Results 291 to 300 of about 2,950,870 (336)

Research on DC bias analysis for transformer based on vibration Hilbert Huang transform and ground-state energy ratio method

International Journal of Electrical Power & Energy Systems, 2019
With the development and construction of (high voltage direct current) HVDC system, more and more DC bias problems caused by monopole operation of HVDC are appeared in grid which leads to efficiency droop or potential risk of transformer.
Xingmou Liu, Jiaxin Wu, Haibo Lin, A. Jadoon, Jing Wang   +4 more
semanticscholar   +1 more source

Origin of significantly enhanced dielectric response and nonlinear electrical behavior in Ni2+-doped CaCu3Ti4O12: Influence of DC bias on electrical properties of grain boundary and associated giant dielectric properties

Ceramics International, 2019
CaCu3-xNixTi4O12 (x = 0, 0.05, and 0.10) powders were synthesized using a solid state reaction method. Phase structure and microstructure analyses revealed that all sintered CaCu3-xNixTi4O12 ceramics were of a pure phase.
Jakkree Boonlakhorn, B. Putasaeng, P. Thongbai   +2 more
semanticscholar   +1 more source

DC Bias Treatment of Hybrid Type Transformer Based on Magnetic Flux Modulation Mechanism

IEEE transactions on magnetics, 2019
According to the incomplete technical features of the traditional low-frequency transformer (LFT) and the existing power electronic transformer (PET), especially in terms of the function, the voltage level, and the cost, the core flux modulation of the ...
Zhiwei Chen, Hongmei Li, Liuwen Liu, Li Xiang, B. Bai   +4 more
semanticscholar   +1 more source

A Novel Control Method for Eliminating DC Bias in Dual-Active-Bridge DC-DC Converters

2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC), 2018
This paper proposes a novel transient current control method for dual-active-bridge (DAB) dc-dc converters. When sudden load transients or reference change, the dc bias of inductor current will occur under the traditional control method, which may cause induce magnetic-flux saturation and excessive current spike in the loop.
Kai Li, Yue Wang, Jinghui Xu, Jianpeng Wang, Rui Li, Chunhui Lv   +5 more
openaire   +1 more source

An Improved DC Bias Elimination Strategy with Extended Phase Shift Control for Dual-Active-Bridge DC-DC

ACM Cloud and Autonomic Computing Conference, 2019
The minimum current stress model based on Dual active bridge (DAB) DC-DC converter is adopted, which is the independent variable of power transmission. In this paper, the phenomenon of dc bias caused by the sudden change of transmission power is analyzed,
Zhao Zhang, Jiazheng Sun, Panfeng Wang, Zhiyang Cai, Jianhong Kong, Xue Bai, Dazhong Ma   +6 more
semanticscholar   +1 more source

A Prediction Method of DC Bias for DC-DC Dual-active-bridge Converter with MOSFETs

2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA), 2019
The dual-active-bridge (DAB) converter attracts more and more attentions due to its ability of bidirectional power transmission and high conversion efficiency. The adoption of high-frequency transformer provides galvanic isolation, but also brings the possibility of de bias.
Dong Yuan, Jinggang Yang, Yang Liu, Yongyong Jia, Ruihuang Liu, Zhanfei Song   +5 more
openaire   +1 more source

Dual loop control for eliminating DC-bias in a DC-DC dual active bridge converter

2014 International Conference on Renewable Energy Research and Application (ICRERA), 2014
In bi-directional dual active bridge (DAB) converters, non-ideal behavior of the system components can lead to dc bias in the converter which results in magnetic saturation of the high frequency transformer. This paper proposes adding an extra control loop to overcome this problem.
Bhanu Prashant Baddipadiga, Mehdi Ferdowsi   +1 more
openaire   +1 more source

Design of dc-bias resilient transformers

Geomagnetic disturbances (GMDs) give rise to geomagnetically induced currents (GICs) on the earth’s surface which find their way into power systems via grounded transformer neutrals. The quasi-dc nature of the GICs results in half-cycle saturation of the power grid transformers which in turn results in transformer failure, life reduction, and other ...
openaire   +1 more source

Transient DC Bias Current Reducing for Bidirectional Dual-Active-Bridge DC–DC Converter by Modifying Modulation

IEEE transactions on power electronics, 2021
Caiwei Yang, Jian Wang, Chenchen Wang, X. You, Lei Xu   +4 more
semanticscholar   +1 more source

dc bias-sputtered aluminium films

Vacuum, 1973
openaire   +1 more source