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Three-level dead time compensation method based on current vector equivalence

A technology of current vector and compensation method, which is applied in the direction of electrical components, output power conversion device, AC power input conversion to DC power output, etc. It can solve problems such as voltage distortion and system harmonic increase, and achieve simple control and anti-interference Good performance and save CPU resources

Active Publication Date: 2016-01-06
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the system harmonic increase and voltage distortion caused by the dead zone effect when the three-level inverter adopts SVPWM modulation, and propose a novel and simple dead zone based on current vector equivalent Zone compensation method to eliminate the influence of dead zone on output voltage

Method used

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  • Three-level dead time compensation method based on current vector equivalence
  • Three-level dead time compensation method based on current vector equivalence
  • Three-level dead time compensation method based on current vector equivalence

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Embodiment Construction

[0023] The present invention will be further described below in combination with specific embodiments.

[0024] The present invention is based on the current vector equivalent three-level dead zone compensation method, such as figure 1 shown, including:

[0025] Step 1. According to the topology of the three-level inverter and the delay time required for the IGBT switch tube to be completely turned on and off, set the dead time T d ;

[0026] Step 2. According to the influence of the delay on the output voltage when the IGBT switch tube and the freewheeling diode are turned on and off, the error voltage △V generated during the dead time is obtained;

[0027] Step 3, the IGBT switch tube is switched under the three states of PON, and the general expression of the error voltage generated under different phase current directions is obtained;

[0028] Step 4. Determine the action interval according to the current direction and sequence state of each phase, and obtain the error ...

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Abstract

The invention discloses a three-level dead time compensation method based on current vector equivalence, so as to solve problems such as system harmonic increase and voltage distortion caused due to dead time effects when SVPWM modulation is adopted for modulation by a three-level inverter. According to the compensation method, through judging the direction of the three-phase current, error voltage generated due to conduction delay of a power device in the case of state switching of a three-phase bridge arm is obtained, synthesis in a two-phase static coordinate system is carried out, and error voltage based on current vector equivalence is obtained. On the basis, a voltage vector opposite to the equivalence is compensated, a reference instruction in the two-phase static coordinate system is rebuilt, dead time effects are offset, the SVPWM modulation output dead time us compensated, and system performance is effectively enhanced.

Description

technical field [0001] The invention relates to the technical field of power electronics and electric drive, in particular to a three-level dead zone compensation method based on current vector equivalent. Background technique [0002] Compared with the traditional two-level inverter, the three-level inverter, due to the increase in the number of levels, reduces the harmonic components of the output voltage, reduces the voltage switching stress of the switching tube, and reduces the system loss. In low-voltage switching devices application is more extensive. In order to prevent the direct current side of the inverter from passing through, it is necessary to add a dead time to the driving signal of the power device. Compared with a switching cycle, the set dead time is relatively short, but its cumulative effect will still lead to voltage and current distortion, zero current clamping effect, and system performance degradation, so it is necessary to compensate for the dead ti...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M7/5395
Inventor 张继元舒杰黄磊王浩
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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