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Controlling the energies of the single-rotor large wind turbine system using a new controller.
Sci Rep
January 2025
Department of Electrical Engineering, College of Engineering, King Khalid University, P.O. Box 394, Abha, 61421, KSA, Saudi Arabia.
In wind energy generation systems, ensuring high energy quality is critical but is often compromised due to the limited performance and durability of conventional regulators. To address this, this work presents a novel controller for managing the machine-side inverter of a single-rotor large wind turbine system using an induction machine-type generator. The proposed controller is designed using proportional, integral, and derivative error-based mechanisms, which fundamentally differ from traditional proportional-integral (PI) regulators.
View Article and Find Full Text PDFThe integration of large-scale power electronic equipment has intensified harmonic issues in power systems. Accurate harmonic models are fundamental for evaluating and mitigating harmonic problems, but existing models still exhibit deficiencies in harmonic mechanism, model complexity and accuracy. This work proposes a calculation method of crossed frequency admittance matrix (CFAM) analytical model based on piecewise linearization, aiming to achieve accurate modeling of phase-controlled power electronic harmonic sources.
View Article and Find Full Text PDFInfluence of Microstructure on Music Properties of SWP-B Music Steel Wire Under Different Annealing Treatments.
Materials (Basel)
January 2025
Joint R&D Center for Metallic Materials, Metallic Wire and Metallic Card Clothing, Xi'an 710021, China.
The mechanical properties of music wire are contingent upon its microstructure, which in turn influences its applications in music. Chinese stringed instruments necessitate exacting standards for comprehensive performance indexes, particularly with regard to the strength, resilience, and rigidity of the musical steel wires, which differ from the Western approach to musical wire. In this study, SWP-B music wire was selected for investigation through metal heat treatment, which was employed to regulate its microstructure characteristics.
View Article and Find Full Text PDFGate- and flux-tunable sin(2φ) Josephson element with planar-Ge junctions.
Nat Commun
January 2025
Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG-PHELIQS, 38000, Grenoble, France.
Hybrid superconductor-semiconductor Josephson field-effect transistors (JoFETs) function as Josephson junctions with gate-tunable critical current. Additionally, they can feature a non-sinusoidal current-phase relation (CPR) containing multiple harmonics of the superconducting phase difference, a so-far underutilized property. Here we exploit this multi-harmonicity to create a Josephson circuit element with an almost perfectly π-periodic CPR, indicative of a largely dominant charge-4e supercurrent transport.
View Article and Find Full Text PDFLOCAL CHARACTERIZATION OF COLLAGEN ARCHITECTURE AND MECHANICAL PROPERTIES OF TISSUE ENGINEERED ATHEROSCLEROTIC PLAQUE CAP ANALOGS.
Acta Biomater
January 2025
Department of Cardiology, Biomedical Engineering, Cardiovascular Institute, Thorax Center, Erasmus MC, Rotterdam, the Netherlands.
Many cardiovascular events are triggered by fibrous cap rupture of an atherosclerotic plaque in arteries. However, cap rupture, including the impact of the cap's structural components, is poorly understood. To obtain better mechanistic insights in a biologically and mechanically controlled environment, we previously developed a tissue-engineered fibrous cap model.
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