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Soft-start system and method for isolated DC converter applied to DC distribution network

A technology of DC distribution network and DC converter, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and controlling/regulating systems, and can solve the problems of increasing system complexity, increasing losses, and reducing system reliability, etc. problem, to achieve the effect of steady voltage rise, suppression of current impact, and good anti-interference ability

Active Publication Date: 2019-03-19
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional methods have deficiencies, such as: (1) soft-start method with series resistors, but this method will increase loss, and mechanical contacts will reduce system reliability; (2) start-up method using auxiliary circuits, but this method will increase system complexity

Method used

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  • Soft-start system and method for isolated DC converter applied to DC distribution network
  • Soft-start system and method for isolated DC converter applied to DC distribution network
  • Soft-start system and method for isolated DC converter applied to DC distribution network

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0034] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinatio...

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Abstract

The invention discloses an isolated DC converter soft-start system and method applied to a DC distribution network. After the DC converter is started, the duty cycle of the H-bridge output square wave voltage on the input side gradually increases from 0 to 0.5 according to a ramp function. Set the time for the duty cycle from 0 to 0.5 to be the start-up time; after the DC converter is started, keep the duty cycle of the H-bridge output square wave voltage at the output side always at 0.5. After the DC converter is started, within the start-up time, the output to The constant voltage gradually increases from 0 to the rated value according to the ramp function, and the change of the output given voltage is consistent with the change of the duty cycle of the H-bridge output square wave voltage on the input side. Through the coordinated control of these two methods, the current impact and DC voltage oscillation during start-up can be effectively suppressed. The system has good anti-interference ability and does not need to use additional circuits and start-up resistors, and the start-up logic is simple.

Description

technical field [0001] The invention relates to a soft start system and method for an isolated DC converter applied to a DC distribution network. Background technique [0002] With the massive access of low-voltage distributed power generation and energy storage equipment, the DC microgrid will be the most important operation mode in the low-voltage field. Unlike the AC distribution network, there are no problems such as frequency fluctuation and power factor in the DC distribution network, but it cannot achieve voltage conversion, power transmission and electrical isolation through power frequency transformers like the AC distribution network, and needs to rely on isolated DC conversion device. Its implementation is to convert electrical energy into high-frequency electrical energy through power electronic devices, and then realize voltage conversion and electrical isolation through high-frequency transformers. Commonly used isolated DC converters include forward type, fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M3/335
CPCH02M1/36H02M3/3353H02M1/0058Y02B70/10
Inventor 张承慧潘羿威何晋伟陈阿莲袁帅宋超超
Owner SHANDONG UNIV
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