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Modulation strategy of DC (Direct Current)-DC convertor and submodule voltage-sharing method thereof

A technology of DC-DC and converter, which is applied in the modulation strategy of DC-DC converter and its sub-module voltage equalization field, and can solve the problems that cannot be directly applied

Active Publication Date: 2016-03-30
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

Therefore, these matching pressure equalization methods may not be directly applicable

Method used

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  • Modulation strategy of DC (Direct Current)-DC convertor and submodule voltage-sharing method thereof
  • Modulation strategy of DC (Direct Current)-DC convertor and submodule voltage-sharing method thereof
  • Modulation strategy of DC (Direct Current)-DC convertor and submodule voltage-sharing method thereof

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Embodiment Construction

[0059] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0060] The present invention provides a modulation strategy for a DC-DC converter, wherein the DC-DC converter adopts an intermediate frequency isolation type modular multi-level DC-DC converter. Such as figure 2 As shown, the sub-modules are all half-bridge structures. Among them, SM X is a submodule, X is the submodule number, each phase contains 2N submodules, and each upper and lower bridge arm contains N submodules. figure 2 The meaning of each parameter in is:

[0061] The symbol "pri" indicates the primary side, the ...

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Abstract

The invention provides a modulation strategy of a DC (Direct Current)-DC convertor and a submodule voltage-sharing method thereof. The modulation strategy comprises the following steps: 1) constructing a switching function model of a submodule; 2) determining a ladder undulant bridge arm switching function model; and 3) according to the ladder undulant bridge arm switching function model, modulating the alternating-current side voltage current waveform of the DC-DC convertor. The voltage-sharing method comprises the following steps: constructing an energy model, and changing energy interaction on the submodule by primary side alternating current on the basis of the energy model so as to balance submodule voltage. Compared with the prior art, the modulation strategy of the DC convertor and the submodule voltage-sharing method thereof can improve the intermediate alternating current voltage frequency of the DC-DC convertor on the premise that switching frequency is not improved, reduce capacitance voltage fluctuation, reduce the volume of submodule capacitance in the convertor, are favorable for reducing the volume of passive devices including a bridge arm inductor, a transformer and the like, lower cost and cause the DC-DC convertor to own high power transmission capability and power density.

Description

technical field [0001] The invention relates to the technical field of direct current power grids, in particular to a modulation strategy of a DC-DC converter and a sub-module voltage equalization method thereof. Background technique [0002] With the development of the DC grid, as a key device in the DC grid, the high-voltage and high-power DC-DC converter has become a research hotspot. Among them, the DC-DC converter based on the MMC structure has the advantages of variable number of modules and adjustable voltage level, which has attracted extensive attention. At present, there are many kinds of DC-DC converter topologies based on MMC, among which the topological structure researched and concerned by Chinese and foreign scholars is the isolated DC-DC converter based on MMC. [0003] as attached figure 1 As shown, the MMC-based isolated DC-DC converter usually uses two sets of MMC converters, and the AC of the converters is connected through a transformer. There are man...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M7/49
CPCH02M3/335H02M7/49H02M1/007
Inventor 姚良忠杨波曹远志李琰蔡旭朱淼张建文卢俊峰孙长江丁杰吴福保庄俊陶以彬李官军崔红芬王德顺周晨刘欢鄢盛驰王志冰孙蔚胡金杭冯鑫振吴婧朱红保李跃龙牟昱东
Owner CHINA ELECTRIC POWER RES INST
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