Results 31 to 40 of about 14,764,212 (352)

Frequency criteria for exponential stability

IMA Journal of Mathematical Control and Information, 2022
Abstract We discuss some frequency-domain criteria for the exponential stability of nonlinear feedback systems based on Popov’s hyperstability theorem. The main results are new bounds on convergence rates for perturbations of the damped harmonic oscillator, including the Hessian-damped case, when the perturbations satisfy certain ...
openaire   +3 more sources

Design consideration for frequency containment reserve provisions by a multi‐terminal HVDC system

IET Generation, Transmission & Distribution, 2023
Frequency control is considered to be an important function of multi‐terminal HVDC (MTDC) systems. Sharing frequency containment reserves (FCRs) among interconnected AC systems using HVDC technology is particularly attractive in the European context ...
Kosei Shinoda, Jing Dai, Gianni Bakhos, Juan Carlos Gonzalez‐Torres, Abdelkrim Benchaib, Seddik Bacha   +5 more
doaj   +1 more source

Frequency dynamics during high CCGT and wind penetrations [PDF]

, 2011
Presented at AUPEC 2011, Australasian Universities Power Engineering Conference, Brisbane, Australia, 25 - 28 September 2011Frequency stability is the paramount concern for secure and reliable operation of a power system. High wind penetration levels are
Flynn, Damian, Meegahapola, Lasantha
core   +1 more source

Current limitations of cryogenic microwave oscillator frequency stability

, 2014
Technical paperCryogenic microwave oscillators built upon sapphire loaded cavity resonators exhibit excellent levels of frequency stability. Here we present an overview of the current understanding of the various processes and noise sources that limit ...
Parker, S., John G. Hartnett, Stephen R. Parker, Ivanov, E., Tobar, M., Michael E. Tobar, Hartnett, J., Eugene N. Ivanov   +7 more
core   +1 more source

An Artificial Intelligence Frequency Regulation Strategy for Renewable Energy Grids Based on Hybrid Energy Storage

Energies
To address the frequency regulation requirements of hybrid energy storage (HES) in renewable-dominated power grids, this paper proposes an asymmetric droop control strategy based on an improved backpropagation (BP) neural network.
Qiang Zhang, Qi Jia, Tingqi Zhang, Hui Zeng, Chao Wang, Wansong Liu, Hanlin Li, Yihui Song   +7 more
doaj   +1 more source

Decentralized Adaptive Under Frequency Load Shedding Scheme Based on Load Information

IEEE Access, 2019
The inertia of the power system changes when the generators in the system are disturbed or tripped. However, in some systems, there is no control center or communication device falling behind.
Peican He, Buying Wen, Huaiyuan Wang
doaj   +1 more source

A Comparative Analysis of Prominent Virtual Synchronous Generator Strategies Under Different Network Conditions

IEEE Open Access Journal of Power and Energy
The virtual synchronous generator (VSG) is the most widely used grid-forming inverter (GFMI) control technique. The VSG can provide enhanced ancillary services and improved dynamic response compared to conventional synchronous generators and grid ...
Chalitha Liyanage, Inam Nutkani, Lasantha Meegahapola   +2 more
doaj   +1 more source

An overview of the optically detected magnetic-state-selected cesium beam clock

Frontiers in Physics, 2022
Among all kinds of compact cesium beam clocks, the optically detected magnetic-state-selected cesium beam clock (OMCC) combines the advantages of the magnetic state selecting scheme and fluorescence detecting method.
Sifei Chen, Chang Liu, Lifeng Fan, Chen Liu, Yuanhao Li, Shaohang Xu, Chaojie Li, Yanhui Wang   +7 more
doaj   +1 more source

Realization of Robust Frequency Stability in Low-Inertia Islanded Microgrids With Optimized Virtual Inertia Control

IEEE Access
The increase in renewable energy resources penetration into microgrids weakens the inertia of microgrids and negatively affects their frequency stability.
Walid M. Hamanah, M. Shafiullah, L. Alhems, Md. Shafiul Alam, M. Abido   +4 more
semanticscholar   +1 more source

An Online Estimation Method for the Equivalent Inertia Time Constant of Power Equipment Based on Node Power Flow Equations

Energies
As renewable energy integration scales up, power systems increasingly depend on sources interfaced through power electronic converters, which lack rotating mass and substantially diminish system inertia.
Zhenghui Zhao, Xianan Wang, Jinhui Sun, Yubo Sun, Qian Zhang, Yang Wang   +5 more
doaj   +1 more source