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International Conference on Electrical Machines, ICEM

作者： Leilei Wu Ronghai Qu Dawei Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479943883

Vernier machine is becoming a new generation of direct drive motor due to its feature of high torque at low speed based on the so-called “magnetic gear effect”. This paper investigates the winding pole number and the pole ratio defined as rotor pole number/winding pole number of the surface permanent magnet vernier machines (SPMVM) for performances of torque, power factor, etc. The variation of design parameters with pole ratio and winding pole number, such as split ratio, slot opening and permanent magnet thickness, while SPMVM reaches maximum torque are also analyzed based on the finite element analysis (FEA) tools. Some simulation results will be experimentally validated by prototypes being manufactured in the future.

关键词： Torque Windings Magnetic flux leakage Prototypes Saturation magnetization Stator windings

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Improved model-based predictive torque control algorithm with modified modulation index for doubly salient permanent magnet synchronous machines

Improved model-based predictive torque control algorithm wit...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Fengxiang Chen Wei Xu Ronghai Qu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479951635

The doubly salient permanent-magnet synchronous machine (DSPMSM) is a new type of brushless machine and has got worldwide concern for some advantages, such as high power/torque density, simple structure, and wide speed range. Due to its inherited doubly salient structure and special working principle, the DSPMSM suffers from severe torque and flux ripple. Although some conventional control algorithms have already found some applications to DSPMSM drive system, their drive performance are not excellent during the operation, e.g. slow dynamic response, large torque ripple especially in starting or low speed. This paper proposes an improved model based predictive torque control (MPTC) algorithm to reduce the torque and flux ripple of DSPMSM. First, it derives the mathematical model of DSPMSM and then obtains its mathematical equations of ABC and d-q coordinate systems. Second, it studies the model based predictive torque control strategy, including optimality and implementation principle. Third, it proposes an improved MPTC strategy with a modified modulation index to increase the drive performance of DSPMSM, such as dynamic response and stable smoothness of torque. Based on this strategy with the modified modulation index, the torque and flux ripple of DSPMSM are reduced obviously, along with controlling the inverter in real-time to minimize the converter switching frequency. Comprehensive simulations validate relevant theoretical analysis.

关键词： Torque Couplings Rotors Inductance Mathematical model Predictive models Cost function

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Comparison of interior and surface permanent magnet machines with fractional slot concentrated windings for direct-drive wind generators

Comparison of interior and surface permanent magnet machines...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Hong Chen Ronghai Qu Jian Li Bo Zhao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479951635

Large scale of wind generators is one of important methods to reduce the cost of the wind power system, and has been the growing trend of wind power market in recent years. In this paper, design strategies for large-scale permanent magnet (PM) generators with surface mounted PM (SPM) and V-shaped interior PM (IPM-V) are introduced. Since the weight and cost are the reference points for large-scale generators, influences of design parameters, such as pole number, magnet thickness, and yoke thickness, on total weights and costs are investigated. With the advantages of short end-windings and high torque density, fractional-slot concentrated windings (FSCWs) are adopted. Since the design parameters of the IPM generator are more than that of the SPM generator, the design flows of the IPM generator are also more complicated. Moreover, the performance of the optimal SPM and IPM wind generators with FSCWs are investigated respectively and compared, including flux density, back-electromotive force (EMF), power factor, torque density, torque ripple and losses. The capacities of anti-demagnetization of machines with both rotor types are also analyzed. Finite element analysis (FEA) is carried out in this paper to analyze and compare these performances.

关键词： Saturation magnetization Generators Magnetic flux leakage Demagnetization Torque Rotors

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Research on comprehensive assessment index system for transmission network planningalternatives

Research on comprehensive assessment index system for transm...

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

作者： Lin, Yong Li, Zuo Hong Dong, Mei Ling You, Da Hai Wang, Gang Chen, Wei Hua Guangdong Power Grid Development Research Institute Co. Ltd Guangzhou 510000 Guangdong Prince China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei Province China

ISBN: (纸本)9783038351368

In view of the lack of comprehensive and quantitative evaluation means for transmission network planning currently, a comprehensive assessment index system adapted to the characteristics of the transmission network planning is proposed, including6 strategic layer indices(safety and reliability, economic efficiency, flexibility and coordination, smart and green, controllable risk and social benefits), 16 target layer indices and 57 operating layer *** the assessment standard for each indexis determined to provide objective, comprehensive and systematic evaluation of transmission network planning alternatives as well as prepare for realization of the comprehensive evaluation of transmission network planning. © (2014) Trans Tech Publications, Switzerland.

关键词： Risk assessment

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Optimal scheduling of electric vehicle battery swap station based on time-of-use pricing

Optimal scheduling of electric vehicle battery swap station ...

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IEEE PES Asia-Pacific Power and Energy engineering Conference (APPEEC)

作者： Lijing Zhang Suhua Lou Yaowu Wu Lin Yi Bin Hu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan HUST China

ISBN: (纸本)9781479975389

Battery swap station (BSS) is an important energy supply place for electric vehicles (EVs), where discharged batteries could be replaced with fully charged ones. Therefore, an optimal scheduling model of the BSS under time-of-use (TOU) electricity price is proposed in this paper, which takes the particular constrains relating the BSS into account. Meanwhile, a statistic model of daily battery swapping demand based on historical data is developed to generate a scenario set of EVs' energy need, which can be reduced based on the Kantorovich distance(KD) to obtain a typical scenario set while still being close to the original set. The reasonability and validity of the proposed model is proved by a case study. The results show that the controlled domestic charging can smooth the charging curve as well as decrease the charging cost relative to the uncontrolled domestic charging. Moreover, the optimization results are sensitive to the charging level and the number of batteries in the BSS.

关键词： Batteries Pricing Power systems Optimal scheduling Electric vehicles

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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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Output Impedance Analysis of Digitally Controlled DC-DC Converter

Output Impedance Analysis of Digitally Controlled DC-DC Conv...

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IEEE Energy Conversion Congress and Exposition

作者： Hua Wang Hua Lin Xing Li Xingwei Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781479957774

In this paper, the effect of digital control on output impedance converter is analyzed. The continuous time equivalent model is used to describe the digital control system in voltage mode, then output impedance is derived by small-signal model. The time delay caused by digital control is considered to analyze output impedance. The analysis indicates that digital control sharpens the peak of output impedance which appears near the crossover frequency, the factors which affect the peak are presented. Experimental results verified the theoretical analysis.

关键词： Impedance Digital control TV Delay effects Voltage control Modulation Mathematical model

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Field balancing technique of a centrifuge for combined environmental test

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UPB Scientific Bulletin, Series D: Mechanical engineering 2014年第3期76卷 33-42页

作者： Xu, Guanhua He, Wen ShenRong, Zuochao Shen, Runjie Dai, Sujiang State Key Lab of Fluid Power Transmission and Control Zhejiang Province Key Laboratory of Advanced Manufacturing Technology Zhejiang University Hangzhou 310027 China Shanghai Key Laboratory of Spacecraft Mechanism Shanghai 201109 China Dept. of Control Science and Engineering College of Electronics and Information Engineering Tongji University Shanghai 201804 China Mechanical and Electrical Engineering College Jinhua College of Profession and Technology Jinhua 321017 China

Field balancing technique of a disc centrifuge for combined environmental test is presented. Considering the influence of machining error of the rotor, a novel method of signal acquisition is put forward to detect the machining error and pick up the real unbalanced vibration signal. The correlation filtering method is adopted to obtain the amplitude and the initial phase of vibration signal simultaneously. The mass-radius product and the phase of the original unbalance are identified by the influence coefficients method. Experimental results show that the proposed field balancing technique reduces the amplitude of the vibration from 29.7μm to 2.1μm.

关键词： Signal processing

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Thermal model of totally enclosed water-cooled permanent magnet synchronous machines for electric vehicle applications

Thermal model of totally enclosed water-cooled permanent mag...

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International Conference on Electrical Machines, ICEM

作者： Bin Zhang Ronghai Qu Wei Xu Jin Wang Yu Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

ISBN: (纸本)9781479943883

Totally enclosed water-cooled permanent magnet machines (TEWCPMMs) have been widely applied in electric vehicles (EVs) due to its advantages of high torque density, high power factor and strong overloading capacity. However, the TEWCPMM is often experienced with extremely high ambient temperature in very limited space, which may lead to serious machine faults. In order to investigate thermal performance deeply, after investigation on the air convection within the end-space, this paper presents a thermal model, which takes the influence of the air temperature within the end-space on the temperature distribution by convection into consideration. Combining electromagnetic finite-element analysis (FEA) with thermal resistance network (TRN) of the TEWCPMM, the thermal model is established, which is based on the law of heat flux balance in two continuous iterative calculations. Finally, experiments are performed on a 36-kW prototype to validate the proposed thermal model.

关键词： Rotors Heat transfer Thermal analysis Thermal resistance Magnetic flux Heating Temperature distribution

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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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