Surge Control in Constant Speed Centrifugal Compressors Using Nonlinear Model Predictive Control

Surge is one of the two destructive factors in compressors. surge is the stream instability phenomenon in compressor that imposes severe damages to the compressors. Nowadays، suppressingsurge phenomenon is one of the most important issues in oil and gas industries، especially when flow reduction or gas reflux is considered. According to Moore-Greitzer compressor model، this paper designs an active controller for surge control in constant speed centrifugal compressors. As such، the applied operator considered for surge control is Close Couple Valve (CCV) and it is designed to stabilize a centrifugal compressor system with disturbaces using nonlinear predictive controller. The proposed controller، without any information about the amount of Throttle Valve variations، could control the surge instability and reduce the distance between compressor operation point and the surge line. Finally، the compressor system with controller is simulated and the obtained results will show the efficiency of the designed nonlinear predictive controller