Decision letter for "Relative location of voltage sags source at the point of common coupling of constant power loads in distribution systems"

2020 ◽  
Keyword(s):  
Distribution Systems ◽  
Voltage Sags ◽  
Relative Location ◽  
Constant Power ◽  
Point Of Common Coupling ◽  
Constant Power Loads ◽  
Common Coupling

A New Fault-Positions Method Based on Interpolation for the Area of Vulnerability to Voltage Sags

2013 ◽  
Vol 325-326 ◽  
pp. 681-686
Author(s):  
Shuang Ya Zhou ◽  
Shun Tao ◽  
Xiang Ning Xiao ◽  
Chao Luo ◽  
Xiao Chen Zhen
Keyword(s):  
Power System ◽  
Short Circuit ◽  
New Method ◽  
Voltage Sag ◽  
Voltage Sags ◽  
Regional Power ◽  
Short Circuit Calculation ◽  
Point Of Common Coupling ◽  
Transformer Winding ◽  
Common Coupling

The area of vulnerability (AOV) of point of common coupling (PCC) can directly reflect the issue of voltage sag caused by faults in power system. In order to calculate the area of vulnerability more accurately and faster, this paper proposes a new fault positions method based on interpolation, which overcomes the blindness of setting fault points. The influence of transformer winding connections on voltage sag is also taken into account. Short-circuit calculation is adopted and transfer matrix representing the transfer law of transformer on voltage sag is deduced firstly. Then, the principle and implementation flow of the new method are presented in detail. Finally, the new method is applied to a regional power system of China, and graphic result of the area of vulnerability is displayed under balanced and unbalanced faults.

scholarly journals Control Strategy for a Grid Connected Converter in Active Unbalanced Distribution Systems

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1362
Author(s):  
Boris Dumnic ◽  
Bane Popadic ◽  
Dragan Milicevic ◽  
Nikola Vukajlovic ◽  
Marko Delimar
Keyword(s):  
Power Systems ◽  
Experimental Verification ◽  
Control Strategy ◽  
Distribution Systems ◽  
System Stability ◽  
Control Technique ◽  
Distributed Resources ◽  
Abc Classification ◽  
Point Of Common Coupling ◽  
Common Coupling

The development in distributed energy resources technology has led to a significant amount of non-linear power electronics converters to be integrated in the power system. Although this leads to a more sustainable system, it also can have adverse impacts on system stability and energy power quality. More importantly, the majority of the distribution power systems currently are unbalanced (with asymmetrical voltages) due to load unbalance, while the most common fault types are unbalanced grid faults that can have many adverse effects on distributed resource operations. In that regard, proper control of the grid connected converters in active unbalanced distribution systems will become very important. This paper aims to present the behavior of the advanced grid connected converter control technique under different voltage states at the point of common coupling (according to the ABC classification). The main insufficiencies of the classical control technique will be highlighted, while the paper will propose an appropriate solution for mitigation of negative sequence currents under asymmetrical voltages at the point of common coupling. An extensive experimental verification of the proposed techniques is performed using an advanced laboratory prototype for research in grid integration of distributed resources. The experimental verification clearly demonstrates the benefits offered by the advanced control strategy.

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