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Dead zone compensation method used in voltage space vector pulse width modulation technology

A technology of voltage space vector and dead zone compensation, applied in the field of dead zone compensation, can solve problems such as increasing the amount of computation and reducing system execution efficiency

Inactive Publication Date: 2012-07-11
CSIC ELECTRICAL MACHINERY SCI & TECH +2
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Problems solved by technology

However, this method needs to correct each PWM pulse width in each carrier cycle, which greatly increases the amount of calculation of the CPU and reduces the execution efficiency of the system.

Method used

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  • Dead zone compensation method used in voltage space vector pulse width modulation technology
  • Dead zone compensation method used in voltage space vector pulse width modulation technology
  • Dead zone compensation method used in voltage space vector pulse width modulation technology

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Embodiment Construction

[0020] In order to illustrate the specific implementation of the present invention, let the conduction of the upper bridge arm be 1, and the conduction of the lower bridge arm be 0. Among them, the division of the voltage sector is as follows figure 2 As shown, 6 effective voltage space vectors divide a working cycle of the inverter into 6 areas, which are 0-5 sectors respectively.

[0021] Concrete implementation steps of the present invention are as follows:

[0022] Step 1: Output the current I to the three-phase inverter through the current sensor A , I B , I C Sampling is performed and the polarity of the three-phase current is judged.

[0023] Step 2: According to the polarity of the current three-phase current, the dead time T caused by the dead time effect in the carrier cycle is extra compared with the ideal situation d That effective space vector of length.

[0024] with I A >0, I B C d Time, the upper bridge arm of bridge 2 is turned on more than the dead zo...

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Abstract

The invention relates to a dead zone compensation method used in voltage space vector pulse width modulation technology, belonging to the technical field of power electronics. The dead zone compensation method comprises the following steps of: firstly, acquiring three phases of output current IA, IB and IC of an inverter by a phase current sampling circuit, and judging polarities of the current; secondly, deducing a voltage space vector of a Td dead zone time length in a carrier period according to the polarities of the current three phases of current, wherein the voltage space vector is caused by a dead zone effect and is extra compared with that of an ideal condition; thirdly, obtaining a relationship between two effective voltage space vectors and the extra voltage space vector in the current voltage sector according to relationships of positions and sizes of six effective voltage space vectors in a 360-degree interval; and fourthly, correcting PWM (Pulse Width Modulation) pulse width output by SVPWM (Space Vector Pulse Width Modulation) according to the relationships. The method is used for correcting partial PWM pulse width in each carrier period without excessive calculations, is simple and feasible, and easy to realize, thus operation time of a CPU is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of power electronics and relates to a dead zone compensation method used in voltage space vector pulse width modulation technology. Background technique [0002] When analyzing the working principle of the inverter controlled by PWM, the power switching device in the inverter is considered as an ideal switch, that is, the turning on and off of the power switching device is considered to be without delay. But the actual situation is that it takes a certain amount of time for each switching device to turn on and off, and the turn-off time is longer than the turn-on time, that is, when one switching device in the same bridge arm is not completely turned off, the other switching device has already been turned off. In the case of conduction, the upper and lower bridge arms of the inverter are directly damaged. Therefore, in the design of the inverter, in order to prevent the shoot-through phenomenon of the upper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/5387
Inventor 王震宇许连丙姜铭张爱玲常国梅兰建军马原青李保来
Owner CSIC ELECTRICAL MACHINERY SCI & TECH
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