Three-level VIENNA rectifier model prediction system and method under power grid unbalanced condition

A power grid imbalance and model prediction technology, applied to electrical components, instruments, circuit devices, etc., can solve the problems of many controller parameters, complex design, and large amount of calculation, and achieve the effect of precise control, simple control, and simple algorithm

Active Publication Date: 2018-12-11
SHANDONG UNIV
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Problems solved by technology

[0012] The method proposed above has a large amount of calculation for the control method of the three-phase three-level VIENNA rectifier under t

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  • Three-level VIENNA rectifier model prediction system and method under power grid unbalanced condition
  • Three-level VIENNA rectifier model prediction system and method under power grid unbalanced condition
  • Three-level VIENNA rectifier model prediction system and method under power grid unbalanced condition

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[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0044] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinatio...

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Abstract

The invention discloses a three-level VIENNA rectifier model prediction control system and method under a power grid unbalanced condition. The invention solves problems of the calculation of referencecurrent when the power network is unbalanced; the balance control of dc side voltage and DC side neutral point voltage; three-phase current zero-crossing distortion; control of unit power factor of grid current. The algorithm divides 25 voltage vectors into 6 sectors according to the current direction and 8 voltage vectors in each sector. Then five voltage vectors are selected according to the deviation of the neutral point voltage, and the optimal space voltage vector is obtained according to the value function, and the optimal space voltage vector controls the state of the switch transistor, so as to realize the control of the three-phase three-level VIENNA rectifier. The algorithm does not require the separation of positive and negative sequence of voltage and current, phase lock of voltage, current inner loop control module and modulation module when the power network is unbalanced.

Description

technical field [0001] The invention relates to a three-level VIENNA rectifier model prediction system and method under unbalanced power grid conditions. Background technique [0002] Traditional diode uncontrolled rectifier circuits and thyristor phase-controlled rectifier circuits have low power factor and high harmonic content, which inject a large amount of harmonics and reactive power into the grid. It has caused serious pollution to the large power grid and reduced the power quality of the power grid. The three-level Vienna rectifier has the advantages of high grid-connected current waveform quality, low harmonic content, high power density, high withstand voltage level, no need to consider dead zones, and fewer switching devices, and has been widely used. However, the particularity of the topological structure of the three-level Vienna rectifier leads to inherent problems such as zero-crossing distortion of the three-phase current and balance with the midpoint potent...

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Application Information

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IPC IPC(8): H02M7/155H02J3/00G06F17/50
CPCG06F30/367H02J3/00H02J2203/20H02M7/155
Inventor 张承慧李晓艳邢相洋秦昌伟
Owner SHANDONG UNIV
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