A Prony-based method of locating short-circuit fault in DC distribution system

2013 ◽  
Author(s):  
M.M. Xu ◽  
H.F. Wang ◽  
L.Y. Xiao
Keyword(s):  
Distribution System ◽  
Short Circuit ◽  
Dc Distribution ◽  
Short Circuit Fault

Short-Circuit Fault Protection of a Low Voltage DC Distribution System using Superimposed Current Components

2017 ◽  
Vol 31 (10) ◽  
pp. 86-94
Author(s):  
Saeed Zaman Jamali ◽  
Muhammad Omer Khan ◽  
Syed Basit Ali Bukhari ◽  
Muhammad Mehdi ◽  
Gi-Hyeon Gwon ◽  
...  
Keyword(s):  
Distribution System ◽  
Low Voltage ◽  
Short Circuit ◽  
Fault Protection ◽  
Dc Distribution ◽  
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.

scholarly journals Fault Location Method for DC Distribution Systems Based on Parameter Identification

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1983 ◽  
Author(s):  
Yan Xu ◽  
Jingyan Liu ◽  
Weijia Jin ◽  
Yuan Fu ◽  
Hui Yang
Keyword(s):  
Parameter Identification ◽  
Distribution System ◽  
Distribution Systems ◽  
Fault Location ◽  
Fitness Function ◽  
Short Circuit ◽  
Location Method ◽  
Dc Distribution ◽  
Transition Resistance ◽  
Short Circuit Fault

When a short circuit fault occurs on the DC side line, the fault current reaches the peak within a few milliseconds, and the voltage drops significantly. This phenomenon can cause overcurrent flowing through the DC line, semiconductor devices, and AC side, which is a major threat to the operation of the entire system. To solve this problem, this paper proposes a fault location scheme based on parameter identification. Firstly, the entire DC distribution system is regarded as a graph. The intersections of the distribution system lines are regarded as vertices. The current flow of each line is regarded as a directed edge. The network topology matrix is constructed and a fault type recognition algorithm is proposed based on graph theory. Secondly, the mathematical model of the pole-to-pole short-circuit fault and pole-to-ground short-circuit fault are analyzed with double-ended electrical quantities. Transform the fault location problem into a parameter identification problem, four parameters to be identified are extracted, and the fitness function is constructed separately for two kinds of fault cases. Thirdly, a genetic algorithm (GA) is adopted to identify the value of parameters. Considering the fault types, transition resistance and fault location, the Matlab/Simulink simulation platform is used to simulate 18 fault conditions. The simulation results show that the positioning error of the fault location method is less than 1%, which is not affected by the transition resistance and has strong robustness.

scholarly journals Calculation of Short-Circuit Current in DC Distribution System Based on MMC Linearization

2021 ◽  
Vol 9 ◽  
Author(s):  
Peixiao Sun ◽  
Zaibin Jiao ◽  
Hanwen Gu
Keyword(s):  
Distribution System ◽  
Short Circuit ◽  
Analytical Calculation ◽  
Short Circuit Current ◽  
Modeling And Analysis ◽  
Dc Distribution ◽  
Proposed Model ◽  
Linearized Model ◽  
Comparison Of The Results ◽  
Important Basis

The calculation of the short-circuit current is an important basis for fault detection and equipment selection in the DC distribution system. This paper proposes a linearized model for modular multilevel converter (MMC) considering different grounding methods and different failure scenarios. This model can be used in different fault conditions before MMC’s block. Under different fault forms, the model has different manifestations. This paper analyzes and models the DC distribution network with two types of faults: inter-pole short circuit and single-pole grounding short circuit. Among them, the modeling and analysis of single-pole grounding short-circuit uses the method of common- and differential-mode (CDM) transformation. To solve such a model, an analytical calculation method is proposed. As a mean of evaluating the effectiveness and accuracy of the proposed model, the analytical calculation solution is compared to the solution produced by PSCAD/EMTDC. A comparison of the results reveals the efficacy of the proposed model.

scholarly journals Study on DC Breaker Fault Current and Its Limiting Method of Multiterminal Flexible DC Distribution System

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 859 ◽  
Author(s):  
Jinghan Zhang ◽  
Yuqun Gao ◽  
Fanglei Xiao ◽  
Fang Guo ◽  
Xinwei Li ◽  
...  
Keyword(s):  
Distribution System ◽  
High Reliability ◽  
Short Circuit ◽  
Generation Mechanism ◽  
Fault Current ◽  
Operating Modes ◽  
Dc Distribution ◽  
Study Results ◽  
Current Limiting ◽  
Dc Breaker

The multiterminal flexible DC (MTDC) distribution system has become a hot research topic for its advantages such as new energy load accessibility and high reliability of power supply. However, the fault current during short-circuit faults will be more complicated and serious because of the multiple operating modes and specific converter structure in MTDC distribution system. The high fault current will affect the safety of equipment and system operation. As a result, it is necessary to study the fault current generation mechanism and current limiting method of the DC distribution system. In this paper, the generation mechanism, transient characteristics, and the influencing factors of the fault current in the DC breaker during the short-circuit faults are analyzed by theoretical analysis and simulations separately based on a ±10 kV three-terminal flexible DC distribution system. The current limiting devices are analyzed, and its configuration position and parameter calculation method are proposed. On this basis, the parameters of the current limiting reactor and its effects on each position are analyzed by electromagnetic transient simulations. The current limiting scheme is proposed and its reliability is verified. The study results can provide some reference for overcurrent analysis and current limiting measures of the multiterminal DC distribution system.

scholarly journals Current Protection Applicability Analysis of Flexible DC Power Supply Network

2021 ◽  
Author(s):  
Yuan Gao ◽  
Bingyuan Yang ◽  
Dongsheng Li
Keyword(s):  
Distribution System ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Operation Performance ◽  
Performance Simulation ◽  
Backup Protection ◽  
Dc Distribution ◽  
Passive Network ◽  
Current Characteristics ◽  
Level Converter

In the flexible AC/DC distribution system supplying passive network, when the modular multi-level converter (MMC) inverter AC line fault occurs, the MMC short-circuit current amplitude is greatly affected by the control strategy, which may affect the operation performance of three-stage current protection. In view of this, a flexible AC/DC distribution network system supplying power to the passive network is built on the RTDS platform, and then the AC fault traverse strategy is designed in the MMC controller. Based on the thinking of coordinated control and protection of the fault through the strategy into two cases with no input to higher current protections performance simulation contrast, the simulation results show that asymmetric fault occurred when MMC inverter AC line, under the effect of communication failure through the strategy, the current main protection I, II period of refusing action, only by this line nearly backup protection current section III delay removal of fault. The three-stage current protection based on the fault current characteristics of pure AC system has poor action performance and is no longer suitable for the AC line of MMC inverter station.

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