Researches On Fractional-order Pi~λd~μ Excitation Controller Of Micro Gas Turbine

Distributed energy represented by micro-turbine generator is new evolution direction of world energy. The excitation control system is an important component of micro-turbine generator, which exerts important effects on security and stability. This thesis was written on the basis of micro-turbine excitation control system which was designed by Northeastern University Electrical Automation Institute and Shenyang Aerospace Xinguang Group.A switched chopper control system that is based on classical PID for the 75-kW brushless synchronous generator excitation was designed in this thesis.A prototype was designed and local debugging was completed. Because the performances of the adjustment time and frequency characteristic have some disadvantage, the paper brings forward a type of fractional-order PIλDμcontroller.The concepts of fractional derivatives and integral were proposed three hundred years age. Fractional calculus is the theory on the research and application of derivatives and integral of arbitrary order. It is a natural extension of the classical mathematics.Now, the application domains of fractional calculus have increased significantly. Since major advances have been made in fractional calculus in the last few years, the knowledge of fractional calculus begins to be applied in control theory and control engineering. It provides new landscape for control theory and control engineering based on integer-order differential equations.The thesis aims at the model of micro gas turbine that has the characteristics of nonlinear response and the request of the assignment book to design the total project of the control system.The thesis gives a type of nonlinear system model as the booster and adopt classic PID controller to control PWM pulse.It uses this method to control the output of the generator. Meanwhile, the method could be effectively used in the practical micro gas turbine.And then the thesis aims at the problems of the adjustment time and the problems of frequency characteristic which is not advantage by using classic PID controller. A type of fractional-order PIλDμcontroller had been investigated. At the same time, the thesis does the research in frequency domain and gives an analysis method by using gain margins and phase margins. The thesis also analyzed the influence of the orderλandμespecially. The thesis based on the fractional-order PIλDμcontroller that is designed. It uses the root track methods to analyze the stability and put forward a widespread apply of space rook track research methods.Last, the thesis also does some research in the intelligence control realm and gives some basic knowledge in the field of fuzzy fractional-order PIλDμcontroller.