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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...

引用

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...

引用

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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Static Hysteresis Process Modeling Based on Modified Tellinen Hysteresis Model 6

Static Hysteresis Process Modeling Based on Modified Telline...

引用

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

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

引用

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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A Denoising Scheme for Core Earth Current of Power Transformers 3

A Denoising Scheme for Core Earth Current of Power Transform...

引用

3rd International Conference on Electrical engineering and Control Science, IC2ECS 2023

作者： Wu, Zhe Li, Zhaohui Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350382426

The core earth current (CEC) is composed of a variety of components, some of which can reflect the health status of power transformers, such as the power frequency and its harmonic components can reflect power transformer core grounding state and core saturation degree, and some pulse components can reflect partial discharge in power transformers. Some high-frequency components can reflect the external shock (very fast transient overvoltage, lighting, etc.) suffered by power transformers. There are also some noise components introduced by ambient environment and measurement system. The existing CEC monitoring devices focus on part of the components, such as the power frequency and its harmonic components or partial discharge pulse component. Both devices are difficult to catch all anomalies in CEC. A current transformer (10Hz-200kHz) is used to sense CEC continuously to catch all abnormal waveforms in CEC. In order to extract the pulse components in CEC, a denoising scheme based on mathematical morphological (MM) filter and wavelet shrinkage is devoted. MM filter can suppress the low frequency component while maintaining the integrity of pulse components. For the purpose of filtering out the white noise in the signal and preserve the complete pulse waveform as much as possible, a new wavelet selection method that the optimum wavelet at each level is selected as the one maximizing the energy ratio of detailed coefficients beside and inside the range formed by the threshold is devoted. Simulated data and field data are used to compare several different wavelet selection methods, and the experimental results show that the pulse distortion extracted by this method is smaller than other methods. © 2023 IEEE.

关键词： core earth current (CEC) mathematical morphology power transformers signal denoising wavelet shrinkage

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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...

引用

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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Study on the Influence of Control Grid on the Emission Characteristics of Cathode Assembly

Study on the Influence of Control Grid on the Emission Chara...

引用

2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Xiong, Mianzhi Zhou, Zijian Huang, Jiang School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

Low-energy electron curtain accelerators are widely used in the field of radiation processing. In this paper, the model of the cathode emission assembly of the multi-filament electron curtain accelerator is established by CST simulation software, and the influence of the duty ratio and grid width of the semi-cylindrical control grid on the current emission characteristics of the cathode assembly is explored. It is found that the larger the duty ratio of the control grid and the wider the mesh grid width, the emission current and the current drawn at control grid increase. Especially when the width of mesh grid reaches 3mm, the current emission characteristics of the cathode assembly no longer conform to the three-half law. The research work in this paper has reference significance for the construction and design of cathode assembly. © 2024 IEEE.

关键词： Field emission cathodes

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An Energy-Communication Network Restoration Strategy under Joint Dispatch of Drone Small Cell and Maintenance Personnel 3

An Energy-Communication Network Restoration Strategy under J...

引用

3rd International Conference on Energy engineering and Power Systems, EEPS 2023

作者： Wang, Tao Huang, Zixin Li, Zhao Zhang, Zhiyu Lin, Xiangning Li, Zhengtian Wei, Fanrong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350313857

Currently, the restoration of energy and communication networks in post-disaster power distribution systems is often considered independently, lacking effective coordination. To address this issue, this paper proposes a post-disaster recovery strategy for the energy-communication network of power distribution systems that involves coordinated scheduling of drone small cell (DSC) and maintenance personnel (MP). Firstly, scheduling models of DSC and MP are established to quantitatively analyze their temporal and spatial characteristics. Then, a post-disaster recovery strategy is proposed for the energy-communication network under the coordinated scheduling of DSC and MP. The energy-communication network is restored with the objective of minimizing the operating costs of the post-disaster power distribution system. The effectiveness of the proposed strategy is verified through numerical simulations based on an improved IEEE 33-node distribution network. © 2023 IEEE.

关键词： Operating costs

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Star-Connected Modular Auxiliary Resonant Commutated Pole Inverter with Commutation-Aligned PWM Modulation 26

Star-Connected Modular Auxiliary Resonant Commutated Pole In...

引用

26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Ding, Zehuan Gan, Chun Shi, Haochen Ni, Kai Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350317589

This paper proposes a modular auxiliary resonant commutated pole (MARCP) inverter. The MARCP inverter eliminates the need for a connection to the DC bus or midpoint potential and has the same resonant branch for each phase, which enables its modular combination with any phase of inverters. During the operation of the proposed MARCP inverter, resonant currents are constructed in the commutation front through the voltage difference between the three bridge arms, which makes all the bridge arms resonantly commutated at the commutation-aligned moment. After commutation, resonant currents feedback to the power source. All the switches of the MARCP inverter can achieve soft-switching or pseudosoft-switching during the full switching period. In this paper, the effectiveness of the proposed topology and control method is verified by simulation. Compared with the auxiliary resonant commutated pole (ARCP) inverter, the MARCP inverter eliminates the coupling inductor or voltage dividing capacitor, which reduces the device requirement and size of the inverter. Furthermore, the main circuit and resonant circuit of the MARCP inverter are independent of each other, which is convenient for repairing and converting the hard-switching to soft-switching. © 2023 IEEE.

关键词： Pulse width modulation

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