Title:
DC SYSTEM AND ITS CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2020/248249
Kind Code:
A1
Abstract:
It provides a DC system converted from an AC system with phase line A, phase line B and phase line C and tis control method. The DC system includes: a first converter station and a second converter station connected by a first phase line and a second phase line selected from the phase line A, the phase line B and the phase line C for transmission of DC power therebetween; a first leg being arranged to connect across DC side of the first converter station, having a first controllable power switch in its upper leg and a second controllable power switch in its lower leg, which are connected in series via a first middle point; a second leg being arranged to connect across DC side of the second converter station, having a third controllable power switch in its upper leg and a fourth controllable power switch in its lower leg, which are connected in series via a second middle point; a bi-directional power switch, being arranged in a third phase line selected from the phase line A, the phase line B and the phase line C; and a controller; wherein: the third phase line is arranged to connect the first middle point and the second middle point; and the controller is configured to turn on the bi-directional power switch and both of the controllable power switches in the respective upper/lower legs so as to allow a current to flow through them. By having the above solutions, at different stages, the controller controls to ether turn on the bi-directional power switch and the power switches in the upper portion of the legs; or turn on the bi-directional power switch and the power switches in the lower portion of the legs. In the former situation, the full current between the two stations is carried by the second phase line, whereas the first phase line and the third phase line are sharing the current flowing in the other direction; and in the latter situation, the full current between the two stations is carried by the first phase line, whereas the second phase line and the third phase line are sharing the current flowing in the other direction.
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Inventors:
ANDERSSON MATS (CN)
YANG XIAOBO (CN)
XIE HAILIAN (CN)
YANG XIAOBO (CN)
XIE HAILIAN (CN)
Application Number:
PCT/CN2019/091358
Publication Date:
December 17, 2020
Filing Date:
June 14, 2019
Export Citation:
Assignee:
ABB POWER GRIDS SWITZERLAND AG (CH)
ANDERSSON MATS (CN)
YANG XIAOBO (CN)
XIE HAILIAN (CN)
ANDERSSON MATS (CN)
YANG XIAOBO (CN)
XIE HAILIAN (CN)
International Classes:
H02J3/36
Foreign References:
| CN103595064A | 2014-02-19 | |||
| CN101512865A | 2009-08-19 | |||
| CN105098812A | 2015-11-25 | |||
| CN109687495A | 2019-04-26 | |||
| EP0867998A1 | 1998-09-30 |
Attorney, Agent or Firm:
BEIJING HANKUN LAW OFFICES (CN)
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