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Generating wind power time series based on its persistence and variation characteristics

Science China(Technological Sciences) 2014年第12期57卷 2475-2486页

作者： LI Jing Hua LI Jia Ming WEN Jin Yu CHENG Shi Jie XIE Hai Lian YUE Cheng Yan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologySchool of Electrical and Electronic Engineering School of Electrical Engineering Guangxi University ABB (China) Ltd. Corporate Research Center

Generation of wind power time series is an important foundational task for assisting electric power system planning and mak- ing decision. By analyzing the characteristics of wind power persistence and variation, th!.s paper proposes an improved Mar- kov chain Monte Carlo （MCMC） method, identified as the PV-MC method, for the direct generation of a synthetic series of wind power output. On the basis of the MCMC method, duration time and variation features are concluded in PV-MC method, gaining a more comprehensive reflection of wind power characteristics in the generated wind power time series. First, the wind power state series is generated to meet the state transition matrix based on the definition of the wind power state. Then, the time duration of each state in the series is determined by its respective duration character. Finally, the variation characteristic is used to convert the state series to a wind power time series. A significant amount of simulations are performed based on the PV-MC and MCMC methods and are then compared for 25 wind farms at 6 different locations throughout the world. The sim- ulation results show that the PV-MC method offers an excellent fit for the time domain features （persistence and variation characteristic） while holding other statistic features （mean value, variance, autocorrelation coefficient （ACC） and probability density function （PDF）） close to the MCMC method.

关键词： wind power time series generation persistence characteristic variation characteristic markov chain monte carlomethod

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Photonic Crystals: Light‐Patterned Crystallographic Direction of a Self‐Organized 3D Soft Photonic Crystal (Adv. Mater. 42/2017)

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advanced Materials 2017年第42期29卷

作者： Zhi‐Gang Zheng Cong‐Long Yuan Wei Hu Hari Krishna Bisoyi Ming‐Jie Tang Zhen Liu Pei‐Zhi Sun Wei‐Qiang Yang Xiao‐Qian Wang Dong Shen Yannian Li Fangfu Ye Yan‐Qing Lu Guoqiang Li Quan Li Department of Physics East China University of Science and Technology Shanghai 200237 China Liquid Crystal Institute and Chemical Physics Interdisciplinary Program Kent State University Kent OH 44242 USA National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures and College of Engineering and Applied Sciences Nanjing University Nanjing 210093 China Beijing National Laboratory for Condensed Matter Physics and CAS Key Laboratory of Soft Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Visual and Biomedical Optics Lab Department of Ophthalmology and Visual Science and Department of Electrical and Computer Engineering Ohio State University Columbus OH 43212 USA

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Multi-band microwave metamaterial absorber based on coplanar Jerusalem crosses

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Chinese Physics B 2014年第1期23卷 437-442页

作者：王国栋刘明海胡希伟孔令华程莉莉陈兆权 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China School of Physics Huazhong University of Science and Technology Wuhan 430074 China College of Electrical and Information Engineering Anhui University of Science and Technology Huainan 232001 China

The influence of the gap on the absorption performance of the conventional split ring resonator(SRR) absorber is investigated at microwave frequencies. Our simulated results reveal that the geometry of the square SRR can be equivalent to a Jerusalem cross(JC) resonator and its corresponding metamaterial absorber(MA) is changed to a JC absorber. The JC MA exhibits an experimental absorption peak of 99.1% at 8.72 GHz, which shows an excellent agreement with our simulated results. By simply assembling several JCs with slightly different geometric parameters next to each other into a unit cell, a perfect multi-band absorption can be effectively obtained. The experimental results show that the MA has four distinct and strong absorption peaks at 8.32 GHz, 9.8 GHz, 11.52 GHz and 13.24 GHz. Finally, the multi-reflection interference theory is introduced to interpret the absorption mechanism.

关键词： Jerusalem cross multi-band metamaterial absorber multi-reflection interference theory

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Design of a DC Busbar for the ITER PF Converter

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Plasma Science and technology 2014年第4期16卷 406-409页

作者：郭斌宋执权许留伟张明李金超蒋力傅鹏王敏董琳 College of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Institute of Plasma Physics Chinese Academy of Sciences China International Nuclear Fusion Energy Program Execution Center

The DC busbar is an important component for the ITER PF converter module to connect the converter and the reactor. This paper analyzes different cross-sections and different thermodynamic properties under natural-cooling and water-cooling conditions, and simulation is carried out by the software of the finite element method （FEM）. The result of the analysis shows that the water-cooling method is the better choice for the DC busbar.

关键词： cross-section temperature natural-cooling water-cooling DC busbar

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A high precision particle-moving algorithm for particle-in-cell simulation of plasma 5

A high precision particle-moving algorithm for particle-in-c...

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5th International Particle Accelerator Conference, IPAC 2014

作者： Li, Xiaofei Yue, Haikun Li, Dong Chen, Dezhi State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783954501328

A new particle-moving algorithm for particle-in-cell simulation of plasma is developed based on the Linear Multistep Method. The conventional and the new algorithms are investigated by numerical experiments, which are conducted in three typical fashions of the electron motions in electromagnetic fields, that is, cyclotron in homogeneous magnetic field, drift in E×B field and motions in inhomogeneous magnetic field. The new algorithm not only improves the accuracy but also relaxes the time step condition for the simulation. It can increase the computation efficiency. Copyright © 2014 CC-BY-3.0 and by the respective authors.

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Reconsideration of loop gain measurement of DC/DC converters

Reconsideration of loop gain measurement of DC/DC converters

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作者： Xiong, Chun Ruan, Xinbo Chen, Peilin Wang, Xuehua State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479956982

There are mainly two existing loop gain measurement methods, which are the modulating signal perturbation method (MSPM) and the pulse-width signal perturbation method (PSPM). This paper points out that there are differences between these methods, and the loop gain measured by the PSPM can be more easily used in the guidance of the controller design. Since the circuit implementation of the PSPM is not easy, the additional PWM modulation method (APMM) and the sample-and-hold method (SHM) with uncomplicated circuits are proposed. The experiment results verify the correctness of the theoretical analysis and the proposed loop gain measurement methods. © 2014 IEEE.

关键词： DC-DC converters

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Input impedance modeling of digital controlled bi-directional DC/DC converter with inductor current feedback

Input impedance modeling of digital controlled bi-directiona...

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2014 International Power Electronics and Application Conference and Exposition, IEEE PEAC 2014

作者： Li, Xing Lin, Hua Wang, Hua State Key Laboratory of Advanced Electromagnetic Engineering and Technology HuaZhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479967674

To investigate the input impedance of digital-controlled bi-directional DC/DC converters, this paper develops a modeling method based on the sampled-data approach. Because the nonlinear pulse-width modulator generates sideband components, the sideband effect occurs in a closed-loop converter. And the sampling process of a digital controlled system can significantly influence the sideband components. Taking these effects into account, the simplified sampled-data model is proposed, which is applicable up to the switching frequency. In a current-mode-controlled buck converter, the introduced model predicts the loop gain is unchanged while alters the method of modulation (leading-edge, trailing-edge, etc.), while the conventional average model fails to explain this phenomenon. And the proposed model can suits the measured data of input impedance while there is a considerable gap at half of the switching frequency between the conventional model and the measured data. Simulation and experimental results are provided to verify the achievements of the proposed model. © 2014 IEEE.

关键词： Feedback

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Design of microgrid energy management system based on labVIEW

Design of microgrid energy management system based on labVIE...

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

作者： Ge, Teng Yu Zhang, Bu Han Wu, Jun Li Jin, Bing Jie Zhao, Shuang Zhang, Kai Min State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783038351368

Microgrid can be applied in different locations, relative to traditional power technology. It can improve the reliability of users of electricity and power system operation. Distributed power in microgrid needs real-time and multi-objective optimization management. This paper discusses functions and structure of microgrid energy management system(MGEMS) when connected with the main grid. Problems in long-term and short-term energy management of microgrid are discussed. From the point of view of the software platform, the system structure of MGEMS software are proposed. On this basis, this paper discusses the way to construct modules of MGEMS and their functions. © (2014) Trans Tech Publications, Switzerland.

关键词： Energy management systems

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Analysis of FSCW SPM servo motor with static, dynamic and mixed eccentricity in aspects of radial force and vibration

Analysis of FSCW SPM servo motor with static, dynamic and mi...

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作者： Jia, Shaofeng Qu, Ronghai Li, Jian Fu, Zansong Chen, Hong Wu, Leilei State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479956982

This paper deeply discusses the effect of eccentricity, including static, dynamic and mixed eccentricity on the performance of FSCW SPM servo motor analytically and using finite element analysis (FEA) to validation. The effect of different kinds of eccentricity on magnetic field including magnet field and armature reaction field is described with three factor called modulation factor. The frequency and spatial mode order of radial force for static, dynamic and mixed eccentricity are analyzed and summarized with the analytical method and validated by FEA. It is found that compared with health machine, the frequency and mode order of radial force distort for eccentric machine: the static eccentricity (SE) extends the mode order but the frequency invariant while the dynamic eccentricity (DE) and mixed eccentricity (ME) change both the frequency and mode order of radial force. With the electromagnetic radial force obtained, we predict the vibration of the stator housing, and acoustic noise around the machine. The results show that due to the smallest spatial mode decrease and frequency spectra extension, the eccentric machines will have a large vibration both on load and without load for easier to resonance at some natural frequency compared with health machine. As a consequence, the noise level of eccentric machine will also enlarge. The analysis results is verified by experiment and can be explained reasonably. The work of this paper is helpful to design and analyze the motor which is used in the servo drive system and other similar occasions. © 2014 IEEE.

关键词： Finite element method

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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...

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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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