Power factor corrector with active power decoupling function and control method thereof

A power factor correction and control method technology, applied in the electric power field, can solve the problems that the output side of the converter cannot be directly connected to the load equipment, the current of the DC side of the diode full-bridge rectifier is discontinuous, and the negative impact of the power quality of the AC side, etc., to achieve the control method Simple and reliable, avoiding command generation and tracking, and improving system reliability

Active Publication Date: 2019-01-11
XI AN JIAOTONG UNIV
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Problems solved by technology

However, there is an inherent problem in the single-phase AC-DC energy conversion system: the instantaneous power injected into the converter from the AC grid side includes the power fluctuation component of twice the power frequency in addition to the stable DC power component
The power fluctuation of twice the power frequency will cause the output voltage on the DC side of the converter to produce obvious double power frequency voltage ripple, so the output side of the converter cannot be directly connected to the load device
(Existing literature Yao Sun, Yonglu Liu, Mei Su, Wenjing Xiong and Jian Yang, "Review of Active Power D...

Method used

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  • Power factor corrector with active power decoupling function and control method thereof
  • Power factor corrector with active power decoupling function and control method thereof
  • Power factor corrector with active power decoupling function and control method thereof

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] The key idea of ​​the present invention is to add power MOSFETs, diodes and capacitive elements to the topology of the original power factor correction converter, and transfer the power fluctuations to the buffer capacitor through modeling and control of the converter, so as to realize power factor correction on the AC side And a stable output voltage on the DC side.

[0033] Such as figure 1 As shown, a circuit topology of a non-isolated single-stage step-up power factor correction converter that can realize active power decoupling, including the input power supply v ac , a set of diode full-bridge rectifiers, two MOSFET power tubes Q a and Q b , two diodes D a and D b , snubber capacitor C f , the output capacitance C o , an inductor L and a load resistor R. Where MOSFET power tube Q a , Diode D a and snubber capacitor C f...

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Abstract

The invention discloses a power factor corrector with an active power decoupling function and a control method thereof, Based on the current topology of step-up power factor correction converter, a buffering circuit is added to control the AC side current waveform and DC side output voltage directly, and the power fluctuation of double power frequency is transferred to the buffering capacitor automatically. The control objectives of correcting power factor and stabilizing output voltage are realized. The requirement of the converter for capacitor device is effectively reduced and the electrolytic capacitor is replaced by thin film capacitor, so the power density, service life and reliability of the converter are improved. At the same time, the proposed converter is based on step-up topology, and the DC-side current of diode full-bridge rectifier is continuous. Compared with the converter based on step-down topology and step-up-buck topology, the proposed converter has the advantages oflower AC-side high-frequency harmonic components and simplified filter design.

Description

technical field [0001] The invention belongs to the field of electric power technology, and in particular relates to a power factor corrector with an active power decoupling function and a control method thereof. Background technique [0002] Single-phase AC-DC converter, as an interface device between single-phase AC grid and DC load, undertakes the responsibility of single-phase AC-DC power conversion and provides stable energy for electrical equipment, and has a wide range of applications in modern social life. In order to ensure the power quality of the single-phase AC grid, the single-phase AC-DC converter often needs to have the ability to realize power factor correction, and eliminate the low-order harmonics of the AC current while ensuring that the fundamental wave of the grid-side AC current is in phase with the AC voltage ingredients. However, there is an inherent problem in the single-phase AC-DC energy conversion system: the instantaneous power injected into the...

Claims

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Application Information

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IPC IPC(8): H02M1/42H02M1/12H02M7/217
CPCH02M1/12H02M1/4225H02M7/217Y02B70/10
Inventor 张岩丁恺诚刘进军张金水
Owner XI AN JIAOTONG UNIV
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