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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...

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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...

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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...

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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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Traveling-wave-based fault location in electrical distribution systems with digital simulations

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Telkomnika (Telecommunication Computing Electronics and Control) 2014年第2期12卷 297-304页

作者： Tang, Jinrui Yin, Xianggen Zhang, Zhe State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Luoyu Road 1037 Wuhan 430074 Hubei Province China

Traveling-wave-based fault location in electrical distribution systems is an important safeguard for the distribution network reliability. The effectiveness of the methods is verified directly in power grid in the early stages, while different fault types can't appear in a short time. And normal dynamic physical simulation cannot meet the teaching demand either because of the limitation of transmission line model and other factors. So PSCAD/EMTDC and MATLAB are used to illustrate the the fault location methods in this paper, which can promote the traveling-wave-based fault-location technology. Meanwhile, the traveling-wave-based fault-location method based on characteristic frequencies is analyzed in this paper.

关键词： Electric lines

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Load balancing optimization of Parallel Monte-Carlo probabilistic load flow calculation based on OpenMP

Load balancing optimization of Parallel Monte-Carlo probabil...

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2014 International Conference on Power and Energy(ICPE 2014)

作者： F.Lu Y.Z.Li S.L.Lu B.H.Zhang X.K.Dai J.L.Wu State Grid Jibei Electric Power Company Limited State Key Laboratory of Advanced Electromagnetic Engineering and Technology

the algorithm of probabilistic load flow simulated by serial Monte-Carlo is more timeconsuming due to the more simulation times. It's difficult to meet the demand for rapid analysis and calculation of large-scale power grid. So it needs to change the serial algorithm into a parallel algorithm in order to shorten the time. But there is the problem of load unbalance with parallel algorithm. This paper firstly introduces that the probabilistic load flow simulated by Monte-Carlo is more time-consuming. Then based on the Open MP parallel programming model(Open Multi-Processing, Shared memory multi-threaded compiler directive), the probabilistic load flow simulated by Monte-Carlo is coarse-grained parallel processing. To deal with the problem of load imbalance in parallel process, we need optimize the Open MP parallel programming model through the Open MP instruction scheduling. With the IEEE162 standard bus system as an example, we simulated the probabilistic load flow based on serial Monte-Carlo for thirty thousand times. The results show that the Load balancing calculated by coarse-grained parallel probabilistic load flow was better, which used Open MP dynamic scheduling strategy, and we received considerable speedup and parallel efficiency.

关键词： Carlo Load balancing optimization of Parallel Monte-Carlo probabilistic load flow calculation based on OpenMP Monte

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Design Process of Dual-stator, Spoke-Array Vernier Permanent Magnet Machines

Design Process of Dual-stator, Spoke-Array Vernier Permanent...

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IEEE Energy Conversion Congress and Exposition

作者： Dawei Li Ronghai Qu Wei Xu Jian Li T.A. Lipo State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical & Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781479957774

Dual-stator, spoke-array vernier permanent magnet (DSSA VPM) machines proposed in the previous paper have been proven to be high-torque density and high-power factor. This paper presents the detailed DSSA VPM machines design process including comparison of different DSSA VPM topologies, analytical sizing equation, geometric size relationship and so on. Besides, some key parameters, such as the ratio of rotor poles to stator poles number, slot opening, magnet thickness etc., are optimized based on the finite element analysis (FEA). The combination of the analytical and FEA methods makes the design process time-saving and reliable. Finally, the design process is validated by the experimental tests on a DSSA VPM prototype.

关键词： Decision support systems Stator windings Rotors Magnetic flux Equations Mathematical model

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Design of Consequent Pole, Toroidal Winding, Outer Rotor Vernier Permanent Magnet Machines

Design of Consequent Pole, Toroidal Winding, Outer Rotor Ver...

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IEEE Energy Conversion Congress and Exposition

作者： Dawei Li Ronghai Qu Jian Li Wei Xu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical & Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781479957774

Vernier permanent magnet (VPM) machines are attracting more and more attentions for several advantages, such as high torque density, ultra low pulsation torque and so on. This paper proposes a consequent-pole, toroidal-winding, outer-rotor VPM machine, which owns much less magnet usage and shorter end-winding length than that of the regular VPM machine. It is also proved that this machine exhibits ～20% higher back-EMF and electromagnetic torque than that of regular VPM machines while its magnet usage is halved. In this paper, the influence of design parameters, such as pole arc, slot opening, magnet thickness etc., on the electromagnetic performance is analyzed based on the finite element analysis (FEA), and experimentally validated by a prototype machine.

关键词： Torque Rotors Stator windings Toroidal magnetic fields Stator cores Forging

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Research on coarse-grained parallel algorithm of the Monte-Carlo simulation for probabilistic load flow calculation

Research on coarse-grained parallel algorithm of the Monte-C...

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2014 International Conference on Power and Energy(ICPE 2014)

作者： Z.K.Wei J.F.Xu X.K.Dai B.H.Zhang S.L.Lu W.S.Deng State Grid Jibei Electric Power Company Limited State Key Laboratory of Advanced Electromagnetic Engineering and Technology

In order to improve the probabilistic load flow calculation efficiency of Monte-Carlo simulation to meet the large-scale power system analysis and calculation time requirements, this paper introduced the coarse-grained parallel algorithm of probabilistic load flow calculation. This paper firstly introduces the probabilistic load flow calculation simulated by the Monte-Carlo method, then based on the Open MP(Open Multi-Processing, shared memory multi-threaded compiler directive) parallel programming model, focuses on the main problems existed when to parallel processing of the serial probabilistic load flow program and its parallelizing. Taking IEEE14, 30, 57, 118, 162, 300, 600 bus system for example, carried out 30000 times MonteCarlo probabilistic load flow parallel simulation, results show that the coarse-grained parallel Monte-Carlo simulation of probabilistic load flow calculation gained considerable speedup and parallel efficiency.

关键词： Monte-Carlo simulation,probabilistic load flow,parallel computing,OpenMP

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Impacts of commutation voltage drop on self-exciting Air-Core Pulsed Alternator

Impacts of commutation voltage drop on self-exciting Air-Cor...

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electromagnetic Launch technology

作者： Hua Zhang Caiyong Ye Kexun Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology (HUST) Wuhan CO China

As a novel pulsed power supply, the Air-Core Alternator is outstanding in providing repetitive pulse with high energy density, and preferred in a variety of fields including laser and electromagnetic launch, etc. In order to achieve a superior field excitation power supply, the Air-Core Pulsed Alternator usually adopts a self-excitation module, putting some emphasis on the design of the excitation conditions. In previous studies, the commutation voltage drop is neglected in excitation conditions analyses. However, the drop may have some significant impacts on the excitation conditions, and the neglect would cause a deviation between analyses and practices. This paper focuses on the analysis of excitation condition, taking the commutation voltage drop into account.

关键词： Windings Alternators Mathematical model Commutation Rectifiers Radio frequency Equations

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