Title:
VOLTAGE AND CURRENT CONTROL METHOD AND DEVICE FOR DIRECT-CURRENT POWER TRANSMISSION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/109841
Kind Code:
A1
Abstract:
Disclosed in the present invention is a voltage and current control method for a direct-current power transmission system. The method comprises: calculating a direct-current voltage reference value of a voltage source converter of a direct-current voltage control end, on the basis whether a direct-current voltage end of a direct-current electrode of a direct-current power transmission system actually controls a direct-current voltage; using 1/2 of the calculated direct-current voltage reference value of the voltage source converter as a bridge arm voltage direct-current offset, calculating a difference between the direct-current voltage reference value of the voltage source converter and a measured direct-current voltage value, and inputting the difference into a direct-current voltage control outer loop of the voltage source converter to perform closed-loop control, so as to control the direct-current voltage or the direct current of the direct-current electrode. Correspondingly, also provided is a voltage and current control device for the direct-current power transmission system. By the means of the present invention, the direct-current voltage and the direct current of the direct-current power transmission system provided with the voltage source converter can be effectively controlled.
Inventors:
LU JIANG (CN)
LU YU (CN)
DONG YUNLONG (CN)
WANG YONGPING (CN)
TIAN JIE (CN)
WANG NANNAN (CN)
ZHAO WENQIANG (CN)
HU ZHAOQING (CN)
WANG KE (CN)
XIAO JIANMIN (CN)
LU YU (CN)
DONG YUNLONG (CN)
WANG YONGPING (CN)
TIAN JIE (CN)
WANG NANNAN (CN)
ZHAO WENQIANG (CN)
HU ZHAOQING (CN)
WANG KE (CN)
XIAO JIANMIN (CN)
Application Number:
PCT/CN2018/117937
Publication Date:
June 13, 2019
Filing Date:
November 28, 2018
Export Citation:
Assignee:
NR ELECTRIC CO LTD (CN)
NR ENGINEERING CO LTD (CN)
NR ENGINEERING CO LTD (CN)
International Classes:
H02J3/36
Foreign References:
| CN107769241A | 2018-03-06 | |||
| CN105762824A | 2016-07-13 | |||
| CN106505641A | 2017-03-15 | |||
| CN105790249A | 2016-07-20 | |||
| US20150155716A1 | 2015-06-04 |
Other References:
RAO, HONG ET AL.: "Simulation research of control and protection system for the modular multi-level converter based VSC-HVDC", 14TH NATIONAL ACADEMIC CONFERENCE ON PROTECTION AND CONTROL, 31 October 2013 (2013-10-31), pages 1 - 6, XP009519989
See also references of EP 3681006A4
See also references of EP 3681006A4
Attorney, Agent or Firm:
NANJING JINGWEI PATENT & TRADEMARK AGENCY CO., LTD (CN)
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