Title:
CONTROL METHOD AND SYSTEM FOR OUTPUT TRANSFORMER OF THYRISTOR CURRENT SOURCE-TYPE STATIC FREQUENCY CONVERTER
Document Type and Number:
WIPO Patent Application WO/2024/031857
Kind Code:
A1
Abstract:
Disclosed in the present invention are a control method and system for an output transformer of a thyristor current source-type static frequency converter. The method comprises: on the basis of determining the resistance of an output loop at the high-voltage side of the frequency converter, determining a relation between the output amplitude of the direct current at the high-voltage side and the maximum duration; further determining a relation between the starting torque of the frequency converter and the maximum duration; and finally calculating the maximum angle of rotation of the unit that can be dragged by the frequency converter when the frequency converter directly operates together with the output transformer, and determining an operation mode of a bypass knife switch at the output side of the frequency converter. According to the present invention, the alternating current rated parameters of the transformer are applied to direct current transformation, and on this basis, the rotation angle of the unit which can be dragged by the frequency converter before the transformer is saturated is determined, so as to determine whether the unit needs to be started in a bypass output transformer mode or not, thereby greatly reducing the number of times of opening and closing of the bypass knife switch, effectively avoiding a starting failure caused by an anomaly of the bypass knife switch when the frequency converter starts the unit, and increasing the success rate of starting the unit.
Inventors:
WANG XIAOHONG (CN)
YANG HEMIN (CN)
TENG XIANLIANG (CN)
HU JING (CN)
JIAN YOUZONG (CN)
YUAN XIAOQI (CN)
GUO HAISHAN (CN)
HUO ZHIXIN (CN)
WU YANFEI (CN)
ZHANG YIN (CN)
TIAN ANMIN (CN)
SHI SHENGDAN (CN)
JI TONGJUN (CN)
WANG GUOYU (CN)
XU WEI (CN)
DI HUIFANG (CN)
YANG HEMIN (CN)
TENG XIANLIANG (CN)
HU JING (CN)
JIAN YOUZONG (CN)
YUAN XIAOQI (CN)
GUO HAISHAN (CN)
HUO ZHIXIN (CN)
WU YANFEI (CN)
ZHANG YIN (CN)
TIAN ANMIN (CN)
SHI SHENGDAN (CN)
JI TONGJUN (CN)
WANG GUOYU (CN)
XU WEI (CN)
DI HUIFANG (CN)
Application Number:
PCT/CN2022/131679
Publication Date:
February 15, 2024
Filing Date:
November 14, 2022
Export Citation:
Assignee:
NARI TECHNOLOGY CO LTD (CN)
International Classes:
H02M5/257; H02P9/08
Domestic Patent References:
| WO2014209127A1 | 2014-12-31 |
Foreign References:
| CN115313884A | 2022-11-08 | |||
| CN104155883A | 2014-11-19 | |||
| CN101621271A | 2010-01-06 | |||
| CN112398379A | 2021-02-23 |
Other References:
WU WEI-LIANG, LIU XI-PING, HUANG CHAO-ZHI, YANG HE-MIN, HU JING: "Research on Static Frequency Start-up Control Technology for Large Pumped Storage Unit", WATER RESOURCES AND POWER., vol. 40, no. 6, 1 June 2022 (2022-06-01), XP093138112, DOI: 1000-7709(2022)06-0196-05
Attorney, Agent or Firm:
NANJING ZONGHENG INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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