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A Space Vector Pulse Width Modulation Method Based on Mapping Theory

A technology of pulse width modulation and space vector, which is applied in the direction of converting irreversible DC power input into AC power output, and can solve the problems of complex implementation and poor readability

Active Publication Date: 2016-03-30
BEIJING MECHANICAL EQUIP INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a space vector pulse width modulation method based on the mapping principle to solve the problems of complex implementation and poor readability of traditional calculation methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0052] The specific steps of a space vector pulse width modulation method based on the mapping principle are:

[0053] The first step is to build a space vector inverter system

[0054] Space vector inverter system, including: DC power supply, three-phase bridge inverter, controller and drive circuit. The DC power supply is a battery or a supercapacitor, and the three-phase bridge inverter is composed of six controllable switching devices. The space vector module runs in the controller. The function of the space vector module is: calculate the three-phase bridge inverter according to the input voltage vector The duty cycle of each phase of the inverter. The positive and negative poles of the DC power supply are connected to the positive and negative poles of the DC bus of the three-phase bridge inverter, the output end of the drive circuit is connected to the control signal input end of the three-phase bridge inverter, and the output end of the controller is connected to the ...

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Abstract

The invention discloses a mapping principle-based space vector pulse-width modulation method. The method comprises the following steps of conducting per-unit treatment of a space vector in a given actual size based on the output range of a three-phase bridge-type inverter; projecting a given voltage vector into a three-phase static coordinate system by using the mapping principle; conducting nonnegative treatment of a three-phase voltage duty ratio by employing a zero vector superimposing mode; reducing three-phase voltage in an equal proportional manner when the given voltage vector exceeds the non-linear output range of the three-phase inverter; and superposing zero vectors in an equal proportional manner so as to realize a standard seven-segment space vector pulse-width modulation effect. The method does not need sector determination and is convenient in program realization and high in readability; and the method can conveniently realize the improved space vector pulse-width modulation method.

Description

technical field [0001] The invention relates to a space vector pulse width modulation method, in particular to a space vector pulse width modulation method based on the mapping principle. Background technique [0002] The space vector pulse width modulation method is a commonly used pulse width modulation method in the three-phase voltage inverter. The space vector pulse width modulation method is based on the principle of "volt-second equivalent", using the six non-zero vectors of the inverter and 2 zero vectors to synthesize any voltage vector within the 6 sectors. [0003] The traditional space vector pulse width modulation method first needs to judge the sector of the voltage vector, and then decompose the voltage vector into two adjacent non-zero vectors corresponding to the sector, and then calculate the action time of the non-zero vector, and The zero vector is set according to whether the calculated action time exceeds the period of the pulse width modulation method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48
Inventor 李毅拓李建冬
Owner BEIJING MECHANICAL EQUIP INST