Title:
LOW-FREQUENCY POWER TRANSMISSION SYSTEM OUTAGE METHOD AND APPARATUS
Document Type and Number:
WIPO Patent Application WO/2023/193729
Kind Code:
A1
Abstract:
Disclosed in the present invention are a low-frequency power transmission system outage method and system. The low-frequency power transmission system outage method of the present invention comprises: setting three bridge arms, which are connected to the same phase of a low-frequency side, as a group, so as to form a plurality of groups; switching all sub-modules of the three bridge arms in each group from a locked state to a bypass state, then switching all sub-modules in a first bridge arm from the bypass state to a positive-voltage input or negative-voltage input state, and when the capacitive voltages of the sub-modules of the bridge arm are decreased to a set value, switching all the sub-modules of the bridge arm back to the bypass state, the operation steps for a second bridge arm and a third bridge arm being the same as those for the first bridge arm, and after the above operations are completed for all the bridge arms in the group, switching all the sub-modules in the group from the bypass state to the locked state; and all the sub-modules continuing to slowly discharge by means of voltage-equalization resistors, which are connected in parallel to same. By means of the present invention, rapid, stable and impact-free low-frequency power transmission system outage can be realized, thereby ensuring the safety of a power grid and a device.
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Inventors:
XU FENG (CN)
LU YI (CN)
LU CHENGYU (CN)
QIU PENG (CN)
HUANG XIAOMING (CN)
NI XIAOJUN (CN)
CHEN QIAN (CN)
DING CHAO (CN)
ZHENG MEI (CN)
LU YI (CN)
LU CHENGYU (CN)
QIU PENG (CN)
HUANG XIAOMING (CN)
NI XIAOJUN (CN)
CHEN QIAN (CN)
DING CHAO (CN)
ZHENG MEI (CN)
Application Number:
PCT/CN2023/086385
Publication Date:
October 12, 2023
Filing Date:
April 06, 2023
Export Citation:
Assignee:
STATE GRID ZHEJIANG ELECTRIC POWER CO LTD RES INSTITUTE (CN)
International Classes:
H02M1/00; H02J3/38; H02M5/00
Foreign References:
| CN114696360A | 2022-07-01 | |||
| CN110932538A | 2020-03-27 | |||
| CN104201709A | 2014-12-10 | |||
| CN114142463A | 2022-03-04 |
Other References:
LU LIWEN; WU XIAODAN; QIU DEFENG; DONG YUNLONG; QIU PENG: "Flexible Startup and Shutdown Strategy of Low Frequency Transmission System Based on Modular Multilevel Matrix Converter", GAODIANYA-JISHU : JIKAN - HIGH VOLTAGE ENGINEERING, WUHAN : SHUILI DIANLI BU WUHAN GAOYA YANJIUSUO, CN, vol. 49, no. 1, 20 November 2021 (2021-11-20), CN , pages 248 - 257, XP009549291, ISSN: 1003-6520, DOI: 10.13336/j.1003-6520.hve.20211609
ZHANG ZHEREN; XU ZHENG; XU FENG; XUE YINGLIN: "Shut-down Control Scheme for Modular Multilevel Converter Based HVDC", PROCEEDINGS OF THE CSEE, ZHONGGUO DIANJI GONGCHENG XUEHUI, CN, vol. 35, no. 11, 5 June 2015 (2015-06-05), CN , pages 2670 - 2680, XP009550190, ISSN: 0258-8013, DOI: 10.13334/j.0258-8013.pcsee.2015.11.005
ZHANG ZHEREN; XU ZHENG; XU FENG; XUE YINGLIN: "Shut-down Control Scheme for Modular Multilevel Converter Based HVDC", PROCEEDINGS OF THE CSEE, ZHONGGUO DIANJI GONGCHENG XUEHUI, CN, vol. 35, no. 11, 5 June 2015 (2015-06-05), CN , pages 2670 - 2680, XP009550190, ISSN: 0258-8013, DOI: 10.13334/j.0258-8013.pcsee.2015.11.005
Attorney, Agent or Firm:
SCIHEAD IP LAW FIRM (CN)
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