SVPWM harmonic suppression method applied to nine-phase open-end winding motor

Abstract

The invention discloses an SVPWM harmonic suppression method applied to a nine-phase open-end winding motor. The method comprises the following steps of: reconstructing a vector point representation mode, and representing different vector points by using a level state instead of a switch state; dividing all the vector points into nine groups of vector point sets according to a distribution relation between a non-zero level and a zero level; selecting a vector point with the maximum amplitude from each group of vector point sets as nine groups of new optimal vector sets; classifying the nine groups of optimal vector sets into odd number item maximum amplitude subsets and even number item maximum amplitude subsets according to parity; according to the characteristics of the level combination corresponding to the vector points, selecting continuous vector points in the same sector to carry out harmonic plane projection vector analysis; and constructing a target function which enables the resultant vector not to contain third and fifth harmonic components, selecting a proper vector point and distributing action time. According to the SVPWM harmonic suppression method, the calculated amount is greatly simplified, the harmonic elimination effect is very remarkable, and the condition of level jump is avoided.

Description

technical field [0001] The invention belongs to the field of multi-phase motor drive control, and in particular relates to a SVPWM harmonic suppression method applied to a nine-phase open-end winding motor, which is suitable for the occasion of optimizing motor control. Background technique [0002] For the open-winding motor, both ends of the stator winding are connected to the inverter. This kind of open-winding motor system has high control flexibility and excellent fault tolerance performance. Many scholars at home and abroad have carried out related research, and most of them focus on zero sequence A study of current inhibition. Different from multi-phase star-connected motors, multi-phase open-winding motor drive systems are more complicated when realizing SVPWM modulation, but there are few studies on it in the existing literature. At present, for the control methods of open-winding motor systems, most of them adopt traditional vector control and direct torque contro...

AI Technical Summary

Problems solved by technology

This method can solve the problems of large amount of calculation of vector points, high content of low-order harmonics and discontinuous pulse signals in the modulation of nine-phase open-winding permanent magnet synchronous motors

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