Systematic design method of AC permanent magnet generator under pwm rectifier control

Abstract

The invention discloses a systematic design method of an AC permanent magnet generator under the control of a PWM rectifier. It is mainly divided into two parts: fundamental wave characteristic design and harmonic analysis and checking. The fundamental wave characteristic design mainly completes the motor parameter design and Fundamental wave performance check, which is based on the traditional permanent magnet generator design method, combined with PWM rectifier control; harmonic analysis and check is based on the existing motor design parameters, analysis of power generation under system control conditions The harmonic content of the stator current, the electromagnetic field space harmonic and the loss generated in the rotor, and determine whether it meets the design requirements; the present invention inherits the advantages of the analytical algorithms of "magnetic circuit calculation" and "parameter calculation" in the existing design method , created a design method combining "fundamental wave characteristic design" and "harmonic calculation and checking", which solved the problem of "system", "harmonic" and Key issues such as "rotor loss".

Description

technical field [0001] The invention relates to a design method of an AC permanent magnet generator system, in particular to a systematic design method of an AC permanent magnet generator under the control of a PWM rectifier. Background technique [0002] The general design method of the existing permanent magnet generator is formed on the basis of the traditional synchronous generator design method combined with the unique magnetic circuit design method of the permanent magnet motor. machine influences and constraints. [0003] First of all, the existing design method is based on the preconditions of constant voltage and constant speed and constant frequency operation, while the operating speed and stator terminal voltage of the AC permanent magnet generator under the control of the PWM rectifier are both variable; secondly, the existing design method is in the The steady-state analysis method based on the power angle characteristics is used in the performance analysis and...

AI Technical Summary

Problems solved by technology

[0002] The general design method of the existing permanent magnet generator is formed on the basis of the traditional synchronous generator design method combined with the unique magnetic circuit design method of the permanent magnet motor. machine influences and constraints

[0003] First of all, the existing design method is based on the preconditions of constant voltage and constant speed and constant frequency operation, while the operating speed and stator terminal voltage of the AC permanent magnet generator under the control of the PWM rectifier are both variable; secondly, the existing design method is in the The steady-state analysis method based on the power angle characteristics is used in the performance analysis and calculation of the generator, and the control conditions of the generator controlled by the controllable rectifier are not considered, and the operating characteristics of the AC permanent magnet generator under the control of the PWM rectifier are affected by the power electronics. Control of the device control strategy; finally, the existing design methods generally ignore the rotor loss of the synchronous generator, and the AC permanent magnet generator under the control of the PWM rectifier will generate a rotating magnetic field on the surface of the permanent magnet due to the higher harmonics in the stator current Surface eddy current loss is generated, and at the same time, core loss is generated in the rotor core, causing the rotor to heat up. The rotor loss cannot be ignored and should be accurately evaluated and calculated

[0004] Therefore, the existing AC motor design and analysis theories and methods based on constant voltage and constant frequency can no longer adapt to the special situation of permanent magnet motors in controllable permanent magnet power generation systems.

Images