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Prediction control method of no-network-voltage sensor of three-phase VIENNA rectifier

A predictive control and rectifier technology, applied in reactive power compensation, AC network voltage adjustment, output power conversion devices, etc., can solve problems such as noise, reduced system reliability, increased system cost and hardware complexity

Active Publication Date: 2020-05-08
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, the grid voltage signal is generally obtained by installing a grid voltage sensor, but installing a grid voltage sensor will not only increase system cost and hardware complexity, reduce system reliability, but also cause problems such as noise and limited resolution.

Method used

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  • Prediction control method of no-network-voltage sensor of three-phase VIENNA rectifier
  • Prediction control method of no-network-voltage sensor of three-phase VIENNA rectifier
  • Prediction control method of no-network-voltage sensor of three-phase VIENNA rectifier

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Embodiment Construction

[0096] The present invention will be described in further detail below in conjunction with embodiment.

[0097] 1. The mathematical model of the VIENNA rectifier in the two-phase stationary coordinate system is deduced by the equivalent method of the three-valued logic switch function

[0098] Such as figure 1 Shown is the topological diagram of the three-phase VIENNA rectifier, E in the figure a ,E b ,E c Respectively A, B, C phase grid voltage, L is the filter inductance, R is the equivalent resistance of the filter inductance and the line, V a , V b , V c are the AC side voltages of A, B, and C phases respectively, and C 1 、C 2 Respectively, the upper and lower filter capacitors on the DC side, R load is a resistive load.

[0099] The mathematical model of the three-phase VIENNA rectifier in the three-phase stationary coordinate system is:

[0100]

[0101] where V ao , V bo , V co Respectively represent the voltage between a, b, c and o, V oN Indicates the...

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Abstract

The invention discloses a prediction control method of a no-network-voltage sensor of a three-phase VIENNA rectifier. The method comprises the following steps: S1, carrying out Clarke transformation on a mathematical model of the three-phase VIENNA rectifier in a three-phase static coordinate system, and establishing the mathematical model of the three-phase VIENNA rectifier in a two-phase staticcoordinate system; S2, estimating a voltage of a power grid by adopting a virtual flux linkage algorithm; S3, replacing an integral term in the step S2 with a second-order low-pass filter; and S4, determining predicted values of ialpha and ibeta at a k+1th moment according to a minimum power tracking error to obtain alternating-current side voltage vectors Valpha and Vbeta, and obtaining a space vector modulation signal. The method has advantages that an actual power grid voltage can be accurately and quickly tracked without a network voltage sensor and a phase-locked loop, same-phase operation of a power grid voltage and current is kept and so on.

Description

technical field [0001] The invention belongs to the technical field of power electronic conversion, and in particular relates to a predictive control method for a three-phase VIENNA rectifier without a grid pressure sensor. Background technique [0002] The VIENNA rectifier is a three-level topology that has lower harmonic content and higher efficiency than two-level rectifiers. Compared with the traditional three-level rectifier, this type of rectifier requires fewer switching devices, the stress on the switching tube is low, and there is no need to set a dead time. It has the advantages of low voltage stress of the power switch, small number of power switches, high power density, low input current harmonic content, and good adaptability to various types of PFC control methods. Therefore, it has been obtained in the research of power factor correction technology. a wide range of applications. [0003] At present, the control strategies of three-phase VIENNA rectifiers are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02J3/12H02J3/16
CPCH02J3/12H02J3/16H02M7/219Y02E40/30
Inventor 李山苏新柱郭强肖蕙蕙陈岚
Owner CHONGQING UNIV OF TECH
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