Results 1 to 10 of about 178,050 (230)
Effective impedance modeling of metamaterial structures [PDF]
Journal of the Optical Society of America A, 2016 We present methods for retrieving the effective impedance of metamaterials from the Fresnel reflection coefficients at the interface between two semi-infinite media. The derivation involves the projection of rigorous modal expansions onto the dominant modes of the two semi-infinite media.
Kokou B, Dossou +2 more
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IEEE Open Journal of Power ElectronicsThe extensive integration of voltage-source converters (VSCs) as interfaces for renewable energy sources in power systems increases stability concerns and demands accurate VSC impedance models to characterize grid-converter interactions at various ...
Moetasem Ali +1 more
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Modelling Turbine Acoustic Impedance [PDF]
International Journal of Turbomachinery, Propulsion and Power, 2021 We quantify the sensitivity of turbine acoustic impedance to aerodynamic design parameters. Impedance boundary conditions are an influential yet uncertain parameter in predicting the thermoacoustic stability of gas turbine combustors. We extend the semi-actuator disk model to cambered blades, using non-linear time-domain computations of turbine vane ...
Brind, James, Pullan, Graham
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IEEE Access, 2022 The point-of-load (POL) converters integrated with the input LC filter are essential to supply the ac load in the dc microgrid. The interaction between the LC filter and the POL converter will bring instability problems to the dc-link voltage. This paper
Huanyue Liao, Xin Zhang, Hao Ma
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Model Predictive Impedance Control [PDF]
2020 IEEE International Conference on Robotics and Automation (ICRA), 2020 Robots are more and more often designed in order to perform tasks in synergy with human operators. In this context, a current research focus for collaborative robotics lies in the design of high-performance control solutions, which ensure security in spite of unmodeled external forces.
Maciej Bednarczyk +2 more
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Frequency-Domain Stability Criteria for Converter-Based Power Systems
IEEE Open Journal of Power Electronics, 2022 Frequency-domain stability criteria are developed for converter-based power systems with any number of converters. The converters may be grid following or grid forming, and the grid can be an ac or hybrid ac-dc network. The converters and the network are
Jian Sun
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DC Admittance Model of VSCs for Stability Studies in VSC-HVDC Systems
Energies, 2023 High-voltage direct current (HVDC) systems linked to AC grids with converters are promising energy transmission systems. These systems present complex AC- and DC-side dynamic interactions.
Joaquín Pedra, Luis Sainz, Lluís Monjo
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Adaptive Oscillation Suppression Strategy for Wind Farms Based on Windowed FFT
Zhongguo dianli, 2022 Regarding the oscillation phenomenon in large-scale wind power transmission systems, the existing suppression strategies can hardly quickly and effectively suppress the oscillation when the oscillation frequency changes. To solve this problem, this paper
Shuo MIAO +5 more
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Impedance-Based Modeling and Common Bus Stability Enhancement Control Algorithm in DC Microgrid
IEEE Access, 2020 In this paper, impedance modeling of a DC microgrid system consisting of a source and load converter, including an input filter, is performed. Impedance-based modeling has been used to derive mathematical models of the output impedance of the source ...
Jae-Suk Lee +3 more
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Energies, 2022 With the continuous penetration and development of renewable energy power generation, distributed grids and microgrids are becoming increasingly important in power systems.
Guoli Feng +4 more
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