Title:
SAG DOMAIN RECOGNITION METHOD CONSIDERING UNCERTAINTY OF LOAD SENSITIVITY
Document Type and Number:
WIPO Patent Application WO/2020/232824
Kind Code:
A1
Abstract:
A sag domain recognition method considering the uncertainty of load sensitivity, comprising the following steps: performing power flow calculation to acquire the voltage amplitude of a system node before a fault; calculating sequence impedances; calculating a residual voltage of each bus fault; obtaining upper and lower limits of an uncertainty interval of a sensitive load according to an existing voltage tolerance curve to form a discriminant matrix; calculating a line critical point according to the discriminant matrix and the lower and upper limits of the uncertainty interval of the sensitive load; and traversing all lines and all uncertain spaces, and outputting two sag domain recognition results corresponding to the upper and lower limits of the uncertainty interval of the sensitive load. Considering the uncertainty interval of the sensitive load, a sag domain that is closer to an actual project is described, overcoming the defect that the existing sag domain recognition method fails to consider that sensitive loads have different tolerance to voltage sags, and fixing the sag domain by means of a definite boundary fails to take all sag domain critical points into account.
More Like This:
Inventors:
LI XIN (CN)
WU LIHUI (CN)
LUO RONGBO (CN)
QIU TAIHONG (CN)
FAN XINMING (CN)
DONG DI (CN)
SONG ANQI (CN)
CHEN BANGFA (CN)
WANG JUNBO (CN)
LI HUI (CN)
WU LIHUI (CN)
LUO RONGBO (CN)
QIU TAIHONG (CN)
FAN XINMING (CN)
DONG DI (CN)
SONG ANQI (CN)
CHEN BANGFA (CN)
WANG JUNBO (CN)
LI HUI (CN)
Application Number:
PCT/CN2019/097841
Publication Date:
November 26, 2020
Filing Date:
July 26, 2019
Export Citation:
Assignee:
GUANGDONG POWER GRID CO LTD (CN)
FOSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID CO LTD (CN)
FOSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID CO LTD (CN)
International Classes:
G01R31/08
Foreign References:
| CN107886187A | 2018-04-06 | |||
| CN104376403A | 2015-02-25 | |||
| CN106324320A | 2017-01-11 | |||
| CN109298244A | 2019-02-01 | |||
| US20150340084A1 | 2015-11-26 |
Other References:
马明 等 (MA, MING ET AL.): "一种基于临界点法的电压暂降域混合识别方法 (A voltage sag domain hybrid identification method based on critical-point method)", 供用电 (DISTRIBUTION & UTILIZATION), no. 04, 30 April 2019 (2019-04-30), ISSN: 1006-6357, DOI: 20200119142137X
Attorney, Agent or Firm:
YOGO PATENT & TRADEMARK AGENCY LIMITED COMPANY (CN)
Download PDF: