Protection method of DC electricity transmission high-voltage convertor station

A technology of DC power transmission and DC power transmission system, applied in emergency protection circuit devices, electrical components, circuit devices, etc., can solve the problem of large investment in converter stations, low harmonic frequency of converters, and inability to supply power to small-capacity AC system loads and other problems, to achieve the effect of high system redundancy and reduced impact

Inactive Publication Date: 2010-06-23
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] However, traditional DC transmission still has many shortcomings, such as the inability to supply power to small-capacity AC systems and loads without rotating motors; the harmonics generated by the converter are low and the capacity is large; the converter absorbs more reactive power , large investment in converter stations, etc.

Method used

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  • Protection method of DC electricity transmission high-voltage convertor station
  • Protection method of DC electricity transmission high-voltage convertor station
  • Protection method of DC electricity transmission high-voltage convertor station

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Embodiment Construction

[0046] The accompanying drawings show specific embodiments of the present invention, and the present invention will be further described below through the accompanying drawings and the embodiments.

[0047] Such as figure 1 Shown is the system structure diagram of the DC transmission high-voltage converter station device protected by the DC transmission high-voltage converter station protection method of the present invention, including two groups of mutually independent high-voltage converter stations (such as figure 1 1 and 1′), the two groups of converter stations are combined in parallel through the DC side in the back-to-back connection mode, and are respectively used as the sending end (also known as the sending end) and the receiving end (also called the receiving end) of the DC transmission. Each group of high-voltage converter stations includes a pair of modules in series (such as figure 1 6, 7, 6', 7'), each module consists of a phase-shifting transformer (such as ...

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Abstract

The invention relates to a protection method of a DC electricity transmission high-voltage convertor station, which is used for protection of the DC electricity transmission high-voltage convertor station in the field of electricity transmission and transformation and divides the defects existing in a high-voltage convertor station into three levels of a convertor station system level, a convertor device level and a unit convertor level to design. When a DC electricity transmission system generates the defects, the system sorts and transfers the defects by a defect library, grades the defects according to different defect sorts, carries out corresponding processing and carries out corresponding alarm and action. The protection method can carry out grading comprehensive protection for the high-voltage convertor station. When the defects occur, the system can rapidly query the types of the defects and then carry out corresponding judgment and action for the defects according to the system protection levels, so the protection method reliably and effectively protects the DC electricity transmission system and can minimize the shock impact of the transient disturbance of the high-voltage convertor station on the DC electricity transmission system.

Description

technical field [0001] The invention relates to a DC transmission protection method, in particular to a DC transmission high-voltage converter station hierarchical protection method applied in the field of power transmission and transformation. The protection method can also be used for small-scale decentralized renewable energy sources (such as wind power, solar energy, etc.) etc.) grid-connected power plants, sensitive load power supply, urban load center power supply, offshore drilling platform power supply, island power supply. Background technique [0002] With the country's vigorous development and utilization of renewable clean energy, the continuous optimization of the energy structure, and the continuous expansion of the use of renewable energy such as wind energy and solar energy, its inherent characteristics of dispersion, small size, and distance from the load center continue to show up. However, the adoption of traditional power transmission technology brings a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J13/00H02H7/26H02H7/12
CPCY02E60/60Y04S10/20Y02E60/725
Inventor 周细文敬华兵王小方李军章辉罗文广何伯钧范伟黄志国袁光君
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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