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Simulation analysis of electromagnetic interference of high-voltage pulse source 1

Simulation analysis of electromagnetic interference of high-...

引用

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

作者： Zhang, Mengyu He, Mengbing 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, the electromagnetic interference of a high voltage pulse discharge device is simulated and analyzed. The interference source, transmission route, and sensitive equipment are identified. The electromagnetic interference (EMI) problem is analyzed in detail by using the field-circuit cooperative electromagnetic simulation software CST. The simulation results show the voltage coupling caused by the high voltage of the main discharge to the electronic circuit of the control module, and the interference caused by the external electromagnetic pulse to the internal cable. Besides, through the simulation of the shielding effectiveness of the enclosure, some suggestions are given so that this kind of enclosure can resist electromagnetic interference from both outside and inside. By referring to the simulation of the electromagnetic interference mentioned in this paper, readers can get the ideas and methods of how they can use CST to deal with similar electromagnetic interference problems in their own device. This paper also shed light on the approach to distinguish the key elements of electromagnetic interference in similar devices or situations that contain both high power equipment and low power electronic equipment. © 2020 IEEE.

关键词： Cables

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Analysis of the flying-capacitor modular multilevel converter based on SiC MOSFET 1

Analysis of the flying-capacitor modular multilevel converte...

引用

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

作者： Jing, Kaiyuan Lin, Lei Yin, Tianxiang 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

Reducing the capacitor voltage ripple amplitude of the modular multilevel converter (MMC) submodule is expected to reduce the capacitance of the module capacitors, which is very important for the increase of the power density. In the method of reducing capacitor voltage fluctuations of MMC submodule, flying-capacitor modular multilevel converter (FC-MMC) has gained extensive attentions because of its good performance. It is characterized by the connection of upper and lower arm middle taps through a flying capacitor in per phase arm. However, the reduction of the capacitance of flying capacitor requires an increase in switching frequency, which means high switching loss for the converter. Therefore, SiC MOSFET has a good application prospect in FC-MMC due to its low switching loss. This paper mainly compares the capacitor voltage fluctuation between FC-MMC and MMC, and the advantages of SiC MOSFET in FC-MMC applications. © 2020 IEEE.

关键词： Capacitance

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Vibration characteristics for shifted-angle of multi-module motor with carrier phase-shift method 1

Vibration characteristics for shifted-angle of multi-module ...

引用

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

作者： Wang, Qiyuan Liu, Zicheng Jiang, Dong Liu, Kang Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

In recent years, the multi-module motor becomes more and more popular because of its advantage in control freedom. In the multi-module motor system driven by paralleled inverters, the carrier phase-shift modulation algorithm can change the phase of the radical electromagnetic force between the motor modules in high-frequency, which can change the motor vibration characteristics. This paper firstly analyzes the relationship between carrier shifted-angle and the radial electromagnetic force of the motor, theoretically. Then, the motor vibration experiments are implemented which obtains the vibration distribution of the multi-module motor under different carrier shifted-angles. According to theoretical analysis and experimental results, we can get the vibration characteristics and mechanism of multi-module motors with different carrier shifted-angles, which provide a new viewpoint for the further research on vibration reduction methods of multi-module motors. © 2020 IEEE.

关键词： Vibration analysis

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A density based convective storm identification method for radar data 1

A density based convective storm identification method for r...

引用

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

作者： Zhang, Zhuoyu Yang, Jin He, Zhenghao 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

Many convective storm identification algorithms based on radar data have been designed and widely used in forecasting applications not only weather departments, but also by the power departments, but the main innovation points of those algorithms are often focused on tracking and extrapolation methods. Most algorithms identify convective storm entities by defining contiguous regions that exceed one or more reflectivity threshold values. With the development of radar technology, the temporal and spatial resolution of radar data is getting higher and higher. The simple contiguous region method can't be well adapted to higher resolution data and can't meet diverse application requirements. This article devised a convective storm identification method based on a improved DBSCAN algorithm. Through comparing with a traditional method, it is found that the proposed method can provide more complete contour of identified storms and the identification result of high reflectivity regions is better, moreover, it has more parameters to adjust to meet more complex application requirements. © 2020 IEEE.

关键词： Storms

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Relationship between power flow transferring and path length using graph theory 1

Relationship between power flow transferring and path length...

引用

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

作者： Yu, Jiawei Yang, Ziqian 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

Unexpected power changes may lead to transmission line overload and even evolve into cascading breakout. To avoid this, the key is to analyze how the power flow transfers after disturbance. When the scale of the system is large, the accurate calculation of power flow transferring will require a lot of calculation and become more difficult. From the perspective of complex network, we build a bridge between path length and power correlation rate. The former is an inherent property of the network, and the latter is an electrical quantity for a specific power disturbance. We find that power, similar to liquids, tends to flow along the fast-moving path, that is, the path with short path length. Finally, the results are verified in radial and ring network respectively. It is hoped that this will provide an intuitive understanding for power system operators. © 2020 IEEE.

关键词： Complex networks

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A no-impact startup scheme for flexible excitation system based synchronous generator in CAES 1

A no-impact startup scheme for flexible excitation system ba...

引用

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

作者： Peng, Yuwei Mao, Chengxiong Wang, Dan Tian, Jie Zhang, Tiantian Guan, Zhitao Zhang, Mei 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

Compressed air energy storage (CAES) has been widely considered as a kind of energy storage device. CAES has the advantages of large capacity, fast dynamic response, long service life and low pollution to the environment. Synchronous generator is the mainstream way for CAES connecting to power system. Flexible excitation system based synchronous generator can benefit to compressed air energy storage in many regards, and conventional startup scheme cannot totally eliminate the inrush current in this case. A novel no-impact startup scheme is proposed, which can completely remove the impact of inrush current. The simulations and the experimental tests are carried out to compare the no-impact start up scheme with the conventional start up scheme, and the results demonstrate the superiority of the no-impact startup scheme. © 2020 IEEE.

关键词： Synchronous generators

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Six - Phase Motor fault-tolerant control based on deadbeat predictive current control 1

Six - Phase Motor fault-tolerant control based on deadbeat p...

引用

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

作者： Xu, Lei Xu, Qiang Huang, Muxing 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

Aiming at the single-phase open circuit fault of a six-phase permanent magnet synchronous motor(PMSM), take the neutral point of two sets of windings connected and not connected to the inverter as an example. Based on the principle of constant stator magnetomotive force, solve the residual phase current at the stator end and then establish the mathematical model of the remaining five-phase windings, and use the corresponding transformation matrix to construct a new rotating coordinate system for vector decoupling, and propose the vector of the six-phase motor under one-phase open circuit fault control strategy. In order to further improve the control effect after a phase failure, a deadbeat predictive current control strategy is proposed, which discretizes the mathematical model of the motor, and uses a current prediction controller to replace the traditional PI current regulator to achieve the deadbeat predictive current control of six - phase PMSM under phase failure. And based on Matlab/Simulink to complete simulation modeling and comparative analysis to verify the feasibility of the control strategy. © 2020 IEEE.

关键词： Stators

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Adaptive form of generator stator ground fault protection for the floating nuclear power plant grid-source direct connection system 1

Adaptive form of generator stator ground fault protection fo...

引用

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

作者： Xu, Wen Yin, Xianggen Wang, Yikai Qiao, Jian 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

Due to the high concentration of electricity generation and distribution in the floating nuclear power plant grid-source direct connection system, the generator stator ground fault protection is affected by the direct connection power grid. Traditional protection methods cannot distinguish the fault direction and are difficult to guarantee the extreme safety requirements of the nuclear islands. This paper analyzes the system ground fault, points out the limitations of the existing generator stator ground protection methods, and proposes an adaptive form of generator stator ground fault protection method. Based on the phase-current differential, the method can effectively distinguish the faults inside or outside the generator, which can also form the protection criterion and action strategies according to the fault degree. It can trip the generator smoothly under slight fault conditions, ensuring the safe and stable operation of the floating nuclear power plant. Simulation in PSCAD/EMTDC proves that the proposed method can effectively realize the selective coordination of the ground fault protection for the grid-source direct connection system. © 2020 IEEE.

关键词： Nuclear power plants

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Development of a power supply control system and virtual simulation based on docker 1

Development of a power supply control system and virtual sim...

引用

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

作者： Zhou, Chong Li, Dong Han, Wenjie Qin, Bin 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 proton therapy facility (HUST-PTF) based on a superconducting cyclotron is being developed by Huazhong University of Science and technology (HUST) and China Academy of Atomic Energy (CIAE). The beam transport system in this facility provides the required beam for the treatment rooms. The beamline control system (BCS) manages the operation of the degrader, beamline magnet power supplies (PS), diagnostics devices, etc. For additional security, BCS utilizes the OPC UA as the distributed control protocol. Since the PS controllers adopt a TCP communication protocol, an OPC UA server with TCP driver is developed as a gateway and front controller for PS control. In order to adapt fast beam-energy change, the "list-trigger"strategy is applied to the PS control. BCS downloads the respective current value lists to PS controllers before the treatment, and then triggers the PS controllers by pulse signals to alter the operation current to the next value in the list during the treatment. It is vital to decide when the current regulation process is complete in the transitional period, BCS should update the current values more frequent than the steady state. Therefore, the OPC UA server adopts the node dynamic refresh scheme. A virtual simulation based on docker followed by a thorough analysis are conducted on the PS control system, where the results show the node refresh time of the OPC UA server meets the PS control requirement. The virtual simulation is also proved to be cost-saving and reliable for control system tests and worth promoting. © 2020 IEEE.

关键词： Controllers

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Discharge characteristics of DC self-pulse touchable plasma jets 1

Discharge characteristics of DC self-pulse touchable plasma ...

引用

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

作者： Xu, Jiaxing Nie, Lanlan Lu, Xinpei 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 atmospheric pressure non-equilibrium plasma jet (APNP-Js) show great advantages in biomedicine application. This article introduces a touchable DC self-pulse jet with air or helium as the working gas. In order to have quantitative research on the discharge, the discharge current characteristic has been studied that includes the current amplitude, the half-width of the current, and the frequency of the current. Besides that, the nitrogen and oxygen have been added in helium cases to see the influence. For the touchable cases, the discharge mode for air is transient glow while for helium is filamentary. And with the discharge gap increases, the frequency decreases for two cases. The current amplitude changes slightly and half pulse width increases for air, while for helium the amplitude increases and half pulse width changes slightly. © 2020 IEEE.

关键词： Atmospheric pressure

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