Midpoint potential balance control method suitable for VIENNA rectifier

A technology of potential balance and control method, which is applied in the direction of electrical components, high-efficiency power electronic conversion, output power conversion devices, etc., can solve the problems of poor midpoint potential suppression effect and high harmonic content of input side current, and achieve stable midpoint The effect of potential fluctuation, voltage stability, fast and smooth control

Active Publication Date: 2019-03-19
JIANGSU UNIV
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Problems solved by technology

However, the suppression effect of the midpoint potential is poor, and the harmonic content of the input side current is high

Method used

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  • Midpoint potential balance control method suitable for VIENNA rectifier
  • Midpoint potential balance control method suitable for VIENNA rectifier
  • Midpoint potential balance control method suitable for VIENNA rectifier

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0034] Such as figure 1 Shown is the schematic diagram of the VIENNA rectifier (three-phase three-switch rectifier). The present invention takes the VIENNA rectifier as the controlled object. Through the analysis of the differential equations set up in the schematic diagram, it can be known that the potential imbalance of the rectifier midpoint is due to the input of the midpoint within a unit time. The amount of charge is not 0 so that the voltages of the two capacitors on the output side are not equal. In this paper, by combining the principle of space vector modulation to analyze the operation ...

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Abstract

The invention discloses a midpoint potential balance control method suitable for a VIENNA rectifier. The working principle of the VIENNA rectifier is analyzed, and the principle of space vector modulation is used to analyze a carrier phase shift modulation process, so as to determine the cause of midpoint potential imbalance. Finally, according to an area equivalence principle, high-frequency PWMXOR control pulse is used to decompose redundant and non-redundant vector components. A midpoint potential compensation coefficient D is set to adjust the decomposition ratio to ensure midpoint potential balance. Midpoint potential balance control of the VIENNA rectifier is realized. According to the invention, midpoint potential fluctuations are stabilized; the output voltage of the direct current side is stabilized; current distortion on the grid side is reduced; and the principles are simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a midpoint potential balance control method suitable for a VIENNA rectifier. Background technique [0002] Nonlinear components inject a large number of harmonics into the power grid, and severe current distortion can lead to equipment failure or even system collapse. Therefore, rectifiers with power factor correction functions are widely used in power electronic equipment. With the urgent demand for high power quality and power density rectifiers, the three-level VIENNA rectifier has become a research hotspot at home and abroad in recent years. It can not only realize input unit power factor correction, but also has small harmonics, low switching loss and small electromagnetic interference. Advantages, and the circuit structure is simple, the number of switches is small and there is no bridge arm through problem. In essence, the VIENNA rectifier belongs to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/12H02M7/219H02M1/14
CPCH02M1/14H02M7/12H02M7/219H02M1/0048H02M7/4833Y02B70/10
Inventor 李正明孔茗王满商
Owner JIANGSU UNIV
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