Net current sinusoidal single-phase ac-dc conversion circuit
A conversion circuit, single-phase technology, applied in the field of single-phase AC-DC conversion circuit, can solve the problems of lack of feedback control strategy, power grid power quality pollution, reducing system reliability, etc., to achieve novel and efficient power circuit, accurate and flexible control circuit , the effect of novel structure
Inactive Publication Date: 2019-08-23
SHANGHAI JIAOTONG UNIV
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[0005] [2] He Zhiyuan and Wei Wei. "Research on Directional 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, voltage error The amplifier is used as the voltage outer loop controller, but because of the popping control, the sudden change of the switching frequency brings disturbance and noise, which reduces the reliability of the system and even deteriorates the performance of the system
[0006] Based on the above, the retrieval of the existing technologies of single-phase AC-DC converters found that the traditional single-phase AC-DC conversion circuit lacks a feedback control strategy to better deal with grid voltage distortion, and there is a bad phenomenon of harmonic current injection into the grid, resulting in Pollution of Power Quality in Grid
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[0040] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0041] Such as figure 1 with figure 2 As shown, this embodiment provides a sinusoidal network current single-phase AC-DC conversion circuit, including a control circuit and a power circuit, wherein: the control circuit is used to complete instantaneous detection and AD conversion of the output voltage and grid voltage, And according to the voltage outer loop control principle, the output voltage and the grid voltage are subjected to analog calculation, digital calculation and logic processing to...
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The invention provides a network flow sine single-phase AC-DC conversion circuit, and the circuit comprises a power circuit and a control circuit, wherein the power circuit is used for completing the single-phase AC-DC power conversion. The control circuit is used for completing the instant detection and AD conversion of an output voltage and a grid voltage, carrying out the processing of the output voltage and the grid voltage according to a voltage outer ring control principle, obtaining a compensated duty ratio, forming a PWM drive pulse, controlling the on / off of a power switch in the power circuit, and enabling an input current to remain the sine state when the distortion of the grid voltage happens. The circuit achieves the single-phase AC-DC conversion of enabling the input current to remain the sine state when the distortion of the grid voltage happens, is simple in control, is quick in response, and eliminates the pollution to the quality of electric energy.
Description
technical field [0001] The invention relates to a single-phase power converter in the technical field of power electronic conversion, in particular to a single-phase AC-DC conversion circuit capable of sinusoidal network current even when the network voltage is distorted. Background technique [0002] In order to deal with the power quality pollution caused by the distortion of the grid voltage when the single-phase AC-DC converter is working, reduce the harm of harmonic current, suppress the interference of harmonic current, and make it meet the relevant standards of harmonic current, feedback modulation is required technology. The feedback modulation technology of single-phase AC-DC converter has various control strategies, such as traditional double closed-loop control. The effect of suppressing the harmonic current on the grid side is better by using the double closed-loop control strategy, but the control circuit is complex and the modulation method is cumbersome. In ...
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IPC IPC(8): H02M7/219
Inventor 常中科袁乐乔天辰董娅韵杨喜军唐厚君卢广震赵波李新颜
Owner SHANGHAI JIAOTONG UNIV