초록 ▼

A method of control and control apparatus 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. This load-sharing scheme follows the safest load-sharing formula and also provides

A method of control and control apparatus 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. This load-sharing scheme follows the safest load-sharing formula and also provides for substantial energy savings. It automatically divides the load whenever a strong decoupling between process control and compressors after the compressors\operating points cross their Surge Control lines.

대표청구항 ▼

A method of controlling a compressor station receiving gas from an upstream process, compressing the gas and delivering it to a process downstream thereof, said compressor station having a station control means to adjust the station performance to the demand of a process located upstream or downstre

A method of controlling a compressor station receiving gas from an upstream process, compressing the gas and delivering it to a process downstream thereof, said compressor station having a station control means to adjust the station performance to the demand of a process located upstream or downstream, said compressor station including also a plurality of dynamic compressors driven by a plurality of respective prime movers, each of said dynamic compressors having a variable performance, a main control means associated with each of said compressors for changing its performance and a surge control means associated with each respective compressor for maintaining said respective compressor along a surge control line having a predetermined equation and located a predetermined distance from the respective surge limit of each respective compressor; said method comprising: transforming said 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, said variable criterion reaching a predetermined value when said relative distance reaches zero value; simultaneously changing the set points for all of said respective criterions representing the relative distance between each respective compressor\s operating point and its surge control line by changing an output of said station control means to control the performance of said compressor station; and keeping said set points equal and maintaining said criterion substantially equal at substantially all times for each of said respective compressors.