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Direct-current transformer topology and control method thereof

A technology of DC transformer and control method, applied in the direction of converting DC power input to DC power output, control/regulation system, conversion equipment with intermediate conversion to AC, etc., can solve the problems of work, low power density of DC transformer, etc., achieve the effect of increasing power density

Active Publication Date: 2021-02-26
SOUTHEAST UNIV +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a DC transformer topology and its control method, which solves the problems of low power density of the DC transformer and the inability to work within a wide input voltage range in the prior art

Method used

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  • Direct-current transformer topology and control method thereof

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Embodiment Construction

[0028] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] The following descriptions are only preferred embodiments of the present invention, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the principle of the present invention. Fall into the protection scope of the present invention.

[0030] like figure 1 As shown, a DC transformer topology disclosed in this application includes: a transformer, a primary topology, and a secondary topology; the primary topology is composed of N half-bridge units connected in series, and the i-th half-bridge unit includes an upper switch tube S i1 with the lower switch S i2 , the bridge arm composed of series connection and the i-th capacitor C connected in parallel at both ends of the bridge arm i , the upper switching tube S i1 ...

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Abstract

The invention discloses a direct-current transformer topology and a control method thereof, and belongs to the technical field of power generation, power transformation or power distribution, and theprimary side of the direct-current transformer topology is connected with a valve string of a group of N half-bridge units through an input side inductor; and the valve string is connected to a primary winding of a transformer through a transmission inductor and a blocking capacitor, and a secondary side adopts a full-bridge circuit and is connected with the primary side and the secondary side through a medium-high frequency transformer so as to improve the power density of the whole converter. The topology combines the characteristics of an MMC converter and a DAB converter, and has the advantages of high voltage input, easy fault processing and soft switching; according to the control method, improved quasi-square wave modulation is adopted, the number of normally-open driving signals ischanged to enable the voltages at the two ends of the transmission inductor to be matched within a wide input voltage range, meanwhile, the capacitor voltages of all sub-modules in a sampling valve string are sorted, then the driving signals are distributed, and therefore the capacitor voltage balance of the sub-modules is achieved.

Description

technical field [0001] The invention belongs to the technical field of power generation, transformation or distribution, and specifically relates to a DC transformer topology and a control method thereof. Background technique [0002] As an important branch of power electronics integration technology, high-voltage and high-power DC transformers have been a research hotspot in recent years. The MMC (Modular Multilevel Converter, Modular Multilevel Converter) structure is widely used in high-voltage DC transmission and power electronic transformers due to its modularization and good fault handling capabilities. At present, scholars have begun to pay attention to the application of the MMC structure in DC transformers, especially the topology that combines the characteristics of MMC and DAB has been studied by a large number of scholars; [0003] At present, the DC transformer based on MMC and DAB structure has a large number of sub-modules, which is not conducive to the impro...

Claims

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Application Information

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IPC IPC(8): H02M3/28H02M3/335H02M1/088
CPCH02M3/28H02M3/33576H02M1/088Y02B70/10
Inventor 陈武姚金杰舒良才金浩哲史明明袁宇波刘瑞煌姜云龙苏伟司鑫尧孙天奎
Owner SOUTHEAST UNIV
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