Title:
POWER SYSTEM FREQUENCY MEASUREMENT METHOD, BUS VOLTAGE CORRECTION METHOD AND DEVICES
Document Type and Number:
WIPO Patent Application WO/2021/082036
Kind Code:
A1
Abstract:
The present invention relates to a power system frequency measurement method, a bus voltage correction method, and devices, belonging to the technical field of power system frequency measurement. In the present invention, a positive sequence phase voltage is used to calculate the frequency of a power system; for an angle error of a voltage analog quantity caused due to either magnitude flop or neutral point shift, all positive sequence components calculated by means of composition of three-phase voltage phasors can effectively counteract the error and shift therein. Therefore, the frequency measurement method of the present invention is not affected by a voltage zero-crossing point or a harmonic wave, not only being able to accurately measure the frequency of a power system in a steady state, but also effectively solving the problem of large frequency measurement errors caused by voltage jump.
Inventors:
MAO LIN (CN)
YU GAOWANG (CN)
YANG KAI (CN)
GONG YUN (CN)
WANG LI (CN)
YIN MING (CN)
BAI SHENYI (CN)
ZHAO XIAODUO (CN)
LIN LI (CN)
XU SHENGLONG (CN)
ZHANG YANHAI (CN)
WANG HONGJIE (CN)
WEI YANWEI (CN)
MA XIAOYAN (CN)
LI LEI (CN)
ZHENG YEBING (CN)
HU SHUYI (CN)
ZHAO QI (CN)
LI YASHUANG (CN)
FANG CHEN (CN)
YU GAOWANG (CN)
YANG KAI (CN)
GONG YUN (CN)
WANG LI (CN)
YIN MING (CN)
BAI SHENYI (CN)
ZHAO XIAODUO (CN)
LIN LI (CN)
XU SHENGLONG (CN)
ZHANG YANHAI (CN)
WANG HONGJIE (CN)
WEI YANWEI (CN)
MA XIAOYAN (CN)
LI LEI (CN)
ZHENG YEBING (CN)
HU SHUYI (CN)
ZHAO QI (CN)
LI YASHUANG (CN)
FANG CHEN (CN)
Application Number:
PCT/CN2019/116037
Publication Date:
May 06, 2021
Filing Date:
November 06, 2019
Export Citation:
Assignee:
XUCHANG XUJI SOFTWARE TECH CO LTD (CN)
XUJI GROUP CORP (CN)
XUJI ELECTRIC CO LTD (CN)
STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER CO (CN)
STATE GRID CORP CHINA (CN)
XUJI GROUP CORP (CN)
XUJI ELECTRIC CO LTD (CN)
STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER CO (CN)
STATE GRID CORP CHINA (CN)
International Classes:
G01R23/02
Foreign References:
| CN107064630A | 2017-08-18 | |||
| CN108896820A | 2018-11-27 | |||
| CN104360137A | 2015-02-18 | |||
| CN103414184A | 2013-11-27 |
Attorney, Agent or Firm:
ZHENGZHOU RUIXIN INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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