In centrifugal compressor installations that use a variable speed drive such as gas turbine, speed control is an effective method of controlling capacity. Compressors are normally protected from surging by an antisurge control loop which recycles the discharged gas to the suction of the compressor. In an upset condition which results in flow reduction, the two controllers may interact whereby performance of the surge controller may be compromised. In this paper, a dynamic simulation technique is used to illustrate the interaction.

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