Results 51 to 60 of about 2,208,266 (201)

Improving Microgrid Frequency Regulation Based on the Virtual Inertia Concept while Considering Communication System Delay

Energies, 2019
Frequency stability is an important issue for the operation of islanded microgrids. Since the upstream grid does not support the islanded microgrids, the power control and frequency regulation encounter serious problems.
Gholam Ali Alizadeh, Tohid Rahimi, Mohsen Hasan Babayi Nozadian, Sanjeevikumar Padmanaban, Zbigniew Leonowicz   +4 more
doaj   +1 more source

Joint Timekeeping of Navigation Satellite Constellation with Inter-Satellite Links

Sensors, 2020
As a system of ranging and positioning based on time transfer, the timekeeping ability of a navigation satellite constellation is a key factor for accurate positioning and timing services. As the timekeeping performances depend on the frequency stability
Leyuan Sun, Wende Huang, Shuaihe Gao, Wei Li, Xiye Guo, Jun Yang   +5 more
doaj   +1 more source

Comparative Analysis of Current Control Techniques to Support Virtual Inertia Applications

Applied Sciences, 2018
The rapid transition towards an inverter-dominated power system has reduced the inertial response capability of modern power systems. As a solution, inverters are equipped with control strategies, which can emulate inertia by exchanging power with the ...
Ujjwol Tamrakar, Dipesh Shrestha, Naresh Malla, Zhen Ni, Timothy M. Hansen, Indraman Tamrakar, Reinaldo Tonkoski   +6 more
doaj   +1 more source

Atomic frequency standards for ultra-high-frequency stability [PDF]

The general features of the Hg-199(+) trapped-ion frequency standard are outlined and compared to other atomic frequency standards, especially the hydrogen maser.
Dick, G. J., Maleki, L., Prestage, J. D.
core   +1 more source

Analysis of the Phase Noise for Frequency Controlled Cryogenic Sapphire Oscillators

IEEE Access
Cryogenic sapphire oscillators (CSO) typically require frequency stabilization and noise reduction servos to achieve ultra-high frequency stability and ultra-low phase noise.
Encai Zhong, J.-M. Le Floch, Hongli Liu, Ke Deng, Jie Zhang, Zehuang Lu   +5 more
doaj   +1 more source

DSS 13 frequency stability tests [PDF]

In a previous article, the results of frequency stability tests at DSS 13 were presented in table form for tau = 1000 s for the test period May 1985 through March 1986. This article is a continuation of that initial report and presents specially selected
Franco, M. M., Otoshi, T. Y.
core   +1 more source

Performance of a 12-GHz fiber-optic system for beam-waveguide antenna stability testing [PDF]

, 1992
A 12-GHz fiber-optic system is a critical part of a test configuration that was proposed for measuring the fractional frequency stability of the Deep Space Station (DSS)-13 beam-waveguide (BWG) antenna.
Franco, M. M., Lutes, G. F., Otoshi, T. Y.   +2 more
core   +1 more source

Third-order chromatic dispersion stabilizes Kerr frequency combs

, 2014
Using numerical simulations of an extended Lugiato-Lefever equation, we analyze the stability and nonlinear dynamics of Kerr frequency combs generated in microresonators and fiber resonators taking into account third-order dispersion effects.
Coen, Stephane, Gelens, Lendert, Gomila, Damia, Leo, Francois, Parra-Rivas, Pedro   +4 more
core   +1 more source

Frequency Stability Control Strategy for Voltage Source Converter-Based Multi-Terminal DC Transmission System

Energies
The voltage source converter-based multi-terminal DC transmission (VSC-MTDC) system can use additional frequency control to respond to the frequency change of faulty AC system.
Chao Xing, Mingqun Liu, Junzhen Peng, Yuhong Wang, Chengbo Shang, Zongsheng Zheng, Jianquan Liao, Shilin Gao   +7 more
doaj   +1 more source

A metaheuristic algorithm for regulating virtual inertia of a standalone microgrid incorporating electric vehicles

The Journal of Engineering
Modern electrical networks, particularly microgrids, have seen a sharp rise in acquiring non‐conventional sources. The inertia of the microgrid decreases drastically because RESs have been used in place of traditional synchronous generators.
Debayani Mishra, Manoj Kumar Maharana, Manoj Kumar Kar, Anurekha Nayak, Md. Minarul Islam, Taha Selim Ustun   +5 more
doaj   +1 more source