Results 21 to 30 of about 1,626,501 (307)

A novel AC chopper integrated with active measurement of wideband impedance for wind power system

IET Power Electronics, 2023
Large‐scale wind farms are susceptible to oscillations like any other power systems with high penetration of power electronics, whose characteristics of wideband impedance hold the key to resolving this issue.
Yan Shi, Lei Qi, Xiangyu Zhang, Liangtao Zhan, Xiang Cui   +4 more
doaj   +1 more source

Modelling and simulation analysis of MMC‐HVDC system based on transient energy flow

IET Renewable Power Generation, 2023
In the high voltage direct current (HVDC) transmission system composed of modular multilevel converters (MMC), considering the distribution of transient energy flow (TEF) contributes to the transient modelling and fault characteristic analysis when dc ...
Jun Yan, Lixu Chen, Jianzhong Xu, Chengyong Zhao, Xiufang Jia   +4 more
doaj   +1 more source

Investigation on sub-synchronous oscillations in DFIG-based transmission system based on improved complex torque coefficients method

The Journal of Engineering, 2019
The complex torque coefficients (CTC) method has been widely adopted to investigate the conventional sub-synchronous oscillation (SSO) issues. However, the application of the CTC method is limited when large-scale wind power generations are integrated ...
Yijun Wang, Wenjuan Du, Chen Chen, Zijing Zhen, Haifeng Wang   +4 more
doaj   +1 more source

Emergency braking for free piston energy converters [PDF]

, 2005
Free piston energy converters are a potential technology for future hybrid vehicles, as well as stationary power generation applications. A candidate 2-stroke system comprises of two opposing combustion chambers with a common piston rod, and integrated ...
Bingham, Chris, Howe, D, Long, S, Wang, J, West, M   +4 more
core   +1 more source

Enhanced thermal and mechanical properties by cost-effective carboxylated nanodiamonds in poly (vinyl alcohol)

Nanocomposites, 2018
In this study, the high-energy ball-milled nanodiamonds (MNDs) are carefully treated with low-temperature annealing and mixed acids to obtain carboxylated MNDs (cMNDs). This process not only removes impurities but also grafts oxygen containing functional
Yuansai Zhang, Qingsong Hua, Jian Min Zhang, Yuling Zhao, Hang Yin, Zuoqiang Dai, Lili Zheng, Jie Tang   +7 more
doaj   +1 more source

Research on discharge phenomenon caused by cross‐adsorption of linear insulating fibre and metal dust under DC voltage

High Voltage, 2022
A large amount of metal dust is often generated during production and operation of Gas Insulated Switchgear/Gas‐Insulated Transmission Line, and insulating fibres are very easy to mix in during assembly.
Ruixue Liang, Qi Hu, Heng Liu, Jian Wang, Qingmin Li   +4 more
doaj   +1 more source

Research on transient stability control method for LCC‐HVDC receiving‐end system based on the gradient of dynamic energy

IET Generation, Transmission & Distribution, 2022
A new transient stability control strategy for the Line‐Commutated‐Converter based High‐Voltage‐Direct‐Current (LCC‐HVDC) receiving‐end system based on the gradient of dynamic energy is proposed to deal with this problem.
Jing Ma, Jiaming Zhang, Xucheng Wang, Ruichen Ma, Yaqi Shen   +4 more
doaj   +1 more source

Maximum performance of piezoelectric energy harvesters when coupled to interface circuits [PDF]

, 2016
This paper presents a complete optimization of a piezoelectric vibration energy harvesting system, including a piezoelectric transducer, a power conditioning circuit with full semiconductor device models, a battery and passive components.
Elliott, ADT, Halvorsen, E, Miller, LM, Mitcheson, PD, Paprotny, I, Wright, PK   +5 more
core   +1 more source

Silicon nanowire arrays coated with electroless Ag for increased surface-enhanced Raman scattering

APL Materials, 2015
The ordered Ag nanorod (AgNR) arrays are fabricated through a simple electroless deposition technique using the isolated Si nanowire (SiNW) arrays as the Ag-grown scaffold.
Fan Bai, Meicheng Li, Pengfei Fu, Ruike Li, Tiansheng Gu, Rui Huang, Zhao Chen, Bing Jiang, Yingfeng Li   +8 more
doaj   +1 more source

Designing HVDC GIS/GIL spacer to suppress charge accumulation

High Voltage, 2022
To suppress the charge accumulation on the spacer surface in direct current (DC) gas insulated transmission line (GIL) is an important and emergent issue for the development of a clean, safe and economic smart grid.
Zuodong Liang, Chuanjie Lin, Fangwei Liang, Weijian Zhuang, Yujia Xu, Lingling Tang, Yulin Zeng, Jun Hu, Bo Zhang, Chuanyang Li, Jinliang He   +10 more
doaj   +1 more source