scholarly journals Determination of Controllers Constraints for Frequency Stability in an Islanded Microgrid

2012 ◽  
pp. 822-825
Author(s):  
M. Kohansal ◽  
G.B. Gharehpetian ◽  
M. Abedi ◽  
M.J. Sanjari
Keyword(s):  
Frequency Stability ◽  
Islanded Microgrid

scholarly journals Frequency and temperature control for complex system engineering in optoelectronics and electronics: an overview

2020 ◽  
Vol 11 ◽  
pp. 7 ◽  
Author(s):  
Patrice Salzenstein
Keyword(s):  
Complex System ◽  
Temperature Control ◽  
Frequency Stability ◽  
Optical Components ◽  
Optical Signals ◽  
Microwave Oscillators ◽  
Measurement Results ◽  
Physical Principles ◽  
Control Complex

To take advantage of the physical principles of determining parameters, such as frequency stability, noise and also alignment of optical signals, it is necessary to control complex systems. This work allows explaining it through various concrete cases such as the determination of phase noise of microwave oscillators, the control of the temperature of the manufacturing process of optical components. We also discuss the estimation of the uncertainty associated with the measurement results, as it is fundamental to control the error range.

Determination of an hydraulic motor's minimum rotation-frequency stability

1978 ◽  
Vol 21 (12) ◽  
pp. 1675-1677
Author(s):  
V. M. Petukhov ◽  
F. G. Pruglov
Keyword(s):  
Rotation Frequency ◽  
Frequency Stability

Digital coordination strategy of protection and frequency stability for an islanded microgrid

2018 ◽  
Vol 12 (15) ◽  
pp. 3637-3646 ◽  
Author(s):  
Emad A. Mohamed ◽  
Gaber Magdy ◽  
Gaber Shabib ◽  
Adel A. Elbaset ◽  
Yasunori Mitani
Keyword(s):  
Frequency Stability ◽  
Coordination Strategy ◽  
Islanded Microgrid

scholarly journals Power Prioritization and Load Shedding in an Island with RESs Using ABC Algorithm

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
L. O. Mogaka ◽  
G. N. Nyakoe ◽  
M. J. Saulo
Keyword(s):  
Renewable Energy Sources ◽  
Accurate Determination ◽  
Load Shedding ◽  
Steady Increase ◽  
Power Demand ◽  
Power Utility ◽  
Abc Algorithm ◽  
Optimum Load ◽  
Islanded Microgrid

The main aim of a power utility company is to supply quality and uninterrupted power to customers. This becomes a growing challenge as the continued increase in population calls for proportional increase in power supply to additional loads. If not well planned, this steady increase in power demand can lead to voltage collapse and eventual power blackouts. In instances where power demand exceeds generation within islanded microgrid or due to an occurrence of a contingency, optimum load shedding should be put in place so as to enhance system security and stability of the power system. Load shedding is traditionally done based on undervoltage measurements or underfrequency measurements of a given section of the grid. However, when compared with conventional methods, metaheuristic algorithms perform better in accurate determination of optimal amount of load to be shed during a contingency or undersupply situations. In this study, an islanded microgrid with high penetration of Renewable Energy Sources (RESs) is analyzed, and then Artificial Bee Colony (ABC) algorithm is applied for optimal load shedding. The results are then compared with those of Genetic Algorithm (GA), Particle Swarm Optimization (PSO), and GA-PSO hybrid. Both generation and overload contingencies are considered on a standard IEEE 30-bus system on a MATLAB platform. Different buses are assigned priority indices which forms the basis of the determination of which loads and what amount of load to shed at any particular time.

DISTANCE MEASUREMENTS USING FREQUENCY STABILIZED Nd:YAG LASERS

1996 ◽  
Vol 05 (03) ◽  
pp. 543-550
Author(s):  
VERED MAHAL ◽  
ADY ARIE
Keyword(s):  
Frequency Stability ◽  
Precise Determination ◽  
Phase Shifting ◽  
Distance Measurements ◽  
Fringe Contrast ◽  
Nd:Yag Lasers ◽  
Wide Range ◽  
Diode Pumped ◽  
Selection Of

Two diode-pumped tunable Nd:YAG lasers locked to sub-Doppler transitions of 127I2 and 133 Cs 2 are used as a source for two-wavelength interferometry. The synthetic wavelength, Λ=c/∆ν, is highly stable and accurate, owing to the frequency stability of the locked lasers and the precise determination of the frequency difference Δν between Cs 2 and I 2 transitions. The dense spectra of these molecules allows selection of Λ over a wide range, between 8.5 mm and several meters, thus enabling distance measurements with a large non-ambiguity range. Fringe contrast and phase-shifting methods are used to measure the phase difference. An accuracy of 70 μm is achieved for Λ~19 mm, i.e. Λ/260.

Retracted: Robust virtual inertia control to support frequency stability of an islanded microgrid

2018 ◽  
Vol 12 (7) ◽  
pp. 874-874 ◽  
Author(s):  
Thongchart Kerdphol ◽  
Fathin Saifur Rahman ◽  
Yasunori Mitani ◽  
Masayuki Watanabe ◽  
Komsan Hongesombut
Keyword(s):  
Frequency Stability ◽  
Islanded Microgrid ◽  
Virtual Inertia ◽  
Inertia Control
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