Results 11 to 20 of about 4,393 (194)

Hybrid modulation strategy for minimizing backflow power under dual phase shift modulation

Energy Reports
The dual active bridge (DAB) converter is essential for direct current (DC) microgrids, providing galvanic isolation, high power density, and bidirectional power transfer.
Xiaoqian Yue, Fei Yu, Jiaming Qi, Haoyang Xue, Xinrui Pei   +4 more
doaj   +2 more sources

Modulation of a semi dual‐active‐bridge resonant converter with soft‐switching and zero backflow power [PDF]

IET Power Electronics, 2022
In this paper, two phase‐shift angles plus switching frequency are modulated to control a semi dual‐active‐bridge resonant converter. The full operation map with distinctive steady‐state modes under the multi‐dimensional control is constructed at first ...
Sheng‐Zhi Zhou, Xiaodong Li, Haiying Wang, Pu Huang   +3 more
doaj   +2 more sources

Experimental investigation on backflow of power-law fluids in planar fractures

Physics of Fluids, 2021
In hydrofracturing, we model the backflow of a non-Newtonian fluid in a single flat-walled fracture of planar geometry and support our conceptualization with laboratory experiments. We consider a power-law fluid, a spatially homogeneous fracture aperture, and its variation in time depending on the internal fluid pressure and the elastic relaxation of ...
A. Lenci, L. Chiapponi, S. Longo, V. Di Federico   +3 more
openaire   +4 more sources

A predictive control method for reducing power backflow in DC/AC matrix converter

Journal of Physics: Conference Series, 2021
Abstract In recent years, DC/AC matrix converter with higher power density have become an attractive alternative to traditional voltage source converters. The traditional PI control has been employed to achieve accurate control, but its dynamic response and stability need to be improved.
Zhipeng Xia, Ping Jin, Ling Chang
openaire   +1 more source

Model predictive control for DAB under extended‐phase‐shift considering components uncertainty

IET Power Electronics, 2023
For the dual active bridge (DAB) DC‐DC converters, parameter uncertainty (circuit parameters, input and/or load perturbations) affect their performance, such as the dynamic performance and backflow power.
Yongsheng Fu, Zhengting Jing, Hai‐Peng Ren   +2 more
doaj   +1 more source

Energy Characteristics of Full Tubular Pump Device with Different Backflow Clearances Based on Entropy Production

Applied Sciences, 2021
In this study, the entropy theory was used as the evaluation standard of energy dissipation, and the effect of backflow clearance (the gap between motor rotor and motor shell) on energy characteristics of a full tubular pump was investigated by 3D ...
Fan Meng, Yanjun Li, Ji Pei
doaj   +1 more source

Dual-Mode Control Scheme to Improve Light Load Efficiency for Dual Active Bridge DC-DC Converters Using Single-Phase-Shift Control

Applied Sciences, 2022
In vehicle-to-grid (V2G) applications, dual active bridge (DAB) converters are commonly used as the power interface because they offer high efficiency, galvanic isolation, and bidirectional power flow. For the DAB control strategy, phase-shift control is
Thanh Nhat Trung Tran, Wen-Yan Chang, Jian-Min Wang   +2 more
doaj   +1 more source

Hu Y. S., Wei H. J., Yu B., Yang O. X., Wang J., Wu J. Research on the vapor injection of two-stage rotary compressor / trans. from Engl. M. A. Fedorova [PDF]

Омский научный вестник: Серия "Авиационно-ракетное и энергетическое машиностроение", 2021
In order to understand the vapor injection flow characteristics of two-stage rotary compressor in the course of compression, a mathematical model based on mass conservation equation, energy equation and thermodynamic identity was established and proved
M. A. Fedorova
doaj   +1 more source

Impact of the evanescent waves on the backflow of power in the near field

Journal of Physics: Conference Series, 2019
Abstract For an elliptically polarized optical vortex with an arbitrary integer topological charge, using the expressions for all six components of the electric and magnetic field strength vectors, we obtain an expression for the longitudinal component of the Poynting vector in the initial plane.
V V Kotlyar, A A Kovalev, D S Kalinkina
openaire   +1 more source

Minimum Return Power Control for Three-Level Dual Active Hybrid Full-Bridge DC-DC Converters

Shanghai Jiaotong Daxue xuebao, 2023
Hybrid three-level full bridge (H-TLFB) DC-DC converters increase the input voltage range by introducing a three-level bridge arm. Aimed at the problems of large power return and high current stress in the traditional dual phase shift control, a minimum ...
TAO Haijun, ZHANG Jinsheng, XIAO Qunxing, ZHENG Zheng
doaj   +1 more source