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Neutral-point potential balance control device and method for three-level inverter

A three-level inverter and potential balancing technology, which is applied in the direction of output power conversion device, electrical components, AC power input conversion to DC power output, etc., can solve the problem of adding a large number of components, unbalanced midpoint voltage, and cost increase and other problems, to achieve the effect of simple structure and control, suppression of midpoint potential shift, and improvement of stability

Inactive Publication Date: 2012-12-26
江苏中航动力控制有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There is an inherent disadvantage of the three-level inverter, that is, there is a problem of unbalanced midpoint voltage
Suppressing the midpoint potential shift from the software alone will increase the complexity of the control
Suppressing the midpoint potential balance only from the perspective of hardware will increase a large number of components and increase the cost

Method used

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  • Neutral-point potential balance control device and method for three-level inverter
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  • Neutral-point potential balance control device and method for three-level inverter

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation examples.

[0036] figure 1 It is a block diagram of the system structure of the three-level inverter mid-point balance control device described in this embodiment, as shown in figure 1 As shown, the three-level inverter midpoint balance control device of the present invention includes: a voltage acquisition unit 101, a proportional-integral control unit 102, a pulse width control unit 103, and a voltage regulation unit 104, wherein the above-mentioned units are connected accordingly .

[0037] The voltage acquisition unit 101 is used to acquire the capacitor voltage on the bus and the capacitor voltage under the bus, and the input terminal of the voltage acquisition unit is connected to the bus bar and the midpoint terminal of the bus bar of the three-level inverter;

[0038] A proportional-integral control unit 102, configured to perform pr...

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Abstract

The invention is suitable for the field of power electronics, and relates to a neutral-point potential balance control device and method for a three-level inverter. The device comprises a voltage acquisition unit, a proportional-integral control unit, a pulse width control unit and a voltage regulating unit. According to the neutral-point potential balance control device provided by the invention, a control quantity is generated by detecting capacitor voltages above and below a bus in real time and performing proportional-integral control processing, and the pulse width modulation duty ratio of a voltage regulating unit power tube is regulated according to the control quantity. The neutral-point potential balance control device is simple in structure, and is easy and convenient for control realization; and a control effect is irrelevant to the modulation ratio and power factor of an inversion system, and neutral-point potential can be controlled in a relatively small range.

Description

technical field [0001] The invention belongs to the field of power electronics, and relates to a control device and method for midpoint potential balance of a three-level inverter. Background technique [0002] The three-level inverter has the advantages of compact structure, low harmonic content of output voltage and current, and the voltage borne by the switching tube is only half of the DC bus voltage. Therefore, it is widely used in medium and high voltage and high power occasions. [0003] There is an inherent disadvantage of the three-level inverter, that is, there is a problem of unbalanced midpoint voltage. The unbalanced midpoint voltage will cause serious harm: the output voltage waveform of the inverter is distorted; the voltage borne by the switching device is unbalanced; the voltage fluctuation of the DC side capacitor reduces the life of the capacitor. In order for the inverter to work normally, efforts should be made to keep the midpoint voltage balanced. ...

Claims

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Application Information

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IPC IPC(8): H02M7/483
Inventor 王律明张志红陈东
Owner 江苏中航动力控制有限公司
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