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16th IEEE PES Asia-Pacific Power and Energy engineering Conference, APPEEC 2024

作者： Li, Chao Ma, Xin Zhou, Lei Ding, Maosheng Chen, Xia School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Electric Power Research Institute State Grid Ningxia Electric Power Co. Ltd Yinchuan750002 China

ISBN: (纸本)9798350386127

Battery energy storage systems (BESS) are widely adopted for frequency regulation in regional power grids. However, their limited capacity is inadequate for long-term power compensation, often curtailing wind and PV generation. This paper combines hydrogen energy storage with BESS to create a hybrid hydrogen-electric power station. A hierarchical coordinated control strategy based on model predictive control (MPC) is proposed for the hybrid power station. The lower layer applies MPC to enhance the BESS's ability to smooth grid frequency fluctuations, enabling faster and more accurate tracking of upper-level power commands. The upper layer optimizes the power generation cost and manages the state of Charge (SOC) of the BESS to reduce the power and capacity allocation of the BESS and improve the service life of each unit. In high-penetration renewable energy microgrids, the proposed strategy's frequency regulation capability, SOC management, and cost optimization were simulated and validated. © 2024 IEEE.

关键词： Hybrid power

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An ISGW Filtering Antenna with Spurious Modes and Surface Wave Suppression for Millimeter Wave Communications

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China Communications 2023年第11期20卷 1-12页

作者： Lihui Wang Dongya Shen Qiuhua Lin Zhiyong Luo Wenjian Wang Jianpei Chen Zhao Gao Wei Zhang School of Electronics and Communication Engineering Sun Yat-sen UniversityShenzhen 518107China School of Information Science and Engineering Yunnan UniversityKunming 650091China Kuang-Chi Institute of Advanced Technology&State Key Laboratory of Meta-RF Electromagnetic Modulation Technology ShenzhenChina School of Electrics and Information Engineering Yunnan Minzu UniversityKunmingChina Institute of Telecommunication and Navigation Satellites China Academy of Space TechnologyBeijing 100094

In this paper,an integrated substrate gap waveguide(ISGW)filtering antenna is proposed at millimeter wave band,whose surface wave and spurious modes are simultaneously suppressed.A secondorder filtering response is obtained through a coupling feeding scheme using one uniform impedance resonator(UIR)and two stepped-impedance resonators(SIRs).To increase the stopband width of the antenna,the spurious modes are suppressed by selecting the appropriate sizes of the ISGW unit ***,the ISGW is implemented to improve the radiation performance of the antenna by alleviating the propagation of surface *** an equivalent circuit is investigated to reveal the working principle of *** demonstrate this methodology,an ISGW filtering antenna operating at a center frequency of 25 GHz is designed,fabricated,and *** results show that the antenna achieves a stopband width of 1.6f0(center frequency),an out-of-band suppression level of 21 dB,and a peak realized gain of 8.5 dBi.

关键词： filtering antenna integrated substrate gap waveguide millimeter wave communications spurious modes suppression surface wave suppression

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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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Capacitance loss characteristics of metallized film capacitors under atmospheric corrosion

Capacitance loss characteristics of metallized film capacito...

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2022 IEEE International Conference on High Voltage engineering and Applications, ICHVE 2022

作者： Qiu, Tian Li, Hua Li, Zheng Lin, Fuchang Zhang, Qin Li, Liuxia Wang, Yan School of Electrical and Electronic Engineering Huazhong University of Science & Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407502

As the key components, metallized film capacitors (MFCs) are widely used in power system. Working at high temperature and humidity conditions, oxygen and moisture in atmosphere will permeate into MFCs and initiate electrode corrosion, which contributes to capacitance loss, and thus the reliability is reduced. In this work, a capacitance loss model for atmospheric corrosion is proposed to study the aging pattern of MFCs. Accordingly, an accelerated aging test with different temperature-humidity combinations is carried out to investigate the corrosion behavior at various temperature and humidity conditions. The results indicate the corrosion sites tend to distribute around the fibers on polymer films. The capacitance loss rate declines along time because of formation of oxide layers. It is also found temperature has a predominant effect on corrosion process in contrast of humidity. © 2022 IEEE.

关键词： Capacitance

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A Novel High Torque Density Spoke-Array Permanent Magnets Vernier Machine with Magnets Bridge

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IEEE Transactions on Industry Applications 2025年

作者： Zhang, Yuwei Zhao, Yu Li, Dawei Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

In recent years, permanent magnet vernier machine (PMVM) has drawn more attention due to their high torque density. To further improve torque capability, Spoke-array (SA) PM having better flux focusing effect are applied. However, SAPMVM suffers from a considerable torque reduction due to the deteriorated low order working flux harmonics caused by flux barrier effect. Especially, the higher pole ratio (PR), i.e., the ratio of PM pole-pair to armature pole-pair, the severer torque drop of SAPMVM. In this paper, a novel SAPMVM is proposed, where the magnets bridge is introduced, which can effectively restrict the flux barrier effect. As a result, both the working flux harmonics and torque density of SAPMVM are enhanced. To analyze the operating principle of proposed SAPMVM with magnets bridge, an equivalent magnet circuit model is established. Moreover, the electromagnetic performances of the proposed SAPMVM are compared with regular SAPMVM by FEA, where the torque of proposed SAPMVM has increased by 43.3% and 175.6% under rated-load when the PR is selected as 5 and 11. © 1972-2012 IEEE.

关键词： Permanent magnets

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Minimum Current Optimization of DBSRC Considering Dead-time Effect

Minimum Current Optimization of DBSRC Considering Dead-time ...

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2022 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2022

作者： Yang, Jiawen Zhang, Yu Wu, Xinmi Huazhong University of Science and Technology State Key of Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (数字)9781665492065

ISBN: (纸本)9781665492065

In the dual-bridge series resonant converter (DBSRC) working at a high switching frequency, the dead-time effect becomes a serious issue. When the minimum current trajectory (MCT) method is applied, the inductor current cannot be minimized due to the dead-time effect, and the range of the soft switching is reduced. Considering the dead-time, this paper firstly performs a theoretical analysis of the transmission power and soft-switching characteristics based on the fundamental harmonic approximation (FHA) approach. Then, a minimum current trajectory method considering dead-time (MCT-d) is proposed to achieve minimum inductor current by compensating the dead-time. Meanwhile, the method can extend the soft-switching range as well. Finally, the experimental results validate the theoretical analysis and the improvement of the converter efficiency. © 2022 IEEE.

关键词： Zero voltage switching

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Dielectric Mechanism and Spectrum Prediction Model for Insulating Paper Based on Three-Dimensional Frequency-Domain Spectroscopy

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IEEE Transactions on Dielectrics and Electrical Insulation 2025年

作者： Liu, Ruiqi Wang, Shengkang Lin, Fuchang Li, Hua Ministry of Education State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

Moisture is a serious concern for transformers, as it will degrade insulation properties and accelerate aging. The dielectric mechanisms of oil-immersed paper (OIP) and the influence of moisture still remains contentious in existing studies, which prevents the application of Frequency-Domain Spectroscopy (FDS) technology in moisture assessment of transformers. OIP is a biphasic composite material composed of oil and paper, and the existence of oil would complicate the understanding of the dielectric mechanisms in solid insulation. Therefore, this study focuses on investigating the dielectric properties of non-immersed insulating paper using FDS. Firstly, the spectra of paper with different moisture content were analyzed, and the relationship between dielectric parameters and moisture was quantified through the proposed dielectric model of insulating paper. Then, a three-dimensional dielectric model for spectrum prediction was established, and the feasibility and universality of model was verified. Results show three distinct dielectric response processes in insulating papers: the hopping conduction (RI), the low-frequency relaxation polarization (RII), and the high-frequency relaxation polarization (RIII). With increasing moisture content, RI and RII processes shift synchronously and exponentially towards higher frequencies with the dielectric curve shape maintained, while RIII process is unaffected. Moreover, the proposed spectrum prediction model can accurately predict the spectrum of insulating paper with varying moisture content. The dielectric response mechanism and three-dimensional dielectric model of insulating paper identified in this study provide the theoretical basis and data support for subsequent studies of the dielectric mechanism and moisture assessment of oil-immersed paper. © 1994-2012 IEEE.

关键词： Frequency domain analysis

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Synthesis of a novel Al foam with a periodic architecture by introducing hollow Al tubes and Al/Mg powders

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Journal of Materials Science & technology 2023年第17期148卷 105-115页

作者： Zhigang Xu Dayong Shen Kai Wang Peng He Jian Zhang Hao Zhang Peng Cao Shangyu Huang Jian Peng Qiang Shen Chuanbin Wang Lianmeng Zhang Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Wuhan Second Ship Design and Research Institute Wuhan 430205China Department of Chemical and Materials Engineering University of AucklandPrivate Bag 92019Auckland 1142New Zealand

In this work,we synthesized a brand-new Al foam with a periodic structure via a simple powder metallurgical *** periodic architecture consists of both hierarchical porous and bi-directional composition-graded *** results show that the hierarchical porous material includes large pores on millimeter scale inheriting from the hollow structure of the Al tubes,and small pores on mi-crometer scale produced by the sintering of Al/Mg *** bi-directional Mg concentration-graded structure is formed in the tube walls due to the condensation of Mg vapor in the inner tube *** addition of Mg powders achieves excellent metallurgical bonding between the Al powders and the hollow tubes at 550℃.The plateau stress and energy absorption capacity of the Al foam in y-axis compression are significantly higher than that in the x-axis due to their anisotropic *** general,the Al foam with Mg addition presents the most superior compression performance,and we believe that our find-ings could open up a unique strategy for developing high-performance metallic foams with the periodic architecture involving both hierarchical porous and bi-directional graded structure.

关键词： Al foam Hollow Al tube Mg evaporation Bi-directional composition-graded structure Compression properties Energy absorbing performance

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Small Disturbance Relationship with Internal-Voltage Amplitude/Frequency Excitation and Active/reactive Current Response and Its Linearization Method of AC Network for AC Power System Dynamic Analysis 4

Small Disturbance Relationship with Internal-Voltage Amplitu...

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4th International Conference on Electrical engineering and Control Technologies, CEECT 2022

作者： Wang, Sicheng Yuan, Xiaoming School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781665498999

With the high penetration of renewable generations, increasingly serious impact of dynamics of AC network as an important part of power systems on system dynamic behaviors urgently asks for constructing corresponding small disturbance linearization relationship of AC network to achieve dynamic analysis for today's new system by applying mature linear system mathematics. However, due to the existence of AC signals in the network, relevant DC state variables and operating points required for establishing and linearizing small disturbance relationship are not intuitive. But existing researches almost have not yet understood appropriate state variables and operating points from the perspective of AC power systems' basic operation principle and physical connotation of system dynamics, causing there is still a lack of a universal construction idea and a general linearization method of the small disturbance relationship of AC network suitable for system dynamic analysis. Thus, system operation principle and physical dynamics are first concerned by taking a simplified converter interfaced power system as an example in this paper, and internal-voltage amplitude/frequency (A/F) and active/reactive (A/R) current are revealed as state variables and operating points of AC power systems. A universal construction idea of small disturbance relationship with internal-voltage A/F excitation and A/R current response of AC network and relevant linearization method are then proposed. Finally, small disturbance linearization relationship of a typical inductive transmission line is established and is validated by simulation. © 2022 IEEE.

关键词： Linearization

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Polymeric ultralong organic phosphorescence with excellent humidity and temperature resistance via hydrophobic effect

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Aggregate 2024年第2期5卷 222-228页

作者： Zhongyu Li Kexin Fu Huangjun Deng Kaixuan Nie Zhe Pan Zhu Mao Juan Zhao Gang Li Pengli Zhu Zhenguo Chi Rong Sun National Key Laboratory of Materials for Integrated Circuits Shenzhen Institute of Advanced Electronic MaterialsShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenChina PCFM Lab GDHPPC LabGuangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional FilmsState Key Laboratory of OEMTSchool of ChemistrySun Yat-sen UniversityGuangzhouChina State Key Laboratory of Optoelectronic Material and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhouChina

Polymeric ultralong organic phosphorescence(UOP)with persistent emission is of great importance in practical ***,achieving good water-resistance for long-term environmental stability is a formidable *** this contribution,through tailoring the alkyl-chain length of the hardeners and emitters,polymeric UOPs with varying crosslinking density and hydrophobic effect were ***,all the polymers show no obvious decrease in UOP emission after high temperature-humidity test(85℃/85%relative humidity for 7 days).Detailed investigations demonstrate that the rigid covalent crosslinking networks suppress the quenching of triplet excitons while the hydrophobic microenvironment affords good water/moisture-resistance ***,the polymers with superior processability are successfully applied as optical coatings,prepreg,and afterglow *** this work,we provide a new strategy to promote the long-term stability of polymeric UOP materials in high-temperature-humidity conditions.

关键词： aqueous environment hydrophobic effect long-term stability polymeric phosphorescence room temperature phosphorescence

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