Results 21 to 30 of about 166,217 (209)

Analysis of the impact of construction and operation of pumped-storage power stations on grid companies and the formulation of electricity prices [PDF]

MATEC Web of Conferences, 2021
The pumped storage power station is flexible to start, can realize effective storage of electric energy, and has superior peak and frequency modulation effects, which is beneficial to provide comprehensive benefits of the power system.
Gao Ming, Bian Jiayu, Tian Shoutao, Tan Jing, Chen Lufeng   +4 more
doaj   +1 more source

Liberty, Efficiency, and Law [PDF]

, 1987
In today’s society there is an increasing demand for renewable energy sources such as sun and wind power. These sources are intermittent, and energy storage is therefore needed to ensure a constant power supply.
Dahlqvist, Elin, Karlsson, Elin
core   +3 more sources

Flow characteristics analysis of an extra–high–head pump–turbine with splitter–blades under high pressure-pulsation condition [PDF]

E3S Web of Conferences
The new energy system aims to provide reliable, affordable and sustainable energy, and ultimately achieve carbon neutrality. But the unstable renewable energy sources including wind and solar increase the risk to the grid and the power system. The pumped–
Huang Xingxing, Huang Xiaoying, Bi Huili, Huang Yanqing, Xu Buchao, Wang Zhengwei   +5 more
doaj   +1 more source

Research on variable speed operation of static frequency converter for pumped storage units [PDF]

E3S Web of Conferences, 2021
Constant speed pumped storage unit is widely used, however it cannot adjust the input power when working in the electric mode, and cannot work in the best efficiency when the head of the reservoir changes greatly.
Li Haoyuan, Li Guanjun, Yang Bo, Ji Liantao   +3 more
doaj   +1 more source

Comparative Study on Numerical Calculation of Modal Characteristics of Pump-Turbine Shaft System

Journal of Marine Science and Engineering, 2023
Because a pump-turbine mainly undertakes the role of energy conversion and pumped storage in the field of hydropower engineering, the complex transition process and frequent conversion between different working conditions lead to the increase in the ...
Xuyang Liu, Jiayang Pang, Lei Li, Weiqiang Zhao, Yupeng Wang, Dandan Yan, Lingjiu Zhou, Zhengwei Wang   +7 more
doaj   +1 more source

Repair Technology for Joint Damage of Sealing Cover Plate of Concrete Faced Rockfill Dam [PDF]

E3S Web of Conferences, 2019
In view of damages that are common in anti-seepage coiled joints used in the water-sealing of the concrete faced rockfill dam junction surface, the construction method that uses SK hand scraping polyurea and tire base fabric to quickly repair the broken ...
Cui Zhigang, Sun Zhiheng, Li Meng, Liu Jincheng   +3 more
doaj   +1 more source

Pressure Analysis in the Draft Tube of a Pump-Turbine under Steady and Transient Conditions

Energies, 2021
Pumped-storage power stations play a regulatory role in the power grid through frequent transition processes. The pressure pulsation in the draft tube of the pump-turbine under transient processes is important for safe operation, which is more intense ...
Jing Yang, Yue Lv, Dianhai Liu, Zhengwei Wang   +3 more
doaj   +1 more source

Research on an intelligent monitoring system for the entire tunnel construction process based on IoT and digital twin

International Journal of Metrology and Quality Engineering
There are high-risk problems, such as peripheral rock instability and palm face collapse, during tunnel construction, and the traditional monitoring methods are difficult to meet the safety management needs due to sparse data and lagging response.
Huang Canxin, Wan Liangpeng, Shi Guangyi, Sun Huixiang, Wang Jun, Zhang Chong   +5 more
doaj   +1 more source

Experimental Study of a New Concrete Admixture and Its Function in Filling and Reinforcing Granite Fissures

Geofluids, 2021
A concrete admixture with water retention and superhydrophobic properties was developed according to the high tensile strength, fissure resistance, and antiseepage requirements of concrete linings. Capillary water absorption, early-age anticracking, cube
Songnan Ru, Zuozhou Li, Handong Liu, Huaichang Yu, Chunlei Wei, Guangzhu Hu, Fangfang Xue, Congxian Wang, Jialiang Wang   +8 more
doaj   +1 more source

Analysis of Internal Flow Characteristics of a Startup Pump Turbine at the Lowest Head under No-Load Conditions

Journal of Marine Science and Engineering, 2021
The instability of the no-load working condition of the pump turbine directly affects the grid connection of the unit, and will cause vibration and damage to the components of the unit in severe cases.
Wei Wang, Xi Wang, Zhengwei Wang, Mabing Ni, Chunan Yang   +4 more
doaj   +1 more source