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Three-pole DC transmission system based on cdsm‑mmc‑hvdc and lcc‑hvdc

A CDSM-MMC-HVDC, DC transmission system technology, applied in the field of power transmission and distribution, can solve the problems of inability to effectively deal with DC side faults and high system cost, and meet the needs of transformation into DC transmission lines, strong fault control capabilities, and improved The effect of stability

Active Publication Date: 2017-03-29
NR ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the MMC-HVDC system is expensive and cannot effectively deal with DC side faults, which also restricts its application.

Method used

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  • Three-pole DC transmission system based on cdsm‑mmc‑hvdc and lcc‑hvdc

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Embodiment Construction

[0026] In order to further understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings.

[0027] like figure 2 As shown, according to a preferred embodiment of the present invention, the DC power transmission system based on CDSM-MMC-HVDC and LCC-HVDC adopts a three-pole connection form for DC power transmission, and two poles are formed by modularization based on clamping twin sub-modules. The CDSM-MMC-HVDC system of the multi-level converter is composed of the third pole of the LCC-HVDC unipolar system based on the thyristor converter. In the CDSM-MMC-HVDC system, the upper and lower CDSM-MMC type The inverters are connected in series to form a positive and negative bipolar structure. The middle of the positive and negative bipolar structure leads to a grounding branch and is connected to the grounding point of the LCC-HVDC unipolar system. The three poles receive external c...

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Abstract

The invention provides a direct current power transmission system based on CDSM-MMC-HVDC and LCC-HVDC, direct current power transmission is realized through adoption of a three pole connecting mode, two poles consist of CDSM-MMC-HVDC systems of clamping-dual-module-based modularized multi-level current converters, a third pole consists of an thyristor-current-converter-based LCC-HVDC signal pole system, two upper and lower CDSM-MMC type current converters of the CDSM-MMC-HVDC systems are connected in series, and therefore a positive-negative bipolar structure is formed; a grounding branch circuit is led out from the middle of the positive-negative bipolar structure and is connected with a grounding point of the LCC-HVDC single pole system, the three poles are controlled by the outer side, and three pole direct current power transmission can be realized through control over three pole current instructions. The power transmission system put forward by the invention is high in reliability, line faults can be removed, and voltage stability of a current converting bus can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a three-pole DC power transmission system based on CDSM-MMC-HVDC and LCC-HVDC. Background technique [0002] With the sustained and rapid development of my country's economy, the contradiction of power demand has become increasingly prominent. On the one hand, the growth of power load exceeds the transmission capacity of the original AC transmission line, and it is difficult to obtain a new transmission corridor due to land resources constraints; The maximum thermal power that the wire can withstand is less, so it is necessary to adopt new technology to further tap the power transmission potential of the existing line. [0003] Compared with AC transmission, with DC transmission, the line current can reach the maximum thermal limit that the wire can withstand. In 2004, Barthold LO proposed a three-pole DC transmission technology that uses DC current ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 胡铭邵震霞焦鑫艳黄志岭
Owner NR ELECTRIC CO LTD
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