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Accurate Distinction of Weak and Strong AC Grids for Emerging Hierarchical-Infeed LCC-UHVDC Systems

CSEE Journal of Power and Energy Systems 2024年第2期10卷 772-777页

作者： Hao Xiao Xianzhong Duan Yi Zhang Department of Electrical and Computer Engineering University of ManitobaWinnipeg R3T 2N2ManitobaCanada State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key LaboratorySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina RTDS Technologies Inc. Winnipeg R3T 2E1ManitobaCanada

Distinction of weak and strong AC grids for emerging hierarchical-infeed LCC-UHVDC systems is important for planning and operation departments. However, accuracy of earlier distinction methods is limited as they were developed by empirical reasoning without rigorous theoretical analysis. Hence in this letter, hierarchical-infeed interactive effective short-circuit ratio (HIESCR) index is first used for strength evaluation of HIDC systems with complex inter-inverter interactions considered. Boundary HIESCR (BHIESCR) is also introduced in the proposed distinction method of weak and strong AC grids. That is, weak (or strong) AC grids are, respectively, identified when HIESCR is less (or greater) than BHIESCR. Second, it is shown BHIESCR remains almost unchanged as 3.0 versus various system parameters and rated operation variables based on rigorous theoretical analysis. This salient feature makes the proposed method more accurate than earlier methods. Finally, the proposed method is validated by simulations based on the PSCAD/EMTDC program.

关键词： Hierarchical-Infeedinteractive effective short-circuit ratio hierarchical-infeed LCC-UHVDC systems inter-inverter interactions strong AC grids weak AC grids

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Novel Inertia Control Method with Phase-Locked Error Feedforward in PLL for DFIG-Based WTs

Novel Inertia Control Method with Phase-Locked Error Feedfor...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Yu, Jiawei Zhu, Yihua Zhou, Yini Hu, Bo Li, Zheyu Li, Xiaoyu State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou510663 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819620418

The large-scale access of wind power causes a significant reduction in the inertia of the power system, seriously threatening the security and stability of the system frequency. Inertia control methods based on the optimized PLLs provide a solution to the low inertia problem of doubly-fed inductance generator (DFIG)-based wind turbines (WTs), but they still suffer from poor dynamic performance and obvious phase-locked error in steady state. For this reason, a novel inertia control method for DFIG-based WTs is proposed in this paper to support the system frequency with better performance in all aspects. Firstly, an equivalent inertia model is deduced considering the dynamic of control and the reason why modifying PLL can realize inertia response of WT is analyzed. Then, the existing inertia control methods based on optimized PLL is introduced and a novel inertia control method with phase-locked error feed-forward in PLL (pefPLL) is proposed. After that, the inertia characteristics, dynamic performance, and steady state performance of pefPLL and other PLLs are compared. Finally, the superiority of the novel inertia control method with pefPLL is verified by simulations. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Wind turbines

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Design and Simulation of Three-Phase electromagnetic Wiping Device for Steel Strips Hot-Dip Galvanizing 26

Design and Simulation of Three-Phase Electromagnetic Wiping ...

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

作者： Chen, Weilin Han, Xiaotao Ding, Tonghai State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan National High Magnetic Field Center Wuhan China

ISBN: (纸本)9798350317589

electromagnetic wiping has the advantages of non-contact and easy control compared to traditional gas wiping. However, electromagnetic wiping devices available are primarily designed for cylindrical workpieces such as steel wire and pipes, leading to low efficiency when applied to steel strips. This paper presents a three-phase electromagnetic wiping device for hot-dip galvanizing of steel strips. Based on the traveling magnetic field of the linear motor, the device allows precise control over coating thickness by adjusting the frequency and amplitude of the current. A Multiphysics model of the electromagnetic field and fluid field is established to study the body force of the coating in a hot-dip galvanizing process. Simulation results show that the proposed wiping device can effectively remove the excess zinc liquid and reduce coating thickness. © 2023 IEEE.

关键词： electromagnetic fields

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Model and Control of Integrated Six-switch Buck-Boost and CLLLC Cascaded Converter

Model and Control of Integrated Six-switch Buck-Boost and CL...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： He, Meng Zhang, Yu Qu, Erya Chen, Yangfan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic China Eu Institute for Clean and Renewable Energy Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350307832

An integrated six-switch Buck-Boost and CLLLC cascaded converter (ISSBB-CLLLC) is proposed in this paper, which is suitable for high-voltage applications. To realize the flying capacitor voltage balance, current ripple optimization and output voltage regulation, a model of the converter is established, and a control strategy is proposed. Firstly, the balance of flying capacitor voltage in six-switch Buck-Boost circuit is analyzed, and a voltage balance control method (FCV-BCM) is proposed, which is implemented by alternatively using the redundant switching states. Next, a model of the ISSBB-CLLLC is derived and a dual closed-loop control based on phase shift control (DLC-PSC) is proposed to regulate the output voltage, which can further optimize the current ripple of inductor in six-switch Buck-Boost circuit as well. Finally, the experimental results are given to verify the effectiveness of the control strategies. © 2023 IEEE.

关键词： Buck-Boost converter

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Modeling and Analysis of DFIG-WT-Dominated Power Systems in electromagnetic Timescale Considering Negative Sequence Control

Modeling and Analysis of DFIG-WT-Dominated Power Systems in ...

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2024 IEEE Sustainable Power and Energy Conference, iSPEC 2024

作者： Guo, Zeren Zhu, Jianhang Hu, Jiabing Zhao, Guojie Wu, Zefei Du, Buyang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan China The University of Hong Kong Department of Electrical and Electronic Engineering Hong Kong

ISBN: (纸本)9798350395075

The requirement for negative sequence control introduces time-varying coupling between the positive and negative sequences in a doubly fed induction generator (DFIG). The potential risk of electromagnetic oscillation in DFIG-based wind turbine (WT)-dominated power systems (DFIG-WTPS) necessitates small-signal modeling and stability analysis considering time-varying characteristics. However, the traditional linear time-invariant (LTI) modeling method based on Park transformation is no longer suitable. Therefore, this paper applies the linear time-periodic (LTP) modeling method based on trajectory linearization to the small-signal modeling of DFIG- WTPS in electromagnetic timescale. Floquet theory is further introduced to calculate the L TP eigenvalues. Then, the influence of series capacitor and control parameters on small-signal stability is analyzed. Finally, the results from the nonlinear DFIG- WTPS model demonstrate the effectiveness of the proposed analysis. © 2024 IEEE.

关键词： Eigenvalues and eigenfunctions

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Influence of Grounded Shield on Cable Broadband Impedance Spectroscopy Measurement 9

Influence of Grounded Shield on Cable Broadband Impedance Sp...

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9th International Conference on Electrical engineering, Control and Robotics, EECR 2023

作者： Ye, Xuebin Zhang, Dandan Mo, Shi School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Key Laboratory of Pulsed Power Technology Ministry of Education Wuhan China

ISBN: (纸本)9781665491204

Fast and accurate cable fault detection is the key to reduce economic losses and improve electrical system reliability. Broadband impedance spectroscopy (BIS) is a new type of cable fault location technology, but the application of BIS technology in the actual field is still less. In particular, the grounding of cable shield in actual operation is lack of consideration is one of the reasons. In view of the grounding situation which widely occurs in the actual cable, this paper analyzes the influence of the cable shield grounding on the measuring circuit, and carries out the measurement experiments of different grounding conditions under the open and short circuit faults at the terminal of the cable. The results show that the grounding of the cable shield does not affect the accuracy of the BIS data. This simplifies the operation and reduces the risk of electric shock during the measurement, which has positive significance for the application of BIS technology in practice. © 2023 IEEE.

关键词： Cables

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Analysis of Three-Phase Short-Circuit Electromotive Force on Six Vacuum-Break Parallel-Type Generator Outlet Circuit Breakers 11th

Analysis of Three-Phase Short-Circuit Electromotive Force on...

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11th Frontier Academic Forum of Electrical engineering, FAFEE 2024

作者： Sun, Likang Chen, Lixue He, Yinghui Zou, Xinyang Li, Yingzhuo State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819787791

Currently, vacuum type generator outlet circuit breaker dominates the large-capacity generator circuit breaker. However, due to the large short-circuit current at the generator outlet end, the generator outlet circuit breaker needs to bear a great short-circuit electromotive force, thus affecting its dynamic stability. In this paper, COMSOL is used to construct a model of a six vacuum break parallel type outlet circuit breaker for the protection of a megawatt-level generator. Based on Maxwell's electromagnetic theory, the transient calculation of three-phase short-circuit electromotive force under different phases is carried out for the generator outlet vacuum circuit breaker, and the great values of short-circuit electromotive force under different phases are obtained for each phase. The results show that the main component of the short-circuit electromotive force is the electromotive force in the y-direction. And based on the maximum transient electromotive force, the influence of the material on the short-circuit electromotive force is studied, which provides theoretical support for the analysis of the short-circuit electromotive force of the generator outlet circuit breaker and the optimized design of the shell. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Electric shielding

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Modulation Strategy for Cascaded DC/DC Converter through Integration of CLLLC and Six-Switch Buck-Boost Topology

Modulation Strategy for Cascaded DC/DC Converter through Int...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Qu, Erya Zhang, Yu He, Meng Chen, Yangfan State Key Laboratory of Advanced Electromagnetic China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology WuHan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic School of Electrical and Electronic Engineering WuHan China

ISBN: (纸本)9798350307832

This paper proposes a cascaded DC/DC converter which integrates the six-switch Buck-Boost circuit with CLLLC converter by sharing a bridge arm and shows advantages of bidirectional energy flow, high voltage rating, high efficiency and wide input voltage range. First, an alternative PWM strategy (APWM) for the six-switch Buck-Boost circuit is proposed to balance its flying capacitor voltage. Next, a control method for both current ripple optimization and power control (CRO-PC) is proposed which can reduce 73.5% of current ripple. Finally, a 2 kW/ 20 kHz prototype was built to demonstrate the performance of the proposed method. © 2023 IEEE.

关键词： Buck-Boost converter

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Si-doped Li_(6)PS_(5)I with enhanced conductivity enables superior performance for all-solid-state lithium batteries

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Chinese Chemical Letters 2024年第10期35卷 479-484页

作者： Liang Ming Dan Liu Qiyue Luo Chaochao Wei Chen Liu Ziling Jiang Zhongkai Wu Lin Li Long Zhang Shijie Cheng Chuang Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Scienceand TechnologyWuhan430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China State Grid Hubei Electric Power Research Institute Wuhan 430077China College of Physics and Energy Fujian Normal UniversityFuzhou 350117China

Lithium argyrodites Li_(6)PS_(5)X(X=Cl,Br,I)show great potential as solid electrolytes for solid-state lithium batteries due to their high Li-ion conductivities and excellent electrode ***,the relatively low conductivity of Li_(6)PS_(5)I(10^(-6)m S/cm)compared to the other two compositions limits its ***,Si-doped Li_(6.5)P_(0.5)Si_(0.5)S_(5)I electrolyte is designed and synthesized with superior high conductivity of 3.6 mS/*** characterization proves the increase due to the anion disorder and volume expansion caused by ***,the poor interfacial stability between layered oxide cathode Li Ni_(0.6)Co_(0.2)Mn_(0.2)O_(2)and Li_(6.5)P_(0.5)Si_(0.5)S_(5)I inhibits its battery *** introducing Li_(3)InCl6electrolyte in the configuration,the corresponding battery delivers high initial discharge capacity of 150.2m Ah/g and superior cyclability during 250 cycles at 0.5 *** work offers design strategy to obtain Li_(6)PS_(5)I-based electrolytes for high performance solid-state batteries.

关键词： Argyrodite electrolyte Li_(6.5)P_(0.5)Si_(0.5)S_(5)I All-solid-state lithiumbatteries Stability Electrochemical performance

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Experimental Study on Electrode Erosion Process with High Current Vacuum Arc 19th

Experimental Study on Electrode Erosion Process with High Cu...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Peng, Ruochen Li, Yilong Zhao, Yuan Chen, Lixue Ya, Penglong Lyu, Tianmao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science & Technology Wuhan China School of Electrical and Electronic Engineering Huazhong University of Science & Technology Wuhan China Key Laboratory of Pulsed Power Technology Huazhong University of Science & Technology Ministry of Education China

ISBN: (纸本)9789819613861

During the breaking process, the erosion of anode contact greatly affects the result of high current vacuum breaking. Therefore, it is important to study the forming and transforming process of anode modes for improving the breaking performance and life of vacuum circuit breaker. The cup axial magnetic field (AMF) contacts is widely used in vacuum trigger switch and vacuum on-load tap changer. In order to study the vacuum arc characteristics and anode mode change of cup AMF contacts under high current density, the 40 mm diameter cup AMF contacts with six slots is observed and studied by experimental means under the gap distance of 6 mm and 10 mm. In this paper, the arc current-voltage characteristics, vacuum arc shape and surface erosion of contact are analyzed. The analysis results show that the larger the contact gap, the larger the arc voltage, the smaller the arc anode mode threshold current and the more serious the contact erosion degree. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Anodes

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