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Start Over Topic power, energy and industry applications Topic law Publication Year Range Last 10 years
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1. Real-time remedial action against aperiodic small signal rotor angle instability

Author

Jacob Østergaard, Hjortur Johannsson, and Tilman Weckesser

Subjects
IEEE standards, Engineering, Power, Energy and Industry Applications, Electric generator, Boundary (topology), 02 engineering and technology, Remedial actions, Signal, law.invention, load dispatching, IEEE 14-bus test system, law, power system stability, 0202 electrical engineering, electronic engineering, information engineering, Rotors (windings), aperiodic small signal rotor angle instability, Control methods, Impedance, Components, Circuits, Devices and Systems, Steady-state, rotors, real-time remedial action, power system security, Aperiodic graph, stability boundary monitoring, Restoration, Stability boundaries, Stability, power system generation redispatch, Steady state (electronics), 020209 energy, Real-time operation, Energy Engineering and Power Technology, maximum steady state active power injection, Instability, Stability (probability), Rotor angle stability, active power redispatch, Control theory, Electrical and Electronic Engineering, Real-time systems, Stable operation, Impedance plane, business.industry, Stability analysis, AC power, Power system control, Electric generators, Generators, Characteristic curve, secure operation, Security, Nordic32 test system, business, remedial action schemes
Abstract

This paper presents a method that in real-time determines remedial actions, which restore stable operation with respect to aperiodic small signal rotor angle stability (ASSRAS) when insecure or unstable operation has been detected. An ASSRAS assessment method is used to monitor the stability boundary for each generator in real-time. The ASSRAS boundary represents the condition when a generator reaches the maximum steady state active power injection. The proposed control method exploits analytically derived expressions for the ASSRAS boundary and other characteristic curves in the injection impedance plane to determine an active power redispatch among selected generators to restore stable and secure operation. Since the method is purely based on analytically derived expression, the computation of the remedial actions is fast and well suited for real-time operation. The method was tested on the IEEE 14-bus and the Nordic32 test systems where results show that the method can efficiently determine the required active power redispatch to avoid an imminent instability.

Published
2016

2. Modeling, fabrication and high power optical characterization of plasmonic waveguides

Author

Oleg Lysenko and Andrei V. Lavrinenko

Subjects
optical characterization, film thickness, Power, Energy and Industry Applications, thin gold films, Optical fiber, metallic thin films, Nanophotonics, Physics::Optics, Optical device fabrication, optical fabrication, optical waveguides, AuSiO2(role ss), law.invention, law, optical losses, Polariton, nanostructured materials, Si(role sur), linear propagation, silicon dioxide, SiO2(role sur), surface plasmon polaritons, Surface plasmon, Components, Circuits, Devices and Systems, O2(role ss), Surface waves, Engineered Materials, Dielectrics and Plasmas, Wavelength, SiO2(role ss), effective index method, nanophotonics, Optoelectronics, silicon compounds, Fields, Waves and Electromagnetics, propagation losses, wavelength 7.5E-07 1.7E-06 m, polaritons, Materials science, Fabrication, Au(role ss), Au(role sur), Bioengineering, plasmonics, Optics, O(role sur), Optical fibers, quality inspection, Si(role ss), high-power laser, Plasmon, AuSiO2(role sur), coupling losses, business.industry, surface plasmons, plasmonic waveguides, gold, wavelength 750 nm to 1700 nm, Surface plasmon polariton, Optical surface waves, propagation vector, Signal Processing and Analysis, Au-SiO2, O(role ss), business, plasmons, O2(role sur)
Abstract

This paper describes modeling, fabrication and high power optical characterization of thin gold films embedded in silicon dioxide. The propagation vector of surface plasmon polaritons has been calculated by the effective index method for the wavelength range of 750-1700 nm and film thickness of 15, 30 and 45 nm. The fabrication process of such plasmonic waveguides with width in the range of 1-100 μm and their quality inspection are described. The results of optical characterization of plasmonic waveguides using a high power laser with the peak power wavelength 1064 nm show significant deviation from the linear propagation regime of surface plasmon polaritons at the average input power of 100 mW and above. Possible reasons for this deviation are heating of the waveguides and subsequent changes in the coupling and propagation losses.

Published
2015