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Efficient direction-independent fog harvesting using a corona discharge device with a multi-electrode structure

Plasma Science and technology 2022年第9期24卷 98-107页

作者： Dingchen LI Chuan LI Jiawei LI Wendi YANG Menghan XIAO Ming ZHANG Yong YANG Kexun YU International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Efflcient collection of water from fog can effectively alleviate the problem of water shortages in foggy but water-scarce areas,such as deserts,islands and so *** inefflcient fog meshes,corona discharge can charge water droplets and further enhance the water-collecting *** study proposes a novel multi-electrode collecting structure that can achieve efflcient and direction-independent water collection from *** multi-electrode structure consists of three parts:a charging electrode,an intercepting electrode and a ground *** types of watercollecting structures are compared experimentally,and the collection rates from a traditional fog mesh,a wire-mesh electrode with fog coming from a high-voltage electrode,a wire-mesh electrode with fog coming from a ground electrode and a multi-electrode structure are 2–3 g h^(-1),100–120 g h^(-1),60–80 g h^(-1)and 200–220 g h^(-1),*** collection rate of the multielectrode structure is 100–150 times that of a traditional fog mesh and 2–4 times that of a wiremesh *** results demonstrate the superiority of the multi-electrode structure in fog *** addition,the motion equation of charged droplets in an electric fleld is also derived,and the optimization strategy of electrode spacing is also *** structure can be applied not only to fog collection,but also to air puriflcation,factory waste gas treatment and other flelds.

关键词： fog collection corona discharge wire-mesh electrode multi-electrode structure collection rate

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Research on Coupling Simulation Method of Temperature Field and Stress Field in Double-Layer Thin-Walled Corrugated Tube 18th

Research on Coupling Simulation Method of Temperature Field ...

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Tong, Yingjie Cai, Jiaqi Peng, Sisi Chen, Lingxuan Ding, Xuan Xu, Ying Li, Xianhao State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Electromagnetic Energy Wuhan Institute of Marine Electric Propulsion Wuhan430064 China

ISBN: (纸本)9789819710676

In recent years, with the increasing power load in major cities in China, the existing conventional power cables are unable to meet the high-density and high-capacity power transmission requirements. High-temperature superconducting cables, with their characteristics of high capacity, low loss, compact structure, energy-saving, and environmental-friendliness, have promising applications for future urban high-density power transmission. As one of the key components in the cryogenic refrigeration system of superconducting cables, the mechanical performance of double-layer thin-walled stainless steel corrugated tubes directly determines the ability of superconducting cables to resist external forces. In order to study the mechanical performance of double-layer thin-walled stainless steel corrugated tubes under the operating conditions of superconducting cables, this paper establishes a three-dimensional shell model of double-layer thin-walled stainless steel corrugated tubes under tension and bending conditions using finite element simulation. It analyzes the stress and plastic strain distribution characteristics of the double-layer thin-walled corrugated tubes and proposes a temperature field and stress field coupling simulation method for double-layer thin-walled corrugated tubes. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Finite element method

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Online Multiparameter Estimation with Position Error Correction for Unified Synchronous Machine Sensorless Drives

Online Multiparameter Estimation with Position Error Correct...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Liu, Zirui Kong, Wubin Fan, Xinggang Wang, Fei Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350316445

Parameters' accuracies are essential for model-based sensorless control in synchronous machine drives. In this paper, a multiparameter adaptive observer and a position error optimizer are presented to obtain real-time parameter information in the absence of rotor position data for unified synchronous machine (SM). The adaptive observer is based on the misaligned dq-axes' small-signal impedance model where dq-axes EMF coupling terms are well considered. All parameters can achieve high accuracy under entire operation region. In the case of isotropic SMs, the estimated parameters can be directly utilized in the model-based observer to acquire high precision position observation. And, for anisotropic SMs, an optimizer is introduced to correct parameter inaccuracies caused by position error. The effectiveness of the proposed adaptive observer and optimizer is evaluated through a combination of experiments and simulations, providing comprehensive validation of their performance. © 2023 IEEE.

关键词： Multiparameter Estimation Sensorless Control Unified Synchronous Machine (SM)

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Switch Open-Circuit Faults Diagnosis in Three-Phase PWM Rectifier Based on Phase and Transient Model

Switch Open-Circuit Faults Diagnosis in Three-Phase PWM Rect...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Lin, Zhongdong Peng, Li Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350307832

Numerous studies have shown that the power switch devices have high fault rate in converters. Aiming at above problem, this paper proposes a switch open-circuit faults (SOCF) diagnosis method in three-phase pulse-width modulation (PWM) voltage source rectifier (VSR). The diagnosis algorithm is based on phase information from the phase-locked loop (PLL) and line voltage deviations calculated by the transient model. The proposed method can accurately and rapidly diagnose all kinds of single and double SOCF, without extra hardware. Finally, simulations in MATLAB/Simulink verify the robustness and effectiveness of the proposed method. © 2023 IEEE.

关键词： Pulse width modulation

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Size Design of the Storage Tank in Liquid Hydrogen Superconducting Magnetic Energy Storage Considering the Coupling of Energy and Matter

Size Design of the Storage Tank in Liquid Hydrogen Supercond...

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2023 IEEE Sustainable Power and Energy Conference, iSPEC 2023

作者： Wang, Chuang Li, Li Song, Meng Xu, Ying Hu, Kewei Zhong, Zhiyao Yang, Zhixing Fang, Jiakun State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798350322699

The liquid hydrogen superconducting magnetic energy storage (LIQHYSMES) is an emerging hybrid energy storage device for improving the power quality in the new-type power system with a high proportion of renewable energy. It combines the superconducting magnetic energy storage (SMES) for the short-term buffering and the use of liquid hydrogen as both the bulk energy carrier and coolant. The storage tank is the core component of LIQHYSMES where the energy and matter are coupled. Therefore, this paper proposes the size design model for the storage tank in order to minimize the whole costs of LIQHYSMES. The thermal interactions between the SMES and hydrogen of both charging and discharging states are explicitly analyzed through the proposed model. Particularly, the phase transition of hydrogen in the storage tank, the charging state and thermal effect of SMES and the control strategy of electricity-hydrogen devices are modelled. Finally, case studies verified the effectiveness of the proposed model and the parameters of the storage tank are given. © 2023 IEEE.

关键词： coupling of energy and matter liquid hydrogen liquid hydrogen superconducting magnetic energy storage

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Characteristics Analysis of Three-Phase Symmetrical Phase-Locked Loop under Non-Ideal Grid Conditions

Characteristics Analysis of Three-Phase Symmetrical Phase-Lo...

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2023 IEEE International Conference on Power Science and technology, ICPST 2023

作者： Su, Tianyi Lin, Hua Li, Shaojie Wang, Xingwei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350311358

Under weak grids, the output impedance of grid-connected inverter is coupled with the grid impedance, leading to poor quality of the grid current. To address this issue, the symmetrical phase-locked loop (PLL) has been proposed which can eliminate the frequency coupling and attribute the system model to be symmetrical. Although the system performances well under steady state, the characteristics of the inverter is unclear under non-ideal conditions at present. In this article, by investigating the inverter performance with the symmetrical PLL under different grid conditions, it is founded that both the dynamic and steady-state characteristics become worse compared to that with synchronous reference frame (SRF) PLL. The experiments validate the correctness of the theoretical analysis. © 2023 IEEE.

关键词： Phase locked loops

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Research on the New technology of Uninterruptible Electric Ice Melting in Distribution Network 3

Research on the New Technology of Uninterruptible Electric I...

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3rd Power System and Green Energy Conference, PSGEC 2023

作者： Xie, Xiong Yin, Hao Yang, Xiao Wang, Weiyu Li, Dayi Xu, Jiaxin Li, Jing Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350340099

To deal with the icing of overhead lines caused by frequent ice disasters, this subject proposes a new uninterruptible electric ice-melting technology for distribution network. The deicing device is composed of adjustable reactor and earthing transformer. The head end of the device is connected to the substation power supply through a transformer, and the end is short-circuited with one-phase line in the ice- covered section through a ground wire to form a zero-sequence circuit, so as to provide zero-sequence current to the line to be deiced online to make the line heat up and melt the ice to achieve deicing without power outage. After the article puts forward this scheme, the model was built in Maxwell 3D software for verification, and the ice melting test is carried out on the pilot line, which proves the feasibility of this scheme. © 2023 IEEE.

关键词： Software testing

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Static Hysteresis Process Modeling Based on Modified Tellinen Hysteresis Model 6

Static Hysteresis Process Modeling Based on Modified Telline...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Zhang, Yubo Chen, Dezhi Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350346671

Modeling the process of the static magnetic hysteresis accurately is essential to compute the magnetic fields of electrical devices and components, and a modified static hysteresis model based on Tellinen hysteresis model is presented and verified in this paper. Only two measured ascending curves are needed to solve this static model, rather than the limiting loop, which is friendly to measuring device. By comparing the measured static hysteresis curves with the calculated static hysteresis curves, it is found that the static model shows good efficiency and accuracy, and the error caused by Tellinen hysteresis model itself could be negligible when the two measured curves the model demands are close to the curve to be computed. © 2023 IEEE.

关键词： Magnetic materials

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Research on A Controllable Reactor Realized by Multi-Winding Transformer 3

Research on A Controllable Reactor Realized by Multi-Winding...

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3rd Power System and Green Energy Conference, PSGEC 2023

作者： Wang, Weiyu Xie, Xiong Yin, Hao Li, Dayi Li, Jing Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350340099

Controllable reactors (CR) are general FACTS (Flexible AC Transmission System) apparatuses, which have played a crucial role in improving the power flow distribution of the system, adjusting the reactive power balance of the power grid, stabilizing the voltage, and improving the stability of the system. This paper summarizes the characteristics of various types of controllable reactors, classifies reactors with different structures, and compares different controllable reactors from the perspectives of reactance change, response speed, harmonic problem, and control accuracy. A transformer-type controllable reactor based on flux compensation is proposed, the design scheme of secondary side multi-winding is adopted to realize the large-capacity reactor, the unity of single control winding and multi-control winding in the application is expanded, and the general principle of controllable reactor is obtained through the control of the 'linear two-port network' port, and the design principle of such reactor is summarized. © 2023 IEEE.

关键词： Flexible AC transmission systems

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Synergetic effects of atmospheric plasma and UVA treatment for eye infection pathogens disinfection 6

Synergetic effects of atmospheric plasma and UVA treatment f...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Li, Mengqi Li, Yuhan Xiong, Zilan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology WuHan China

ISBN: (纸本)9798350346671

We report a combined method of using atmospheric surface micro-discharge (SMD) with UVA exposure to provide a fast and efficient method against eye infection pathogens. 4 kinds of typical eye infection bacteria were chosen and treated under SMD treatment only, UVA exposure only and 5min SMD treatment followed by 1 or 2 min UVA exposure in buffered solution. The combination of plasma treatment and UVA exposure presented the best antibacterial effect, especially for the UV-resistant bacteria strain, Serratia marcescens. This synergetic method has been found to have no selectivity on bacterium type. The possible mechanism of the synergetic effects was preliminarily proved to be caused mainly by photodecomposition of nitrite. UVA photolysis analysis of pure nitrite, H2O2 solution and their mixture indicated the formation of peroxynitrite in buffered solution partly contributed to the anti-bacterial effect in this work. © 2023 IEEE.

关键词： Bacteria

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