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Metallized polypropylene film capacitors in repetitive pulse applications

Metallized polypropylene film capacitors in repetitive pulse...

引用

IEEE Symposium Power Modulator

作者： Hua Li Zhiwei Li Fuchang Lin Qin Zhang Bowen Wang Haoyuan Li Zhijian Xu Wenjuan Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan PR. China

With the expanding of the pulse application, high repetition pulse power technology has become an essential topic. Research to explore the application of self-healing capacitors to repetitive pulse power systems is of great importance. This paper focus on high energy density capacitors applied in repetitive pulse applications less than 100 Hz. Firstly, a heat transfer model based on the finite element method is developed to analyze the distribution of temperature rise in the capacitor. The simulation results are accordant with that of the experimental temperature rise. Secondly, lifetime characteristic of pulse capacitors applied in milliseconds pulse applications is investigated through the establishment of the repetition lifetime test platform. The results demonstrate that the lifetime will increase with the increase of the repetition rate. Moreover, failure mechanisms of pulse capacitor applied in high repetition rate must to be paid special attention. Excessive temperature rise combined with high electric field may result in the disastrous breakdown of the capacitors. Further research must be conducted to determine the failure mechanisms.

关键词： Capacitors Films Discharges (electric) Heating Heat transfer Electrodes

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Analysis, Design and Implementation of Phase-Shifted Series Resonant High-Voltage Capacitor Charging Power Supply and Its Fuzzy Logic Controller

Analysis, Design and Implementation of Phase-Shifted Series ...

引用

IEEE Energy Conversion Congress and Exposition

作者： Lei Lin Heqing Zhong Yu Deng Yongfu Liao Ao Li Yu Chen Li Peng State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology (HUST) Wuhan China

ISBN: (纸本)9781479957774

High-voltage capacitor charging power supply (HV-CCPS) is an important part of the capacitive pulsed power system. This paper mainly focuses on the analysis, design and implementation of HV-CCPS, which employs the phase-shifted series resonant converter (PS-SRC) as topology. When PS-SRC operates at over-resonant state, it has three operation modes. The electric characteristics and boundary conditions of these three operation modes are analyzed in detail. Based on the numerical analysis of the operation mode, which is most suitable for capacitor charging application, the resonant parameters design method is proposed to meet the requirement of constant charging current and high voltage gain of HV-CCPS. Furthermore, because it is hard to derive the accurate mathematical model of PS-SRC, fuzzy logic control strategy of HV-CCPS is proposed to control the charging current. The design and implementation of fuzzy controller is presented. An 8-kV PS-SRC HV-CCPS prototype has been built in laboratory, and experimental results verify the validity and the feasibility of the proposed resonant parameters design method and the charging current control strategy.

关键词： Capacitors Fuzzy logic Boundary conditions Resonant frequency Switching frequency Switches Equations

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Welding Behavior in Making and Breaking Operations of Electrical Contacts

Welding Behavior in Making and Breaking Operations of Electr...

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ICEC 2014;The 27th International Conference on Electrical Contacts

作者： Qian Wang Chun Liu Xixiu Wu Zhenbiao Li Du Liu Liu Jinyou Yang Xiaocheng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology School of Automation Wuhan University of Technology

To clarify where the exact position of dynamic welding occurrence is, electrical endurance tests are conducted with AgSnO2, AgNi and AgCdO contacts. Waveforms of contact force, displacement, voltage and current are recorded with labview during tests, which can make it out whether welding occurs during breaking or making operation. The experimental results shows welding may occur in breaking as well as in making operations, possible mechanism for welding in break is discussed.

关键词： Welding Electrical contacts Closing operation Breaking operation Electric contacts Welding Destruction laboratory Virtual Instrumentation engineering Workbenc waveforms Surgery

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Power system optimal dispatch under low-carbon economy with significant photovoltaic generation

Power system optimal dispatch under low-carbon economy with ...

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IEEE International Workshop on Intelligent Energy Systems (IWIES)

作者： Bin Hu Suhua Lou Yaowu Wu Siyu Lu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei Province China

ISBN: (纸本)9781479958580

Photovoltaic (PV) generation does not produce CO 2 emissions during operations. Developing PV generation is an effective way of developing a low-carbon electricity system. However, PV power output has the stochastic nature. It brings uncertainty to traditional power system dispatch problems. Based on the concept of low-carbon economy, this paper introduces carbon trading mechanism into power system dispatch first. Then, a probability distribution model of solar irradiance and PV power output is established, and risk reserve based on chance constrained programming is used to deal with the stochastic nature of PV power output. On this basis, an optimal dispatch model under low-carbon economy with significant PV generation is proposed. With the system generation cost, carbon trading cost and load shedding penalty incorporated in the objective function, the model proposed can effectively evaluate the power dispatch problem under low-carbon economy with significant PV generation. Finally, a 10-unit test system is simulated by applying the proposed model.

关键词： Carbon dioxide Power systems Economics Generators Stochastic processes Carbon Programming

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The Cost-Efficient, Full ZVS Range Hybrid Full-Bridge-Half-Bridge Family with Shared Lagging Leg: Topology Derivation, Optimization Design and Experimental Results

The Cost-Efficient, Full ZVS Range Hybrid Full-Bridge-Half-B...

引用

IEEE Energy Conversion Congress and Exposition

作者： Yu Chen Gang Wen Li Peng Yong Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology (HUST) Wuhan China

ISBN: (纸本)9781479957774

This paper focuses on a new dc-dc family, in which the lagging leg of a phase-shifted full bridge (PSFB) converter is also used to structure a new half bridge (HB) branch. Such a shared-lagging-leg (SLL) concept not only extends the ZVS range of lagging leg, but also provides another energy path for possible function extension, such as efficiency improvement and dynamical enhancement. In this paper, the existent SLL converters are reviewed and the general derivation of the SLL family is given, the ZVS feature in the SLL is analyzed and the possible improvements are presented. Finally, a new SLL converter integrating a current-driven PSFB and a LC resonant half bridge structures are proposed. The proposed SLL converter preserves all the advantages of its PSFB and HB counterparts, but eliminates their drawbacks, i.e., it has the minimal component amount, achieves the full ZVS range in the legs, eliminates the circle current and gets fully regulation in the output. The aforementioned analysis and design are also verified by the experimental results.

关键词： Zero voltage switching Topology Rectifiers Bridge circuits Switches Legged locomotion Capacitors

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High resolution radar target recognition based on distributed glint

High resolution radar target recognition based on distribute...

引用

2013 International Conference on Mechatronics and Automatic Control Systems, ICMS 2013

作者： Li, Baoguo Qi, Zongfeng Zhou, Ying Lei, Jing State Key Lab. of Complex Electromagnetic Environ. Effects on Electronics and Info. System of China Luoyang China School of Electronic Science and Engineering National University of Defense Technology Changsha China

ISBN: (纸本)9783319012728

To solve the problem of aspect angle sensitivity of range profile while used in radar target recognition, the concept "distributed glint" is presented for high resolution radar. The detailed deducing procedure of "distributed glint" is given through theoretical analysis. A new target recognition strategy based on range profile and distributed glint is proposed. Computer simulation proves that this method can greatly enhance the performance of recognition strategy based on range profile. © Springer International Publishing Switzerland 2014.

关键词： Radar target recognition

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Nine-Switch-Converter-Based DFIG Wind Power System and Its Dynamic Dc Voltage Assigned Approach for Low Voltage Riding Through (LVRT)

Nine-Switch-Converter-Based DFIG Wind Power System and Its D...

引用

IEEE Energy Conversion Congress and Exposition

作者： Gang Wen Yu Chen Zhihao Zhong Yong Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology (HUST) Wuhan China

ISBN: (纸本)9781479957774

This paper proposes a Doubly-Fed Induction Generator (DFIG) Wind Power System, which is driven by the novel Nine-Switch Converter (NSC) instead of the traditional twelve-switch back-to-back (B2B) converter. Moreover, a new adapted control method is proposed to fully use the high dc voltage of the NSC, with which the dc voltage could be dynamically assigned to the rotor-side branch and grid-side branch of the NSC, depending on the different grid conditions. With the proposed control, the gird-side branch gets higher voltage to maintain dc bus steady under normal condition, and the rotor-side branch gets higher voltage to withstand the rotor-overvoltage during Low Voltage Ride Through (LVRT). The proposed system and adapted control method ensure the rating capacity of the power devices can be fully used at any time, and no extra capacity margin on the power devices is required. Considering a traditional twelve-switch B2B converter requires extra capacity margins on its power devices, or additional auxiliary circuit to realize LVRT, the proposed NSC based system is more cost-efficient because it not only saves three power devices, but also achieves LVRT without additional auxiliary circuit.

关键词： Voltage control Wind power generation Rotors Voltage fluctuations Stators Control systems Modulation

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A smart energy management system for electric city bus battery swap station

A smart energy management system for electric city bus batte...

引用

IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific)

作者： Qian Dai Tao Cai Shanxu Duan Wei Zhang Jinbo Zhao State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology (HUST) Wuhan China

The electric vehicles battery swap station(BSS) as an important charging infrastructure has been built in many countries. The smart energy management system (EMS) is essential for economic operation for BSS with multi-energy. The proposed BSS-EMS is composed by charging demand forecasting module and BSS optimal charging scheduling module. An example study is carried out to validate the proposed EMS. The results indicate that the proposed multi-objective optimal charging model can significantly reduce both the charging cost and load variance approximately 40% compared to uncontrolled charging due to the charging load forecasting.

关键词： Batteries Energy management Forecasting System-on-chip Load modeling Optimization Schedules

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A Cost-effective Circuit for Three-Level Flying-Capacitor Buck Converter Combining the Soft-start, Flying Capacitor Pre-charging and Snubber Functions

A Cost-effective Circuit for Three-Level Flying-Capacitor Bu...

引用

IEEE Energy Conversion Congress and Exposition

作者： Zhihao Zhong Yu Chen Pengcheng Zhang Yong Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology (HUST) Wuhan China

ISBN: (纸本)9781479957774

The Three-Level Flying-Capacitor Buck (TL-FC-Buck) Converter is widely used in high voltage applications due to advantages such as the low voltage stresses on devices, double switching frequency on the inductor and the common ground between input and output. However, the flying capacitor needs to be pre-charged to half of the input voltage before the converter works. This paper proposes a novel and cost-effective auxiliary circuit, which integrates the precharging circuit with the inherent soft-start and snubber circuits. With the proposed approach, no additional components are required for pre-charging. The circuit thus becomes compact and cost-effective. The concept and analyses of the proposed circuit are presented in this paper, and the parameter design compromising the pre-charging time, voltage stresses of the devices during charging process and snubber losses are given. Finally, a prototype with 710V input, 230V output and 2.5kW rating power TL-FC-Buck converter is built to verify the design. Experimental results match the simulation quite well. With proper selection of parameters, the voltage stresses of devices can be acceptable, and the overall efficiency can still be high.

关键词： Buffer circuits precharge step-down converter Input Voltage HIGH VOLTAGE APPLICATION parametric design soft start Converters charging process VOLTAGE STRESS three-level inductors Low voltage Flying

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Transient analysis of air-core pulsed alternators in self-excitation mode

Transient analysis of air-core pulsed alternators in self-ex...

引用

electromagnetic Launch technology

作者： Xianfei Xie Kexun Yu Caiyong Ye Lei Tang Hua Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology (RUST) Wuhan China

In pulsed power supply for electromagnetic launchers, air-core pulsed alternators have obvious advantages to enhance the power density and energy density. Compared with conventional machines, the large excitation currents are required to establish the high flux densities needed in the air-core magnetic circuits, so the self-excitation mode is adopted in these systems. Therefore, we make great efforts on the conditions of self-excitation mode. This paper presents a detailed description about the transient process of the air-core pulsed alternator operating at self-excitation mode. First, it's necessary to supply a seed current rapidly prompting the alternator running at self-excitation mode. So the capacitance and pre-charged voltage on the capacitor in excitation initialization module determining the seed current is analyzed, a reasonable value range of the capacitance and the voltage can be decided. Then, when the machine is in self-excitation mode, a detailed study about the current and the voltage through the excitation winding and the armature winding are developed. Also some new concepts, such as `R feq ' meaning the equivalent impedance of the excitation winding and `K fi ' applied to evaluate the growth rate of the excitation current, are proposed to simplify the transient analysis. They also play a guiding role to improve our systems. Finally, the results of the SABER simulation are presented to validate our analysis.

关键词： Windings Alternators Capacitors Discharges (electric) Transient analysis Impedance Thyristors

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