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Boost modular DC-DC converter for high-voltage DC power transmission system

A DC-DC, booster module technology, applied in the direction of converting DC power input to DC power output, output power conversion device, converting AC power input to DC power output, etc. The voltage stress of the half-bridge sub-module increases, and the active and reactive power cannot be controlled separately.

Active Publication Date: 2021-10-22
SHENZHEN POLYTECHNIC
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

These converters include unidirectional converters and bidirectional converters, but MMC-based unidirectional DC / DC converters cannot control active and reactive power separately due to the application of diodes on the secondary side as rectifier sub-modules
[0006] It can be seen from the above that the application of the existing DC-DC converter to the high-voltage direct current transmission system will cause the voltage stress of the half-bridge sub-module to increase, which will lead to the instability and reliability of the high-voltage direct current transmission system, and the existing DC-DC conversion The converter needs to use more SM (power sub-module or power components), which leads to high cost of DC-DC converter

Method used

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  • Boost modular DC-DC converter for high-voltage DC power transmission system
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  • Boost modular DC-DC converter for high-voltage DC power transmission system

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Embodiment Construction

[0059] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0060] See attached Figure 1-15 , the invention discloses a step-up modular DC-DC converter for a high-voltage direct current transmission system, comprising the following steps:

[0061] Step S1: Establish the topology of the step-up modular DC-DC converter, in which the three-phase MMC inverter generates a controllable AC voltage connected to the primary side of the three-phase decoupling intermediate frequency transformer.

[0062] Specifically, as attache...

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Abstract

The invention discloses a boost modular DC-DC converter for a high-voltage direct-current power transmission system. The boost modular DC-DC converter is used as a direct-current acquisition point of the high-voltage direct-current power transmission system. According to the boost modular DC-DC converter disclosed by the invention, the most advanced MMC is adopted at the two ends of the boost modular DC-DC converter. A special intermediate-frequency decoupling transformer is adopted, so that the miniaturization design is realized. The converter design has the characteristics of modularization, expandability, redundancy, current isolation and the like, and is realized by adopting a low-voltage current device. Compared with two traditional DC-DC converters based on a three-phase MMC, the converter achieves similar efficiency, and the number of SMs is reduced by 66% in the secondary side.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a step-up modular DC-DC converter used in a high-voltage direct current transmission system. Background technique [0002] High voltage direct current transmission (HVDC) is a mature and proven technology for transmitting large-scale energy over long distances. With the increasing application of DC transmission system, the interconnection between different levels of DC transmission system becomes more and more challenging. The HVDC harvesting network is a promising integration technique aimed at eliminating additional conversion stages and improving system reliability. At present, the use of multi-modules (composed of multiple converter modules) and modular multi-level topology to construct high-voltage and high-power DC-DC converters is the key to realize system integration with HVDC. The high-voltage and high-power DC-DC converter can not only be used as a DC collection ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155H02M7/483H02M7/5387H02J3/36
CPCH02M3/155H02M7/483H02M7/5387H02J3/36Y02E60/60
Inventor 刘赫
Owner SHENZHEN POLYTECHNIC
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