Abstract
ABSTRACTThis paper indicates the use of explicit nonlinear model predictive control method to prevent and control of compressor surge using extended Greitzer model. To encompass the effects of fast transients, nonlinear extended Greitzer model is considered for modelling and control of the compressor system. This model covers the effects of different parts, especially the compressor system pipeline, as the most important factor in the occurrence and acceleration of the surge. Also, the mathematical description of the flow dynamic of compression system is derived in the presence of close-coupled valve (CCV) as the most commonly used actuator. For controlling the compressor system surge instability, explicit nonlinear model predictive control (NMPC) is applied, whose allows efficient online implementation, significantly enlarges the operating region of the compressor and enhances the authority of the control system. Numerical simulations show that the proposed control system is able to meet the desired specifications in avoiding and active control of surge, in the presence of different types of disturbances occurring along the pipeline.Ovo je primjer sažetka. Ovo je primjer sažetka. Ovo je primjer sažetka. Ovo je primjer sažetka. Ovo je primjer sažetka. Ovo je primjer sažetka. Ovo je primjer sažetka. Ovo je primjer sažetka. Ovo je primjer sažetka. Ovo je primjer sažetka. Ovo je primjer sažetka. Ovo je primjer sažetka. Ovo je primjer sažetka. Ovo je primjer sažetka. Ovo je primjer sažetka.
Highlights
Compressors are essential machines in modern industrial processes for the pressing and transportation of gases and fluids
Surge is one of the main dynamic instability limiting the operation of centrifugal compressors [1] and it is an asymmetrical oscillation of the flow through the compressor and is characterized by a limit cycle in the compressor characteristic
Overcoming the problems, we present new numerical results in the compressor surge explicit nonlinear model predictive control (NMPC) using the close-coupled valve (CCV) as an actuator in the compression system
Summary
Compressors are essential machines in modern industrial processes for the pressing and transportation of gases and fluids. Based on a recently presented enhanced compression system model with variable impeller tip clearance and pipeline acoustics, a surge controller is designed [29], but there are two objections in this case including the linear controller is not capable in capturing strongly nonlinear dynamics of compression system and common actuators are the close-coupled valve [30] and the throttle valve [31]. A surge controller is designed for a centrifugal compressor system based on the enhanced compression system model recently presented in [14], that supports fast and slow transients, captures the effects of pipe. It allows high-speed control of the compressor system using the CCV actuator. Reservations about an explicit nonlinear predictive control and the simulation results for various cases will be discussed in third part
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