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Design of a Quasi-Optical Launcher for 263 GHz Low Order Mode gyrotron 3

Design of a Quasi-Optical Launcher for 263 GHz Low Order Mod...

引用

3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Zhou, Hanqing Huang, Yu Chen, Xianfei Xiao, Houxiu Wuhan National High Magnetic Filed Center State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Sci-ence and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

In this paper, a Quasi-Optical launcher operating at 263 GHz with low order TE3,2 mode is designed for THz gyrotron at Wuhan National High Magnetic Center (WHMFC). A TE3,2 to TE8,3mode converter is designed up front, because the lower-order operating mode TE3,2 does not follow the mode selection rules for Denisov-type launchers. The launcher consists of a left-handed (LH) TE3,2 to right-handed (RH) TE8,211-fold helically corrugated waveguide mode converter, a TE8,2to TE8,3azimuthally symmetric ripple-wall waveguide mode converter and a Denisov-type launcher. A coupled-wave theory MATLAB code for analysis of the electromagnetic fields at the deformed waveguide wall has been developed. The commercial simulation result shows the launcher can generate a Gaussian-like mode with a scalar correlation coefficient of 93.50% and a vector correlation coefficient of 85.65% at the launcher aperture. © 2022 IEEE.

关键词： Gyrotrons

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Size Design of the Storage Tank in Liquid Hydrogen Superconducting Magnetic Energy Storage Considering the Coupling of Energy and Matter

Size Design of the Storage Tank in Liquid Hydrogen Supercond...

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Sustainable Power and Energy Conference (iSPEC)

作者： Chuang Wang Li Li Meng Song Ying Xu Kewei Hu Zhiyao Zhong Zhixing Yang Jiakun Fang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

The liquid hydrogen superconducting magnetic energy storage (LIQHYSMES) is an emerging hybrid energy storage device for improving the power quality in the new-type power system with a high proportion of renewable energy. It combines the superconducting magnetic energy storage (SMES) for the short-term buffering and the use of liquid hydrogen as both the bulk energy carrier and coolant. The storage tank is the core component of LIQHYSMES where the energy and matter are coupled. Therefore, this paper proposes the size design model for the storage tank in order to minimize the whole costs of LIQHYSMES. The thermal interactions between the SMES and hydrogen of both charging and discharging states are explicitly analyzed through the proposed model. Particularly, the phase transition of hydrogen in the storage tank, the charging state and thermal effect of SMES and the control strategy of electricity-hydrogen devices are modelled. Finally, case studies verified the effectiveness of the proposed model and the parameters of the storage tank are given.

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Research and Analysis of Equivalent Circuit Model for Core Snubber

Research and Analysis of Equivalent Circuit Model for Core S...

引用

2022 International Conference on Smart Energy and Electrical engineering, SEEE 2022

作者： Li, Zhiheng Ma, Shaoxiang Wang, Yongmao Zhu, Bangyou Zhang, Hongqi Zhang, Ming Pan, Yuan Yu, Kexun International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Wuhan Second Ship Design and Research Institute Wuhan430205 China

The ion source is the key to the NBI. It is very sensitive to overvoltage and overcurrent, and the breakdown frequently occurs between the acceleration grid. The core snubber is the most suitable surge suppression device to achieve DC fault protection. This paper introduces some basic concepts, comparing the core snubber's material properties and important parameters. It also introduces the basic concept of an equivalent circuit model for snubber, including the derivation process and theoretical analysis. Then the characteristics of the snubber and surge suppression analysis are introduced. Finally, this paper looks forward to the future research direction of the snubber. © Published under licence by IOP Publishing Ltd.

关键词： Ion sources

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Influence of Sintering Temperature on the Microstructure and Properties of ZnO Varistor Ceramics Prepared by Chemical Precipitation Method

Influence of Sintering Temperature on the Microstructure and...

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2022 IEEE International Conference on Power Systems and Electrical technology, PSET 2022

作者： Cheng, Siyuan Dong, Manling Shi, Xi Guo, Lei Yao, Wei Wang, Wei Ma, Yunrui Corporation Research Institute State Grid Henan Electric Power Zhengzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781665489157

With the development of ZnO arresters towards high voltage gradient and miniaturization, more stringent requirements are put forward for ZnO varistor ceramics, and higher requirements are also placed on the uniformity of the distribution of added components in ZnO varistor ceramic powders. this paper, ZnO varistor powders were prepared by the chemical precipitation method, and ZnO varistor ceramics were prepared at different sintering The properties of the samples were analyzed by various characterization methods, and their microstructure and electrical properties were studied. The experimental findings indicate that the mean grain size of ZnO varistor ceramics become larger as the sintering temperature increases, and the grain boundary nonlinearity coefficient and potential barrier height first increase and then decrease. When the sintering temperature is 1050°C, the grain size of the ZnO varistor ceramic sample is better, the grain boundary barrier height is the highest, and the comprehensive electrical properties are better. Compared with the common 1100°C~1200°C in the literature, it not only reduces the energy consumption but also improves the performance of ZnO varistor ceramics. It is speculated that the uniform distribution of doping ions before sintering reduces the sintering temperature. The lower temperature reduces the volatilization of oxide additives such as bismuth oxide and avoids abnormal grain growth. © 2022 IEEE.

关键词： Sintering

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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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Power Energy Systems and Applications (ICoPESA), International Conference on

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

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.

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Star-Connected Modular Auxiliary Resonant Commutated Pole Inverter with Commutation-Aligned PWM Modulation

Star-Connected Modular Auxiliary Resonant Commutated Pole In...

引用

International Conference on Electrical Machines and Systems (ICEMS)

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

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.

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Investigation of False Data Injection Attacks: A Simulation Implementation and Classical Countermeasure Perspective

Investigation of False Data Injection Attacks: A Simulation ...

引用

Power and Energy (PandaFPE), Panda Forum on

作者： Ziyu Wang Jingyu Wang Dongyuan Shi State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

state Estimation (SE) is used to derive accurate operating states from redundant field measurements, wherein Bad Data Detection (BDD) is used to eliminate measurement outliers. In the past decade, False Data Injection (FDI) attacks have attracted extensive attention, as they provide a strategy to introduce bias to SE results by maliciously modifying measurements in a way that can bypass BDD. Regrettably, although FDI attacks are plausible in math, whether they are feasible in practice has not been paid enough attention. This paper tries to give an answer by formulating three FDI attack vectors, each exploiting the vulnerability of a different communication protocol to achieve background reconnaissance and data tampering. Based on the proposed attack vectors, the path of launching FDI attacks in a concrete cyber environment and the corresponding defense countermeasures are analyzed through cyber-physical co-simulation. Case studies demonstrate that applying classical countermeasures, such as cryptographic techniques and access control policies, can effectively frustrate FDI attacks in the real world. Futhermore, it can be summarized from the experiments that attackers may leverage side-effects of defense countermeasures to mount more subtle attacks. It is essential to consider defending against cyber-physical attacks from an overall perspective in the future.

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Research on LC series resonant high voltage capacitor charging power supply 5

Research on LC series resonant high voltage capacitor chargi...

引用

5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Zhao, He Wang, Xuehua Zheng, Yue Ding, Hongfa Yao, Chuan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Wuhan Second Ship Design and Research Institute Wuhan China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

For the pulse power system using capacitor as energy storage unit, the performance of capacitor charging power supply (CCPS) determines the stability of output voltage. With the rapid progress of high-frequency and high-power devices, high-frequency converter charging power has become the mainstream. Among them, the LC series resonant converter is an ideal charging power topology due to its excellent anti-short-circuit ability, constant current characteristics and soft switching. In this paper, the working characteristics of the LC series resonant converter are studied. Based on a CCPS with charging voltage of 10kV and charging capacity of 25kVA, a constant current-constant power charging control strategy is designed to improve the charging speed of CCPS. Simulation results show that this strategy reduces the charging time by 37.5% compared with the traditional constant current control strategy. At the same time, the influence of the stray capacitance of the transformer on the LC series resonant converter under the high voltage and high power situation is analyzed. © 2022 IEEE.

关键词： Capacitance

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

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

引用

International Conference on Electrical Machines and Systems (ICEMS)

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

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.

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A Denoising Scheme for Core Earth Current of Power Transformers

A Denoising Scheme for Core Earth Current of Power Transform...

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Electrical engineering and Control Science (IC2ECS), International Conference on

作者： Zhe Wu Zhaohui Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

The core earth current (CEC) is composed of a variety of components, some of which can reflect the health status of power transformers, such as the power frequency and its harmonic components can reflect power transformer core grounding state and core saturation degree, and some pulse components can reflect partial discharge in power transformers. Some high-frequency components can reflect the external shock (very fast transient overvoltage, lighting, etc.) suffered by power transformers. There are also some noise components introduced by ambient environment and measurement system. The existing CEC monitoring devices focus on part of the components, such as the power frequency and its harmonic components or partial discharge pulse component. Both devices are difficult to catch all anomalies in CEC. A current transformer (10Hz-200kHz) is used to sense CEC continuously to catch all abnormal waveforms in CEC. In order to extract the pulse components in CEC, a denoising scheme based on mathematical morphological (MM) filter and wavelet shrinkage is devoted. MM filter can suppress the low frequency component while maintaining the integrity of pulse components. For the purpose of filtering out the white noise in the signal and preserve the complete pulse waveform as much as possible, a new wavelet selection method that the optimum wavelet at each level is selected as the one maximizing the energy ratio of detailed coefficients beside and inside the range formed by the threshold is devoted. Simulated data and field data are used to compare several different wavelet selection methods, and the experimental results show that the pulse distortion extracted by this method is smaller than other methods.

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