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Design of a low-energy and high-current-density ion beam system in RF source 1

Design of a low-energy and high-current-density ion beam sys...

引用

1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Xue, Feng Zuo, Chen Li, Dong Liu, Kaifeng Chen, Dezhi Gong, Jie Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

Hydrogen ions with low energy around 100 eV are broadly utilized in material science as hydrogen implantation in multi-material integration or dry cleaning of material surface. A low-energy ion beam system is designed using a radio frequency (RF) source to extract high-density hydrogen ions with energy of 100 eV, consisting of the plasma generator and extraction system. A triode system is designed to extract ion beam and control ion energy by means of an accelerating-deaccelerating structure with about 4500 V potential drop. The ion beam optics is simulated through a particle trajectories code with the aim of reducing beam divergence and ion loss to extract high density ions, optimizing beam extraction characteristic for sensitive parameters. The results show that ion beam of a high density of 91.96 A/m2 with adjustable energy from 75 to 100 eV can be obtained by adjusting extraction electrode (EE) potential, sliming the thickness of EE and matching the radius of apertures carefully. © 2020 IEEE.

关键词： Ion beams

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Ozone emission and electric characters of wire-plate corona discharge 1

Ozone emission and electric characters of wire-plate corona ...

引用

1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Hu, Yehong Yang, Yong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

Ozone emission of corona discharge has been studied for many years. We use Differential Optical Absorption Spectroscopy (DOAS) to build an optical detection system with a limit of 465 ppm and precision of 0.01 ppm to detect the ozone concentration, on this basis, we investigated the effect of voltage, materials, number of electrodes and gas flow on ozone emission. Compared with the negative corona discharge, positive corona produces a small amount of ozone at the same voltage, and more ozone is produced in positive pulse than that in positive DC. The electrode materials do not change the current-voltage characteristics of corona discharge, but silver and copper significantly reduce ozone production. The number of electrodes affects the electric field distribution thus the electron density is changed. At the same current, the more electrodes, the less ozone is generated. With the increase of gas flow, the ozone concentration decreases and reaches saturation concentration within a shorter time. © 2020 IEEE.

关键词： Electrodes

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Neural network based on immune algorithm for restoration in the power distribution system 1

Neural network based on immune algorithm for restoration in ...

引用

1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Ji, Qiang Li, Yuting Ye, Chang Wang, Shaorong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

The power distribution system plays an important role in transmitting power to users. When the power distribution system is pressed by the typhoon, how to choose a good restoration and optimal orders appears to be particularly important to dispatchers. This paper proposes a new restoration strategy and optimal method for components' repair orders, - that is, artificial neural network (ANN) based on the immune evolutionary algorithm. The proposed restoration strategy involves in load level, line power flow, and degree of reliability. The immune evolutionary algorithm is implemented by calculating and searching for the optimal solution of affinity between the antigen and antibody, where the mean square error between actual and designed output values of the neural network is regarded as the antigen, the weight and bias of the neural network is served as the antibody. Furthermore, the neural network is trained with those optimal weights and biases to predict components' repair orders. Compared with classical back-propagation and genetic algorithm, the proposed method has shown better performance for components' repair orders. © 2020 IEEE.

关键词： Neural networks

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Current sharing structure analysis and design of high-current thyristor converters based on PEEC method 1

Current sharing structure analysis and design of high-curren...

引用

1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Dong, Kehong Yang, Yong Song, Zhiquan Zhang, Ming Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

Current sharing among multi-parallel thyristors is a key task in the design of high-current converters. However, conventional current sharing methods seldom consider the stray inductance which acts a significant role in the current sharing. This paper mainly focuses on stray inductance, and builds a current sharing equation based on Partial Element Equivalent Circuit (PEEC) method for the current sharing analysis and design of high-current converters. The deduction of the equation is presented. As an example, the application of the proposed method in the design of the International Thermonuclear Experimental Reactor (ITER) Poloidal Field Converter Unit (PFCU) is briefly presented. The current sharing coefficient is over 0.8, which is greatly improved and beyond the required value. The method proposed in this paper can be used for the fast design of the physical layout of a converter, and further improve its current sharing along with conventional design methods. © 2020 IEEE.

关键词： Thyristors

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Dq admittance prediction of grid-tied VSCs under variable operating conditions 1

Dq admittance prediction of grid-tied VSCs under variable op...

引用

1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Qiu, Qi Ma, Rui Huang, Yifan Zhan, Meng Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

Impedance/admittance models (IM/AM) have been widely used to analyze the stability of grid-tied power electronic devices, such as voltage source converter (VSC). However, generally it is very difficult to predict AM of VSC under realistic black/gray-box conditions. This article provides a novel method to efficiently estimate the AM of the VSC under variable operating conditions. This article extends the nearly-decoupled AM (NDAM) for sequence AM to the dq domain and simplifies the algorithm by an iteration approach. A curve (transfer function) fitting method is further proposed to obtain the AM based on the information of a few disturbance frequencies, which could expedite the algorithm greatly. Finally, the above algorithms are verified by wide simulations under different control strategies. The whole approach can be called as improved nearly-decoupled AM (INDAM), which is expected to be applied to stability analysis of power-electronic-based power systems in practicality. © 2020 IEEE.

关键词： Transfer functions

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Study on the magnet design and beam extraction in a superconducting cyclotron 1

Study on the magnet design and beam extraction in a supercon...

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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Yan, Yan Fan, Kuanjun Zhang, Haijun Mei, Zhiyuan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

A 250MeV superconducting cyclotron (SCC250) for proton therapy is being constructed at Huazhong university of science and technology (HUST). A well-designed magnetic field and an excellent beam extraction are critical for obtaining the desired beam in the compact cyclotron. However, the high magnetic field brings about great challenges to achieve isochronism and high extraction efficiency. Poor field isochronism will cause severe particle acceleration problems. Besides, the enormous beam loss due to the small turn separation at the extraction region may lead to the damage of the superconducting system. This paper focuses on improving the field isochronism by cutting patches at different radii of the magnetic pole, and increasing the turn separation by adjusting the amplitude and phase of the first harmonic field. The resonances tune and the acceleration process are also optimized to acquire a high-quality beam. Calculations show that the error accuracy AB/B is smaller than 3 × 10-4, which meets the requirement of beam acceleration. And the turn separation can reach 7mm, which reduces the beam loss to an acceptable level. © 2020 IEEE.

关键词： Extraction

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Stability analysis of VSC based on SISO equivalent in current control time scale 1

Stability analysis of VSC based on SISO equivalent in curren...

引用

1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Peng, Yaxin Yuan, Xiaoming Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

Oscillations in current control (CC) timescale (higher than 50 Hz) caused by voltage source converters (VSCs) integrating into the weak grid have occurred. However, relevant studies lack enough mechanism cognitions of instability of such system. In order to guide the parameter setting of the controllers, this paper first presents a small signal model of VSC based on motion equation concept. Secondly, a SISO equivalent method which can quantitatively analyze the interaction between variables in MIMO is introduced. Thirdly, the influence of phase locked loop (PLL) bandwidth, current controller parameters in the d-axis and q-axis and filter bandwidth on the feedforward branch of terminal voltage on stability is analyzed based the SISO equivalent method, which can help engineers to study the mechanisms of the voltage amplitude/frequency stability. Finally, the simulations in time domain verify the correctness of the analyses. © 2020 IEEE.

关键词： Electric current control

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Research on supersonic and subsonic vacuum arc simulation 1

Research on supersonic and subsonic vacuum arc simulation

引用

1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Sun, Ke Dai, Ling Xiang, Lingfeng Lin, Fuchang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

In this paper, according to the magnetohydrodynamic (MHD) model of vacuum arc, vacuum arc is regarded as a two-fluid model of mixing electrons and ions, and the momentum equation, mass equation and energy equation of the fluid are coupled with the magnetic transfer equation and Maxwell equations. After that, the momentum equation and energy equation are secondary developed in Fluent, and the momentum equation and energy equation in Fluent are modified. According to the different characteristics of supersonic arc and subsonic arc, different anode boundary, cathode boundary and side boundary, namely fluid wall boundary conditions are set, and supersonic arc and subsonic arc are solved in fluent. The relationship between arc current and arc pressure, arc density, arc velocity and axial current density in supersonic arc and subsonic arc is obtained. © 2020 IEEE.

关键词： Electrodes

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Numerical simulation study on the effect of electrohydraulic discharge shock wave on rock cracking in static pressure environment 1

Numerical simulation study on the effect of electrohydraulic...

引用

1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Xiong, Liangli Liu, Yi Lin, Fuchang Pan, Yuan Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9781728196596

Electrohydraulic discharge shock wave (EHS) is a new technology of underwater discharge application, which is used to crack the rock mass. At present, when the rock mass is under static pressure, the cracking characteristics of the rock mass with repetitive EHSs are still unclear. In this paper, the static pressure environment is simulated by the particle flow numerical simulation software, and the numerical model of the rock fractured by EHS is established. Studies have shown that static pressure can inhibit the formation and development of microcracks. The higher the static pressure, the more cycles of EHS are needed to achieve the same microcrack density, or the discharge energy of EHS needs to be boosted. In terms of spatial distribution, the increase in static pressure will inhibit the development of the number and depth of the main fractures. Finally, this article discusses the relationship between crack density, static pressure, discharge energy and the number of actions of EHS. © 2020 IEEE.

关键词： Shock waves

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A nonzero vector PWM method to reduce common-mode voltage 1

A nonzero vector PWM method to reduce common-mode voltage

引用

1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Gao, Xuepeng Kong, Wubin Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

The common-mode voltage in three-phase inverter may harm the motor drive system. If only non-zero space vector is used, it can be suppressed by appropriate Space Vector Pulse Width Modulation (SVPWM) method. In this paper, a Nonzero Vector Pulse Width Modulation (NZPWM) technique is proposed to suppress common-mode voltage for three-phase inverter. In sectors I, III and V, instead of the real zero voltage vectors, two opposite voltage vectors near to the active voltage vectors are utilized. In sectors II, IV and VI, the first active voltage vector and the voltage vector opposite to the first active voltage vector are utilized. Therefore, the amplitude of common-mode voltage can be reduced to one sixth of DC bus voltage. Simulation and experimental results show that the proposed NZPWM is effective for common-mode voltage suppression. © 2020 IEEE.

关键词： Pulse width modulation

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