Double-frequency single-phase PWM rectifier

A rectifier, single-phase technology, applied in the field of dual-frequency single-phase PWM rectifier, can solve the problems of many components, high cost, high switching frequency of power devices, improve efficiency and power density, simplify control difficulty, and reduce inductance volume. Effect

Active Publication Date: 2018-01-23
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of designing the controller, it is necessary to measure and feed back the state of the filter, and accurately adjust the parameters of the controller, otherwise the expected control effect cannot be achieved
Therefore, the main problems of the LCL PWM single-phase rectifier are many components, large volume, high cost, complex structure, and difficult control.
[0006] It can be seen that although the L-type and LCL-type single-phase PWM rectifiers can achieve harmonic suppression, they both have the disadvantages of large size and high cost. Improving the Efficiency of PWM Rectifiers

Method used

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  • Double-frequency single-phase PWM rectifier
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  • Double-frequency single-phase PWM rectifier

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, wherein the schematic embodiments and descriptions are only used to explain the present invention, but are not intended to limit the present invention.

[0017] Such as figure 1 As shown, a dual-frequency single-phase PWM rectifier described in this specific embodiment includes a housing, and a circuit board is arranged in the housing, and the circuit board includes a control unit and a main circuit unit; the main circuit unit Consists of a low frequency power unit and a high frequency harmonic elimination unit;

[0018] The low-frequency power unit includes four fully-controlled switching devices (VT1-VT4), four power diodes (VD1-VD4) and filter capacitor C1; the VT1 is connected in series with VT2, and VT3 and VT4 are connected in series, all of which are connected in two On the power transmission wires, the output ends of the two power tran...

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Abstract

The invention relates to the technical field of rectifiers, and particularly relates to a double-frequency single-phase PWM rectifier comprising a shell which is internally provided with a circuit board. The circuit board comprises a control unit and a main loop unit. The main loop unit is composed of a low frequency power unit and a high frequency harmonic elimination unit. The required inductance of the power filter can be reduced through the novel topological structure so that the inductor size can be reduced, the cost of the PWM rectifier can be reduced, the control difficulty of the PWM rectifier can be simplified, the switching frequency of the high power switching device can be reduced and the efficiency and the power density of the rectifier can be enhanced.

Description

【Technical field】 [0001] The invention relates to the technical field of rectifiers, in particular to a dual-frequency single-phase PWM rectifier. 【Background technique】 [0002] PWM rectifier technology is the main technology for converting AC power into DC power, and generally requires the use of self-shutdown power devices. Since the AC side current of the PWM rectifier contains harmonic components, and the power grid has strict requirements on current harmonics, it is necessary to take measures to suppress the current harmonics to reduce the pollution to the power grid. At the same time, in order to reduce the loss of the PWM rectifier, it is hoped to reduce the switching frequency of the power device. The lower the switching frequency, the smaller the loss, but the greater the harmonic. [0003] At present, the method of adding a power filter on the AC side is mainly used to suppress the current harmonics of the PWM rectifier. According to the different filters, it can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/12H02M1/15
Inventor 杨立永刘硕景生赟刘启帆王元韩硕王云昊
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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