Design and optimization of LCL-VSC grid-tied converter having short circuit fault current limiting ability

2017 ◽  
Author(s):  
Mengqi Liu ◽  
Haijun Liu ◽  
Zhikai Wang
Keyword(s):  
Short Circuit ◽  
Fault Current ◽  
Design And Optimization ◽  
Current Limiting ◽  
Short Circuit Fault

scholarly journals Influence Analysis of Current Limiting Reactor on Pole-to-Pole Short Circuit Fault in DC Distribution System

2021 ◽  
Vol 256 ◽  
pp. 01032
Author(s):  
Zhenyu Wang ◽  
Shouxiang Wang ◽  
Qi Liu ◽  
Chunyu Zhang ◽  
Qianyu Zhao ◽  
...  
Keyword(s):  
Distribution System ◽  
Short Circuit ◽  
Fault Current ◽  
Capacitor Discharge ◽  
Fault Type ◽  
Dc Distribution ◽  
Current Limiting ◽  
Fault Mechanism ◽  
Short Circuit Fault ◽  
A Current

With the development of power electronic technology, flexible DC distribution system has gradually become a research hotspot. Pole-to-pole short circuit fault is the most serious fault type in DC distribution system. When pole-to-pole short circuit fault occurs in DC side, it will produce a large fault current, which will cause serious harm to DC distribution system. Therefore, it is urgent to install current limiting reactor to limit fault over-current. Aiming at the DC distribution system based on half bridge MMC, this paper analyses the fault mechanism and fault characteristics of pole-to-pole short circuit fault, studies the current limiting effect of the installation position and capacity of current limiting reactor on fault current, and carries out simulation verification in PSCAD / EMTDC platform. The analysis and simulation results show that installing a current limiting reactor at the outlet of the DC side can reduce the peak value of capacitor discharge current, and installing a current limiting reactor at the outlet of the AC side can reduce the overall amplitude of fault current.

Current Limiting Reactor's Reactance Value Selection Based on Short-Circuit Transient Analysis

2013 ◽  
Vol 722 ◽  
pp. 223-227
Author(s):  
Tie Ying Zhao ◽  
Yan Wen Wang
Keyword(s):  
Transient Process ◽  
Transient Analysis ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Engineering Calculation ◽  
Calculation Formula ◽  
Current Limiting ◽  
Current Change ◽  
Short Circuit Fault ◽  
A Current

Current limiting reactor can increase systems short circuit impedance so as to limit short circuit current. Current limiting reactor is directly involved in whole short circuit process when a short circuit fault occurs in a power system, which makes short-circuit current change more complex. Short circuit current level is affected by current limiting reactors parameters; a current limiting reactor with proper impedance value can maintain short-circuit current at an acceptable range. A short circuit transient process of a distributing network with current limiting reactor was analyzed, and the formula of current changing in short circuit transient process was deduced; according to the current changing formula, an engineering calculation formula of current limiting reactors impedance was derived. The case calculation shows that current limiting reactor meeting the need of the engineering calculation formula can reach the system current limiting requirement.

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