A Boost Modular DC-DC Converter for HVDC Transmission Systems

A technology of DC-DC and step-up module, which is applied in the direction of DC power input conversion to DC power output, output power conversion device, AC power input conversion to DC power output, etc., which can solve the problem of not being able to control active and reactive power separately , high-voltage direct current transmission system is unstable and reliable, and the high cost of DC-DC converters and other issues

Active Publication Date: 2022-08-02
SHENZHEN POLYTECHNIC
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  • Abstract
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  • Claims
  • Application Information

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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  • A Boost Modular DC-DC Converter for HVDC Transmission Systems
  • A Boost Modular DC-DC Converter for HVDC Transmission Systems
  • A Boost Modular DC-DC Converter for HVDC Transmission Systems

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Embodiment Construction

[0060] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0061] See attached Figure 1-15 , the present invention discloses a boosting modular DC-DC converter for a high-voltage direct current transmission system, comprising the following steps:

[0062] Step S1: establish a topology structure of the boost modular DC-DC converter, wherein the three-phase MMC inverter generates a controllable AC voltage and is connected to the primary side of the three-phase decoupling intermediate frequency...

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Abstract

The invention discloses a step-up modularized DC-DC converter for a high-voltage direct-current power transmission system, which is used as a direct-current collection point of the high-voltage direct-current power transmission system. The boost modular DC-DC converter of the present invention employs state-of-the-art MMCs at both ends. A special intermediate frequency decoupling transformer is used to achieve a miniaturized design. The converter design features modularity, scalability, redundancy, and galvanic isolation, and is implemented with low-voltage current devices. The converter achieves similar efficiencies with a 66% reduction in the number of SMs on the secondary side compared to conventional two-phase MMC-based DC‑DC converters.

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 power transmission system. Background technique [0002] High-voltage direct current transmission systems (HVDC) are a mature and proven technology for transmitting large-scale energy over long distances. With the increasing use of DC transmission systems, the interconnection between different levels of DC transmission systems is becoming more and more challenging. HVDC acquisition networks are a promising integration technology designed to eliminate additional conversion stages and improve 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 achieve system integration with HVDC. High-voltage and high-power DC-DC converters can not only be used as DC coll...

Claims

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Application Information

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Patent Type & Authority Patents(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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