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Overmodulation output maximization method and system for 3D-SVPWM modulation strategy

A 3D-SVPWM, over-modulation technology, applied in control systems, vector control systems, control of electromechanical brakes, etc., can solve large linear modulation, expand the scope of application of 3D-SVPWM modulation strategy, no 3D-SVPWM modulation strategy is given Constraint scheme and other issues to achieve the effect of increasing the modulation range and maximizing the over-modulation output

Active Publication Date: 2021-09-07
HEFEI UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] To sum up, the existing technology has the following problems: 1) For the 3D-SVPWM modulation strategy, the prior art only provides the basic synthesis principle and implementation process, and does not give the linear modulation range of the 3D-SVPWM modulation strategy, that is, the maximum Linear modulation degree; 2) There is no constraint scheme for the overmodulation of the 3D-SVPWM modulation strategy, so the overmodulation constraint scheme cannot be used to effectively expand the scope of application of the 3D-SVPWM modulation strategy

Method used

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  • Overmodulation output maximization method and system for 3D-SVPWM modulation strategy

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Embodiment 1

[0088] figure 1 It is the topology structure of the three-phase two-level voltage inverter involved in the present invention. It can be seen from the figure that the topology structure of the common-neutral open-winding electric drive system involved in this strategy includes the first DC source U dc1 , the second DC source U dc2 , the first three-phase two-level inverter VSI1, the second three-phase two-level inverter VSI2, three-phase stator winding OEWIM, neutral line I, capacitor C1, capacitor C2, capacitor C3 and capacitor C4;

[0089] The capacitor C1 and the capacitor C2 are connected in series to the first DC source U dc1 Between the DC positive bus P and the DC negative bus N, the common node of capacitor C1 and capacitor C2 is marked as point O; the capacitor C3 and capacitor C4 are connected in series to the second DC source U dc2 Between the DC positive bus P' and the DC negative bus N', the common node of capacitor C3 and capacitor C4 is marked as point O', the ...

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Abstract

The invention discloses an overmodulation output maximization method and system for a 3D-SVPWM modulation strategy, and belongs to the technical field of inverter modulation. The problem of how to calculate the maximum linear modulation degree of the 3D-SVPWM modulation strategy and widen the modulation range of the 3D-SVPWM modulation strategy through an overmodulation technology on the premise that the 3D-SVPWM 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-SVPWM 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. On the premise that the 3D-SVPWM modulation strategy is not changed and the characteristics of the differential mode component and the common mode component are modulated at the same time, through the overmodulation technology, a modulation instruction is effectively followed, the overmodulation output is maximized, and the modulation range of the 3D-SVPWM modulation strategy is widened.

Description

technical field [0001] The invention belongs to the technical field of inverter modulation, and relates to a method and system for maximizing overmodulation output of a 3D-SVPWM modulation strategy. Background technique [0002] The 3D-SVPWM modulation (three-dimensional space vector pulse width modulation) strategy can simultaneously modulate the differential mode component and the common mode component of the reference voltage vector, so it is widely used in zero-sequence circulating current control that needs to modulate the common mode voltage, such as common DC Busbar and common neutral double inverter open winding topology, three-phase four-leg inverter, etc. Compared with the traditional SVPWM modulation strategy that only focuses on differential mode component modulation, the 3D-SVPWM modulation strategy has a limited output range of differential mode component modulation due to simultaneous modulation of common mode components. Therefore, it is urgent to calculate t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5395H02M7/5387H02M1/12H02P27/12H02P21/28H02P21/00H02P21/14H02P25/024H02P27/02
CPCH02M7/5395H02M7/53875H02M1/12H02P27/12H02P21/28H02P21/0089H02P21/0003H02P21/14H02P25/024H02P27/02
Inventor 杨淑英王顺张兴谢震刘芳
Owner HEFEI UNIV OF TECH
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