Rotating compressor surge detection using variable speed drive signals

Early surge detection in rotating gas compressors is an important part of any compressor control strategy. To minimize potential equipment damage the surge detection needs to be as quick as possible. Traditionally it is done by looking at process signals, such as pressures and temperatures. Powering compressors by variable speed drives gives opportunity to use additional drive signals for surge detection. This paper focuses on combining process and drive signals to detect a surge. Based on measurements from an experimental compressor rig several surge indicators are proposed.