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A probabilistic load flow method based on markov chain wind power prediction

A probabilistic load flow method based on markov chain wind ...

引用

3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Deng, Wei Si Zhang, Bu Han Ding, Hong Fa Wang, Ke Zeng, Dan Zhang, Kai Min Shao, Jian Ge, Teng Yu Jin, Bing Jie State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Nanjing China

ISBN: (纸本)9783038351344

With the wind power installed capacity increased, it brings great challenges to the stable operation of the power grid. In order to take consideration of the wind power impact, this paper proposes a wind power variability model applied to the probabilistic load flow calculation using the method of combined cumulants and improved Von-Mises Expansion. This wind power variability model combines the concept of Markov chain process and scenario tree theory, taking in to account the relationships of the outputs of wind turbines at adjacent moment by considering the coupling interaction at different time intervals. Computer simulations verify the effectiveness and applicability of the proposed method through IEEE bus-39 New England case study. © (2014) Trans Tech Publications, Switzerland.

关键词： Wind turbines

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A battery-operated atmospheric-pressure plasma wand for biomedical applications 41

A battery-operated atmospheric-pressure plasma wand for biom...

引用

41st IEEE International Conference on Plasma Science, ICOPS 2014 and the 20th IEEE International Conference on High-Power Particle Beams, BEAMS 2014

作者： Lu, Xinpei Pei, Xuekai State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei430074 China

ISBN: (纸本)9781479927111

In the past decade room-temperature atmospheric pressure plasma jets (RT-APPJs) have attracted a lot of attention due to their applications in the field of health care and medicine, including bacteria inactivation, blood coagulation, wound healing, teeth whitening, and tooth root canal treatment. To fulfill the specific requirements of various applications, many different types of RT-APPJs with different designs and driven by different power sources, including kHz AC, RF, microwave, pulsed DC and DC voltages, have been developed. On the other hand, external power sources (e.g., wall power or power generator) are needed for all these devices. In addition, most of these devices also need gas supply (e.g., He, Ar). Furthermore, for applications where bacteria, fungi, or viruses are hidden in narrow channels such as nasal cavity and ear canal, most of the currently available devices are not suitable for such situations. In this paper, a handheld, battery operated atmospheric pressure plasma rod (named plasma wand) which does not rely on external power source (e.g., wall power or power generator) and gas supply is reported. The plasma wand can be used for killing bacteria, fungi, or viruses that are hidden in narrow channels such as nasal cavity and ear canal, which are difficult to access using most of currently available devices. Besides, the electrical characterization, plasma wand temperature, emission spectra of the plasma, ozone and OH radical concentration generated by the device, are investigated by different diagnostic methods. The ozone concentration reaches 120 ppm at 1 mm away from the device and the OH concentration reaches 3.5¡Á1014 cm-3 in the plasma. The preliminary bacteria inactivation experiment results show that all bacteria samples on the microfiltration membrane are killed by this device within 30 s.

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The impact of charging plug-in electric vehicles on distribution system considering spatial and temporal distribution

The impact of charging plug-in electric vehicles on distribu...

引用

3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Wang, Dong Hua Mao, Cheng Xiong Wang, Min Wei Lu, Ji Ming Fan, Hua Wang, Dan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei Province China

ISBN: (纸本)9783038351344

The plug-in electric vehicles (PEVs) would exert inevitable impact on distribution system operation due to the spatial and temporal stochastic nature of the charging load. Based on the probability distributions of battery charging start time and the initial state-of-charge (SOC), the spatial and temporal charging loads of PEVsare analyzed on load nature and charging behaviors among different functional distribution areas. Taking IEEE 33-bus distribution system as an example, the Monte Carlo method is adopted to simulate charging load under different charging strategies and charging places for assess the impact on network loss and nodal voltage using standard load flow calculations. The results show that the choice of control strategies can improve the impacts of PEVs charging on distribution grid;a well-developed public charging infrastructure could reduce the stress on the residential distribution systems;optimal assignment of PEVs charging in residential area and industrial or commercial areas would provide a reference for charging infrastructure construction. © (2014) Trans Tech Publications, Switzerland.

关键词： Plug-in electric vehicles

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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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作者： Li, Dawei Qu, Ronghai Xu, Wei Li, Jian Lipo, T.A. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781479956982

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. © 2014 IEEE.

关键词： Permanent magnets

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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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作者： Li, Dawei Qu, Ronghai Li, Jian Xu, Wei State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781479956982

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. © 2014 IEEE.

关键词： Finite element method

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Centralized control of large capacity parallel connected power conditioning system for battery energy storage system in microgrid

Centralized control of large capacity parallel connected pow...

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作者： Cai, Jiuqing Chen, Changsong Duan, Shanxu Yang, Dongdong State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781479956982

This paper presents a centralized control scheme that coordinates parallel operations of large capacity power conditioning system (PCS) for battery energy storage system (BESS) in Micro-grid (MG). The theoretical analysis of the different operation modes are studied, including grid-connected mode, islanded mode and transfer mode. To improve the power sharing accuracy during the islanded operation, a parallel control strategy based on communication network is applied in large-capacity system. Moreover, a novel seamless transfer method is proposed to implement three-phase PCS transition between grid-connected mode and islanded mode. Simulation and experimental results are provided to validate the feasibility of the proposed control strategy. © 2014 IEEE.

关键词： Battery storage

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An improved start-up method for LLC series resonant converter based on state-plane analysis

An improved start-up method for LLC series resonant converte...

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作者： Yang, Dongdong Chen, Changsong Duan, Shanxu Cai, Jiuqing State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781479956982

In order to limit the resonant current, the LLC resonant converter usually starts up with a frequency which is much higher than the resonant frequency. However, if the startup frequency is too high, the build-up time of the output voltage will be very long. Moreover, the start-up frequency is also limited by the hardware condition such as drive circuit. In this paper, the start-up process for the LLC resonant converter is investigated based on state-plane method. The expression of start-up current in the resonant tank is derived. The relationship between start-up current and start-up frequency is discussed. According to the analysis, some rules are given about how to select the start-up frequency. An improved start-up method is proposed to limit the start-up current at a low start-up frequency. Experimental results are presented to verify the conclusions. © 2014 IEEE.

关键词： Natural frequencies

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Thermal and Mechanical Optimization of Water Jacket of Permanent Magnet Synchronous Machines for EV Application

Thermal and Mechanical Optimization of Water Jacket of Perma...

引用

IEEE International Electric Machines and Drives Conference

作者： Bin Zhang Ronghai Qu Xinggang Fan Jin Wang State Key State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology

ISBN: (纸本)9781479979424

Water jacket of permanent magnet synchronous machines (PMSMs) not only undertakes the responsibility of heat dissipation, but also mechanical protection. However, due to PM drive motors of electric vehicles (EVs) working under the states of starting, accelerating and climbing in a harsh environment usually, which make the water jacket damage easily. This paper main investigate the optimization design of water jacket of the PMSM for ensuring the EV works steady. Firstly, an optimization scheme of water jacket is given in this paper, in which a convection heat transfer factor is proposed for evaluating the optimal number and size of water channel in the water jacket. Secondly, mechanical stress analysis is implemented on the water jacket for obtaining the optimal thickness of inner layer of water jacket. Finally, thermal analysis demonstrates the PMSM with the optimal water jacket has a good cooling capability. Some references about the cooling system design can be given in this paper.

关键词： Convection heat transfer coefficient Convection heat transfer factor Electric vehicle Permanent magnet synchronous machines Thermal optimization design Water jacket

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Ventilation and Thermal Improvement of Radial Forced Air-Cooled FSCW Permanent Magnet Synchronous Wind Generator

Ventilation and Thermal Improvement of Radial Forced Air-Coo...

引用

International Conference on Electrical Machines and Systems

作者： Xinggang Fan Ronghai Qu Bin Zhang Jian Li Center for Advanced Electrical Machines and Drives (CAEMD) State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479988068

Computational fluid dynamics (CFD) method is implemented to investigate the flow and heat transfer within the radial forced air-cooled fractional-slot concentrated-winding (FSCW) permanent magnet generator for decreasing ventilation loss and temperature rise. Firstly, a CFD model is established and the losses and boundary conditions are determined. Secondly, the fluid and temperature field of machines with different channel numbers and channel widths are calculated, and the ventilation and thermal performance are compared. Finally, an alternative cooling structure with radial winding holes through the slot center to dissipate heat from the winding directly, especially for the FSCW permanent magnet generators, is proposed in this paper. The results show that it is a promising alternate for decreasing the winding temperature.

关键词： CFD FSCW Ventilation

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Pulsating Torque Analysis & Reduction Methods on a Sine-wave PM Machine

Pulsating Torque Analysis & Reduction Methods on a Sine-wave...

引用

International Conference on Electrical Machines and Systems

作者： Xiaodong Hu Hanchang Chen Xunhao Zou State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781479988068

In order to decrease the magnitude of cogging torque and torque ripple in a specific sine-wave PM machine to meet a certain demand, in this paper, the mechanisms of cogging torque and torque ripple is illustrated. Furthmore, study on the relationship between pole/ slot combination and pulsating torque, optimum design of the major structure may influence torque pulsating, e.g. pole arc, tooth width, etc., and discussion on specially designed structures e.g. dummy teeth with different width and depth for minimizing pulsating torque are also investigated. On this basis, a 3-D prototype model is built to fit the requirement, which valid the conclusions from the pulsating torque reduction methods, cogging torque especially, analysis above.

关键词： PM Pulsating Torque

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