Results 61 to 70 of about 44,267 (264)

Distributed control of a fault tolerant modular multilevel inverter for direct-drive wind turbine grid interfacing

, 2012
Modular generator and converter topologies are being pursued for large offshore wind turbines to achieve fault tolerance and high reliability. A centralized controller presents a single critical point of failure which has prevented a truly modular and ...
Finney, Stephen J., Parker, Max, Ran, Li, Finney, Stephen, Parker, Max A.   +4 more
core   +1 more source

Avoiding the non-detection zone of passive loss-of-mains (islanding) relays for synchronous generation by using low bandwidth control loops and controlled reactive power mismatches [PDF]

, 2014
Generation connected to electrical distribution systems requires reliable and timely detection of loss of-mains (islanding). Passive loss of mains detection relays typically use measurements of parameters such as frequency, phase, and the magnitudes of ...
Roscoe, Andrew, Burt, Graeme, Bright, C.G.   +2 more
core   +1 more source

Techniques and applications of inverter-based online grid impedance estimation

, 2021
The extensive integration of the distributed generation units is transforming the existing conventional synchronous generator-based power system from a passive to an active mode. While this new shift enables more integration of renewable energy resources,
Nabil Abduljalil Abdo Mohammed (13999094)
core   +1 more source

Phase Field Failure Modeling: Brittle‐Ductile Dual‐Phase Microstructures under Compressive Loading

Advanced Engineering Materials, EarlyView.
The approach by Amor and the approach by Miehe and Zhang for asymmetric damage behavior in the phase field method for fracture are compared regarding their fitness for microcrack‐based failure modeling. The comparison is performed for the case of a dual‐phase microstructure with a brittle and a ductile constituent.
Jakob Huber, Jan Torgersen, Ewald Werner
wiley   +1 more source

A Partial Impedance Decoupling Control Method for PMSG-Based Wind Farms Connected to a Weak Grid

Applied Sciences
Under weak grid conditions, the coupling between the grid-connected converter and the grid impedance tends to bring in harmonic instability in the permanent-magnet synchronous generators (PMSGs)-based wind farm system.
Zixiao Lin, Luona Xu, Niancheng Zhou, Peng Huang, Chaoqing Zhang   +4 more
doaj   +1 more source

The Grounding Impedance Characteristics of Grid Configuration

, 2013
The role of grounding systems in the electrical power systems is very importance especially for safety the personal who operate and maintenance the electrical power systems, the data, instrumentation and equipment of the electrical power systems, if this
Anggoro, B., R.E. Yutadhia, Yutadhia, R.E., B. Anggoro   +3 more
core   +1 more source

Understanding the Stochastic Nature of Process Parameter Development of Blown Powder Laser Beam Directed Energy Deposition Additive Manufacturing of Pure Molybdenum

Advanced Engineering Materials, EarlyView.
Identified through the use of statistical design of experiments and metallographic investigation, this study exposes the stochastic origins of intergranular cracks in blown powder laser beam directed energy deposition additive manufacturing of pure molybdenum. It further demonstrates a successful crack mitigation approach with direct correlation to the
Nathaniel J. Lies, Daniel E. Driemeyer, Aaron P. Stebner   +2 more
wiley   +1 more source

Magnitude-Reshaping Strategy for Harmonic Suppression of VSG-Based Inverter Under Weak Grid

IEEE Access, 2020
Driven by inertial demand from the grid, the virtual synchronous generators (VSGs) are widely utilized in distributed generation systems. However, harmonic sources in the distributed generation systems with high grid impedance will cause grid voltage ...
Wen Yang, Mingyu Wang, Saddam Aziz, Ali Yousaf Kharal   +3 more
doaj   +1 more source

Slip Localization Intensification Mediated by Grain Boundary Sliding in a Polycrystalline Nickel‐Based Superalloy

Advanced Engineering Materials, EarlyView.
The temperature dependence of fatigue behavior in nickel‐based superalloys is investigated through high‐resolution measurements of plastic localization. While increasing temperature reduces localization and enhances fatigue performance in René 88DT, Inconel 718 exhibits a sharp degradation at intermediate temperature due to intensified slip ...
M. Calvat, D. Anjaria, I. Woo, C. Bean, D. Texier, J. C. Stinville   +5 more
wiley   +1 more source

Estratégia híbrida de controle para inversores trifásicos conectados à rede baseada em controladores deadbeat e proporcional+ressonante [PDF]

, 2014
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2014.Neste trabalho apresentam-se metodologias de projeto de controladores de corrente para inversores ...
Andreta, André Gutierrez
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