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.
Papers published on a yearly basis
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TL;DR: In this paper, three studies have examined the operational and planning problems associated with connecting small power sources to an electric distribution system and provided recommendations for accommodating this new technology, and identified areas needing further research.
Abstract: Three studies have examined the operational and planning problems associated with connecting small power sources to an electric distribution system. In one study [ 6], the harmonic distortion produced by a subdivision of PV arrays connected through line-commutated inverters was simulated. A second study [1,2,3] exami ned the protection and safety problems associated with the operation of small ac generators and dc-to-ac inverters. A third study [11] assessed the the effects of dispersed sources on distribution planning and design. The purpose of the studies was to determine the adequacy of the electric utility industryl traditional practices, hardware, and design for the operation of dispersed power sources on electric distribution systems. The purpose of this paper is to summarize the important results of these studies and related studies, give recommendations for accommodating this new technology, and identify areas needing further research.
35 citations
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26 Dec 2007TL;DR: An overview of traditional scheme requirements leading to the SIPS of the future is presented and a new survey is described, which should provide valuable information about power industry trends and experiences in SIPS.
Abstract: This paper describes some of the critical engineering, design, and applications of latest technology for system integrity protection schemes (SIPS). Applicability of the advanced analytical techniques for various types of SIPS applications on the basis of modern technology is also addressed as part of the overview. An overview is presented of traditional scheme requirements leading to the SIPS of the future. A new survey is described in the paper, which should provide valuable information about power industry trends and experiences in SIPS. Keywords: Power system protection, emergency control, industry practice.
35 citations
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TL;DR: Conventional overcurrent protection using negative and zero sequence current is proposed to increase the protection reliability and maintain coordination in the presence of distributed generators.
35 citations
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TL;DR: An algorithmic model is formulated that describes the impact of the operation of the power grid on the control network and an efficient cascade control algorithm using load shedding with consideration of delays in the communication network for power grids is proposed.
Abstract: The most severe failures in power grids are often characterized as cascading failures where an initial event triggers consequent failures all along the grid often leading to blackouts. Upon identifying a failure and its cascade potential, timely control actions should be performed by the grid operators to mitigate the effect of the cascade. These actions have to be delivered to one or more control devices, creating a dependency between the power grid and its control network. This paper examines the dependency of the operation of the power grid on the control network. Different from literature studies on failure control, our dependency model captures the impact of networking parameters. We formulate an algorithmic model that describes the impact of this dependency on cascade control. Based on this model, we propose an efficient cascade control algorithm using load shedding with consideration of delays in the communication network for power grids. Finally, we evaluate the impact of the power-communication network dependency with uncontrolled grids, ideal/simple control grids and our proposed control scheme. The results demonstrate that the proposed algorithm can significantly reduce the failure of power lines while sustaining larger power demand for users.
35 citations
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TL;DR: In this article, the authors analyzed the factors that may lead to the maloperation of transformer differential protection and concluded that local transient saturation of the current transformer (CT) caused by the decaying dc component in the magnetizing inrush is the main cause of the maloperation of the transformers.
Abstract: In substations with an inner bridge connection, the two main transformers are generally connected in parallel. The differential protection of the transformer, under normal operating conditions, may maloperate when the other transformer is switching on through the bridge breaker after scheduled maintenance. This paper analyzes the factors that may lead to the maloperation of transformer differential protection and concludes that local transient saturation of the current transformer (CT) caused by the decaying dc component in the magnetizing inrush is the main cause of the maloperation of the transformer differential protection. By detecting the time difference between the instant of sudden changes occurring in the transformer wye-side current and the instant of the differential current increasing, a new algorithm based on the time differential method is proposed in this paper, which can prevent the maloperation of transformer differential protection in substations with an inner bridge connection. On the basis of detailed analysis and simulation work, the new algorithm is verified to be applicable under the conditions of sympathetic inrush and CT saturation.
35 citations