Lahoida A. Antisurge Control of Gas Pumping Units Using the Methods of Fuzzy Logic

The thesis is devoted to antisurge control of gas pumping units. The dynamic mathematical model of the surge phenomenon in the centrifugal pumping unit supercharger with the account of the gas bypass through the antisurge valve is designed. The generalized mathematical static model of the centrifugal pumping unit supercharger for a set of gas-dynamic characteristics is designed. On the basis of the spectral density functions of the gas compression ratio and supercharger performance, the transfer function of the centrifugal pumping unit supercharger is determined. The synthesis problem of the time optimal subsystem of automatic antisurge control is stated. The synthesis problem statement of the subsystem regulator of automatic antisurge control, based on the inversion operator usage, is formulated. Based on the transfer function of the centrifugal supercharger, the models of multiparametric PIDD2- and PIDD2D3-regulators, as well as the method for these regulators synthesis, are developed. The structures of the PDD2- and PDPD-regulators, the transfer function of which is inverse to the transfer function of the control object, are designed. The synthesis of the optimal time control law of the centrifugal pumping unit supercharger with the gas turbine drive is conducted. The PIDD2- and PI-fuzzy-regulator, as well as the PID regulator with the fuzzy block of automatic adjustment of coefficients, are developed and synthesized. The simulation model of the centrifugal pumping unit supercharger with the account of the antisurge valve is designed. The simulation modeling of the developed regulators is conducted and their comparative analysis is carried out.