MMC and full bridge structure based middle and low voltage transformer and control strategy thereof

A technology of full-bridge structure and control strategy, which is applied in the direction of control/regulation systems, instruments, and regulation of electrical variables, etc., can solve problems such as difficult implementation, and achieve the effects of reducing costs, reducing voltage stress, and reducing voltage levels

Inactive Publication Date: 2018-10-23
XI AN JIAOTONG UNIV
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Problems solved by technology

At the same time, the realization of the voltage equalization chara

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  • MMC and full bridge structure based middle and low voltage transformer and control strategy thereof
  • MMC and full bridge structure based middle and low voltage transformer and control strategy thereof
  • MMC and full bridge structure based middle and low voltage transformer and control strategy thereof

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[0030] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0031] Such as figure 1 As shown, the system topology includes MMC (modular multilevel converter) and at least one cascaded full-bridge structure, in which the two ends of the DC side of the MMC are connected to the two poles of the medium voltage DC bus, and the two ends of the AC side are connected Into the cascaded full bridge structure; the cascaded full bridge structure includes a number of transformers and a full bridge circuit connected to the secondary side of the transformer. Both ends of the full bridge circuit are connected in parallel to the poles of the low-voltage DC bus; in a cascaded full bridge module The primary side of all transformers is connected in series with the AC side of MMC.

[0032] The multiple cascaded full bridge structures are connected in parallel, specifically, the primary side of the series transformer between the multiple casc...

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Abstract

The invention relates to an MMC and full bridge structure based middle and low voltage transformer and a control strategy thereof. A modularized multilevel transverter serves as an inversion device ina middle-voltage bus to AC link, so that the middle voltage side of a DC/DC converter has a better transmission characteristic and higher reliability; a full bridge structure is used in the low voltage side, the structure is simple, and control is convenient; and the different transformers are connected in series to reduce the voltage level of the transformers, and are connected in parallel to improve the power transmission capability of the system, and energy is transmitted to low-voltage buses of low voltage levels. The voltage level of the AC bus can be changed flexibly according to requirements by means of an improved square wave modulation method. A provided topology is more suitable for a present application scene of the middle and low voltage distribution network. A modulation strategy with the topology can reduce the voltage level in the AC link and reduce the voltage stress of a transformer device; the number of modules needed by the system is reduced greatly under the same voltage level, and the cost is reduced; and a good voltage sharing effect is achieved.

Description

technical field [0001] The invention belongs to the field of DC / DC converter control and modulation for medium and low voltage direct current distribution network, and in particular relates to a medium and low voltage transformer based on MMC and full bridge structure and its control strategy. Background technique [0002] With the outbreak of the energy crisis in the last century, the problems of environmental pollution and energy shortages have intensified, and distributed power generation such as photovoltaics and wind power has continued to develop, and most of the power generated by distributed power is direct current. At the same time, with the continuous development of the information age, the number and proportion of large-scale loads such as data centers and network centers continue to increase; under the trend of continuous development of electric vehicle technology, the installation of charging piles will also be greatly increased. Increased DC demand. The tradit...

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33576H02M1/007
Inventor 卓放程盛王丰史书怀朱彦霖
Owner XI AN JIAOTONG UNIV
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