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

作者： Ding, Zehuan Gan, Chun Shi, Haochen Ni, Kai Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350317589

This paper proposes a modular auxiliary resonant commutated pole (MARCP) inverter. The MARCP inverter eliminates the need for a connection to the DC bus or midpoint potential and has the same resonant branch for each phase, which enables its modular combination with any phase of inverters. During the operation of the proposed MARCP inverter, resonant currents are constructed in the commutation front through the voltage difference between the three bridge arms, which makes all the bridge arms resonantly commutated at the commutation-aligned moment. After commutation, resonant currents feedback to the power source. All the switches of the MARCP inverter can achieve soft-switching or pseudosoft-switching during the full switching period. In this paper, the effectiveness of the proposed topology and control method is verified by simulation. Compared with the auxiliary resonant commutated pole (ARCP) inverter, the MARCP inverter eliminates the coupling inductor or voltage dividing capacitor, which reduces the device requirement and size of the inverter. Furthermore, the main circuit and resonant circuit of the MARCP inverter are independent of each other, which is convenient for repairing and converting the hard-switching to soft-switching. © 2023 IEEE.

关键词： Pulse width modulation

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Heat Transfer Simulation and Analysis of Electron Collector Based on Real-time Uniformity Detection Device of Irradiation Accelerator 2

Heat Transfer Simulation and Analysis of Electron Collector ...

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2022 2nd International Conference on Energy, Power and Electrical engineering, EPEE 2022

作者： Zhang, Gefei Yuan, Jushigang Pang, Shiqiang Huang, Jiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Beam scanning uniformity is an important parameter of electron irradiation accelerators, which affects the quality of irradiated products. Accurate measurements of beam scanning uniformity are required to evaluate accelerator performance. Currently, a set of devices is being developed to measure beam scanning uniformity under full beam conditions. However, the measurement device faces serious heating problems when the beam power is large. In this paper, the cooling structure of the electron collector is designed for the developed measurement device. The temperature distribution of the electron collector is simulated by ANSYS. The appropriate cooling flow rates are selected to ensure the thermal stability of the device when the total beam powers are 30 kW and 50 kW, respectively. The electron collector with a cooling structure is fabricated according to design parameters, and the experiment is carried out under a 1.5 MeV accelerator. The temperature is monitored by an infrared thermometer. The results show that the measured temperature is below the limit. The designed cooling parameters effectively solve the heating problem. © Published under licence by IOP Publishing Ltd.

关键词： Cooling

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Magnetic Field Effects on Water Electrolysis Performance on a Microfluidic Platform

Magnetic Field Effects on Water Electrolysis Performance on ...

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2023 IEEE Sustainable Power and Energy Conference, iSPEC 2023

作者： Li, Hao Lu, Ang Dong, Tianshu Huang, Danji Song, Chaolong Wen, Jinyu Fang, Jiakun Pan, Yuan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798350322699

With the rapid development of global low-carbon energy, water electrolysis for hydrogen production attracts significant attention as a crucial energy conversion method. For industrial electrolysis setups, the large-scale application is limited by the issue of low efficiency. To address this issue, one promising approach is to regulate the electrolysis process by imposing an external magnetic field. However, current relevant studies usually focus on static electrolysis systems within beaker-like containers, ignoring the narrow flow channel structure and the circulating flow of electrolyte in industrial electrolyzers. Therefore, an electrolyzer using a microfluidic platform as a phantom is established. Based on the platform, this paper investigates the effects of magnetic field under different magnetic flux densities, electrolysis voltages and electrolyte flow rates. The results indicate that the magnetic field contributes to an enhancement in current density and the increase in current density shows a trend of first increasing and then decreasing with the increase of voltage or flow rate within a certain range. Moreover, The improvement increases with the increment in magnetic flux density. © 2023 IEEE.

关键词： Hydrogen Magnetic field Microfluidic system Water electrolysis

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Scenario Generation of Renewable Energy Based on Improved Diffusion Model

Scenario Generation of Renewable Energy Based on Improved Di...

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2023 IEEE Sustainable Power and Energy Conference, iSPEC 2023

作者： Li, Sheng Xu, Chuanyu Wei, Lishen Li, Ruijie Ai, Xiaomeng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798350322699

The large-scale integration of renewable energy into the power system has resulted in increased complexity of its uncertainty. This complexity arises from the rapidly increased renewable energy sites and the intricate spatial-temporal correlations involved. To offer a more precise description of the uncertainty of renewable energy, a scenario generation method based on an improved diffusion model is proposed. This approach can autonomously learn the probability distribution and spatiotemporal correlation of the training data. It utilizes a U-Net model to progressively denoise noise and iteratively generate renewable energy scenarios. Experiments using historical power data from five wind farms and five PV plants in Jiangsu Province show that the training process of the proposed method is more stable compared to existing methods. Moreover, the proposed method achieves higher accuracy in fitting probability distribution and captures the spatial correlation between multiple sites more accurately. © 2023 IEEE.

关键词： diffusion Model renewable energy scenario generation unsupervised learning

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Research on Voltage Stabilizing System of Switched Reluctance Motor Based on Fuzzy PID Control 27

Research on Voltage Stabilizing System of Switched Reluctanc...

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27th International Conference on Electrical Machines and Systems, ICEMS 2024

作者： Chang, Tong Wang, Shuanghong Li, Zixin School of Electrical and Electronic Engineering Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9784886864406

This paper proposes a control strategy based on fuzzy PID control of Switched Reluctance Motor Generator (SRMG) in response to the voltage fluctuation issues caused by load variations in switched reluctance motor system. This strategy is constructed based on the fundamental principles of closed-loop control and fuzzy control theory, incorporating a parameter-adaptive fuzzy PID controller and system model. Initially, a switched reluctance motor system was constructed to obtain voltage fluctuation data. Subsequently, aiming for voltage stabilization, a control algorithm for SRMG under constant speed mode was designed using the fuzzy PID controller, adopting a dual closed-loop control strategy for speed and current. Finally, compared with conventional PID control, the fuzzy PID controller was shown to effectively improve response speed, reduce voltage overshoot, and decrease voltage fluctuation time, demonstrating superior voltage stabilization performance. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Three term control systems

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Modified APC Strategy for Doubly Salient Electro-Magnetic Generator with Controlled Rectifier Considering Dramatic Load Changes 8

Modified APC Strategy for Doubly Salient Electro-Magnetic Ge...

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

作者： Lei, Zhenyu Wang, Shuanghong Li, Zixin Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350328813

The output voltage of the traditional diode-rectified doubly salient electro-magnetic generator (DSEG) system will change significantly when the load current changes rapidly. Besides, it's difficult to regulate the output voltage by adjusting the field current because of the large time constant. In order to solve the problem, a modified angular position control (APC) strategy based on the controllable rectifier DSEG system is proposed. Using the back propagation neural network (BPNN) to predict proper switching angles according to the speed and field current, the improved APC strategy is helpful to slow down the charge and discharge process of the capacitor and greatly reduced the output voltage fluctuation. Finally, the effectiveness of the proposed strategy is proved by simulations on a 6/4 pole DSEG with controlled rectifier. © 2023 IEEE.

关键词： APC BPNN controlled rectifier DSEG voltage control strategy

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Signature Identification of False Data Injection Attacks Based on Deep Vision Networks

Signature Identification of False Data Injection Attacks Bas...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： He, Yixuan Wang, Jingyu Shi, Dongyuan School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

The increasing integration of cyber-physical systems has markedly amplified the vulnerability of power systems to False Data Injection Attacks (FDIAs), posing significant threats to their security and reliability. FDIAs can emulate various power system dynamics, each with distinct objectives, potentially leading to incorrect decisions by operators or causing damage that may go undetected initially. The impact of these attacks often hinges on their specific signatures, which reflect the temporal characteristics of the injected data waveforms. Therefore, precise classification of these attack signatures is essential for predicting their potential effects and devising effective countermeasures. This paper addresses this challenge by proposing the use of the VGG16 network, a deep learning model commonly utilized in computer vision, to classify the attack signatures. Leveraging VGG16's ability to identify complex patterns in data, the pro-posed method offers a robust solution for distinguishing between different types of FDIAs. Experimental validation on the IEEE 39-bus system confirms the effectiveness of this approach in improving the detection and classification of FDIAs. © 2024 IEEE.

关键词： Cyber attacks

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A Stability-Oriented Current Scheme for a Wind Farm Connected to a MMC-HVDC under Severe Faults 8

A Stability-Oriented Current Scheme for a Wind Farm Connecte...

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8th Asia Conference on Power and Electrical engineering, ACPEE 2023

作者： Li, Fuqi Lin, Lei Shi, Xiaojie Li, Yingbiao Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350345520

The offshore wind farm connected modular multilevel converter (MMC)-based high-voltage direct-current (HVDC) transmission system is prone to lose transient synchronization stability under AC faults. The multi-wind turbine (WT) interaction can cause a great deal WTs to lose stability in quick succession. Moreover, the multiple WTs further interact with the control of MMC, making the system stability analysis complicated. In order to guarantee a reliable operation of the system, based on equal area criterion (EAC), this paper exhaustively analyzes the stability problem of such offshore wind farm. The investigated wind farm is made up of full-scale type-4 wind turbines (WTs). It is found that the injected current distribution of MMC and WT are especially predominant in such two interactions. Based on above analysis, a stability-oriented current scheme is proposed to minimize the adverse effect of interactions, enhancing the synchronization stability. Finally, above theoretical analysis and effectiveness of the proposed current scheme are verified by MATLAB/Simulink simulation results. © 2023 IEEE.

关键词： Phase locked loops

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Interaction Quantification of MTDC Systems Connected with Weak AC Grids

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CSEE Journal of Power and Energy Systems 2024年第5期10卷 2088-2099页

作者： Wanning Zheng Jiabing Hu Li Chai Bing Liu Zixia Sang Engineering Research Center of Metallurgical Automation and Measurement Technology Wuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China College of Control Science and Engineering Zhejiang UniversityHangzhou 310027China State Grid Hubei Economic Research Institute Wuhan 430077China

The small-signal stability of multi-terminal high voltage direct current(HVDC)systems has become one of the vital issues in modern power *** among voltage source converters(VSCs)have a significant impact on the stability of the *** paper proposes an interaction quantification method based on the self-/en-stabilizing coefficients of the general N-terminal HVDC system with a weak AC network ***,we derive the explicit formulae of self-/en-stabilizing coefficients for any N-terminal HVDC system,which can quantify the interactions through different paths *** relation between the self-/en-stabilizing coefficients and the poles of the system can be used to evaluate the impact of the interactions on the system stability ***,we employ the obtained formulae to analyze the parameter sensitivity and explain how a parameter affects the stability of the system through different paths of ***,extensive examples are given to demonstrate the effectiveness of the proposed method.

关键词： Interactions multi-terminal HVDC self-/enstabilizing coefficients small-signal stability

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Dynamic Evolution of CS and Its Effects on Charged Particles in Vacuum Arc 7

Dynamic Evolution of CS and Its Effects on Charged Particles...

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7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Liu, Shan Yuan, Zhao Liu, Liming Chen, Lixue Ya, Penglong Pan, Yuan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350345094

CS emits plasma and metal vapor towards the arc gap, which influences the interruption of VCB. In order to analyze the dynamic evolution of CS and its effect on charged particles, the observation experiments of CS and charged particles were carried out. Using cup-shaped electrode of AMF, the dynamic pictures of CS in the diffusion is shot by high-speed camera, and the distribution of CS is observed. The CS is identify by Matlab software, and the diameter, diffusion rate and quantity of the CS are obtained. The dynamic evolution of them with different breaking conditions is analyzed. The characteristic parameters of charged particles were diagnosed by colorimetric method. The 2D spatial distribution was obtained. The results indicate that the change of the quantity of CS with time is consistent with that of current waveform. The rise in the quantity of CS is related to the diffusion and split of the spots. It is observed that the evolution of CS on the electrode is not completely uniform. At the more radial outward position of the electrodes, the distance between CS is greater. The diameter and diffusion rate of CS are not constant. It is observed that charged particles density decays and fluctuates radially, and the temperature increases along the radial direction. This is related to the evolution of CS. © 2023 IEEE.

关键词： High speed cameras

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