Modular multi-level DC/DC converter topology without AC link

A modular multi-level converter technology, applied in the direction of adjusting electrical variables, output power conversion devices, DC power input conversion to DC power output, etc., can solve problems such as complex insulation design

Inactive Publication Date: 2019-05-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, on the one hand, this solution causes different sub-converters in the topology to be at different potential levels, and the insulation design is relatively complicated; Dependence of DC converter on AC link

Method used

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  • Modular multi-level DC/DC converter topology without AC link
  • Modular multi-level DC/DC converter topology without AC link
  • Modular multi-level DC/DC converter topology without AC link

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Embodiment Construction

[0014] In order to further illustrate the performance and working principle of the present invention, the composition and working principle of the invention will be described in detail below in conjunction with the accompanying drawings. However, the modular multilevel DC / DC converter topology without AC links based on this principle is not limited to figure 2 .

[0015] refer to figure 2 , a modular multilevel DC / DC converter topology that does not require an AC link, including a half-bridge MMC model composed of two phases A and B, and the two phases A and B are respectively composed of 2 N The modified half-bridge sub-modules are connected in series; it consists of 4 N +4 auxiliary diodes, 2 auxiliary capacitors C 1 , C 2 , 2 auxiliary IGBT modules T 1 , T 2 The self-balancing auxiliary circuit composed of 4 sets of fault clamping diode groups D composed of a series of clamping diodes Au 、D Al 、D Bu 、D Bl .

[0016] refer to figure 1 , there are two types ...

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Abstract

The present invention provides a modular multi-level DC / DC converter topology without an AC link. The modular multi-level DC / DC converter topology without the AC link is jointly constructed by a modified two-phase half-bridge MMC model, a self-voltage-sharing auxiliary circuit and fault clamping diode group. The self-voltage-sharing auxiliary circuit is composed of an auxiliary diode, an auxiliarycapacitor and an auxiliary IGBT module. The two-phase half-bridge MMC model and the self-voltage-sharing auxiliary circuit are connected through a new port in a half-bridge sub-module. The fault clamp diode group is formed by a series of clamp diodes connected in series and is connected between a primary-side DC bus and the bridge arms in respective phases. The DC / DC converter topology can realize direct conversion of DC energy on both sides without the AC link, and can isolate the faults on both sides of the converter, and reduces the capacity and cost of the MMC required in the DC / DC converter topology on the basis of avoiding AC link loss in the energy conversion process.

Description

technical field [0001] The invention relates to the field of high-voltage direct current transmission, in particular to a topology of a modular multilevel DC / DC converter without an AC link. Background technique [0002] Since the advent of DC transmission technology, it has attracted extensive attention from academia and engineering circles, and its technical advantages in long-distance large-capacity power transmission and new energy grid integration have become increasingly prominent. With the improvement of the voltage level of DC transmission projects, the increase of transmission capacity, and the diversification of application scenarios, the demand for multi-DC voltage level interconnection and DC voltage conversion has gradually emerged. The DC / DC converter with reliable technology and good economy has gradually become a research hotspot. [0003] The academic research on high-voltage and large-capacity DC / DC converters can be roughly divided into three directions: ...

Claims

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Application Information

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IPC IPC(8): H02M3/158
Inventor 赵成勇刘航许建中
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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