| Achieving Maximum Power Point Tracking (MPPT) and Variable Speed Constant Frequency (VSCF) are two fundamental issues of wind power generation. In this paper, the hybrid-driven permanent magnet wind turbine is used as the research object. The nonlinear dynamical and control problems of the two key technologies are studied. The following work is achieved:Firstly, a nconlinear model of permanent magnet air gap-aerodynamic double coupling of hybrid-driven permanent magnet servo motor is established. When the parameter changed, the occurrence mechanism and occurrence condition of chaos are analyzed. The passive controller is designed to realize eliminate the purpose of chaos movement.Secondly, a dynamic model considering the stiffness and damping of the coupling is established with the hybrid transmission system as the core. On this basis, the aerodynamic model, the main generator model, the PMSM control model, the wind speed model and the pitch angle control system model are further studied. In order to simplify the problem and highlight the nonlinear characteristics of aerodynamics, the rest of the model establishes a linear model by simplifying the analysis and assumptions, leaving only the aerodynamic nonlinearity, and obtaining the nonlinear model of the whole hybrid driving power system.Thirdly, according to the above-mentioned system nonlinear model, the control strategy of the maximum power tracking at low wind speed is proposed by using the knowledge of fuzzy control,and the fuzzy PID controller is designed. The simulation results show that the control system has achieved the control target very well.Fourthly, based on the feedback linearization control theory, the feedback linearization model of the nonlinear equations of the hybrid drive permanent magnet wind turbine system is designed and the final nonlinear feedback control law is obtained. The simulation results show that the controller realizes the control target of the system. |
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