Improved model predicted control method of three-phase three-level eight-switch rectifier

An improved model and eight-switch technology, applied in wind power generation, electrical components, output power conversion devices, etc., can solve problems such as current distortion and common-mode voltage on the AC side, reduce AC current harmonics and common-mode voltage, and control Simple, EMI reduction effect

Inactive Publication Date: 2019-08-02
YANTAI UNIV
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Problems solved by technology

[0008] In order to solve the problems of AC side current distortion and large common-mode voltage caused by AC side voltage unbalance in the above-mentioned wind power generation occasions, the present invention proposes an improved The model predicts the direct current control method, which maintains the stability of the DC side voltage when the AC side voltage is unbalanced, and at the same time accurately tracks the AC side current, reduces the harmonics of the AC side current and reduces the common mode voltage

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  • Improved model predicted control method of three-phase three-level eight-switch rectifier
  • Improved model predicted control method of three-phase three-level eight-switch rectifier
  • Improved model predicted control method of three-phase three-level eight-switch rectifier

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[0059] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0060] 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.

[0061] 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 an improved model predicted control method. A voltage and a 90-degree delayed signal thereof are used in an alphabeta static coordinate system, and a rectifier leg voltage reference value is obtained via a mathematical model of the three-phase three-level eight-switch NPC rectifier, nine spatial voltage vectors of the three-phase three-level eight-switch NPC rectifier are reduced to seven voltage vectors by removing voltage vectors causing a high common-mode voltage; according to an objective function, an optimal spatial voltage vector enabling the optimal objective function is selected; and the obtained optimal spatial voltage vector serves as a switch function of a next control period, the state of a switch tube is controlled, the operation state of the circuit iscontrolled, and a control target of three-phase there-level eight switches in the wind power generation system under the AC input voltage unbalanced condition is achieved. The algorithm is simple, visual and clear, control is simple and accurate, and the practical value is high.

Description

technical field [0001] The invention relates to the control field of power electronic converters, in particular to a model predictive control method for a three-phase three-level eight-switch rectifier when the three-phase AC voltage is unbalanced. Background technique [0002] Traditional diode uncontrolled rectifier circuits and thyristor phase-controlled rectifier circuits have low power factors and high harmonic content, which inject a large amount of harmonics and reactive power into the AC side current. It poses severe challenges to the safe, stable and efficient operation of wind turbines. [0003] In recent years, multilevel converters are attracting more and more attention because of their advantages in suppressing harmonics, improving power factor, and reducing voltage stress, and have been widely used in industries. The current common types of multilevel converters are: cascaded H-bridge multilevel converters, flying capacitor multilevel converters and neutral po...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/12
CPCH02M1/12H02M7/219H02M1/123Y02E10/76
Inventor 刘兆伟朱阳
Owner YANTAI UNIV
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