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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10 Sep 2000
TL;DR: In this paper, alternative design approaches for powering modern telecommunications facilities having both AC-and DC-powered equipment, including the use of a DC plant with inverters for the AC loads, a DC power plant for the DC loads and AC UPS for AC loads with rectifiers for DC loads, were discussed.
Abstract: This paper describes alternative design approaches for powering modern telecommunications facilities having both AC- and DC-powered equipment, including the use of a DC plant with inverters for the AC loads, a DC plant for the DC loads and AC UPS for the AC loads, and an AC UPS for the AC loads with rectifiers for the DC loads. The use of standby generators in lieu of long battery backup times is also discussed. Advantages and disadvantages of the various design approaches are presented along with some guidelines as to what circumstances favor one approach over another.
45 citations
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TL;DR: In this article, the authors discuss and analyze animal-caused faults in power distribution systems and present an animal fault prevention technique that can effectively reduce these faults, and the results of such a technique are presented.
Abstract: The reliability, security and quality of power systems are significantly affected by distribution faults. One of the trends concerning distribution faults is the implementation of more preventive measures instead of reactive measures. In other words, we would like to prevent faults from happening rather than to restore the system after faults occur. Among the different categories of power distribution faults, animal-caused faults are probably the ones that can be prevented most easily and effectively if appropriate control actions are taken. This paper discusses and analyzes animal-caused faults in power distribution systems. The results of an animal fault prevention technique that can effectively reduce these faults is also presented. >
45 citations
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15 Aug 2005TL;DR: The mechanism of cascading failure in power grid is explained, and from the point of view in artificial power system and complex network, several existing models are introduced and commented and some feasible methods are analyzed and discussed.
Abstract: Highly interconnected power grid is developing more and more complex. Cascading failure in such complex power grid, which can be triggered by some disturbances, will have global catastrophic effects over the entire networks. So the research on cascading failure of complex power grid is of significant concern. The foundation of such research is the modeling. In this paper, the mechanism of cascading failure in power grid is firstly explained. Then respectively from the point of view in artificial power system and complex network, several existing models are introduced and commented. And some feasible methods, which should be paid more attention to in the future, in order to prevent and control cascading failure are also analyzed and discussed
45 citations
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25 Jul 2010TL;DR: In this paper, a combined protection and control strategy was proposed to enhance the low voltage ride-through capability of a wind turbine driven doubly fed induction generator (DFIG), where the conventional crowbar was activated to protect the rotor side converter during the fault interval, the DFIG will operate in the fix speed mode and absorb large amount of reactive power from the grid.
Abstract: This paper proposes a combined protection and control strategy to enhance the low voltage ride-through (LVRT) capability of a wind turbine driven doubly fed induction generator (DFIG). Since the conventional crowbar is activated to protect the rotor side converter during the fault interval, the DFIG will operate in the fix speed mode and absorb large amount of reactive power from the grid. This problem can be improved by using a hysteresis control scheme for the crowbar protection to minimize its operation time. Furthermore, considering the voltage ripple in the DC link side under fault condition, a battery energy storage system (BESS) connected to the DC bus is controlled to attenuate the DC voltage ripple via absorbing the redundant power stored in the DC link capacitor. Simulation results show the effectiveness of this combined protection and control strategy.
45 citations
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TL;DR: In this paper, a fault classification method with faulted phase selection action for single-circuit transmission lines based on the symmetrical components of reactive power is presented. But the proposed method does not need any threshold to operate and it is thus a setting-free method which is an exceptional attribute for a protective function.
Abstract: This paper presents a fault classification method with faulted phase selection action for single-circuit transmission lines which is based on the symmetrical components of reactive power. The proposed method does not need any threshold to operate and it is thus a setting-free method which is an exceptional attribute for a protective function. The evaluation of different fault cases reveals the capability of the proposed method.
45 citations