Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"ROCOF"”.
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Peak-ratio analysis method for enhancement of LOM protection using M class PMUs
… is based on a Rate of Change of Frequency (ROCOF) measurement from M-class PMUs, but the key novelty of the method lies in the fact that it employs a new 'peak-ratio' analysis of the measured ROCOF waveform during any frequency disturbance to determine whether the potentially-islanded …
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Multi-purpose applications of energy storage systems in a power system network
… incorporates the rate of change of frequency (RoCoF) for varying degrees of renewable energy penetration. This is extremely important because as the use of renewable energy resources grows, RoCoF values will increase, causing the frequency to fluctuate rapidly during significant grid …
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Reliability allocation and apportionment: addressing redundancy and life-cycle cost
… LCC, is used. The Rate of Occurrence of Failure (ROCOF) is the reliability metric used in both the allocation and the apportionment routines. The formulation of the LCC model carefully distinguishes between failures and an allied measurement, demands.
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New methods for the protection of embedded generators against the loss of utility networks.
… current methods of detecting LOM, particularly ROCOF and vector surge, would sometimes fail to operate correctly. From initial theoretical analysis and computer simulation it was found that these problems were increased when the EG was "islanded" with a load of similar capacity. To investigate …
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Smart management strategies of utility-scale energy storage systems in power networks
… as well as rate of change of frequency (ROCOF). Detailed simulation results suggest that ESS allocation using both uniform and non-uniform ESS sizing approaches is useful for improving distribution network performance as well as power quality. Regarding performance parameters, voltage …
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Algorithms for the synchrophasor measurement in steady-state and dynamic conditions
… frequency and Rate of Change of Frequency (ROCOF) are estimated using the higher derivatives outputs of the adaptive TFT. Frequency estimation feedback is used to tune the algorithm and achieve better performance in off-nominal conditions. The proposed approaches are validated by means of …
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Line and Generator Outage Identification using Synchrophasor Measurements
… are proposed utilizing (1) frequency and ROCOF measurements, pre-outage generations and inertia constants; (2) line flow measurements and linear sensitivity factors; and (3) voltage measurements, system admittance matrix, generator internal reactances and generator injections prior to the …
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Implementace postupů a vyhodnocení dat ze zkoušek souladu výrobních modulů kategorie A1 a A2
Úvodní část diplomové práce obsahuje základní poznatky problematiky výrobních modulů a popis jednotlivých kategorií podle nařízení komise EU 2016/631, které se připojují do elektrizační soustavy v ČR. V souvislosti s tímto rozřazením a se zadáním této práce, jsou dále popsány jednotlivá pravidla …