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9th International Conference on Energy Materials and Electrical engineering, ICEMEE 2023

作者： Qiao, Jian He, Rufei Yin, Xianggen Ma, Yiming Lu, Qinghui Peng, Yumin Wang, Wenhui Zhang, Hao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China CSG PGC Power Storage Research Institute Guangzhou510950 China

ISBN: (纸本)9781510672765

In this paper, the characteristics of power oscillation of pumped storage synchronous motor under pumped condition are studied, and the causes of misoperation of conventional low power protection are analyzed. Based on digital simulation and actual data analysis, a multi-stage low power protection is proposed. The power setting value of each section matches the delay setting value, which can adapt to the characteristics of motor power oscillation and effectively solve the misoperation problem of conventional low power protection. The simulation results show that its performance is stable and reliable, and the problem of misoperation of conventional low power protection is solved. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Failure analysis engineering Silver Analytical research Design and modelling Reliability Frequency modulation Phase modulation Safety Power grids

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An Improved Simplified Model of Capacitor Charging Power Supply with Homopolar Inductor Alternator Considering Field Flux Linkage and Speed Changes 6

An Improved Simplified Model of Capacitor Charging Power Sup...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Guo, Songlin Yu, Kexun Yi, Zhengkang Wang, Jiasong Xie, Xianfei Yao, Jiakang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Tsinghua University State Key Laboratory of Tribology Beijing China

ISBN: (纸本)9798350346671

Homopolar inductor alternator (HIA) has shown its promising advantages in capacitor charging power supply (CCPS). For accelerating HIA-CCPS system design process, researchers have been making efforts to simplify the simulation analysis, but the models were not universal or effective enough. In this paper, a simplified look-up-table model considering the changes of speed and field flux linkage in HIA-CCPS is proposed. While realizing fast calculation, it can also reflect the dynamic process similar to the transient model, which is very exact and effective. © 2023 IEEE.

关键词： Table lookup

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The importance of coil conductivity and eddy current effects in the analysis of electromagnetic forming process

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High Voltage 2022年第2期7卷 390-404页

作者： Quanliang Cao Liangyu Xia Xian Li Limeng Du Zhipeng Lai Xiaotao Han Liang Li Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhanChina State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanChina

Coil design and performance analysis are critical for the electromagnetic forming(EMF)***,previous studies have paid little attention to the coil con-ductivity,and the influence of eddy current effects in coil conductors on the forming process has not been well *** work aims to address these problems through numerical and experimental *** is found that,due to the eddy current effects,the uneven current distribution appears in the coil conductors that should be considered when analysing the forming process,especially for the cases with large heights of coil ***,an important and interesting discovery is that the eddy current effects can greatly reduce the sensitivity of the coil conductivity with respect to the workpiece deformation,the Joule heating and the temperature rise in the *** instance,compared to a forming system with a copper coil,the forming height of the workpiece in the forming system with an AA5083‐O coil is reduced by less than 5%under the same discharge energy,while the copper conductivity is 3.3 times that of the *** results are helpful to understand the EMF process and achieve the optimal design of coils.

关键词： conductivity process workpiece

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Analysis on Circulating Current and Split Capacitor Voltage Balance for Modular Multilevel Converter Based Three-phase Four-wire Split Capacitor DSTATCOM

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Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 657-667页

作者： Lei Lin Jialu He Chen Xu State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

We propose a modular multilevel converter(MMC)based three-phase four-wire(3P4W)split capacitor distribution static synchronous compensator(DSTATCOM),aiming at compensating unbalanced and reactive load *** to the zero-sequence current compensation,the circulating current char-acteristics of 3P4W MMC-DSTATCOM are different from conventional ***,the distinct working principle of IMMC would affect the features of split capacitor *** decoupled positive-,negative-and zero-sequence second-order and DC components of the circulating current are deduced *** proportional-integral controllers with dual dq transformation are employed to suppress the positive-and negative-sequence components of second-order circulating current,while quasi proportional-resonance controller is designed to eliminate the zero-sequence ***,the phenomenon of the unbalanced split capacitor voltages is revealed,and fast-tracking balancing method by controlling zero-sequence current flowing through the split capacitors is *** simulation results verify the accuracy of the analysis and the feasibility of the suppression methods.

关键词： Circulating current modular multilevel converter(MMC) distribution static synchronous compensator(DSTATCOM) split capacitor three-phase four-wire(3P4W)

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Operation Optimization of Combined Wind Storage System Based on Electrochemical Energy Storage Life 5

Operation Optimization of Combined Wind Storage System Based...

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5th International Conference on Advances in Electrical engineering and Computer Applications, AEECA 2024

作者： Yang, Tianmeng Liu, Jicheng Feng, Wei Chen, Zelong Liu, Peiyu Northeast Branch of State Grid Corporation of China Power Grid Technology Center Shenyang China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350355253

To mitigate the intermittency and volatility of large-scale wind farms and alleviate their impacts on traditional fossil fuel-based power units, this paper proposes an integrated wind-storage system based on the operational cost of the power system. This system incorporates large-scale wind power generation and considers diverse service life models as well as the capacity of the electrochemical energy storage. Employing a multi-objective optimization algorithm, this study optimizes the output scheduling of both the electrochemical energy storage and the pumped-hydro energy storage system, ensuring the full integration of wind power into the grid while compensating for deviations in wind power output. The objective is to minimize the operational cost of the power system and reduce the equivalent load fluctuations after the integration of the combined wind-storage system into the grid. Simulation experiments demonstrate the feasibility and rationality of the proposed integrated wind-storage system. © 2024 IEEE.

关键词： Wind power integration

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Characterization of Lorentz Force Distribution in electromagnetic Repulsion Mechanism of Multiple Parallel Circuit Breakers 7

Characterization of Lorentz Force Distribution in Electromag...

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7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： He, Yinghui Chen, Lixue Yuan, Zhao Xu, Shengqin Sun, Likang Zou, Xinyang School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education Wuhan China

ISBN: (纸本)9798350345094

In order to meet the requirements of parallel circuit breaker opening rapidity and synchronization, a new structure of electromagnetic repulsion mechanism (EMRM) is proposed in this paper. A three-dimensional transient flexible body model of the mechanism was built in COMSOL. Simulation results show that the EMRM can reach the rated opening distance of 20mm in 4.86ms, and the maximum stress during the motion is 246MPa. There is vibration in the motion process due to the uneven distribution of Lorentz force, and the vibration is periodic. The maximum stress is related to the vibration characteristics. Through theoretical derivation and simulation analysis, an analytical formula describing the relationship between the Lorentz force distribution and structural parameters is proposed in this paper. Error between the formula results and the simulation results is less than 4.5%. The analytical formula can be applied to parameter design. © 2023 IEEE.

关键词： Electric circuit breakers

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New Sliding Mode Control Algorithm of Magnetic Bearing Based on State Feedback Decoupling

New Sliding Mode Control Algorithm of Magnetic Bearing Based...

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

作者： Liu, Haoqi Ye, Caiyong Wang, Tianyu Zhao, Yunfeng School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China National Center for Quality Inspection and Test of Motors Anhui China

ISBN: (纸本)9798331530174

A new sliding mode control method based on state feedback decoupling is introduced, which solves the problem of poor decoupling control effect of traditional control strategy on active magnetic bearing (AMB). In this paper, magnetic bearing system is divided into four independent subsystems by using the principle of linear state feedback. Secondly, considering the shortcomings of the traditional controller, a nonlinear nonsingular terminal sliding mode controller with terminal sliding mode is proposed. Aiming at the chattering problem in sliding mode control, an easy-to-implement sigmoid function is designed to replace the traditional discontinuous switching function. Finally, by building a simulation model and conducting simulation experiments, it is proved that the control strategy combining the above two methods can improve the control accuracy, response speed and robustness of the magnetic bearing control system. © 2024 IEEE.

关键词： Sliding mode control

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A Blockchain-Based Microgrid Measurement Data Storage and Tampering Detection Framework 37th

A Blockchain-Based Microgrid Measurement Data Storage and Ta...

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37th Annual Conference on Power System and Automation in Chinese Universities, CUS-EPSA 2022

作者： He, Yixuan Wang, Jingyu Shi, Dongyuan School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9789819914388

With the rapid development of distributed power generation and microgrids, secure storage of microgrid measurement data becomes an imminent issue. In order to defend against cybersecurity threats, a microgrid measurement data storage framework should not only ensure the integrity and traceability of the stored microgrid measurement data, but also be able to detect any malicious data tampering. In this paper, a microgrid measurement data storage framework based on Hyperledger Fabric, a blockchain technology, is proposed and implemented, on top of which a data tampering detection method based on the uniqueness of the transaction number (TxId) and the Strong Collision-Resistant of hash theory is developed. Case studies show that the proposed framework can well meet the requirement of data storage traceability, transparent sharing, and tampering resistance, and the requirement of automatic data tampering detection, which provides a new research idea and direction for the future study in microgrid measurement data storage. © 2023, State Grid Electric Power.

关键词： Blockchain

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Contact Pressure Calculation Based on Vacuum Contact Materials and Operating Conditions 7

Contact Pressure Calculation Based on Vacuum Contact Materia...

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7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Xu, Shengqin Chen, Lixue Yuan, Zhao He, Yinghui Zou, Xinyang Sun, Likang School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education Wuhan China

ISBN: (纸本)9798350345094

Pressure of vacuum circuit breaker contacts should meet the requirements of contact resistance, and inhibit contact bounce when short-circuit current is flowing. However, the value of contact pressure is often obtained empirically. This paper analyzes the worst electrical contact conditions based on the contact resistance of the electrical contact surfaces, and propose a method to calculate the contact pressure based on contact material, radius and short-time current withstand, which is based on the melting of the conductive spots. Finally, hrough the comparison of several sets of working conditions, it is verified that the calculation method is effective. © 2023 IEEE.

关键词： Contact resistance

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Exploration of the application of stellarator-like external rotational transform on the J-TEXT tokamak 50

Exploration of the application of stellarator-like external ...

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50th EPS Conference on Plasma Physics, EPS 2024

作者： Li, Y.B. Rao, B. Wang, N.C. Mao, F.Y. Li, K.Z. Zhou, S. Jiang, Z.H. Ding, Y.H. Suzuki, Y. International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology China Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima739-8527 Japan

ISBN: (纸本)9798331305239

The major disruption of tokamak plasma poses a great threat to safe operation of the device. Future fusion reactors are intolerant of major disruption, so developing control methods are crucial for disruption mitigation. Previous experiments on current-carrying stellarators and hybrid devices have demonstrated the potential for disruption avoidance and suppression of Magnetohydrodynamic (MHD) activity on tokamak by introducing increasing levels of rotational transform from stellarator- like helical coils. To explore innovative approaches for optimizing tokamak configurations and combining the strengths of both tokamaks and stellarators, a set of 3D External Rotational Transform (ERT) coil system has been designed and installed in the J-TEXT tokamak. The ERT coil system consists of two helical coils and is installed inside the vacuum vessel. Simulation results, via HINT2 and MIPS, indicate that the application of ERT coils results in hybrid configurations, which lead to non-axisymmetric plasma shapes, modification of the q profile, and improvement in plasma stability. The successfully installation of the ERT coil system on J-TEXT has yielded preliminary experimental results that align with the design objectives. © 2024 50th EPS Conference on Plasma Physics, EPS 2024. All rights reserved.

关键词： Stellarators

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