Results 41 to 50 of about 20,095 (267)

Wide frequency range active damping of LCL-filtered grid-connected converters

The Journal of Engineering, 2019
It can be challenging to guarantee the stability of grids with many converters with LCL filters connected due to the presence of multiple resonances within the system. This paper presents an active damping technique to mitigate multiple resonance effects
Abdelhady Ghanem, Mohamed Rashed, Mohamed Rashed, Mark Sumner, Mohamed Adel El-sayes, Ibrahim. I. I. Mansy   +5 more
doaj   +1 more source

Semi-Active Cable Damping to Compensate for Damping Losses Due to Reduced Cable Motion Close to Cable Anchor

Applied Sciences, 2022
The relative motion of transverse cable dampers is smaller than predicted by the taut string model because of the effects of bending stiffness and fixed support conditions.
Felix Weber, Simon Spensberger, Florian Obholzer, Johann Distl, Christian Braun   +4 more
doaj   +1 more source

3D‐Printed Serial Snap‐Through Architectures for Programmable Mechanical Response

Advanced Engineering Materials, EarlyView.
A serial snap‐through architecture is realized using compact 3D‐printed von Mises truss units arranged in a staged cascade. Their geometry and boundary conditions program multistage mechanical responses with plateaux and re‐hardening regimes. An inverted‐compliance model predicts these behaviors and enables analytical design of programmable force ...
Filipe A. Santos
wiley   +1 more source

Direct active damping control for grid‐connected AC/DC converter with LCL filter using augmented look‐up table

IET Power Electronics, 2021
This paper presents a novel approach to adapt the conventional direct power control (DPC) methods that are applied to ac/dc converters with an inductive capacitive inductive (LCL) filter.
Chuanjin Zhang, Yutan Li, Chenxi Jia, Hong Fu, Xiao Zhang, Hui Zhang   +5 more
doaj   +1 more source

Intermolecular Interactions as Driving Force of Increasing Multiphoton Absorption in a Perylene Diimide‐Based Coordination Polymer

Advanced Functional Materials, EarlyView.
This study uncovers the unexplored role of intermolecular interactions in multiphoton absorption in coordination polymers. By analyzing [Zn2tpda(DMA)2(DMF)0.3], it shows how the electronic coupling of the chromophores and confinement in the MOF enhance two‐and three‐photon absorption.
Simon Nicolas Deger, Anna Mauri, Yang Cui, Sebastian Josef Weishäupl, Ali Deniz Özdemir, Hamad Syed, Aleksandr Ovsianikov, Wolfgang Wenzel, Alexander Pöthig, Jürgen Hauer, Mariana Kozlowska, Roland Augustinus Fischer   +11 more
wiley   +1 more source

A weighted damping strategy for improving the adaptability of converter to weak grid

Diance yu yibiao
Active damping can significantly improve the adaptability of converter to weak grid, however, when the PCC (point of common coupling) voltage harmonics are used for active damping control, the suppression ability of the system on the background harmonic ...
XU Jia, YANG Shude, ZHANG Xinwen
doaj   +1 more source

Understanding and Optimizing Li Substitution in P2‐Type Sodium Layered Oxides for Sodium‐Ion Batteries

Advanced Functional Materials, EarlyView.
This work explores Li‐substituted P2 layered oxides for Na‐ion batteries by crystallographic and electrochemical studies. The effect of lithium on superstructure orderings, on phase transitions during synthesis and electrochemical cycling and on the interplay of O‐ versus TM‐redox is revealed via various advanced techniques, including semi‐simultaneous 
Mingfeng Xu, Giovanni Gammaitoni, Michael Häfner, Eduardo Villalobos‐Portillo, Carlo Marini, Matteo Bianchini   +5 more
wiley   +1 more source

Semi-Active Damping of Mechanical Vibrating Systems Using Variable Stiffness Actuator

Al-Khawarizmi Engineering Journal, 2018
In this research, a variable stiffness actuator is proposed to enhance the damping of the mechanical vibrating system. The frequency response analysis of the vibrating system is dependant in order to analyze and synthesis this semi-active damping, where ...
Yarub Omer Naji Al-Azzawi
doaj  

Damping characteristic analysis of grid-forming PMSG-based WT under different power oscillation damping controls

International Journal of Electrical Power & Energy Systems
In this paper, the damping characteristics of the grid-forming permanent magnet synchronous generator (PMSG)-based wind turbine (WT) under different damping controls are investigated considering energy efficiency.
Xiaotian Yuan, Zhengchun Du, Yujun Li, Tong Qu, Han Jiang   +4 more
doaj   +1 more source

Passivity Based Damping Design for Grid-Connected Converter With Improved Stability

IEEE Access, 2019
The impedance interactions between weak grid and LCL-filtered converter can bring severe harmonic resonance. Recently, frequency domain passivity theory has been applied to converter damping design.
Huaiyuan Liu, Lei Li, Yuchao Liu, Dianguo Xu, Qiang Gao   +4 more
doaj   +1 more source