scholarly journals Stability enhancement of power system by simultaneous ac-dc power transmission

2009 ◽  
Vol 6 (12) ◽  
pp. 818-823 ◽  
Author(s):  
K. P. Basu ◽  
Naeem M. H.
Keyword(s):  
Power System ◽  
Power Transmission ◽  
Dc Power ◽  
Stability Enhancement ◽  
Dc Power Transmission

scholarly journals Study on the Key Problems of UHVAC/DC Power Grids with New Generation Large Synchronous Condenser

2018 ◽  
Vol 57 ◽  
pp. 03003
Author(s):  
Xiao Fan ◽  
Zhou Kunpeng ◽  
Wang Tao ◽  
Cao Kan ◽  
Rao Yuze
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Reactive Power ◽  
Power Transmission ◽  
Excitation Control ◽  
Synchronous Condenser ◽  
Dc Power ◽  
Ac Power ◽  
New Generation ◽  
Dc Power Transmission

In order to cope with the great pressure caused by the gradually exhaustion of fossil energy and environmental protection and climate warming, the development and application of the renewable energy has become an important foundation and development direction in the field of energy. However, due to the impact of energy and resource endowment, China’s load center and renewable energy base into the characteristics of long-range reverse distribution, the use of long-distance large-capacity transmission potential is necessary. With the “strong DC system and weak AC system” problem of the company power grid is increasingly prominent, the higher demand of dynamic reactive power support is put forward in the UHV DC power transmission project. Then, the large-capacity dynamic reactive power of new generation synchronous condenser is large-scale built up in the UHV DC/AC power system. Due to the high requirement of response speed and capacity in the UHV DC power transmission, the structure, dynamic characteristics, excitation control and relay protection and other aspects of the large synchronous condenser are different from generators and traditional synchronous condenser. Based on this, the dynamic reactive power demand of UHV DC power system is analyzed in this paper. Then, the main situation of large synchronous condenser is considered. In addition, the key points of the excitation control system and protection system are also discussed in this paper. There are important theoretical and practical significance for the safe and reliable operation of the UHV DC/AC power system.

Stability Improvement of Power System by Simultaneous Ac–Dc Power Transmission

2011 ◽  
Vol 3 (5) ◽  
pp. 280-284
Author(s):  
M.Sai Sesha M.Sai Sesha ◽  
◽  
Madhusudanarao.r Madhusudanarao.r ◽  
V.S.N.Narasimharaju V.S.N.Narasimharaju
Keyword(s):  
Power System ◽  
Power Transmission ◽  
Dc Power ◽  
Dc Power Transmission

scholarly journals The Possibility of Enhanced Power Transfer in a Multi-Terminal Power System through Simultaneous AC–DC Power Transmission

Electronics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 108
Author(s):  
Shaista Parveen ◽  
Salman Hameed ◽  
Hafizur Rahman ◽  
Khaliqur Rahman ◽  
Mohd Tariq ◽  
...  
Keyword(s):  
Power System ◽  
Power Transmission ◽  
Transmission System ◽  
Simulation Software ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Transmission Network ◽  
Power Transfer ◽  
Dc Power ◽  
Dc Power Transmission

The feasibility of power transfer enhancement, through simultaneous AC–DC power transmission in a two-terminal transmission network, has been proposed earlier by the authors, and the concept is well established. To meet the increase in demand for electricity, a new technique is proposed in this article to increase the use of existing transmission lines in addition to independent control of AC and DC power flow. This paper extends the concept to a three-terminal transmission network by considering a power tapping from the middle of the line. DC is also superimposed in the already existing three-terminal AC transmission system. In the proposed topology, a multi-terminal simultaneous AC–DC system is used, which is integrated with a zig-zag transformer and more than two voltage source converter (VSC) stations. Each terminal may represent an area of the power system. Anyone/two-terminal(s) may act as sending end, whereas the remaining two/one terminal(s) may act as receiving end. Power can flow in either direction through each segment of the transmission system. At sending end, VSC converts a part of AC to DC and injects it into the neutral of the zig-zag transformer. On receiving terminal, DC power is tapped from neutral of zig-zag transformer and fed to VSC for conversion back to AC. The concept is verified in the digital simulation software PSCAD/EMTDC.

scholarly journals Heat Leak Measurement of the 200 m Superconducting DC Power Transmission System at Chubu University

2012 ◽  
Vol 36 ◽  
pp. 1366-1371 ◽  
Author(s):  
Hirofumi Watanabe ◽  
Yury Ivanov ◽  
Jian Sun ◽  
Makoto Hamabe ◽  
Toshio Kawahara ◽  
...  
Keyword(s):  
Power Transmission ◽  
Transmission System ◽  
Heat Leak ◽  
Dc Power ◽  
Power Transmission System ◽  
Dc Power Transmission
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