Systematic design method for alternating current permanent magnet generator under control of PWM rectifier

Abstract

The invention discloses a systematic design method for an alternating current permanent magnet generator under the control of a PWM rectifier. The method mainly comprises two parts: a fundamental wave characteristic design and harmonic analysis and verification, wherein the fundamental wave characteristic design is mainly used to complete a motor parameter design and fundamental wave performance verification, and is combined with the control of the PWM rectifier based on a conventional permanent magnet generator design method; the harmonic analysis and verification is used to analyze the current harmonic wave content of a generator stator, the space harmonic wave of an electromagnetic field and the loss generated of the stator in a rotor under the condition of system control based on the existing motor design parameter and judges whether the design requirement is satisfied or not. The method disclosed by the invention inherits the advantages of magnetic circuit computation and parameter calculation analytical algorithms in the existing design method, creates a design method combining the fundamental wave characteristic design and harmonic analysis and verification and solves the critical problems of system, harmonic waves, rotor loss and the like in the permanent magnet generator design and the like which cannot be solved in the existing method.

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...

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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.

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