A Quasi-Zero Current Switching DC/DC Converter Based on Modular Multilevel Converter

A modular multi-level and current switch technology, applied in the direction of converting DC power input to DC power output, converting AC power input to DC power output, and adjusting electrical variables, can solve the difficulties in manufacturing high-voltage and large-capacity intermediate-frequency isolation transformers, Problems such as high loss of isolated DC/DC converter and large voltage stress of LCL circuit can be solved to achieve the effect of improving system reliability, high voltage level and realizing zero reactive power control

Active Publication Date: 2019-02-22
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3
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  • Abstract
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Problems solved by technology

[0004] Based on the current high loss of the isolated DC / DC converter of MMC and the difficulty in manufacturing the high-voltage and large-capacity intermediate-frequency isolation transformer used, the large voltage stress of the LCL circuit in the LCL-DC / DC converter, and the poor electromagnetic environment of the converter, the present invention proposes A quasi-zero-current switching DC / DC converter based on a modular multilevel converter. The DC / DC converter uses the LCL resonant network to realize the approximate soft switching of the MMCs on both sides and reduce the loss; through reasonable configuration of the two The number of sub-modules and the operating mode of the side MMC reduce the electrical stress and voltage change rate of the LCL circuit, improve the electromagnetic environment of the LCL, and improve the reliability of the DC / DC converter

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  • A Quasi-Zero Current Switching DC/DC Converter Based on Modular Multilevel Converter
  • A Quasi-Zero Current Switching DC/DC Converter Based on Modular Multilevel Converter
  • A Quasi-Zero Current Switching DC/DC Converter Based on Modular Multilevel Converter

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[0022] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. These embodiments of the present invention may be referred to herein, individually or collectively, by the term "invention", which is for convenience only and is not...

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Abstract

The invention provides a quasi-zero current switch DC / DC converter based on a modular multilevel converter, the DC / DC converter includes a low voltage side modular multilevel converter, an LCL resonant circuit and a high voltage side A modular multilevel converter; the low voltage side modular multilevel converter is connected to the high voltage side modular multilevel converter through an LCL resonant circuit. The technical solution provided by the invention utilizes the LCL resonant circuit to realize the approximate soft switching of the MMC converters on both sides, which reduces the loss; the electrical stress and voltage change of the LCL circuit are reduced by rationally configuring the number of sub-modules and the operating mode of the MMC on both sides rate, improve the electromagnetic environment of the LCL, and improve the reliability of the DC / DC converter.

Description

technical field [0001] The invention relates to a DC converter, in particular to a quasi-zero-current switching DC / DC converter based on a modular multilevel converter. Background technique [0002] The DC power grid technology based on conventional DC and flexible DC provides effective technical means to solve the problems of safe and efficient long-distance transmission of large-scale renewable energy, power supply in large cities and islands, etc. The high-voltage and large-capacity DC / DC converter is one of the core equipment for building a DC power grid system. This equipment realizes the connection and interaction of DC transmission lines of different voltage levels, and then forms a large-scale DC system network. At present, the research on DC / DC converter technology is mainly focused on low and medium power voltage levels. With the continuous construction of high-voltage DC lines and the increasingly urgent demand for DC power grids, high-voltage and large-capacity D...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M3/335
CPCH02M3/335Y02B70/10H02M7/4835
Inventor 王新颖汤广福贺之渊魏晓光张升周万迪丁骁肖湘宁
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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