Variable Universe Fuzzy PID Control Strategy of Permanent Magnet Biased Axial Magnetic Bearing Used in Magnetic Suspension Wind Power Generator

摘要

Improvements of wind power generator in energy utilization rate, electric generation efficiency and reliability can be achieved when maglev technology is applied. This paper presents a maglev horizontal axis wind power generator with two radial permanent magnet bearings and one permanent magnet biased axial magnetic bearing. The structure and working principle of the maglev wind power generator and axial magnetic bearing are presented. The finite element simulations of electromagnetic field in the axial magnetic bearing are performed by ANSYS, and the current stiffness and displacement stiffness are obtained. In order to fit the rapidity and randomness of wind load, the axial displacement of the rotor is controlled based on the variable universe fuzzy PID control strategy. The simulation of the control system is performed in MATLAB.