condition responsive control of pump drive motor – Plural pumps having separate drive motors – supply sources,...
Patent
1996-04-03
1998-04-28
Freay, Charles G.
Pumps
Condition responsive control of pump drive motor
Plural pumps having separate drive motors, supply sources,...
417 5, 417 441, 417 442, 415 1, F04B 4900
Patent
active
057437149
ABSTRACT:
A method and apparatus are disclosed for controlling a multicompressor station so that the overall work requirement of the station is minimized while maintaining the compressors in a non-surge conditions. The apparatus includes interconnected control loops for controlling the turbine speed of variable speed compressors or the throttling valves of constant speed compressors that determine a set of criterion for computing the value and sign of the first derivative of work performed by the station. The speed of each compressor is then set to reduce overall system work while maintaining discharge pressure of the station and maintaining the compressors in a non-surge operating format. The method includes the steps of computing the criterion, computing the value and sign of the first derivative of the work function and adjusting the compressor speed to minimize station work while maintaining the compressors in a non-surge condition.
REFERENCES:
patent: 4384818 (1983-05-01), Blotenberg
patent: 4464720 (1984-08-01), Agarwal
patent: 4640665 (1987-02-01), Staroselsky et al.
patent: 5108263 (1992-04-01), Blotenberg
patent: 5347467 (1994-09-01), Staroselsky et al.
patent: 5508943 (1996-04-01), Batson et al.
Drob Dmitry
Freay Charles G.
Thai Xuan M.
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