Title:
SMALL HYDROPOWER STATION RAPID GRID CONNECTION METHOD CONSIDERING DEVIATION AND TREND CHANGES
Document Type and Number:
WIPO Patent Application WO/2021/114804
Kind Code:
A1
Abstract:
A small hydropower station rapid grid connection method considering deviation and trend changes. A small hydropower station comprises a voltage transformer and a control system; the voltage transformer transmits collected small hydropower station side voltage ya and distribution network voltage yb to the control system; the control system compares the small hydropower station side voltage ya with the distribution network voltage yb, and the control system controls reclosing starting of the small hydropower station according to the comparison result. Collection points are randomly selected, so that the reliability of the method is improved; the difference value between the small hydropower station side voltage ya and the distribution network voltage yb is compared, then operation is carried out, and when Y≤0.05*(|ya1|+...+|yan|) and the change trend of the small hydropower station side voltage ya is similar to the change trend of the distribution network voltage yb, the grid connection condition is met, so that the grid connection method is simple, and the grid connection time is short; and meanwhile, whether the formula y=|yb-ya|>0.05*ya is satisfied or not is determined, so that voltage sampling values of the small hydropower station side voltage ya and the distribution network voltage yb can be prevented from being subjected to data pollution; and meanwhile, an overall trend comparison step is set, so that the reliability of the method can be improved.
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Inventors:
LI JIAQI (CN)
LIN YING (CN)
ZHENG SHAOHUA (CN)
CHEN HUI (CN)
WANG ZHIDONG (CN)
ZHANG ZIFAN (CN)
WANG GAN (CN)
CHEN ZHIFENG (CN)
LIN YING (CN)
ZHENG SHAOHUA (CN)
CHEN HUI (CN)
WANG ZHIDONG (CN)
ZHANG ZIFAN (CN)
WANG GAN (CN)
CHEN ZHIFENG (CN)
Application Number:
PCT/CN2020/116365
Publication Date:
June 17, 2021
Filing Date:
September 21, 2020
Export Citation:
Assignee:
GUANGZHOU COLLEGE SOUTH CHINA UNIV TECHNOLOGY (CN)
International Classes:
H02J3/40; H02J3/00; H02J3/38
Foreign References:
| CN111130144A | 2020-05-08 | |||
| CN101752875A | 2010-06-23 | |||
| CN205429687U | 2016-08-03 | |||
| CN109599902A | 2019-04-09 | |||
| EP3484009A1 | 2019-05-15 |
Attorney, Agent or Firm:
GUANGZHOU HUIYUZHONGCHENG INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)
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