SURGE PREVENTION CONTROL SYSTEM FOR DYNAMIC COMPRESSORS

摘要

A surge prevention control system for use with a dynamic compressor provides a multiple module controller - for operating an anti-surge valve to bypass flow around the dynamic compressor. The multiple module controller includes a PID control module and a rate control module. The PID control module controls the anti-surge valve to control the operating point of the dynamic compressor about the surge control line. The rate control module uses the rate of approach of the operating point to the surge control line as its process variable. In the event of high rate of approach, the rate control module takes control of the anti-surge valve. The setpoint of the rate control module is adjusted to open the anti- surge valve to control the rate of approach to the surge control line to minimize the overshoot of the PID control.