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Bipolar flexible direct-current power transmission system and converter station thereof

A power transmission system, flexible direct current technology, applied in the field of electric power, can solve problems such as increased current stress of the converter, damage to the converter, and threats to equipment safety

Inactive Publication Date: 2017-02-15
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The short-circuit current flows through the converter, which increases the current stress of the converter, even causes damage to the converter, and also seriously threatens the safety of related equipment in the fault line

Method used

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  • Bipolar flexible direct-current power transmission system and converter station thereof
  • Bipolar flexible direct-current power transmission system and converter station thereof
  • Bipolar flexible direct-current power transmission system and converter station thereof

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Embodiment Construction

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0027] The embodiment of the present invention provides a converter station for a bipolar flexible DC transmission system, which includes a positive-polarity converter part 100 and a negative-polarity converter part 200; the positive-polarity converter part 100 includes a first converter 110; and a negative electrode. The neutral converter part 200 includes a second converter 210; the converter station also includes a current limiting mod...

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Abstract

The invention provides a bipolar flexible direct-current power transmission system and a converter station thereof and relates to the electric power technology field. When a direct current side of the bipolar flexible direct-current power transmission system generates a fault, a short circuit current can be restrained. The converter station used for the bipolar flexible direct-current power transmission system comprises a positive polarity conversion portion and a negative polarity conversion portion. The positive polarity conversion portion comprises a first converter. The negative polarity conversion portion comprises a second converter. The converter station comprises a current limiting module. The current limiting module comprises an electric reactor. The electric reactor is connected in series to a neutral bus.

Description

Technical field [0001] The present invention relates to the field of electric power technology, in particular to a bipolar flexible direct current transmission system and its converter station. Background technique [0002] Flexible DC transmission technology is a new type of DC transmission technology. Reasonable control and protection strategies determine the safe and stable operation of the flexible DC transmission system. Its flexible application performance makes it have broad application prospects in the fields of urban grid interconnection, clean energy grid connection and island power supply. [0003] In order to achieve the requirements of large-capacity power transmission, it is necessary to increase the number of sub-modules to increase its voltage level. However, too many sub-modules are cascaded, which makes the control of valve control equipment more difficult. Therefore, the bipolar structure is adopted to reduce the number of single converter units. While cascading...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02M1/34
CPCH02J3/36H02M1/34H02M1/348Y02E60/60
Inventor 徐迪臻黄莹赵晓斌周诗嘉卢毓欣张祖安
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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