Abstract: A method for checking a medium-term and long-term maintenance plan of a power grid. A predicted load value and one or more historical load values of a power grid are acquired and clustered through a clustering algorithm, and a historical moment at which a historical load value is in a same cluster as the predicted load value and has a largest load value is selected as a target historical moment. A power grid operation mode model at the target historical moment is acquired, and the power grid operation mode model is updated according to the maintenance plan and open loop point information by using a full wiring approach to obtain a future-state power grid operation mode model. Ground state power flow data of the power grid are calculated based on the operation mode model, and safety check is carried out according to a preset ground state power flow limit.
Type:
Application
Filed:
August 25, 2021
Publication date:
November 30, 2023
Applicants:
China Electric Power Research Institute, State Grid Shanxi Electric Power Research Institute
Inventors:
Yuxuan LI, Chuancheng ZHANG, Sai DAI, Hui CUI, Qiang DING, Lixin LI, Qiang LI, Yi PAN, Zhi CAI, Yueshuang BAO, Xinyuan LIU, Huiping ZHENG, Wei HAN, Wei WANG, Lei WANG, Jinghua YAN, Bin HAN, Xiaojing HU, Bo LI, Guodong HUANG, Dan XU, Jiali ZHANG, Weigang LI
Abstract: A device and method for evaluating long-term operation of a transformer oil pump. An inlet of an oil pump is connected to an outlet of an oil tank through an oil pipe, and an outlet of the oil pump is connected to an inlet of the oil tank through an oil pipe. A pressure gauge is provided on the oil pipe to the inlet and the outlet of the oil pump, respectively. An ultra-high-frequency (UHF) sensor is provided on an inner wall of an oil pipe close to the oil pump. A pressure difference between the oil pipes to the inlet and to the outlet of the oil pump is monitored. A three-phase unbalanced current of a stator winding is monitored. The vibration of the oil pump is monitored. The rotor-to-stator rub is monitored. Based on the above inspection, a long-term health status of the oil pump is determined.
Type:
Grant
Filed:
August 14, 2020
Date of Patent:
June 13, 2023
Assignee:
STATE GRID SHANXI ELECTRIC POWER RESEARCH INSTITUTE
Inventors:
Hua Yu, Guodong Li, Wei Wang, Hong Liu, Guangqi Mu, Aimin Wang, Tao Jin, Jichong Liang, Haipeng Wang, Yansong Li, Hai Zhang, Zhumao Lu, Lu Bai, Shan Lu, Yanchun Li, Xinwei Wang
Abstract: Provided in the present disclosure are an IGBT device backside structure and a preparation method therefor, and an IGBT device, the IGBT device backside structure comprising a buffer layer, the buffer layer comprising a first activation efficiency buffer area corresponding to an active area of the IGBT device and a second activation efficiency buffer area corresponding to a terminal area of the IGBT device, the activation efficiency of the first activation efficiency buffer area being less than the activation efficiency of the second activation efficiency buffer area.
Type:
Application
Filed:
June 15, 2021
Publication date:
March 16, 2023
Applicants:
STATE GRID SMART GRID RESEARCH INSTITUTE CO., LTD., STATE GRID SHANXI ELECTRIC POWER RESEARCH INSTITUTE, STATE GRID CORPORATION OF CHINA
Inventors:
Li LI, Rui JIN, Yaohua WANG, Shaohua DONG, Jiang LIU, Mingchao GAO, Junmin WU, Lu BAI, Guanliang LI
Abstract: A device and method for evaluating long-term operation of a transformer oil pump. An inlet of an oil pump is connected to an outlet of an oil tank through an oil pipe, and an outlet of the oil pump is connected to an inlet of the oil tank through an oil pipe. A pressure gauge is provided on the oil pipe to the inlet and the outlet of the oil pump, respectively. An ultra-high-frequency (UHF) sensor is provided on an inner wall of an oil pipe close to the oil pump. A pressure difference between the oil pipes to the inlet and to the outlet of the oil pump is monitored. A three-phase unbalanced current of a stator winding is monitored. The vibration of the oil pump is monitored. The rotor-to-stator rub is monitored. Based on the above inspection, a long-term health status of the oil pump is determined.
Type:
Application
Filed:
August 14, 2020
Publication date:
August 26, 2021
Applicant:
STATE GRID SHANXI ELECTRIC POWER RESEARCH INSTITUTE
Inventors:
Hua Yu, Guodong Li, Wei Wang, Hong Liu, Guangqi Mu, Aimin Wang, Tao Jin, Jichong Liang, Haipeng Wang, Yansong Li, Hai Zhang, Zhumao Lu, Lu Bai, Shan Lu, Yanchun Li, Xinwei Wang