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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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Post-Disaster Scheduling Strategy of Island Microgrid with Electric Passenger Ships 4

Post-Disaster Scheduling Strategy of Island Microgrid with E...

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4th International Conference on Power and Energy technology, ICPET 2022

作者： Wu, Chuantao Ma, Yuncong Chen, Cen Sun, Chengcheng Lin, Xiangning Wei, Fanrong Li, Zhengtian Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Wuhan430074 China

ISBN: (数字)9781665480796

ISBN: (纸本)9781665480796

Island microgrids (IMGs) are usually interconnected with the mainland grid by submarine cables. However, once the submarine cable suffers damage, the IMGs will rely on standby diesel units to operate independently with the poor economy and severe pollution. This paper proposes a post-disaster collaborative scheduling strategy for IMG and electric passenger ships (EPS) to address this problem. Firstly, based on the idea of hierarchy-clustering-decoupling, a novel EPS scheduling model is proposed to speed up the solving efficiency. Then, a two-stage post-disaster scheduling strategy is presented with the operating constraints of IMGs. The first stage optimally determines the IMG scheduling plan and the EPS cluster scheduling plan, and the second stage makes decisions on individual EPS scheduling plans. Finally, the numerical simulation verifies the effectiveness of the proposed strategy and the rapidity of the solution. © 2022 IEEE.

关键词： Scheduling

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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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Multiphysics Modeling and Parameter Analysis of Industrial Power-to-Hydrogen Electrolyzers 6

Multiphysics Modeling and Parameter Analysis of Industrial P...

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6th International Conference on Energy, Electrical and Power engineering, CEEPE 2023

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

ISBN: (纸本)9798350348279

This paper proposes the multiphysics model of the industrial power-to-hydrogen electrolyzers. Based on the multi-energy flow in the industrial power-to-hydrogen electrolysis plant, the coupling among the multiphysics in the electrolyzer, including the electrochemical reaction, the flow field, the mass transfer and the temperature field, are unveiled. The governing equations and coupling mechanisms of the physical fields are introduced in detail, which are further illustrated according to the simulation results in COMSOL Multiphysics. Furthermore, several critical parameters, including the cell voltage, temperature and the concentration of the electrolyte, are analyzed based on the proposed model. Through the analysis on the current density- voltage characteristics, it can be concluded that the operating of the industrial electrolyzer usually faces the trade-off between the hydrogen production rate and the efficiency. The proposed model provides multiphysics explanations on the industrial statistics of the electrolyzer. © 2023 IEEE.

关键词： Multiphysics

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Low-Temperature Carbonized Nitrogen-Doped Hard Carbon Nanofiber Toward High-Performance Sodium-Ion Capacitors

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Energy & Environmental Materials 2023年第4期6卷 129-136页

作者： Congkai Sun Xiong Zhang Yabin An Chen Li Lei Wang Xiaohu Zhang Xianzhong Sun Kai Wang Haitao Zhang Yanwei Ma Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China School of Engineering Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Separation Membranes and Membrane Processes Tianjin Key Laboratory of Advanced Fibers and Energy StorageSchool of Material Science and EngineeringTiangong UniversityTianjin 300387China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu ZhongkeJinan 250013China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Carbon nanofiber(CNF)was widely utilized in the field of electrochemical energy storage due to its superiority of conductivity and ***,CNF was generally prepared at relatively high ***,nitrogen-doped hard carbon nanofibers(NHCNFs)were prepared by a lowtemperature carbonization treatment assisted with electrospinning *** functional theory analysis elucidates the incorporation of nitrogen heteroatoms with various chemical states into carbon matrix would significantly alter the total electronic configurations,leading to the robust adsorption and efficient diffusion of Na atoms on electrode *** obtained material carbonized at 600°C(NHCNF-600)presented a reversible specific capacity of 191.0 mAh g^(−1)and no capacity decay after 200 cycles at 1 A g^(−1).It was found that the sodium-intercalated degree had a correlation with the electrochemical impedance.A sodium-intercalated potential of 0.2 V was adopted to lower the electrochemical *** constructed sodium-ion capacitor with activated carbon cathode and presodiated NHCNF-600 anode can present an energy power density of 82.1 Wh kg^(−1)and a power density of 7.0 kW kg^(−1).

关键词： electrochemical presodiation low-temperature carbonization nitrogen-doped hard carbon nanofibers sodium-ion capacitors

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An Improved Valve-Side Fault-Riding-Through Control Strategy for Hybrid MMC

An Improved Valve-Side Fault-Riding-Through Control Strategy...

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2022 International Power Electronics Conference, IPEC-Himeji 2022-ECCE Asia

作者： Zhang, Jiawei Peng, Li Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9784886864253

The hybrid Modular Multilevel Converter (HMMC) with half half-bridge submodules (HBSMs) and half full-bridge submodules (FBSMs) has been widely studied in High-Voltage Direct Current (HVDC) transmission systems for its dc fault blocking capability. The valve-side single-phase-to-ground (SPG) fault cannot be handled well by the schemes proposed to handle the grid-side faults. There will be fundamental-frequency fluctuation of dc-bus pole-to-ground voltage and dc current, which may cause insulation breakdown and arm overcurrent. Therefore, an improved control strategy with adaptive arm voltage reference is proposed in this paper. A current controller is utilized to eliminate the fluctuation. In the meantime, dc voltage should reduce cooperatively to change the arm voltage reference so that the arm voltages will be shifted down to avoid arm overmodulation. Considering that HBSMs cannot generate negative level as FBSMs, the energy of HBSMs' capacitor is analyzed in detail to explore the range that the proposed scheme can handle. Simulation results confirm the effectiveness. © 2022 IEEJ-IAS.

关键词： Power converters

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Hierarchical NiFe LDH/N-doped Co/nickel foam as highly active oxygen evolution reaction electrode for anion exchange membrane water electrolysis

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Nano Research 2025年第2期18卷 280-289页

作者： Jiansheng Wang Yongsheng Wang Xiaoxuan Guo Mengting Chen Jinjie Fang Xiaojie Li Wei Zhu Zhongbin Zhuang State Key Lab of Organic-Inorganic Composites and Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Energy Environmental Catalysis Beijing University of Chemical TechnologyBeijing 100029China PetroChina Shenzhen New Energy Research Institute Co. Ltd.Shenzhen 518054China

Anion exchange membrane water electrolyzers(AEMWEs)are emerging as a promising technology due to the high performance and low ***,the development of highly active and stable non-precious metal-based catalysts for the anodic oxygen evolution reaction(OER)remains a great *** this study,we present a top-down construction strategy for anode design,resulting in a hierarchical NiFe layered double hydroxide(LDH)/N-doped Co/nickel foam(NF)electrode synthesized via a hydrothermal-gas phase nitridation–electrodeposition *** electrode features NiFe LDH nanoplates grown on N-doped Co nanowires supported by nickel foam *** NiFe LDH/N-doped Co/NF electrode demonstrates exceptional performance,achieving a current density of 100 mA·cm^(-2) at a low overpotential of 262 mV with minimal attenuation of just 7 mV NiFe LDH/N-doped Co/NF RuO_(2)/NF NiFe LDH/N-doped Co/NF after 100 h of *** assembled into an AEMWE,the system requires only 1.63 V to achieve a current density of 1 A·cm^(-2),surpassing the performance of most reported *** N-doped Co nanowires are shown to enhance both activity and stability by increasing the electrode’s surface area and reinforcing the catalyst–support interaction.

关键词： water electrolysis oxygen evolution reaction hierarchical structure synergistic effect

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Transient Stability Assessment and Dynamic Security Region in Power Electronics Dominated Power Systems 13

Transient Stability Assessment and Dynamic Security Region i...

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2022 IEEE International Conference on Power Systems technology, POWERCON 2022

作者： Ma, Rui Zhan, Meng School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665417754

ISBN: (纸本)9781665417754

Transient stability accidents induced by converter-based resources have been emerging frequently around the world. In this paper, the transient stability of the grid-tied voltage source converter (VSC) system is studied through estimating the basin of attraction (BOA) based on the hyperplane or hypersurface method. Meanwhile, fault critical clearing times are estimated, based on the approximated BOA and numerical fault trajectory. Further, the dynamic security region (DSR), an important index in traditional power systems, is extended to power-electronics-dominated power systems in this paper. The DSR of VSC is defined in the space composed of active current references. Based on the estimated BOA, the single-VSC-infinite-bus system is taken as an example and its DSR is evaluated. Finally, all these analytical results are well verified by several numerical simulations in MATlab/Simulink. © 2022 IEEE.

关键词： Power electronics

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In Situ Utilization of Martian Resources: Advances and Prospects in Plasma technology

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ACS Sustainable Chemistry & engineering 2025年第22期13卷 8406-8423页

作者： Haiwei Zhu Shihao Tan Cuntao Lan Dawei Liu Xinpei Lu State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 China

In situ resource utilization (ISRU) is essential for sustainable Mars exploration due to the high cost and complexity of Earth-based supply chains. Mars’ harsh environment─marked by a thin CO2-rich atmosphere, extreme temperature swings, dust storms, and high radiation─poses significant challenges for conventional processing. Plasma technologies, known for their high energy density, chemical reactivity, and operational flexibility, offer promising solutions. This review examines recent advances in nonthermal plasma systems for key ISRU tasks, including CO2decomposition for oxygen and fuel production, water extraction from hydrated minerals, and regolith sintering for habitat construction. Special attention is given to microwave and dielectric barrier discharge plasmas, which have shown enhanced oxygen yield and energy efficiency compared to traditional systems like NASA’s MOXIE. Spark plasma sintering is also highlighted for its potential in producing high-strength ceramics from Martian soil. Despite technical promise, deployment challenges remain, including thermal stress resistance, dust mitigation, and energy optimization. Strategies such as advanced material selection, self-cleaning surfaces, and integration with renewable energy are proposed to improve system resilience. Beyond Mars, these plasma technologies have strong potential for Earth-based applications including CO2valorization, decentralized water treatment, and low-energy waste recycling. By bridging extraterrestrial and terrestrial needs, plasma-driven ISRU represents a dual-use innovation platform for advancing sustainable engineering under extreme constraints.

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