Numerical Analysis Of The Characteristics Of AC Excited Hybrid Excitation Synchronous Generator

In view of the deficiency of that air gap density of permanent magnet motor cannot be adjusted and output voltage are greatly influenced by load changes and environment temperature changes, this thesis proposes a new paratactic structure hybrid excitation synchronous generator, that means permanent magnet motor and electrical excitation motor are paralleling installed, The two parts of stator core are independent with each other, sharing a set of the armature winding of the stator, which makes two parts in the stator armature winding can overlap mutually, and complete the function of the hybrid excitation; Finally reached the purpose that the output voltage is adjustable by adjusting the amplitude and phase of exciting current in electro-magnetic part. This article made optimization design of the motor structure based on the Taguchi method, and respectively established the field-circuit coupling simulation model of 11KW permanent magnet generator and the motor model of electrical excitation part with the structure parameters which had been optimized, And theory analysis and large amount of simulation have been carry out on no-load characteristics and load characteristics of hybrid excitation generator.The magnetic field equation of the permanent magnet synchronous generator inner, loop equation of motor windings and time step finite element field-circuit coupling discrete model which contain external connection relation are derived, Structural optimization of the rotor of permanent magnet motor was made by Taguchi method, which improved the steady state performance of the motor, and using field-circuit coupling model of permanent magnet synchronous generator which had been optimized, the simulation analysis of no-load operation, load operation and three phase fault operation characteristics of the generator was carried on, that obtained three phase current, voltage curve that under various operating conditions, and verified the correctness of the 2D field-circuit coupling simulation model.And then, design optimizations of the structure of electrical excitation on hybrid excitation generator was carried out by the Taguchi method again, and get a better no-load air gap flux density waveform of electrical excitation. According to the electromagnetic field equation of electrical excitation, time step finite element program with ANSYS software was programmed, and the air gap flux density of the electrical excitation of new hybrid excitation motor was disposed with the aid of MATLAB software, and the no-load simulation analysis of model which had been optimized was made.Finally, the finite element analysis of hybrid excitation generator was taken, and simplified calculation process by using 2D finite element numerical calculation; We got the no-load characteristics of the hybrid excitation generator through the analysis of permanent magnet motor and electrical excitation motor by static magnetic field method; The voltage balance equation of hybrid excitation generator was deduced, and the generator performance parameters was established, which has make the foundation of the analysis of load characteristics and external characteristics of hybrid excitation motor.