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Predictive control system and method for reducing common mode voltage of three-level vienna rectifier system

A common-mode voltage, predictive control technology, applied in wind power generation, electrical components, circuit devices, etc., can solve the problems of unbalanced midpoint voltage on the DC side, distortion of zero-crossing current on the AC side, and distorted midpoint voltage on the DC side. Achieve the effects of high output waveform quality, increase power density, reduce voltage stress and AC side current harmonics and common mode current

Active Publication Date: 2019-11-12
SHANDONG UNIV
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Problems solved by technology

[0007] In order to solve the above problems, the present invention proposes a predictive control system and method for reducing the common-mode voltage of the three-level VIENNA rectifier system. The problem of voltage unbalance and the control coupling problem of current zero-crossing distortion on the AC side and unbalanced mid-point voltage on the DC side

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[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0042] 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.

[0043] 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 predictive control system and method for reducing the common-mode voltage of a three-level VIENNA rectifier system, which are used to solve the high common-mode voltage of the three-level VIENNA rectifier system in a wind power generation system, the distortion of the zero-crossing point of the current on the AC side, and the distortion of the current on the DC side. The problem of unbalanced midpoint voltage. This algorithm limits the common mode voltage of the system to a very low range; solves the problem of current zero-crossing distortion and DC midpoint voltage unbalanced control coupling; and greatly reduces the amount of calculation by classifying space voltage vectors. The algorithm does not need the current inner loop controller and PWM modulation module, which avoids the design of complex controller and the selection of complex parameters. It is simple, intuitive and effective, which makes the algorithm have high use value.

Description

technical field [0001] The invention relates to a predictive control system and method for reducing the common-mode voltage of a three-level VIENNA rectifier system. Background technique [0002] Traditional non-renewable energy sources are decreasing day by day, and the energy crisis is severe. At the same time, traditional energy sources are causing more and more environmental pollution problems, which have attracted more and more attention from people all over the world. Renewable energy such as photovoltaic power generation, wind power generation, and biomass power generation have been widely used due to their cleanness and renewable energy. Among them, wind power has great development potential because of its abundant reserves and wide distribution. According to the forecast of the IEA model, by 2020, the global wind power generation will reach 1.569TWh, and by 2050, it will reach 7.541TWh. As the interface circuit between the wind turbine and the power grid or load, ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219H02M7/217H02M1/12H02J3/38
CPCH02J3/386H02M1/12H02M7/2173H02M7/219H02M1/123Y02E10/76
Inventor 张承慧李晓艳邢相洋秦昌伟
Owner SHANDONG UNIV
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