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A two-level three-phase space vector pulse width modulator and its svpwm optimization method

A technology of pulse width modulation and space vector, which is applied in the direction of vector control system, control of electromechanical brake, motor generator control, etc. It can solve the problems of performance degradation of overmodulation algorithm, reduction of voltage space range, reduction of actual linear modulation area, etc.

Inactive Publication Date: 2015-12-02
SOUTH CHINA UNIV OF TECH
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  • Claims
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Problems solved by technology

The dead time and narrow pulse width limit narrow the actual reachable voltage space range, which makes the actual linear modulation area narrow, and the performance of the currently proposed overmodulation algorithm is greatly reduced.

Method used

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  • A two-level three-phase space vector pulse width modulator and its svpwm optimization method
  • A two-level three-phase space vector pulse width modulator and its svpwm optimization method
  • A two-level three-phase space vector pulse width modulator and its svpwm optimization method

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Embodiment Construction

[0055] The present invention will be further described below in conjunction with specific examples.

[0056] This embodiment discloses a two-level three-phase space vector pulse width modulator and its SVPWM optimization method considering dead zone and narrow pulse width limitation, taking into account the influence of dead zone time and narrow pulse width limitation, the most convenient The method realizes the full utilization of the bus voltage, improves the linearity of the output fundamental voltage relative to the reference voltage, and reduces the total harmonic distortion of the output voltage.

[0057] like figure 1 As shown, the two-level three-phase space vector pulse width modulator described in this embodiment includes a given reference voltage correction module 1, a voltage coordinate transformation module 2, a voltage interval calculation module 3, a vector time calculation module 4, a modulation Algorithm optimization module 5, PWM comparison point time calcu...

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Abstract

The invention discloses a two-level three-phase space vector pulse-width modulation device and an SVPWM optimization method thereof. Aiming at influence of dead-zone time and narrow pulse-width limit, a practical linear modulation zone is expanded, an over-modulation algorithm is optimized and linear processing of an over-modulation zone is simply realized. The two-level three-phase space vector pulse-width modulation device comprises six modules of a given reference voltage correction module, a voltage coordinate transformation module, a voltage interval calculating module, a vector time calculating module, a modulation algorithm optimization module and a PWM comparison point time calculating module. Bus voltage is fully utilized via the simplest algorithm so that linearity of output fundamental wave voltage is enhanced and total harmonic wave distortion of the output voltage is reduced.

Description

technical field [0001] The invention relates to the technical field of AC motor control, in particular to a two-level three-phase space vector pulse width modulator and its SVPWM optimization method considering dead zone and narrow pulse width limitation. Background technique [0002] Pulse width modulation (PWM, pulsewidthmodulation) is an important part of the motor control system. Due to the characteristics of high voltage utilization, low voltage harmonics and easy digital implementation of vector pulse width modulation (SVPWM, spacevectorPWM) technology, it is widely used in motor vector control. [0003] In a two-level three-phase inverter system, the eight states of the switching tube can generate six basic voltage vectors v 1 / v 2 / … / v 6 and 2 zero vectors v 0 / v 7 , the regular hexagonal area (including the boundary) formed by the basic voltage vector is the range (voltage space) that the output voltage can reach. Any voltage vector in the voltage space can be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00
Inventor 黄招彬文小琴游林儒汪兆栋
Owner SOUTH CHINA UNIV OF TECH
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