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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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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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Optimal Voyage Scheduling of Battery-Swapping Based Inland All-Electric Ship Fleet Considering Environmental Factors and Time-of-Use Electricity Price

Optimal Voyage Scheduling of Battery-Swapping Based Inland A...

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Power and Electrical engineering (ACPEE), 5th Asia Conference on

作者： Shenglong Yang Fan Ma Haishun Sun Lin Sun State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology) National Key Laboratory of Electromagnetic Energy (Naval University of Engineering) Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China National Key Laboratory of Electromagnetic Energy Naval University of Engineering Wuhan China

ISBN: (数字)9798350309638

ISBN: (纸本)9798350309645

Inland all-electric ship is receiving more and more attention due to its advantages in terms of low carbon, energy conservation, and flexibility in operation mode. However, its extensive promotion and application are held back by various problems such as long charging time, high cost of energy supplement, environmental factors, etc. In addition, the complexity of the electric ship fleet also poses a challenge to its optimal operation. Hence, an optimal voyage scheduling model of the inland all-electric ship fleet, with departure time and speed of each ship as the decision variables, is firstly established to minimize the total battery-swapping cost and the total waiting time in this paper. Based on the battery-swapping mode, the model takes environmental factors and time-of-use electricity prices into account. Second, adaptive particle swarm optimization is used to solve the proposed model, and the comparative analysis is made. Finally, an all-electric ship fleet operating in the Yangtze River is selected as a study case, and the simulation results show that the proposed model can effectively reduce the total battery-swapping cost and the total waiting time.

关键词： Adaptation models Costs Electricity Simulation Environmental factors Rivers Power systems

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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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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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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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Characteristics of divertor heat flux distribution with an island divertor configuration on the J-TEXT tokamak

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Plasma Science and technology 2024年第12期26卷 9-17页

作者： Yutong YANG Yunfeng LIANG Wei YAN Shuangbao SHU Jiankun HUA Song ZHOU Qinghu YANG Jinlong GUO Ziyang JIN Wei XIE the J-TEXT Team State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Jülich 52425Germany School of Instrument Science and Opto-electronics Engineering Hefei University of TechnologyHefei 230009People’s Republic of China 不详

On J-TEXT,the temporal evolution of heat flux distribution on the high-field side(HFS)divertor plate has been measured by an infrared(IR)camera during the plasma operation with an island divertor *** experiments,the island divertor configuration is an edge magnetic island chain structure surrounded by stochastic layers,which can be induced by resonant magnetic perturbations(RMPs).The experimental results show that the heat flux distribution on the HFS target plate depends significantly on the edge magnetic ***,the impact of hydrogen fueling using supersonic molecular beam injection(SMBI)on the divertor heat flux distributions is studied on J-TEXT with an island divertor *** has been observed that power detachment can be achieved when the radiation front approaches the last closed flux surface(LCFS)after each SMBI *** result may provide a method of access for divertor detachment on a fusion device with a three-dimensional(3D)boundary magnetic structure.

关键词： infrared camera island divertor heat flux SMBI power detachment

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Mechanism Analysis of Subsequent Commutation Failure Considering PLL Dynamics in LCC-HVDC Systems 5

Mechanism Analysis of Subsequent Commutation Failure Conside...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Ban, Minghui Zhan, Meng Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

This paper analyzes the reasons of subsequent commutation failure (SCF) of line commutated converter based high voltage direct current (LCC-HVDC). Firstly, according to the mechanism of commutation failure (CF), it can be found that the actual firing angle, DC current and AC voltage of inverter all have influence on CF. Secondly, based on the generation mechanism of firing pulse in LCC-HVDC, it is pointed out that the phase locked loop (PLL) dynamics can cause the deviation between the actual firing angle and the firing angle order from control system. Then, the transient characteristics of PLL after the first commutation failure (FCF) are analyzed. Compared with other factors that affect SCF, the PLL dynamics in fault recovery period is considered as the main reason leading to SCF. Finally, a method to suppress SCF is proposed, and the effectiveness of the proposed conclusion and method is verified through the simulation of CIGRE benchmark model in PSCAD/EMTDC. © 2022 IEEE.

关键词： Dynamics

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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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Temperature Optimization for Efficient Power-to-Hydrogen Water Electrolysis

Temperature Optimization for Efficient Power-to-Hydrogen Wat...

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2023 IEEE Sustainable Power and Energy Conference, iSPEC 2023

作者： Chen, Ke Hu, Kewei Yang, Jie Chen, Feng Fang, Jiakun State Grid Hubei Electric Power Company Limited Economic Research Institute Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798350322699

This paper proposes an optimization model for temperature of water electrolyzers in pursuit of maximum power-to-hydrogen efficiency. Unlike the traditional operating strategy which controls constant temperature, the model aims at obtaining optimal temperature according to the variation of supplied current. In order to realize the maximum efficiency, the temperature-dependent electrochemical model of the electrolyzer, as well as the thermal model of the heater, is established. The optimal temperature occurs where the electrochemical loss and the thermal loss meet the balance. From the simulation results, the proposed model can acquire optimal temperature based on the supplied current, which can be applied to the scene of fluctuating power supply, e.g. wind and solar power. The test results show that up to 15% efficiency improvement can be achieved with the proposed temperature control method, compared with the traditional constant temperature control. © 2023 IEEE.

关键词： fluctuating power supply power-to-hydrogen efficiency temperature optimization water electrolyzers wind and solar power

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