Abstract
Problem statement: The surge phenomenon in the centrifugal compressor, the non-linearities and uncertainties of the compression system make it impossible to use a conventional controller over a wide range of operation. Approach: A new dual fuzzy controller for nonlinear model of compression system was proposed in this study. This fuzzy controller was designed that consisted of active surge control and phase control without any explicit system models, but driven in human thinking mechanism. Results: Simulation example of compression system was given to demonstrate the validity of proposed control scheme. It was shown that fuzzy controller can be simplified and good tracking control performance can be achieved by choosing appropriate fuzzy roles. But, the dual fuzzy controller can successfully intervene in control surge of compression system. Conclusion: This new fuzzy control methodology suggested in this study reproduced well main characteristics of turbo compressor dynamic model developed by Moore and Gretzer and give place to a more precise and easy to handle representation. It is about an inaccuracies reproducing with a certain degree of satisfaction of real process without being as much complex.
Highlights
Today the compression systems are subjected to highly hostile working conditions
The first is the results of simulations of the compression system in low back pressure and the high back pressure nearing surge at 15 KRPM of compressor speed and the simulations of the compression system without control of surge and the second simulation is the compression system with control of surge using fuzzy logic controller
The response of the compression system with control of surge using fuzzy logic controller is shown in Fig. 9 and the response of the compression system with Control Using Fuel Valve Actuation is shown in Fig. 10 fuzzy logic controller of the compression system was constructed using data from the simulation model
Summary
Today the compression systems are subjected to highly hostile working conditions. The manufacturer is greatly interested with any improvement in performance, life and weight reduction without loss of reliability. It is worthwhile to carefully estimate the reliability of rotating systems in order to improve the control system or eventually modify the design. Reliability analyses of the control structure require some information on the model of the compression system. We know it is difficult to obtain the mathematical model for a complicated mechanical structure. The turbo compressor is considered as a complex system where many modeling and controlling efforts have been made
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