Research on stability characteristics of large power supply through UHV AC channel and control technology improving transmission capacity

2021 ◽  
Author(s):  
P. Wu ◽  
S. Zhang ◽  
J. Zhang ◽  
D. Yang ◽  
X. Chu ◽  
...  
Keyword(s):  
Power Supply ◽  
Transmission Capacity ◽  
Control Technology ◽  
Large Power ◽  
And Control

scholarly journals Hierarchical Coordinated Control Method for Multiload DC Microgrid Units

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Zhigang Zhang ◽  
Jinping Mo
Keyword(s):  
Power Supply ◽  
Control Structure ◽  
Control Method ◽  
Hierarchical Control ◽  
Dc Microgrid ◽  
Large Power ◽  
Electrical Grid ◽  
High Expenditure ◽  
Bidding Mechanism ◽  
And Control

Electricity has become not merely a source of power but also a vital component of our lives in a rapidly changing world. However, according to a World Bank report, 17% of the globe’s population live without power. The key cause for such a huge population not being electrified is the proximity of the central electrical grid system or the high expenditure of installing the grid lines to such remote areas. The notion of a microgrid was first proposed more than a decade ago, but the numerous obstacles it entails have hampered its broad adoption and made it a research focus in recent years. A hierarchical control structure of the microgrid is designed, which is divided into layers according to the control objectives and control time scales of the microgrid, and the hierarchical control structure is realized by using multiagent technology. In the framework of hierarchical control, aiming at the demand of energy coordination and optimization of the microgrid, the operation strategy of the microgrid is proposed in grid-connected and/or off-grid mode. In the grid-connected mode, the large power grid is used for power supply and in the off-grid mode, the load bidding mechanism is introduced to ensure the power supply of important loads. Experiment results reveal the power quality and stability of the system.

scholarly journals Design and Research on Power Systems and Algorithms for Controlling Electric Underground Mining Machines Powered by Batteries

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 4060
Author(s):  
Artur Kozłowski ◽  
Łukasz Bołoz
Keyword(s):  
Power Systems ◽  
Power Supply ◽  
Internal Combustion Engines ◽  
Underground Mining ◽  
Test Stand ◽  
Research Network ◽  
Control Algorithms ◽  
Systems And Control ◽  
And Control ◽  
Supply Systems

This article discusses the work that resulted in the development of two battery-powered self-propelled electric mining machines intended for operation in the conditions of a Polish copper ore mine. Currently, the global mining industry is seeing a growing interest in battery-powered electric machines, which are replacing solutions powered by internal combustion engines. The cooperation of Mine Master, Łukasiewicz Research Network—Institute of Innovative Technologies EMAG and AGH University of Science and Technology allowed carrying out a number of works that resulted in the production of two completely new machines. In order to develop the requirements and assumptions for the designed battery-powered propulsion systems, underground tests of the existing combustion machines were carried out. Based on the results of these tests, power supply systems and control algorithms were developed and verified in a virtual environment. Next, a laboratory test stand for validating power supply systems and control algorithms was developed and constructed. The tests were aimed at checking all possible situations in which the battery gets discharged as a result of the machine’s ride or operation and when it is charged from the mine’s mains or with energy recovered during braking. Simulations of undesirable situations, such as fluctuations in the supply voltage or charging power limitation, were also carried out at the test stand. Positive test results were obtained. Finally, the power supply systems along with control algorithms were implemented and tested in the produced battery-powered machines during operational trials. The power systems and control algorithms are universal enough to be implemented in two different types of machines. Both machines were specially designed to substitute diesel machines in the conditions of a Polish ore mine. They are the lowest underground battery-powered drilling and bolting rigs with onboard chargers. The machines can also be charged by external fast battery chargers.

Guidance, Navigation, and Control Technology Assessment for Future Planetary Science Missions

2015 ◽  
Vol 38 (7) ◽  
pp. 1165-1186 ◽  
Author(s):  
Marco B. Quadrelli ◽  
Lincoln J. Wood ◽  
Joseph E. Riedel ◽  
Michael C. McHenry ◽  
MiMi Aung ◽  
...  
Keyword(s):  
Technology Assessment ◽  
Planetary Science ◽  
Control Technology ◽  
Navigation And Control ◽  
And Control

Experimental Study on the Emergency Ampacity of XLPE Cable and its Application

2014 ◽  
Vol 599-601 ◽  
pp. 931-934
Author(s):  
Xiao Liang Zhuang ◽  
Hai Qing Niu ◽  
Qun Feng Zhang ◽  
Kai Fa Ye ◽  
Guang Hui Sun
Keyword(s):  
Power Supply ◽  
Transmission Capacity ◽  
Design Stage ◽  
Initial Current ◽  
Xlpe Cable ◽  
Lifting Capacity ◽  
Increasing Demand ◽  
Line Design ◽  
The Relationship ◽  
New Distribution

In order to solve the contradiction between the increasing demand of power supplies and the difficulty of building new distribution lines, improving the transmission capacity of existing distribution cables is imperative. Using emergency ampacity can increase cable transmission capacity temporarily. Software of calculation emergency ampacity of distribution cable is developed and experiments are undertaken in this paper. The consistency of calculation and experiments shows that the software could calculate emergency ampacity of distribution cable correctly. By the software, the relationship between emergency ampacity and emergency time & initial status are studied here. The research shows that emergency ampacity is much higher than the continuous ampacity. What’s more, the shorter emergency time is, the higher emergency ampacity will be. The lower initial current is, the higher emergency ampacity will be. The more cable circuit number is, the lower emergency ampacity will be but the stronger lifting capacity will be. If emergency ampacity is considered in cable line design stage, cable cross-section or the number of circuit number could be reduced; and if emergency ampacity is considered in emergency load control, the number and capacity of transferring power supply can be reduced. The application the emergency ampacity of distribution cable will result in a great improvement in economy and reliability of power supply.

Application of PLC Technology in the Control System of Plate Shearing Machine

2013 ◽  
Vol 312 ◽  
pp. 777-781
Author(s):  
Lu Ping Liu
Keyword(s):  
Control System ◽  
Control Technology ◽  
Working Process ◽  
Industrial Manufacturing ◽  
Plc Control ◽  
Machine Control ◽  
And Control

In the modern industrial manufacturing field, PLC plays a very important role. In this paper, through analyzing the working process and control requirements of plate shearing machine and using PLC control technology, the automation design of the plate shearing machine control system is realized.

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