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A power return optimization method for series-in-series-out DC converters

A technology of a DC converter and an optimization method, which is applied in the direction of converting DC power input into DC power output, output power conversion devices, instruments, etc., and can solve the problems of difficult implementation, increased control links, and serial input and serial output without consideration Problems such as the structural characteristics of the DC converter, to achieve the effect of reducing power backflow

Active Publication Date: 2020-03-31
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods reduce the return power of the system to a certain extent, they often need to add complex control links, and complex analysis must be carried out in multiple working modes, and the specific implementation is difficult.
Moreover, these methods are all designed for single-module bidirectional full-bridge DC converters, without considering the inherent structural characteristics of series-in-series-out DC converters

Method used

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  • A power return optimization method for series-in-series-out DC converters
  • A power return optimization method for series-in-series-out DC converters
  • A power return optimization method for series-in-series-out DC converters

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Embodiment Construction

[0040] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0041] Such as figure 1 Shown is a single-module bidirectional full-bridge DC converter, which includes a full-bridge inverter and a full-bridge rectifier. The AC sides of the inverter and rectifier are interconnected through a transformer and a transformer leakage inductance to realize the transition from the input side to the output side. DC conversion and power transmission. u 1 is the input DC voltage, U 2 is the output DC voltage, C 1 、C 2 are the input and output side DC capacitors respectively, K is the transformation ratio of the transformer, u p and u s is the primary and secondary side AC voltage, u h1 is the output voltage of the full-bridge inverter, ...

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Abstract

The invention discloses a power return optimization method for a series-in and series-out DC converter. The method aims at the inherent characteristics of the topological structure of the series-in and series-out DC converter. N The initial phase of the modulated wave of each full-bridge inverter is equally divided and shifted, so that the output of each full-bridge on the series side is divided by 2 N All even-numbered circulating current excitation voltages other than the sub-integer multiple cancel each other, thereby reducing the overall power return of the DC converter. The method of the invention has simple implementation steps, does not need to add any hardware equipment or additional control links, and has practical engineering value.

Description

technical field [0001] The invention relates to a power return optimization method of a series-in-series-out DC converter, which is applied to an input-series-output-series combined DC converter and belongs to the technical field of DC conversion. Background technique [0002] The bidirectional full-bridge DC converter has the function of realizing bidirectional flow of energy while maintaining the polarity of the voltage at both ends of the converter. Compared with the traditional unidirectional DC converter, it reduces the number of components and overall cost, and reduces the conversion cost. The size, weight and footprint of the inverter improve the system power factor. Therefore, bidirectional full-bridge DC converters are being widely used in occasions where bidirectional energy flow is required, such as DC motor drive, DC interconnection, and new energy grid connection. [0003] In order to match the high-voltage DC buses of different voltage levels, avoid the voltag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33584H02M1/0074H02M1/0083
Inventor 梅军丁然管州赵剑锋
Owner SOUTHEAST UNIV