Single-phase power factor corrector for direct grid-side power control

Abstract

The invention provides a single-phase power factor corrector in direct network-side power control. The single-phase power factor corrector comprises a power circuit, an auxiliary circuit and a control module, wherein the power circuit is used for completing single-phase AC-DC (Alternating Current-Direct Current) power conversion; the auxiliary circuit is connected with the power circuit, and is used for completing the instant detection of input voltage, input current and output voltage and the driving of an original PWM (Pulse-Width Modulation) pulse and outputting measured electric quantity to the control module; and the control module is used for carrying out digital operation and logical processing according to direct power control and a single-period control principle after various detection electric quantities of the auxiliary circuit are received, obtaining an original driving pulse, and finally completing power factor correction by virtue of the power circuit and outputting stable DC voltage. According to the single-phase power factor corrector provided by the invention, the single-phase AC-DC conversion of a network-side unit power factor is realized, and the single-phase power factor corrector has the advantages of quick response speed, strong anti-jamming capacity, capability of adapting to load change in a wider range and load following characteristics, and is an ideal single-phase power factor correction scheme.

Description

technical field [0001] The present invention relates to a single-phase power factor corrector (PFC) in the technical field of power electronic conversion, in particular to a single-phase power factor corrector with direct grid-side power control. Background technique [0002] In order to suppress the harmonic current generated by the single-phase AC-DC converter using the rectifier bridge, reduce the harmonic current interference, and make it meet the harmonic current standard, a single-phase active power factor correction (PFC) technology is required. Single-phase active power factor correction technology has a variety of control strategies, such as double closed-loop control, single-cycle control, etc., and can obtain good correction results. Among them, the single-phase active PFC with single-cycle control has good power factor correction effect, fast dynamic response and strong robustness. But in principle, the single-cycle control does not involve the voltage outer loo...

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Problems solved by technology

[0006] [2] Hu Zongbo and Zhang Bo et al. "Theoretical Analysis and Experimental Verification of Single-Cycle Control Applicability of BOOST Power Factor Correction Converter". Chinese Journal of Electrical Engineering. V25, No.21, 2005.11: 19-23; its main technical features are as follows : The voltage error amplifier is used as the voltage outer loop, the response speed is affected, and the advantages of single-cycle control are not fully utilized;

[0007] [3] He Zhiyuan and Wei Wei. "Research on Direct Power Control of PWM Rectifier Based on Virtual Flux Linkage". Journal of Zhejiang University. V38, No.12, 2004.11: 1619-1622; its main technical characteristics are as follows: three-phase rectifier, response speed Fast, but due to the use of bang control, it brings sudden changes in switching frequency and introduces disturbance and noise, which reduces the reliability of the system and even deteriorates the performance of the system

[0008] Based on the above, the search for the prior art of single-phase active power factor correctors found that single-cycle control and direct power control have the advantages of fast response, but the outer voltage loop limits the single-cycle response speed, and the switching frequency of traditional direct power control Potential instability of the system due to drastic changes

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