A DC voltage conversion device and its bridge arm control method

A technology of conversion device and DC voltage, which is applied in the direction of converting DC power input to DC power output, output power conversion device, and adjusting electric variables, etc., which can solve the problems of high cost, large area occupation, large loss, etc., and achieve the required investment The effect of less, low investment, and low loss level

Active Publication Date: 2019-09-06
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0011] To sum up, the traditional low-voltage topology is difficult to apply to the high-voltage field. On the other hand, the DC-DC transformer based on modular multi-level technology has attracted widespread attention due to its good scalability. However, the originally proposed The "face-to-face" DC transformer based on modular multilevel technology connects two AC / DC modular multilevel converters through an AC transformer for voltage conversion, which not only occupies a large area, but also has high cost and large loss. Difficult to spread widely

Method used

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  • A DC voltage conversion device and its bridge arm control method
  • A DC voltage conversion device and its bridge arm control method
  • A DC voltage conversion device and its bridge arm control method

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Embodiment Construction

[0036] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] 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 relates to a DC voltage conversion device and a bridge arm control method thereof. The device has a single-phase, two-phase or more than two-phase structure, and each phase is composed of basic functional modules, and the basic functional modules include cascaded devices and sub-modules connected in series. Cascaded structure; the technical solution provided by the present invention realizes voltage conversion without a transformer by adopting a device series structure and sub-module cascade combination method, and at the same time realizes soft switching of series devices, and reduces investment and land occupation .

Description

technical field [0001] The invention relates to a voltage conversion device in the field of flexible direct current transmission, in particular to a direct current voltage conversion device and a bridge arm control method thereof. Background technique [0002] The rapid development of flexible DC technology has made DC grid possible. DC grid technology has no transmission distance limit, does not require reactive power compensation equipment, has strong flexibility and controllability, and can provide power supply for large cities and offshore wind power access. A good solution has broad application prospects. [0003] In practical application, DC grid technology faces the problem of voltage level transformation similar to that of AC grid, and the research on DC voltage converter is still in the preliminary stage worldwide. According to the characteristics of the DC grid, the main characteristic requirements of the DC voltage converter are as follows: [0004] 1. A wide ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/125
CPCH02M7/4835H02M1/0095H02M7/4837
Inventor 杨杰贺之渊庞辉李强
Owner STATE GRID CORP OF CHINA
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