Series multi-terminal direct-current power transmission system

A power transmission system, multi-terminal DC technology, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve problems such as indistinguishable

Active Publication Date: 2014-12-24
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, when this kind of fault occurs, for the protection of 400kv line, the traveling wave during the fault has a voltage ...

Method used

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  • Series multi-terminal direct-current power transmission system
  • Series multi-terminal direct-current power transmission system
  • Series multi-terminal direct-current power transmission system

Examples

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Embodiment Construction

[0015] image 3 A bipolar multi-terminal direct current transmission system according to an embodiment of the present invention is shown. image 3 The shown bipolar multi-terminal direct current transmission system 3 and figure 1The difference of the bipolar multi-terminal direct current transmission system 1 shown is that for at least one converter unit 100b, 101b, 110b, 111b on the high voltage side (the shaded one in the same group of converter units represents the transformation of the high voltage side Converter unit) is improved, and a filter is arranged between the first DC terminal of the first converter unit group in the converter unit group and the high-voltage DC pole line outside the area, which is used for the high-voltage direct current from the outside area. AC filtering is performed for the fault component signal of the pole line and DC filtering is performed for the output signal from the converter cell bank. For example, at the first DC terminal of the firs...

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Abstract

The invention provides a series multi-terminal direct-current power transmission system. The series multi-terminal direct-current power transmission system comprises converter unit groups, an external high-voltage direct-current polar line and a filter. The converter unit groups include a rectifier unit group and an inverter unit group, the rectifier unit group comprises at least two converter units in sequentially serial connection through at least one internal direct-current bus, and the inserter unit group comprises at least two converter units in sequentially serial connection through at least one internal direct-current bus. A first direct-current terminal of the rectifier unit group and a first direct-current terminal of the inverter unit group are electrically coupled with a first terminal and a second terminal of the external high-voltage direct-current polar line respectively; a second direct-current terminal of the rectifier unit group and a second direct-current terminal of the inverter unit group are electrically coupled with a first earthing pole and a second earthing pole respectively. The filter is positioned between the external high-voltage direct-current polar line and a first direct-current terminal of a first converter unit group in the converter unit groups. By adoption of the topology, external faults and internal faults can be distinguished.

Description

technical field [0001] The present invention relates to a multi-terminal direct current transmission system, more specifically, to a series multi-terminal direct current transmission system. Background technique [0002] With the development of power electronics technology, DC power grid has become a development trend, including series multi-terminal DC transmission system and parallel multi-terminal DC transmission system. Among them, the series multi-terminal DC transmission system has the advantages of low construction cost and large transmission capacity. [0003] figure 1 An existing bipolar multi-terminal DC transmission system is shown. Such as figure 1 As shown, the bipolar multi-terminal direct current transmission system 1 includes a positive multi-terminal direct current transmission system 10 and a negative multi-terminal direct current transmission system 11 . The positive multi-terminal DC power transmission system 10 includes two sets of converter units, w...

Claims

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Application Information

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IPC IPC(8): H02J1/00H02J3/36G01R31/08
CPCY02E60/60
Inventor 刘凯李幼仪王建平王庆平杨晓波
Owner HITACHI ENERGY SWITZERLAND AG
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