Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
ON-LINE DEBLOCKING AND BLOCKING CONTROL METHOD FOR EXTRA-HIGH VOLTAGE DIRECT CURRENT TRANSMISSION PROJECT CONVERTER
Document Type and Number:
WIPO Patent Application WO/2015/090100
Kind Code:
A1
Abstract:
An on-line deblocking and blocking control method for extra-high voltage direct current transmission project converter; through control of a firing angle of an SCA shielding pole layer,, a self-calculation trigger angle is outputted, allowing the voltage across two ends of a valve group to be zero; at the same time tracking current of the valve group using a PI regulator, pulling open a bypass breaker BPS after the current in the bypass breaker BPS is reduced to a breaking capacity so as to complete an on-line deblocking process of the valve group. In a blocking process, transfer of direct current is completed by limiting the firing angle outputted by a current control amplifier, and then implementing a by-pass pair and blocking, thus achieving blocking of the valve group online. The method has faster deblocking and blocking speed, a smaller transient state (overvoltage, overcurrent) in a start process, has a smaller reactive power impact on an alternating current system, while also ensuring a smoother change process of voltage, current, active power and reactive power in the deblocking and blocking process, and is simpler in control logic.

Inventors:
LI YANMEI (CN)
LI TAI (CN)
LI SHAOHUA (CN)
WEI WEI (CN)
Application Number:
PCT/CN2014/087808
Publication Date:
June 25, 2015
Filing Date:
September 29, 2014
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
STATE GRID CORP CHINA (CN)
XJ GROUP CORP (CN)
XJ ELECTRIC CO LTD (CN)
International Classes:
H02J3/36; H02J1/00
Foreign References:
CN103647300A2014-03-19
CN103441487A2013-12-11
CN202068184U2011-12-07
Other References:
DAI, CHENRONG: "Analysis on the control of Converter Entry/Exist for ±800kV UHVDC Project", TECHNOLOGY INNOVATION AND APPLICATION, no. 34, 31 December 2012 (2012-12-31), pages 154
DAI, CHENRONG: "Analysis on the control of Converter Entry/Exist for ± 800kV UHVDC Project", TECHNOLOGY INNOVATION AND APPLICATION, no. 34, 31 December 2012 (2012-12-31), pages 154
WANG, QING ET AL.: "Simulation Study on Control Strategy for Balanced Steady Operation and Entry/Exist of Dual 12-Pulse Converter Groups in ±800 kV DC Transmission Project", POWER SYSTEM TECHNOLOGY, vol. 31, no. 17, 5 September 2007 (2007-09-05)
LI, XINNIAN ET AL.: "Analysis on the Strategy of Converter Entry/Exist for Xiangjiaba to Shanghai UHVDC Project", HIGH VOLTAGE ENGINEERING, vol. 37, no. 5, 31 May 2011 (2011-05-31), pages 1235 - 1236
Attorney, Agent or Firm:
ZHENGZHOU RUIXIN INTELLECTUAL PROPERTY AGENCY CO., LTD (CN)
郑州睿信知识产权代理有限公司 (CN)
Download PDF: