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Study on self-healing and lifetime characteristics of metallized film capacitor under high electric field

Study on self-healing and lifetime characteristics of metall...

引用

International Conference on Pulsed Power

作者： Yaohong Chen Fuchang Lin Hua Li Fei Lv Miao Zhang Zhiwei Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

High energy density capacitor is a key device in power supply source in electromagnetic Gun (EMG) system. In order to increase the reliability of the power source equipment, the lifetime of capacitors must be lengthened. The increasing of the capacitor's lifetime is mainly beneficial from its self-healing capability. Nevertheless the self-healing is the main reason for the capacitance loss of metallized film capacitors, and it might finally lead to the failure of a capacitor. Firstly, the research results show that the self-healing energy is the crucial factor which influences the self-healing process. Secondly, the paper analyzes the capacitance loss mechanism of metalized film capacitor, including the effect of electrode structure and interlayer air. And then, the corresponding methods of increasing the lifetime of the metalized film capacitors are proposed. At last, based on parameter optimization of electrode pattern construction and practical techniques, a dry-type compact metalized film capacitor with energy density of 2.0 MJ/m3 is designed and tested with a lifetime over 500 shots. And the impregnated metalized film capacitor can be expected to achieve a lifetime of 1000 shots. And the second type design with 1.5 MJ/m3 design with discharge current magnitudes up to 100 kA have already been testified in an electromagnetic Gun (EMG) system application.

关键词： Capacitors Films Capacitance Electrodes Discharges Windings Electric fields

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The applications of the electronic power transformer in Photovoltaic systems

The applications of the electronic power transformer in Phot...

引用

International Conference on Electrical and Control engineering (ICECE)

作者： Huang Xin Zhang Buhan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hua zhong University of Science and Technology Wuhan China

This paper research the Photovoltaic system accessed to the distribution network through the electronic power transformer (EPT) which is different from the conventional style. So the EPT is been slightly changed which is different from the type already been studied. The paper mainly study the work performance of the EPT when it is used in the Photovoltaic system which can adjust the voltage, current and power easily and make the system more controllable.

关键词： Power transformers Photovoltaic systems Voltage control Consumer electronics Frequency conversion Reactive power

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Study on erosion mechanism of graphite electrode in two-eletrode spark gap

Study on erosion mechanism of graphite electrode in two-elet...

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International Conference on Pulsed Power

作者： Han Zeng Fuchang Lin Cai Li Li Li Gang Liu Feng Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

In a high-powered single pulse system, the graphite electrode is better than other ordinary metal electrodes for high energy transfer and pulse discharge. The erosion mechanism of graphite electrode is investigated in the paper with the theory of thermodynamics and the results of experiment. The graphite electrode erosion process of high-powered spark gap switch is analyzed, based on the set up of a simplified mathematical model. From the model, it is shown that the relationship of the graphite electrode erosion and the charge transfer is linear, which is accordant with the results of experiment.

关键词： Heating Mathematical model Discharges Equations Cathodes Materials

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The research on the trigger characteristic of a three-electrode spark gap

The research on the trigger characteristic of a three-electr...

引用

International Conference on Pulsed Power

作者： Li Cai Xiangdong Qi Lee Li Han Zeng Zhengyang Zhou Fuchang Lin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

A three-electrode spark gap, with trigger electrode inside the lower electrode, is discussed in this paper. Some characteristics have been determined experimentally such as the influence of the air pressure on spark gap operation and the influence of the working undervoltage ratio on spark gap operation. Delay times were measured, and the statistical analysis of the obtained results is presented in the paper. Meanwhile, delay time as a function of working undervoltage ratio is evaluated, and it is found that working undervoltage ratio over 50% could effectively shorten the delay time. The result demonstrate that the operating voltage range between 50% and 70% might be considered for advancing trigger characteristic, prolonging the trigger electrode life and reducing the probability of self-fire.

关键词： Delay Electrodes Sparks Voltage measurement Switches Probes

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Simulation of the active compensated pulsed alternator with a laser flashlamp load based on simplified model

Simulation of the active compensated pulsed alternator with ...

引用

International Conference on Electrical Machines and Systems (ICEMS)

作者： Pei Yuan Kexun Yu Caiyong Ye Zhang'ao Ren State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology (HUST) China

This paper presents a nontraditional Laser power system which an active compensated pulsed alternator (ACPA) drives the flashlamp directly instead of the capacitor groups. As a result, the volume of the laser system is decreased because of the high energy density of ACPA. However, the matching between the output of the alternator and the laser flashlamp is significant and needs to be well analyzed. In order to solve this problem, based on the theory for ACPA, the author proposes a simplified model for the system of ACPA with the flashlamp load by the way of circuit simulation. The simulation results preliminarily illuminate how the performance of the ACPA laser power system is effected. Meanwhile, the simulation results can also supply a consultation for the future ACPA laser power system design and control.

关键词： Mathematical model Alternators Windings Power lasers Laser modes Power systems Impedance

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Simplified fuzzy logic based flux weakening speed control of IPMSM drive

Simplified fuzzy logic based flux weakening speed control of...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Huangyuan Wu Shuanghong Wang Chenglin Gu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

This paper presents a simplified fuzzy logic based speed control scheme of an interior permanent synchronous motor (IPMSM). The proposed FLC is designed based on conventional max torque per ampere below the rated speed and flux weakening control above the rated speed. The simplified fuzzy logic controller is suitable for real time implementation because of the less computational burden. The application MATLAB Simulink was used for simulations of the FLC based IPMSM drive. The efficacy of the proposed simplified fuzzy logic controller base drive of the IPMSM with flux weakening is verified by the simulation.

关键词： Torque Mathematical model Permanent magnet motors Synchronous motors Fuzzy logic Equations Industries

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Study of the operation of parallel cables

Study of the operation of parallel cables

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International Conference on advanced Power System Automation and Protection (APAP)

作者： XiangPing Kong Yang Cao Zhe Zhang XiangGen Yin Xing Deng YuXue Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology) Wuhan 430074 China

Due to the manifest electromagnetic coupling effect, parallel cables cause couples of problems to its operation safety and management. The present paper describes the questions brought by parallel cables from the following three aspects: influence on parameter asymmetry, influence on induced voltage in metal shield of cables and influence on distance protection. This paper analyzes the parameter asymmetry of several typical arrangements for parallel cables comparatively. The influence of phase distance and arrangement of cables on induced voltage in metal shield of cables is also illustrated. In the end, the operating characteristic of distance protection are studied in the specific project.

关键词： Power cables Cable shielding Metals Impedance Impedance measurement Fault location

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Investigation of a magnetic pulse compression system containing gas switch

Investigation of a magnetic pulse compression system contain...

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IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC)

作者： Haoyin Bai Chengzu Li Jun Liu Guoliang Huang Jinbo Jiang Mengbing He State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

On the basis of the principle of magnetic pulse compression (MPC), a new magnetic pulse compression system based on magnetic switch (MS) is designed. The MPC system omits the external remagnetization circuits of the magnetic switch, and this prominent advantage can not only reduce the volume of magnetic switch, but also make the whole MPC unit more simple and compact. Detailed analysis of the working principle of this MPC system is presented. In this MPC device, we utilize the prominent advantage of magnetic switch to improve the turn-on and insulation recovery characteristics of gas switches, which can increase the repetition rate and life time of gas switches effectively. A device of this type has been successfully applied to switching a 6Ω resistive load. The current pulse produced on this load has a rising time about 500 ns and its peak value and duration are 508 A and 1.5 μs, respectively. And the operating frequency of a three electrodes switch can reach to 200 Hz.

关键词： Switches Magnetic cores Saturation magnetization Magnetic circuits Magnetic materials Photonic crystals Switching circuits

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Mirnov coils system on the J-TEXT tokamak

Mirnov coils system on the J-TEXT tokamak

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第十五届全国等离子体科学技术会议

作者：何炎丁永华金雪松陈真真庄革潘垣 State Key Laboratory of Advanced Electromagnetic Engineering and Technology CHINA-USA Joint Fusion Laboratory J-TEXT Huazhong University of Science and Technology

Two poloidal arrays and a toroidal array of Mimov coils are developed on the J-TEXT tokaraak to measure the magnetic fluctuations and study external MHD *** the Mimov coils data,the mode stmcture and frequency can be detected and analyzed for the J-TEXT *** Singular Value Decomposition(SVD) technique has been successfully applied to the Mimov coils data to determine(m,n) of the mode.

关键词： J-TEXT Mirnov coils magnetic fluctuation mode structure

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Fault location in distribution networks using Prony analysis

Fault location in distribution networks using Prony analysis

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International Conference on advanced Power System Automation and Protection (APAP)

作者： JinRui Tang Yin XiangGen Zhang Zhe He ZhiQin Ye Lei Yuxue Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China Hubei Electric Power Security and High Efficiency Key Lab Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

This paper proposes a new fault location method in distribution networks using Prony analysis. This method just needs the measured voltage transients without multi-recording nodes. Fault-originated traveling waves propagate along the distribution network and reflect at the discontinuity points, so the recorded transients contain some characteristic frequencies associated with specific paths, which can reveal the fault position. Firstly, model and simulate the distribution network using PSCAD/EMTDC to get the recorded signals associated with the typical fault positions. Secondly, extract the frequencies of the recorded signal using Prony analysis to generate the database for fault location. Finally, the real fault-originated signal will be analyzed to locate the fault point by searching the database for fault location based the matching rule. The matching rule is the least squares between the frequencies of the real fault-originated signal and the frequencies corresponding one typical fault position in the database. The simulation results demonstrate that the method is practical, reliable and effective.

关键词： Fault location Circuit faults Transient analysis Databases Time frequency analysis Power systems

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