Thyristor valves for high voltage direct current (HVDC) power transmission

2015 ◽  
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Power Transmission ◽  
High Voltage Direct Current

scholarly journals Feasibility Evaluation on Elimination of DC Filters for Line-Commutated Converter-Based High-Voltage Direct Current Projects in New Situations

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5770
Author(s):  
Xiaodong Li ◽  
Zheng Xu
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Power Transmission ◽  
Rapid Development ◽  
Maintenance Cost ◽  
Attractive Alternative ◽  
Stable Operation ◽  
Long Distance ◽  
High Voltage Direct Current ◽  
Feasibility Evaluation

The line-commutated converter (LCC)-based high voltage direct current (HVDC) technology has been widely applied on long-distance and bulk-capacity power transmission occasions. Due to the terrible interferences in the vicinity of communication lines, DC filters (DCFs) are always installed to mitigate the interferences within acceptable levels for almost all in-service overhead line transmission LCC-HVDC schemes. With the rapid development of the communication technology, however, the anti-interference capability of the telephone system has been remarkably improved. Thus, the original purpose of employing DCFs has been virtually absent, and the necessity of the DCFs shall be re-evaluated in sufficient depth not only for new LCC-HVDC projects, but also in the case of refurbishment of older projects. To demonstrate this constructive topic, this paper carries out a commercial ±800 kV/8000 MW LCC-HVDC project as an illustrative example to analyze and discuss those crucial aspects, which may influence the LCC-HVDC stable operation and reliability after removing the DCFs. Then, the paper studies the harmonic voltage/current stresses of the DC equipment, the DC loop low-order harmonic resonances, and the overvoltage under the switching surge and lightning stroke. Finally, it is concluded that the DCF elimination mainly affects the harmonic steady-state stresses of the DC equipment, but has little influence on the transient stresses. For the refurbishment of older projects, the evaluation on the cost between the DCFs’ maintenance cost and the equipment modification is needed for the DCFs’ elimination. For new LCC-HVDC projects, the DCFs’ elimination or at least simplification may be a more economical and attractive alternative, thereby reducing the footprint and cost.

Application of GWS-1 Remote Equipment in the UHVDC Projects

2014 ◽  
Vol 590 ◽  
pp. 490-494
Author(s):  
Feng Long Li ◽  
Wei Wei Jin ◽  
Ke Wei Pang ◽  
Ling Zhang ◽  
Rui Zhang ◽  
...  
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Power Transmission ◽  
Present Situation ◽  
High Voltage Direct Current ◽  
Temperature Problem ◽  
Function Design ◽  
Commercial Operation ◽  
Communication Capability ◽  
Design And Application

The present situation of the UHVDC (ultra high voltage direct current) power transmission project is introduced, based on ±800kV UHVDC power transmission project put into commercial operation, the function design and application of GWS-1 remote equipment are carried out, the communication capability on IEC61850 is supported, the temperature problem of HP rx2660 is resolved, the GWS-1 remote equipment could meet the requirement of the UHVDC power transmission project is approved, and there is guiding significance on the research of RCI of UHVDC power transmission project.

scholarly journals Calculating the Interface Flow Limits for the Expanded Use of High-Voltage Direct Current in Power Systems

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2863
Author(s):  
Sangwook Han
Keyword(s):  
Power System ◽  
High Voltage ◽  
Direct Current ◽  
Limit Analysis ◽  
Large Scale ◽  
Power Transmission ◽  
Metropolitan Areas ◽  
High Voltage Direct Current ◽  
Flow Limit ◽  
Current Lines

Although loads are increasingly becoming concentrated in metropolitan areas, power generation has decreased in metropolitan areas and increased in nonmetropolitan areas; hence, power transmission must occur through interface lines. To achieve this, additional transmission lines must be secured because the existing interface lines have reached their large-scale power transmission limits. The Korea Electric Power Corporation has installed many high-voltage direct current lines, thereby impacting the determination of interface power flow limits. These serve as the basis for system operations. However, knowledge of operating high-voltage direct current lines as a simple transmission line in a single power system is lacking. The effects of high-voltage direct current and its related parameters for interface flow limit analysis remain unclear. Furthermore, whether high-voltage direct current should be included in the selection of the interface lines that serve as the basis for interface flow remains unclear. In addition, whether the high-voltage direct current line faults should be included in the contingency list for determining the interface flow limits has not been considered. Additionally, it has not been determined whether to operate the DC tap when performing the simulation This study addresses these issues and determines the conditions that are necessary for determining the interface flow limits when a high-voltage direct current transmission facility has been installed in a land power system. The results conclude how to reflect the above conditions reasonably when performing the interface flow limit analysis on a system that includes the HVDC lines.

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