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IEEE PES Asia-Pacific Power and Energy engineering Conference (APPEEC)

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

ISBN: (数字)9798350386127

ISBN: (纸本)9798350386134

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.

关键词： Costs Fluctuations Hydrogen Wind power generation Hybrid power systems State of charge Optimization Frequency control Energy storage Predictive control

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An Integrated Dual-mode Pulse-echo Ultrasonic Measurement System Under Pulsed/Static Magnetic Field

TechRxiv

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TechRxiv 2023年

作者： Qiu, Wenjie Zhang, Jian Luo, Yongkang Han, Xiaotao Wuhan National High Magnetic Field Center Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

Ultrasonic measurements at high magnetic field and low temperature necessitate ultra-fast excitations, ultra-high dynamic range of duty-cycle adjustments, as well as real-time, precise and automatic analysis. This paper proposes a dual-mode ultrasonic measurement system, which means the capability of carrying out acoustic measurements in both pulsed and static high magnetic field with low temperature. Based on the "counter-delay-chain" series structure and adaptive jitter compensation in the field-programmable-gate-array(FPGA), the timing control accuracy of 5 nanoseconds and the timing jitter below 160 picoseconds are realized for high-resolution excitation generation and precise sampling window adjustment. The duty cycle adjustment achieves a high dynamic range from 0.23 ppb to 10 % to realize both pulsed field mode and static field mode (denoted as PF-mode and SF-mode) ultrasonic measurements. The independent sampling window adjustment reduces the data size by more than 80%, extends the maximum testing duration and reduces the analysis consuming. Combined with the automatic cross-correlation analysis method, this system can automatically carry out PF-mode tests with a repetition rate above 100 kHz and SF-mode tests for hours with sound velocity accuracy of 2%. Experiments have proved the reliability and feasibility of the system and revealed its application prospect in condensed matter physics experiments. © 2023, CC BY-NC-SA.

关键词： Timing circuits

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Improved Active Disturbance Rejection Control for PMSM Based on Modified Extended State Observer

Improved Active Disturbance Rejection Control for PMSM Based...

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Smart Power & Internet Energy Systems (SPIES), International Conference on

作者： Xianxin Zhou Qiang Xu State Key Laboratory of Advanced Electromagnetic Engineering and Technology(School of Electrical and Electronic Engineering) Huazhong University of Science and Technology Wuhan China

Active disturbance rejection control (ADRC) is a new algorithm used in permanent magnet synchronous motor (PMSM) drive system which has a better tracking performance than proportional-integral (PI). Extended state observer (ESO) is the core part of ADRC which can estimate the total unknown disturbances and compensate for the influences in the closed- loop dynamics. The observation accuracy of ESO directly affects the compensation ability of the system. In order to promote the observation precision of ESO and improve the control performance of ADRC, a modified-structure ESO is proposed in this paper. Some simulation experiments are performed and the results indicate that the proposed controller can provide better speed dynamic and static performance under load disturbances.

关键词： Robust control Resistance Simulation Magnetic cores Observers Permanent magnet motors Load management

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Simulation and Design of Pulse Gas Injection in HFRC Device 4

Simulation and Design of Pulse Gas Injection in HFRC Device

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Li, Sheng Rao, Bo Yang, Yong Zhang, Ming Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics Wuhan430074 China

ISBN: (纸本)9781728171494

In FRC experimental studies, it is found that the parameters of the plasma formed after the collision merging greatly depend on the plasma parameters of the formation zone. The design and optimization of the pulsed gas injection device will help the ionization of neutral gas and thereby improving the plasma parameters of the formation zone. In this paper, studies are focused mainly on the change process of gas distribution of pulse gas injection stage, and design of the pulse gas injection device. The research takes the control of gas distribution as the goal and ANSYS FLUENT as a simulation platform to carry out the study. First, in this paper, we introduce several gas injection schemes that can be used in the pulse gas injection device, and ANSYS Fluent is used for simulation comparison. Through the analysis of simulation results, we have determined the most suitable scheme for gas injection. Then, we analyze in detail the axial and radial distribution of neutral gas at different time under the optimal scheme. And the results show the advantages of multi-valve gas injection. Finally, we predict the appropriate time duration of gas injection and ionization time when the pressure source is 2 × 10^5 Pa. © 2021 IEEE.

关键词： Gases

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Study of the fast electron behavior in electron cyclotron current driven plasma on J-TEXT

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Plasma Science and technology 2022年第6期24卷 45-52页

作者： Xiaobo ZHANG Wei YAN Zhongyong CHEN Jiangang FANG Junli ZHANG You LI Xixuan CHEN Yunong WEI Ruihai TONG Zhifang LIN Yu ZHONG Lingke MOU Feng LI Weikang ZHANG Lu WANG Donghui XIA Zhonghe JIANG Zhoujun YANG Nengchao WANG Zhipeng CHEN Yonghua DING Yunfeng LIANG Yan PAN the J-TEXT Team International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Southwestern Institute of Physics Chengdu 610041People's Republic of China School of Electrical Engineering&Automation Jiangsu Normal UniversityXuzhou 221116People's Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung—PlasmaphysikD-52425 JülichGermany

In J-TEXT tokamak,fast electron bremsstrahlung diagnostic with 9 chords equipped with multichannel analyzer enables detailed studies of the generation and transport of fast *** spatial profiles and energy spectrum of the fast electrons have been measured in two ECCD cases with either on-axis or off-axis injection,and the profiles processed by Abel-inversion are consistent with the calculated power deposition ***,it is observed that the energy of fast electrons increases rapidly after turning off the ECCD,which may be attributed to the acceleration by the recovered loop voltage at low electron density.

关键词： fast electron tokamak electron cyclotron current drive power deposition location

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Pulsating Torque Suppression of Flux Reversal Machines Based on Specific Harmonic Contributions of Rotor Permeance and PM MMF

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IEEE Transactions on Industry Applications 2025年

作者： Li, Junzhou Gao, Yuting Zhang, Chaofeng Zha, Xiaoming Qu, Ronghai Wuhan University School of Electrical Engineering and Automation Wuhan430072 China Key Laboratory of Integrated Energy Power Equipment and System Security Hubei430206 China State Grid Henan Electric Power Research Institute Zhengzhou450052 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

Flux reversal machines (FRMs) exhibit high torque density, but also significant pulsating torque, including cogging torque and torque ripple. Traditional methods fail to separate the harmonics that affect torque density and pulsating torque, leading to a degradation of torque density when reducing pulsating torque. Therefore, to maintain torque density and simultaneously reduce pulsating torque, this paper proposes a novel FRM configuration incorporating shape designs for the rotor and permanent magnets (PMs). First, the key generation mechanisms of cogging torque, average torque, and torque ripple are thoroughly examined, with analytical expressions derived to classify the torque contributions of all air-gap magnetic field harmonics into negative-effect and positive-effect components. Further, the rotor and PM shapes are designed to enhance the positive-effect components and reduce the negative-effect ones of the air-gap permeance and magnetomotive force (MMF). The impacts of geometric parameters are evaluated by using a sensitivity-based hierarchical optimization approach. Then, the proposed FRM is comprehensively compared with a conventional FRM in terms of back-electromotive force (EMF), cogging torque, average torque, torque ripple, efficiency, etc. The results indicate that the proposed machine configuration achieves reductions in cogging torque and torque ripple by 90% and 86.8%, respectively, while maintaining consistent average torque. Finally, a 12-slot/10-pole FRM prototype was built and tested to validate the effectiveness of the proposed machine topology. © 1972-2012 IEEE.

关键词： Permanent magnets

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Minimum Steady-State Fault Current of GridForming Inverters With Virtual Impedance-Based Current Limiting Caused by Active Power Control

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IEEE Transactions on Power Electronics 2025年

作者： Liu, Tao Shi, Xiaojie Yan, Jianan Wang, Zhiqiang Yin, Tianxiang Lin, Lei State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China Imperial College London Energy Futures Lab Control and Power Group Electrical and Electronic Engineering Department LondonSW7 2AZ United Kingdom

Fault current limiting based on virtual impedance (VI) has been widely utilized in grid-forming (GFM) inverters. The VI magnitude is generally designed to its maximum value under the worst case, which reduces the point of common coupling (PCC) voltage magnitude to limit the steady-state fault current. However, this letter reveals that due to the constraints imposed by the active power control during the steady state, as the PCC voltage magnitude decreases, its phase angle increases, which has been ignored. The opposite effects of VI on the PCC voltage magnitude and phase angle lead to a minimum steady-state fault current that is independent of VI. During severe grid voltage sags, this minimum steady-state fault current can exceed the current limit, making the effective fault current limiting impossible by using VI alone. This finding provides new insights into the steady-state analysis and control optimization of GFM inverters. Experimental results validate the theoretical findings. © 1986-2012 IEEE.

关键词： Grid-forming control minimum steady-state fault current virtual impedance (VI)- based current limiting

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Study on the Morphology Characteristics of Epoxy Resin of Composite Insulator under Acid-heat Condition 8

Study on the Morphology Characteristics of Epoxy Resin of Co...

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2022 8th International Conference on Electrical engineering, Control and Robotics, EECR 2022

作者： Pan, Wenwu Zhang, Dandan Lu, Ming Li, Zhenbiao Gao, Chao Wan, Zhiyu School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China The Key Laboratory of Pulsed Power Technology Ministry of Education Wuhan430074 China Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Songshan South Road 85 Zhengzhou China

Whether epoxy resin is degraded or not in composite insulators is the most direct criterion to distinguish Decay-like fracture from brittle fracture and normally mechanical fracture. During the actual operation of composite insulators, the nitric acid produced by partial discharge and abnormal heating will accelerate the degradation and deterioration of epoxy resin of composite insulators. In this paper, the experimental platform under acid-heat condition is built by using heating furnace, grinding bottle and serpentine condensation tube, and the acid-heat deterioration experiments are carried out under 60 °C (3 mol/L and 5 mol/L) and 80 °C (3 mol/L and 5 mol/L) condition. The macroscopic and microscopic morphologies of epoxy resin after acid-heat deterioration are analyzed, and the morphology changes of epoxy resin under the influence of acid-heat coupling field are studied. Firstly, it is concluded that the epoxy resin changes directly from colorless to light yellow, and then from light yellow to dark yellow under the influence of acid-heat deterioration. In addition, in the early stage of deterioration, the bulge on the surface of epoxy resin decreases gradually. Meanwhile, the maximum height difference and standard deviation of the surface profile of epoxy resin also gradually decreases, and the roughness decreases. In the later stage of deterioration, cracks appear on the surface of epoxy resin and some epoxy resins fall off. At the same time, the maximum height difference and standard deviation of surface profile of epoxy resin increases. © Published under licence by IOP Publishing Ltd.

关键词： Epoxy resins

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Two-Degree-of- Freedom Sensorless Control Method Combining Extended Adaptive Full-Order Observer with Disturbance-Observer Based Controller for Induction Machine Drives

Two-Degree-of- Freedom Sensorless Control Method Combining E...

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Energy Systems and Electrical Power (ICESEP), International Conference on

作者： Jiangming Deng Fen Cao Siwei Cheng Wei Xu Jian Ge CRRC Zhuzhou Locomotive CO Ltd. Zhuzhou China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China Chinese Academy of Science Institute of Electrical Engineering Beijing China

ISBN: (数字)9798350353563

ISBN: (纸本)9798350353570

In sensorless control strategies for induction machines (IM), achieving high dynamic performance in speed control and observation is crucial. However, the sensorless control approach often struggles to provide satisfactory dynamic responses to varying speed references and load disturbances due to the extra dynamics between actual and observed speeds. To address this challenge, a systematic design method for the speed controller and observer in this paper. The proposed method combines the extended adaptive full-order observer (EAFO) with the disturbance observer-based controller (DOBC). As a result, the proposed method achieves a decoupled two-degree-of-freedom (2DOF) characteristic, enhancing speed tracking and load disturbance rejection abilities. Numerous simulation and experimental results demonstrate the superiority of the proposed algorithm.

关键词： Torque Systematics Design methodology Velocity control Sensorless control Drives Robustness

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Control Strategy of Smooth Switching between Grid-connected and Off-grid Operation for Multi-port Home Energy Router 4

Control Strategy of Smooth Switching between Grid-connected ...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Zheng, Pingkang Zhao, Caihong Wei, Bangda Cai, Tao Duan, Qing Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9781728171494

This paper takes home energy router(ER) as the research object and analyzes the topology of energy router(ER). From an economic point of view, the disturbance observation method is adopted to realize maximum power-point tracking (MPPT) control for the photovoltaic(PV) array. The controller of the energy storage converter and the DC load converter were designed, which can realize the charge and discharge management of the energy storage battery and the stability of the load voltage. Aiming at the problem of switching between grid-connected and off-grid operation modes on the AC side of the ER, design a pre-synchronization controller to realize the synchronization of the inverter output voltage and the grid voltage before switching from off-grid operation to grid- connected operation mode. Based on PQ-U/f control method, considering the problem of controller saturation, adopt a shared current loop controller structure, and use the state-following controller switching method to achieve smooth switching between grid-connected and off-grid operation. Finally, through Matlab/Simulink software simulation, the stability of the system and the feasibility of the control strategy are verified. © 2021 IEEE.

关键词： Energy storage

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