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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TL;DR: In this paper, a dynamic state estimation based protection (EBP) method is proposed to address the challenges of series compensated transmission lines, which requires GPS synchronized measurements at both ends of the line and a high-fidelity model of the protection zone.
Abstract: Series compensated transmission lines challenge legacy protection schemes. In this paper, a dynamic state estimation based protection (EBP) method is proposed to address these challenges. The method requires GPS synchronized measurements at both ends of the line and a high-fidelity model of the protection zone. The paper presents the dynamic model of the protection zone and its impact on the performance of the protection scheme. Numerical simulations show that the method can correctly identify faults, independently of position and type. The paper also compares the proposed method versus legacy protection functions such as distance protection and line differential protection. The comparison shows faster detection of internal faults, immunity to current inversion caused by series capacitors (SCs) and improved detection sensitivity for high-impedance faults.
61 citations
TL;DR: In this paper, the first step in automatic supervision, condition monitoring and fault detection of photovoltaic system is recognition, exploration and classification of all possible faults that maybe happen in the system.
Abstract: The first step in automatic supervision, condition monitoring and fault detection of photovoltaic system is recognition, exploration and classification of all possible faults that maybe happen in the system. This paper aims to perceive, classified, simulate and discus all electrical faults in DC side of photovoltaic system, regarding electrical voltage and current inspections. For that, simplified hybrid model of photovoltaic panel in MATLAB environment is used. Investigation and classification of each type of faults is down and the effects of the faults are illustrated in this paper. Flash test are applied to improved electrical model. Current-Voltage curves signature are interpreted and investigated in simulation environment.
60 citations
TL;DR: This paper proposes identifying a vicious fault by using context information, such as voltage and current, of the same substation, when the protection system detects a fault based on measurements transmitted through a network and feeds these data to a probabilistic neural network.
Abstract: With the development of a substation automation system, it is now feasible for the intelligent electronic devices-based protection system to collect its measurements from electronic instrument transformers through a communication network such as an Ethernet-based local-area network. The application of a wide-area broadband network in power utilities introduces underlying danger for protection systems to maloperate when receiving fake data packages from an intruder. This paper proposes identifying a vicious fault by using context information, such as voltage and current, of the same substation. When the protection system detects a fault based on measurements transmitted through a network, it collects all measurements of the substation and feeds these data to a probabilistic neural network. Thereafter, the fault caused by fake data that differs from the known fault pattern can be identified and blocked.
60 citations
TL;DR: In this paper, a new algorithm based on processing differential current harmonics is proposed for digital differential protection of power transformers by considering different behaviors of second harmonic components of the differential currents under fault and inrush current conditions.
60 citations
13 Jul 2003
TL;DR: In this article, the coordination requirements for intention islanding to increase DG/Utility reliability in providing uninterruptible power to the connected loads are investigated, and the most principal interconnection switchgear components are identified for the islanding.
Abstract: The paper investigates the coordination requirements for intention islanding to increase DG/Utility reliability in providing uninterruptible power to the connected loads. The most principal interconnection switchgear components are identified for the islanding. The argument of the intention islanding case is carried out using a hypothetical DG/Utility model. By identifying the principal switchgear, proper interfacing using programmable logic controllers are recommended to bridge the communication gap between the DG/Utility and the protection switchgear. Through the identified interface requirements and permitting DG islanding in the case of main feeder faults, greater reliability and load power continuity was achieved.
60 citations