Current predication control method based on single-phase Vienna rectifier

A technology of current prediction and control method

Inactive Publication Date: 2017-06-13
CHINA THREE GORGES UNIV
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  • Abstract
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Problems solved by technology

[0004] In view of the above-mentioned problems and deficiencies, the present invention proposes a current prediction control method based on single-phase Vienna rectifiers, which can eliminate the error caus

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  • Current predication control method based on single-phase Vienna rectifier
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  • Current predication control method based on single-phase Vienna rectifier

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Embodiment Construction

[0066] The present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto. A kind of current predictive control method based on single-phase Vienna rectifier, comprises the steps:

[0067] Step (1): Deduce the circuit equation and discrete state equation of the single-phase rectifier according to Kirchhoff's law and the topology of the single-phase Vienna rectifier.

[0068] Step (2): Collect DC side capacitor voltage U C1 , U C2 , AC side current i(k) and power supply voltage U at time K s , the measured DC side voltage U C1 , U C2 Do the sum operation to get the total voltage U of the DC side dc , and put U dc and the reference value U of the total voltage on the DC side dc_ref The error signal is obtained by comparison, and the error signal is obtained by the PI controller to obtain the reference current amplitude I * .

[0069] Step (3):...

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Abstract

The invention provides a current predication control method based on a single-phase Vienna rectifier. The method comprises the following steps: firstly, deducing a circuit equation of the single-phase Vienna rectifier according to Kirchoff's laws and a single-phase Vienna rectifier topological structure; carrying out discrete treatment on the obtained circuit equation to obtain a single-phase Vienna rectifier discrete state equation; calculating a TS(K+2) moment current reference value by utilizing a two-ordered Lagrange's interpolation method and estimating a power grid voltage sampling value by utilizing a linear extrapolation forecasting method; predicating reference current and a periodic average error to obtain next-beat output current; finally, predicating three components to obtain next-beat predicated reference voltage UaN. By adopting the control method provided by the invention, errors caused by delaying control can be eliminated as much as possible, and influences, caused by the delaying control, on current control are improved, so that third-order harmonic and total harmonic distortion problems of power grid current are effectively solved.

Description

technical field [0001] The invention belongs to the field of Vienna rectifiers, in particular to a current predictive control method based on a single-phase Vienna rectifier. Background technique [0002] The Vienna rectifier is an effective means to control the harmonic pollution of the power grid and improve the power quality. It can reduce the harmonic content in the power grid and improve the power factor. The Vienna rectifier was proposed by scholars such as Kolar J.W. of the University of Vienna in 1994. The rectifier was first used to improve the power density of communication power supplies. Compared with the traditional rectifier topology with power factor corrector (PFC) function, the Vienna rectifier topology has a relatively simple power and control circuit, has good input current harmonic and output voltage ripple performance, and has The advantages of low source device stress, high efficiency and high power density have been widely used. The invention studies...

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Application Information

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IPC IPC(8): H02M7/217
CPCH02M7/2176
Inventor 马辉危伟官轲鄢圣阳
Owner CHINA THREE GORGES UNIV
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