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3rd IEEE International Conference on Electronic technology, Communication and Information, ICETCI 2023

作者： Pan, Wenhao Li, Dayi Yang, Xiao Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350398410

The active power filter with magnetic flux compensation can suppress the influence of background harmonics and load harmonics by increasing the harmonic impedance of the system. Flux compensated adjustable impedance is the key part of active power filter, which can increase the harmonic impedance without affecting the fundamental impedance. With the traditional compensation method, the adjustable impedance contains a negative resistance component in the frequency band between the fundamental and the harmonics, which may interact with the load impedance and cause the system resonance. After establishing a general mathematical model of adjustable impedance and system equivalent admittance, this paper analyzes the resonance mechanism, oscillation characteristics and key influencing factors of the harmonic oscillation. The damping suppression strategy is proposed to successfully eliminate the resonance while maintaining good harmonic suppression performance. The correctness of the analysis and the effectiveness of the suppression method are verified by simulation and experiment. © 2023 IEEE.

关键词： Damping

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Summary of research on synchronous generator excitation system 6

Summary of research on synchronous generator excitation syst...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Yin, Hao Yang, Xiao Xie, Xiong Wang, Weiyu Li, Dayi Zhang, Guangyi Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350346671

Under the background of 'double carbon' strategy including large-scale grid-connection of renewable energy and the power grid interconnection, new situations have put forward increasingly stringent requirements for the safety and stability of power systems in recent years. In this case, the excitation system plays an increasingly important role in the power system. The article summarizes the basic principle of the excitation system, discusses the current status and development tendency of excitation system from excitation mode and core parts of excitation system such as de-excitation device, rectifier device, excitation regulator. The article also discusses the basic theory and development direction of the excitation control strategy from the aspects of AVR and PSS. © 2023 IEEE.

关键词： Renewable energy resources

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A Distribution Network Loss Reduction Strategy Based on Seamless Closed-Loop Load Transfer Devices 3

A Distribution Network Loss Reduction Strategy Based on Seam...

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3rd Power System and Green Energy Conference, PSGEC 2023

作者： Du, Miaomiao Li, Jingqi Wang, Dan Mao, Chengxiong Guan, Zhitao Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350340099

Seamless closed-loop load transfer devices(SLTD) itself is used to ensure power supply, but it actually has potential applications in reducing network loss by appropriately transferring load. Aiming at distribution network loss attributable to the mismatching between the output of distributed new energy power supply and the electricity demand of load, a distribution network loss reduction strategy based on SLTD is proposed in this paper. Initially, the loss reduction mechanism is explained and a mathematical model is built. Secondly, a method for optimizing target preprocessing is proposed to reduce the dimensionality of the target data, after which sparrow search algorithm(SSA) is adopted for solution seeking. Finally, a regional distribution network in an urban of China is used as an example to demonstrate the availability of the proposed strategy. Moreover, this strategy shows the potential value of the current stock assets of distribution network. © 2023 IEEE.

关键词： Electric power distribution

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Design of Digital PR Controller for L-type Grid-Connected Inverter 6

Design of Digital PR Controller for L-type Grid-Connected In...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Yuan, Aote Cai, Tao Ji, Binrong Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350346671

As a key link between the DC source and the grid, the L-type grid-connected inverter must have good and stable control performance. In this paper, the current inner loop of L-type inverter is studied and the PR controller is designed by analog method and direct digital method. The performance differences between the discretization methods are compared, and the effect of sampling frequency on the discrete error is also analyzed. In the direct numerical method, the law between the controller parameters and the open-loop root trajectory is analyzed, and two sets of PR controllers are designed based on this. Through simulation experiments, it is verified that the PR controller designed by the direct digital method in this paper can achieve smaller overshoot and faster regulation. © 2023 IEEE.

关键词： Controllers

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Dynamic Analysis of No-Insulation Insert Magnet Under Changing Background Magnetic Field

Dynamic Analysis of No-Insulation Insert Magnet Under Changi...

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2023 IEEE International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD 2023

作者： Duan, Pu Ren, Li Xu, Ying Shi, Jing Tang, Yuejin Li, Jingdong School of Electrical and Electronic Engineering The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350301571

Due to the excellent thermal stability and high-power density in steady state, no-insulation (NI) winding technology is widely used in the application of superconducting magnets. However, current ripple and background magnetic field fluctuations caused by relative devices result in repetitive turn-to-turn current of the NI insert magnet, which will impose a great impact on the thermal stability of the NI magnet. This paper analyzes the cylindrical and radial current distributions of NI magnet under dynamic operating conditions by 2D finite-element method. The results provide references of thermal conductive structure design and assessment of operational reliability of NI magnets in changing working conditions. © 2023 IEEE.

关键词： current distribution dynamic analysis electric field finite element NI magnet

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Analysis and Design of the Feedforward Strategy for Inverters in the Weak Grid with Sequence Impedance Model

Analysis and Design of the Feedforward Strategy for Inverter...

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2023 International Conference on Power Energy Systems and Applications, ICoPESA 2023

作者： Bai, Chenxi Peng, Te Song, Xuan Duan, Shanxu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350345605

The weak grid has gradually become the conventional working environment for the existing distributed energy sources, and the instability caused by the interaction between the grid and the inverter has drawn much attention. For the actual grid- connected system, there are two significant control methods. One is the resonant controller, used to reduce the harmonics for the quality of grid current. The other is the grid voltage feedforward strategy, which is quite important for system stability and no inrush start-up. However, the system might become unstable if these two strategies are used together, since the grid voltage feedforward will cause the loss of phase margin at the resonant frequency of resonant controller. Therefore, a band-stop feedforward strategy is proposed to solve this contradiction while balancing the advantages of these two important strategies, which is carefully designed based on the sequence impedance model. An experimental platform is built to verify the effectiveness of the proposed method. © 2023 IEEE.

关键词： System stability

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A Synchronous Rectification Scheme for Three-Phase LLC Considering Phase Shedding

A Synchronous Rectification Scheme for Three-Phase LLC Consi...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Guo, Shuaichen Wang, Xuehua Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350307832

The three-phase LLC resonant converter has gained much attention in battery charger application due to its excellent characteristics such as automatic current sharing, increased power levels, and lower output capacitor current ripple. Moreover, three-phase LLC could improve the converter's efficiency at light load through phase shedding, which is suitable for the absorption stage in charging cycle. However, phase shedding changes actual topology of the converter, which brings challenges to synchronous rectification (SR) scheme. To solve this issue, this paper presents a universal SR scheme for all operating modes of three-phase LLC considering phase shedding. Considering the characteristics of three operating modes and the differences of phase shedding strategy corresponding to every charging stage, how to generate driving signals for synchronous rectifier is discussed in detail. Finally, the effectiveness of the proposed scheme is verified by simulation results. © 2023 IEEE.

关键词： Charging (batteries)

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Sensorless Control of Switched Reluctance Motor Based on Sliding Mode Observer Using Nonlinear Flux Linkage Model 26

Sensorless Control of Switched Reluctance Motor Based on Sli...

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

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

ISBN: (纸本)9798350317589

This paper proposes an improved position sensorless control method for switched reluctance motor (SRM) based on a sliding mode observer (SMO) using nonlinear polynomial flux linkage model. Firstly, in order to balance the accuracy and complexity of SMO, a nonlinear polynomial flux linkage model with variable coefficients is introduced. Then, a modified SMO utilizing the switching function is designed to estimate rotor position and speed. Finally, comparison simulation results are presented to verify the accuracy and robustness of the proposed sensorless method. © 2023 IEEE.

关键词： Sensorless control

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Design and experimental study of a field-reversed configuration plasma thruster prototype

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Plasma Science and technology 2025年第3期27卷 118-126页

作者： Yuxuan HUANG Ming ZHANG Yong YANG Fangwei LYU Xiaopeng YI Chaofan LYU Yisong ZHANG Bo RAO 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 National Key Laboratory of Science and Technology on Vacuum Technology and Physics Lanzhou Institute of PhysicsLanzhou 730000People’s Republic of China

The field-reversed configuration(FRC)plasma thruster driven by rotating magnetic field(RMF),abbreviated as the RMF-FRC thruster,is a new type of electric propulsion technology that is expected to accelerate the deep space *** experimental prototype,including diagnostic devices,was designed and constructed based on the principles of the RMF-FRC thruster,with an RMF frequency of 210 kHz and a maximum peak current of 2 *** the rated operating conditions,the initial plasma density was measured to be 5×10^(17)m^(-3),and increased to 2.2×10^(19)m^(-3)after the action of *** coupling efficiency of RMF was about 53%,and the plasma current reached 1.9 *** axial magnetic field changed in reverse by 155 Gauss,successfully reversing the bias magnetic field of 60 Gauss,which verifies the formation of FRC *** optimization research,it was found that when the bias magnetic field is 100 Gauss,the axial magnetic field reverse variation caused by FRC is the highest at 164 *** experimental results are discussed and strategies are proposed to improve the performance of the prototype.

关键词： rotating magnetic field(RMF) field-reversed configuration(FRC) plasma thrusters plasma current

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The Effect of Damper on the Dynamic Performance of Energy Storage Synchronous Condenser for Active Power 26

The Effect of Damper on the Dynamic Performance of Energy St...

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

作者： Li, Xiaozhe Palanas, Patrick J. Chen, Xi Yu, Kexun Xie, Xianfei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350317589

With the large-scale access of new energy units and the rapid development of power electronics in the power system, the problems of low inertia and limited voltage support capacity faced by the power system are becoming more and more serious. The renewed focus on synchronous condenser has improved the voltage support capacity of the grid, but the low inertia problem is still serious due to the fixed rotor speed and limited inertia. There is an urgent need for a device that meets both voltage and frequency support. Energy Storage Synchronous Condenser (ESSC) is considered as a solution. However, for the problem of command delay, the ESSC with damper enables frequency adjustment automatically and is a better solution. In this paper, the effects of different damping parameters on the dynamic performance of the ESSC for active power are analyzed theoretically and simulatively, respectively. The results show that the ESSC with damper has ideal dynamic performance if proper damping parameters are used. © 2023 IEEE.

关键词： Energy storage

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