Current source-mixed voltage source series type current converter topology with flexible voltage output capability

A technology of voltage output and voltage source type, which is applied in the field of current source-mixed voltage source series converter topology, can solve the problems of increased investment cost, restriction of FBMMC engineering application, increase, etc., and achieve the effect of cost reduction

Active Publication Date: 2018-07-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the semiconductor devices required by FBMMC are double that of half-bridge MMC, and the investment cost is significantly increased, which seriously restricts the engineering application of FBMMC. Therefore, most VSCs in engineering currently use HBMMC structures.

Method used

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  • Current source-mixed voltage source series type current converter topology with flexible voltage output capability
  • Current source-mixed voltage source series type current converter topology with flexible voltage output capability
  • Current source-mixed voltage source series type current converter topology with flexible voltage output capability

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Embodiment Construction

[0041] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] The invention provides a current source-mixed voltage source series converter topology with flexible voltage output capability. The converter topology is composed of a current source converter unit and a voltage source converter unit in series; the current source converter unit has a structure such as an LCC based on a diode or a thyristor; the voltage source converter unit The sub-module unit consists of sub-module units without negative level output capability (such as: half-bridge sub-module, IGBT components, etc.) and sub-module units with negative-level output capability (such as: full-bridge sub-module).

[0043] Such as figure 1 as shown, figure 1 The hybrid direct current converter topology proposed by the present invention; the structure includes a current source type converter unit and a voltage source type con...

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Abstract

The invention provides a current source-mixed voltage source series type current converter topology with flexible voltage output capability. The mixed series type current converter topology consist ofa current source type current conversion unit and a voltage source type current conversion unit connected in series; the current source type current conversion unit has an LCC structure and the likewhich are formed based on a diode or thyristor; and each phase of bridge arm of the voltage source type current conversion unit comprises sub module units (such as a half-bridge sub module, an IGBT assembly and the like) without negative level output capability, and sub module units (such as a full-bridge sub module) with negative level output capability in a serial connection manner. When the mixed series type current converter topology is applied to the direct current power transmission system, the direct current system is controlled to block a direct current faulty current, and quick powerflow conversion (no need of an extra mechanical switch) can be realized; and therefore, the mixed series type current converter topology not only is suitable for high-voltage direct current power transmission systems at two ends, but also can be applied to a direct current power grid.

Description

technical field [0001] The invention relates to a device in the technical field of power transmission and distribution, in particular to a current source-mixed voltage source series converter topology with flexible voltage output capability. Background technique [0002] Due to the endowment characteristics of energy distribution, it is necessary to transmit a large amount of electric energy from the northwest region with abundant energy reserves to the eastern coastal region with heavy load. Therefore, it is necessary to erect high-voltage and large-capacity lines for long-distance transmission and realize the strategy of west-to-east power transmission. Target. [0003] At present, line commutated converter based high voltage direct current (LCC-HVDC) as a current source converter has been maturely used in large-capacity, long-distance power transmission projects. However, since LCC-HVDC uses thyristors as commutation devices, it needs an AC system with a certain strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J1/10
CPCH02J1/10H02J3/36Y02E60/60
Inventor 赵成勇郭春义许建中李佩霖王烨
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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