Results 21 to 30 of about 762,597 (314)

Frequency stability and phase noise of an improved X-band cryocooled sapphire oscillator [PDF]

, 2010
A previously implemented cryogenic sapphire oscillator (CSO) based on a commercial cryocooler has been modified and its frequency stability and phase noise re-measured against a nominally similar liquid helium cooled CSO in the same laboratory.
John G. Hartnett, Nand, N.R., Hartnett, J.G., Nitin R. Nand   +3 more
core   +1 more source

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

Multivariable Repetitive-predictive Controllers using Frequency Decomposition [PDF]

, 2012
Repetitive control is a methodology for the tracking of a periodic reference signal. This paper develops a new approach to repetitive control systems design using receding horizon control with frequency decomposition of the reference signal.
Rogers, E, Chai, S, Wang, L, Freeman, C T, Shan Chai, Liuping Wang, Eric Rogers, Chris T. Freeman   +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

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

Fast frequency response for effective frequency control in power systems with low inertia

The Journal of Engineering, 2019
The increasing penetration of renewable generation has led to the decrease of power systems’ overall inertia, which introduces significant challenges to frequency stability.
Qiteng Hong, Marcel Nedd, Seán Norris, Ibrahim Abdulhadi, Mazaher Karimi, Vladimir Terzija, Benjamin Marshall, Keith Bell, Campbell Booth   +8 more
doaj   +1 more source

Unit commitment of power systems considering system inertia constraints and uncertainties

IET Renewable Power Generation
Large‐scale integration of renewable energy into the power grid results in a lack of system inertia, posing challenges to the optimal operation and scheduling of systems considering frequency stability.
Yuxin Weng, Guangchao Geng, Quanyuan Jiang   +2 more
doaj   +1 more source