3D-AZSPWM modulation strategy overmodulation method and system for realizing minimum instantaneous error

Abstract

The invention discloses a 3D-AZSPWM modulation strategy overmodulation method and system for realizing minimum instantaneous error, and belongs to the technical field of inverter modulation. The problem of how to calculate the maximum linear modulation degree of the 3D-AZSPWM modulation strategy and widen the modulation range of the 3D-AZSPWM modulation strategy through an overmodulation technology on the premise that the 3D-AZSPWM modulation strategy is not changed and the characteristics of the differential mode component and the common mode component are modulated at same time is solved. The maximum linear modulation degree of the 3D-AZSPWM modulation strategy is obtained through calculation, a spatial modulation body where a spatial modulation reference vector is located is judged, and a corresponding compression plane constraint equation and an output harmonic wave minimization compression scheme constraint equation are combined during overmodulation. While the 3D-AZSPWM modulation strategy is not changed and the characteristics of the differential mode component and the common mode component are modulated at the same time, the instantaneous error of the output voltage vector during overmodulation is kept to be minimum through the overmodulation technology, and the applicability of the 3D-AZSPWM modulation strategy is effectively enhanced.

Description

technical field [0001] The invention belongs to the technical field of inverter modulation, and relates to a 3D-AZSPWM modulation strategy overmodulation method and system with minimum instantaneous error. Background technique [0002] The 3D-AZSPWM modulation (three-dimensional active zero-state pulse width modulation) strategy uses six non-zero basic vectors to synthesize the reference voltage vector, which can simultaneously modulate the differential mode component and common mode component of the reference voltage vector, and can effectively reduce the inverter Therefore, it is widely used in the zero-sequence circulating current control that needs to modulate the common-mode voltage, such as the open-winding topology of the common DC bus and the common-neutral double inverter, and the three-phase four-leg inverter Wait. Compared with the traditional SVPWM modulation strategy that only focuses on differential mode component modulation, the 3D-AZSPWM modulation strategy ...

AI Technical Summary

Problems solved by technology

[0004] In summary, there are the following problems in the prior art: 1) For the 3D-AZSPWM modulation strategy, the prior art only provides the basic synthesis principle and implementation process, but does not give the linear modulation range of the 3D-AZSPWM modulation strategy, that is, the maximum Linear modulation degree; 2) There is no constraint scheme for the overmodulation of the 3D-AZSPWM modulation strategy, so the overmodulation constraint scheme cannot be used to effectively expand the applicable range of the 3D-AZSPWM modulation strategy

Images