Results 31 to 40 of about 1,283,393 (314)

Word frequency effects in sound change as a consequence of perceptual asymmetries: An exemplar-based model [PDF]

open access: yes, 2019
Empirically-observed word frequency effects in regular sound change present a puzzle: how can high-frequency words change faster than low-frequency words in some cases, slower in other cases, and at the same rate in yet other cases?
Pierrehumbert, Janet B   +2 more
core   +1 more source

Controlling the Frequency Response in AC/DC Microgrid using an Energy Storage Device

open access: yesAl-Iraqia Journal for Scientific Engineering Research, 2022
This paper deals with the issue of frequency regulation in a small insulated low inertia grid with a large participation of renewable energy sources (RESs).
Athraa Hafed Mahdi , Wafaa Saeed Majeed
doaj   +1 more source

Rate of Conditioned Reinforcement Affects Observing Rate But Not Resistance to Change [PDF]

open access: yes, 2005
The effects of rate of conditioned reinforcement on the resistance to change of operant behavior have not been examined. In addition, the effects of rate of conditioned reinforcement on the rate of observing have not been adequately examined.
Shahan, Timothy A.   +1 more
core   +1 more source

Analysis of Wind Speed and Wind Pressure on the Facades in Frequency Domain for the Modelling of Air Change Rate [PDF]

open access: yes, 2020
Air exchange in buildings is driven by pressure difference across the building envelope caused by wind and difference in density between external and internal air.
Pietrzyk, Krystyna   +2 more
core   +1 more source

A grid-forming approach utilizing DC bus dynamics for low inertia power systems with HVDC applications

open access: yesHeliyon
While power electronic converters, such as voltage source converters (VSCs), are crucial for the operation of converter-dominated renewables and their integration with the electricity grid, their reliance on VSCs can pose a challenge. The limited inertia
Asif Khan   +4 more
doaj   +1 more source

Fast and adaptive under frequency load shedding and restoration technique using rate of change of frequency to prevent blackouts [PDF]

open access: yes, 2010
This paper explains a fast acting Under Frequency Load Shedding and restoration scheme. This load shedding technique has an added advantage of selecting the amount of load which is to be dropped at a particular frequency threshold.
Tapan Kumar Saha   +3 more
core   +1 more source

Quantitative Difference Between the Effective Inertia and Set Inertia Parameter of Virtual Synchronous Generators

open access: yesEnergies
Virtual synchronous generators (VSGs) have been developed to mitigate the increase in the rate of change of frequency (ROCOF) in power systems by replacing synchronous generators (SGs) with inverter-based resources. VSGs mimic the dynamics and control of
Ryosuke Shikuma   +5 more
doaj   +1 more source

Developing a synthetic inertia function for smart inverters and studying its interaction with other functions with CHIL testing

open access: yesEnergy Reports, 2023
Due to the increasing burden on the traditional control systems, inverter-based resources (IBR) is required to take part in grid stability efforts. This is the key to increasing the share of IBRs in the power grid and ensuring that issues related to ...
Jun Hashimoto   +12 more
doaj   +1 more source

A Three-Level Hybrid Islanding Detection Method for Inverter-Based DGs by Using ROCOV, ROCOF, and Voltage Phase Angle

open access: yesIEEE Open Access Journal of Power and Energy
This paper proposes a three-stage hybrid islanding detection method tailored for inverter-based distributed generation systems. In the first stage, the system passively monitors voltage deviations that may signal a power imbalance.
Farshad Aslani, Shuhui Li
doaj   +1 more source

Frequency following responses and rate change complexes in cochlear implant users

open access: yesHearing Research, 2021
The upper limit of rate-based pitch perception and rate discrimination can differ substantially across cochlear implant (CI) users. One potential reason for this difference is the presence of a biological limitation on temporal encoding in the electrically-stimulated auditory pathway, which can be inherent to the electrical stimulation itself and/or to
Gransier, Robin   +3 more
openaire   +4 more sources

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