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8th International Conference on Power and Renewable Energy, ICPRE 2023

作者： Yang, Xiaojuan Lou, Suhua Zhao, Yuanyuan Bai, Chongtao Huang, Ting Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan430074 China State Grid Fujian Electric Power Research Institute Fuzhou350007 China

ISBN: (纸本)9798350328813

Under the background of carbon peaking, carbon neutrality and integrated development of transportation and energy, and in view of the current situation of high emission and high energy consumption in expressway service area (ESA), an optimization operation model of integrated energy system (IES) including gas turbine, wind, photovoltaic, energy storage system and hydrogen is established with the lowest system operation cost and energy purchase cost as the objective function, which introduces power to gas and fuel cell to achieve bidirectional coupling of electricity and hydrogen. Then this paper takes a large expressway service area in the northwest of China as an example and sets different scenarios for example analysis. The simulation results show that the total operation cost of the system is greatly reduced and the utilization rate of renewable energy is effectively increased, which indicate that the proposed model can improve the system operation economy, green and low carbon development, and diverse interactivity while meeting the energy requirements of electricity and hydrogen in expressway service area. It has significant application value in promoting sustainable development in the fields of transportation, energy and power. © 2023 IEEE.

关键词： expressway service area integrated energy system optimization operation model power to gas

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Cooperative Optimisation of Hybrid Energy Storage System in Multi-Microgrids

SSRN

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SSRN 2024年

作者： Ni, Kang Chen, Changsong Chao, Zeyun Cui, Bowen Gan, Lin State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

Hybrid energy storage system (HESS) composed of battery and supercapacitor (SC) can realise the complementary advantages of the both, and has been widely used and concerned in multi-microgrids (MMGs). Aiming at the contradiction between capacity configuration and economic dispatch of HESS in MMGs, this paper proposes a cooperative optimisation method considering energy interaction within MMGs and battery grouping. The method fully takes into account the synergistic interaction between capacity configuration and economic dispatch of HESS, and improved particle swarm optimisation (IPSO) algorithm is utilized to deal with the cooperative optimisation model to minimise the total cost of MMGs. Finally, the effectiveness of the method proposed in this paper is verified by case studies, and the effects of battery grouping and energy interaction within MMGs on the capacity configuration of HESS and the total cost of MMGs are explored. The results show that the proposed cooperative optimisation method is beneficial to lower the total cost and ameliorate the economics of MMGs. © 2024, The Authors. All rights reserved.

关键词： Particle swarm optimization (PSO)

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Influence of electromagnetic Launch Rail Structure on Current Distribution 16th

Influence of Electromagnetic Launch Rail Structure on Curren...

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16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： Ge, Yifan Qin, Shihong Chen, Lixue Wuhan Institute of Technology Wuhan430200 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)9789811918698

In order to explore the influence law of rail Structural parameters on current distribution, a two-dimensional dynamic finite element model of railgun is established, and the electromagnetic thermal tight coupling rail current and temperature distribution under different rail shapes and corresponding size parameters are analyzed. The results show that reducing the spacing and height of the rectangular rail can improve the current density of inner surface of the rail, and changing the rail width has no effect on the current density distribution. Through the chamfering and the appropriate selection of the inner and outer half axis size of the elliptical rail, the current concentration phenomenon can be suppressed, rail current distribution characteristics can be improved, and the heat distribution of the rail can be optimized, which provides a reference for the size optimization design of the rail. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Electric current distribution measurement

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Data-Augmentation Acceleration Framework by Graph Neural Network for Near-Optimal Unit Commitment

SSRN

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SSRN 2024年

作者： Wei, Lishen Ai, Xiaomeng Fang, Jiakun Cui, Shichang Gao, Liqian Li, Kun Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

The acceleration of large-scale unit commitment (UC) problems has been a long-standing challenge in the power industry. Given the difficulty of obtaining the optimal solution, the Independent System Operators (ISOs) usually prioritize the near-optimal solution achieved within a short timeframe in practical applications. In this paper, to obtain near-optimal commitments rapidly, we develop a data-augmentation acceleration framework by neural network. First, a data augmentation technique is developed to enrich the training dataset with numerous near-optimal solutions instead of just incorporating the optimal one. Secondly, we employ the graph neural network (GNN) to learn the commitments, where the UC problems are treated as graphs to represent the relationship between variables and constraints. Last, a repair method is introduced to address potential inaccuracies caused by GNN, converting infeasible or suboptimal solutions into near-optimal ones. The proposed framework was validated on the RTS-GMLC and practical Jiangsu Province systems. Numerical experiments with the Gurobi solver demonstrated a remarkable acceleration in finding near-optimal solutions, achieving speed-ups of 10.7x and 15.9x, respectively. The quickly obtained near-optimal solutions also greatly aid in finding optimal solutions. Furthermore, integrating the proposed framework into the open-source solver significantly outperformed the Gurobi solver in finding near-optimal commitments. © 2024, The Authors. All rights reserved.

关键词： Optimal systems

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Multi-objective capacity planning for expressway microgrid considering photovoltaic panel dust removal maintenance 2

Multi-objective capacity planning for expressway microgrid c...

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2023 2nd International Conference on Smart Energy and Energy Internet of Things, SEEIoT 2023

作者： Liao, Guangrong Yang, Xiaojuan Lou, Suhua Qin, Weijie Liu, Jin Hong, Xuanjiao Gezhouba Group Transportation Investment Co. Ltd. Hubei Province Wuhan430030 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Province Wuhan430074 China

The increasing passenger volume and the rapid development of the electric vehicle industry make the electricity consumption of the expressway service area grow day by day. It is of great significance to study the planning and design method of the microgrid in the expressway service area. This paper established a wind-photovoltaic-storage capacity planning model for the microgrid in expressway service areas, which considered the dust removal maintenance of photovoltaic panels. The multi-objective optimization problem was solved by the improved fast non-dominated sorted genetic algorithm (NSGA II) with the aim of minimizing the total system investment, and operating cost and maximizing the self-consistent rate of electricity consumption of the microgrid. The Pareto optimal solution frontier with uniform distribution and wide range is obtained, and the capacities of PV, wind power, energy storage, and contact line are obtained under different self-consistent rates of electricity consumption. This method can not only make full use of distributed PV resources that can be developed on the expressway to improve the self-consistent level of energy but also comprehensively evaluate the economy of the microgrid system and meet the requirements of power supply reliability. © 2023 Institute of Physics Publishing. All rights reserved.

关键词： Investments

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A Fast Transient Current Control Strategy for Three-Phase Dual-Active Bridge Converter

A Fast Transient Current Control Strategy for Three-Phase Du...

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Energy Storage and Conversion (ISESC), CPSS & IEEE International Symposium on

作者： Mengyuan Zhao Yu Zhang State Key Laboratory of Advanced Electromagnetic School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350380514

ISBN: (纸本)9798350380521

The three-phase dual-active bridge converter (3pDAB) is becoming a promising topology due to the advantages of higher power density and efficiency. Under phase-shift (PS) modulation, the phase-shift angle will have a significant step change when the transmission power is quickly adjusted, which will cause serious transient oscillation of the inductance current and pose a risk to the safety of the converter. Focusing on the widely utilized single phase-shift (SPS) modulation, this paper examines the transient process of 3pDAB resulting from variations in the phase-shift angle. Then, by temporarily adjusting the external phase-shift angle, a fast transient current control strategy (FTCC) is proposed to mitigate oscillations, effectively managing the transient process within one-third of a switching cycle and facilitating smooth transmission power adjustments. Furthermore, the impact and oscillation of inductance current during transient process are significantly reduced. Finally, the performance of the control strategy was verified.

关键词： Current control Power system measurements Inductance Phase modulation Process control Focusing Switches Switched reluctance motors Transient analysis Oscillators

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FAST VERIFICATION OF REMOTE BACKUP CAPABILITY OF TRANSMISSION LINE PHASE-TO-PHASE DISTANCE PROTECTION BASED ON IMPEDANCE MATRIX 18

FAST VERIFICATION OF REMOTE BACKUP CAPABILITY OF TRANSMISSIO...

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18th International Conference on AC and DC Power Transmission, ACDC 2022

作者： Ding, Xiaobing Gao, Yukun Chen, Zhaohui Tian, Deliang Li, Jie He, Jinfeng Li, Yinhong Chen, Jinfu China Southern Power Grid Company Limited Guangzhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9781839537615

ISBN: (纸本)9781839537615

The loss of secondary dc power in a substation will disable all protections, making them fail to trip when faults occur on power equipments. The remote backup capability of protections deployed in the upstream stations will become a crucial issue for the secure operation of power grids. In this paper, an impedance matrix-based method to efficiently verify the remote backup capability of phase-to-phase distance protection is proposed. The measuring impedance formula of the protection based on the impedance matrix is deduced. An analytical equation is established through combining the formula with the setting value of the protection. The remote backup capability is fast verified according to the characteristics of the equation solutions. The effectiveness of the method is demonstrated through case studies of a typical 500 kV substation. © ACDC 2022. All rights reserved.

关键词： Electric impedance measurement

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Modulation Strategy for 2-SiC Hybrid Devices ANPC-DAB Converter Through Dual-Path Zero-state

Modulation Strategy for 2-SiC Hybrid Devices ANPC-DAB Conver...

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International Conference on Power Electronics and Motion Control (IPEMC)

作者： Mengyuan Zhao Yu Zhang Yangfan Chen Zhuolan Li State Key Laboratory of Advanced Electromagnetic School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

The active-neutral-point-clamped three-level dual active bridge (ANPC-DAB) converter is a prominent topology for medium voltage applications. To realize high cost-efficiency, the hybrid utilization of Si and SiC devices has been an attractive approach. In this paper, a 2-SiC hybrid devices ANPC-DAB converter is studied, which optimally utilizes both Si IGBTs and SiC MOSFETs to achieve the tradeoff between performance and cost. A modulation strategy through dual-path zero-state (DPZS) is proposed to achieve zero-voltage switching (ZVS) turn-on of all switches when combining proper current conditions and optimally balance the switching losses among the switches. Meanwhile, the presented method achieves small dead zones and short commutation loops during switching process. Finally, the experimental results are given to verify the effectiveness of the modulation strategy.

关键词： Silicon carbide Modulation Bridge circuits Switching loss Switches Zero voltage switching Silicon

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Coupling Analysis of Transient electromagnetic Field and Temperature Field in electromagnetic Launch Rail 1

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16th Annual Conference of China Electrotechnical Society, ACCES 2021

ISBN: (数字)9789811918704

ISBN: (纸本)9789811918698

In the launching process of railgun, the performance degradation caused by local overheating will seriously affect the life of electromagnetic launch rail and launching efficiency. In this paper, a two-dimensional dynamic finite element model of railgun is established to analyze the distribution of rail current and temperature under different driving current and continuous firing frequency. The results show that during the launching process, the current is concentrated on the inner edge of the rail, and the penetration depth is about 1–2 mm. The highest temperature of the rail appears near the end of the current rising edge, and the temperature near the gun tail is higher. Under the case of continuous emission, the change of material properties caused by temperature rise has a great influence on the results. In this paper, the electromagnetic thermal coupling calculation method is used, which can provide a reference for the optimal design of the rail. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Rail guns

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Degradation Mechanism of SiC MOSFET Module with Double Side Cooling for Electric Vehicle in Accelerated Aging Test

Degradation Mechanism of SiC MOSFET Module with Double Side ...

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2022 International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, PCIM Asia 2022

作者： Han, Lubin Liang, Lin Kang, Yong Liu, Xudan He, Maojun State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan China Investment Ltd. Shanghai China

ISBN: (纸本)9783800759125

To investigate the role of packaging degradation and chip degradation of SiC MOSFET module with double side cooling (DSC), the customized DSC modules are aged by power cycling test for modelling the practical conditions. The parasitic resistance and thermal resistance are monitored as the indicator of health condition. The test results show that the gate of samples with defective sinter layers is damaged by high compressive stress, resulting in the shorter lifetime. Even though the lifetime of samples with healthy sinter layers is about 4~22 times than that of defective modules, the failure mode of them is VTH drift, rather than the sinter degradation. © VDE VERLAG GMBH · Berlin · Offenbach.

关键词： Silicon carbide

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