Topic
Power-system protection
About: Power-system protection is a research topic. Over the lifetime, 6353 publications have been published within this topic receiving 117961 citations.
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22 May 2016
TL;DR: In this article, a ring-type wind turbine-based DC microgrid is taken as the object of study and the transient characteristics of VSC as well as the system under DC line fault are analyzed based on which the protection scheme of current differential protection as the main protection and undervoltage protection as a backup one is proposed.
Abstract: DC fault location and protection is the key problem to be solved of DC microgrid in spite of the fact that it has become the ideal networking mode of distributed generation due to its obvious advantages. In this paper, a ring-type wind turbine-based DC microgrid is taken as the object of study and the transient characteristics of VSC as well as the system under DC line fault are analyzed based on which the protection scheme of current differential protection as the main protection and under-voltage protection as the backup one is proposed. In this method, the power supply security of the DC microgrid system is guaranteed by detecting the input and output currents of the DC transmission lines through which the corresponding differential currents can be calculated to locate and isolate the fault lines. Simulations are conducted on MATLAB/Simulink and the results show that the protection system can response rapidly to the line differential current value under short circuit fault, so as to realize the DC short circuit fault protection of DC microgrid system.
30 citations
TL;DR: In this paper, the modal voltage and current are decomposed by Daubechies 4 wavelet in both time and frequency to obtain the transient energy of the fault that is employed to identify the fault position.
30 citations
TL;DR: In this article, the authors introduced a three-phase arc fault model for low-voltage ac systems derived by probability method according to the characteristics of 3-phase fault arcs.
Abstract: A lot of three-phase arc fault experiments show that arc voltages of three-phase arc fault in low-voltage ac systems vary stochastically. These arc voltages cannot be expressed exactly by formula. This paper introduces a three-phase arc fault model for low-voltage ac systems derived by probability method according to the characteristics of three-phase fault arcs. This model can be used to calculate minimum three-phase arcing fault current for setting the relay.
30 citations
TL;DR: In this paper, a graph-theory-based algorithm automatically assigns input currents to their proper differential protection zone, based on these assignments, the protection scheme trips the minimal number of breakers to isolate a fault.
Abstract: This paper presents an advanced protection system design for the main power system of an all-electric ship. Considering the unique characteristics of shipboard power systems, current differential scheme has been chosen as the most reliable primary protection scheme. A graph-theory-based algorithm automatically assigns input currents to their proper differential protection zone. Based on these assignments, the protection scheme trips the minimal number of breakers to isolate a fault. This connection between the graph-theory algorithm and breaker assignments enables the protection system to be adaptive with different configurations. As an extension to these fast fault detection and isolation functions, the fast reconfiguration algorithm is developed to maintain the power balance of the remainder power system after a severe fault with the aim of reducing the impact of fault to the minimum.
30 citations
12 Jun 2005
TL;DR: This paper discusses integration of two existing automated analysis applications, DFR data analysis and digital relay data analysis, to achieve comprehensive fault analysis and introduces digital relay files and reports.
Abstract: This paper discusses integration of two existing automated analysis applications, DFR data analysis and digital relay data analysis, to achieve comprehensive fault analysis. As inputs to the integrated application, digital relay files and reports are introduced. The proposed strategy and implementation of integration are outlined. An example is used to demonstrate features of the integrated application developed so far.
30 citations