Fuzzy logic surge control in constant speed centrifugal compressors

This paper presents the application of fuzzy logic active control of surge in constant speed centrifugal compressors based on the Moore-Greitzer (MG) model. A compression system equipped with a close-coupled valve (CCV) and a throttle control valve (TCV) is investigated. Two fuzzy controllers are developed, one for each valve. The combination of the two valves proves helpful in suppressing surge and assists in overcoming the drawbacks of each valve when it is used individually. A case-based switching mechanism is developed for the compressor with both valves that stabilizes the system for various operating conditions, and extends the stable range well beyond the surge line.