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Fuzzy modeling and solution of load flow considering uncertainties of wind power

Fuzzy modeling and solution of load flow considering uncerta...

引用

International Conference on Power and Energy, CPE 2014

作者： Wu, D.L. Zhang, B.H. Wu, J.L. Zhang, K.M. Deng, W.S. Jin, B.J. Wang, K. Zeng, D. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology WuhanHubei China NanjingJiangsu China

ISBN: (纸本)9781138027824

Power system load flow calculation is one of the most important types of electrical operations. However, due to the uncertainty presence of load and the growing attention to wind resource, traditional deterministic load flow analysis cannot meet the requirements with severe uncertainty. In the uncertainty load flow calculation methods, fuzzy load flow calculation method can give the possibility of load flow distribution in a very short time. So it plays a big role in the online grid computing. This paper has mentioned about the details of the fuzzy load flow calculation using the incremental method. And then it has applied to practical system—Ningxia Power Grid 151-bus system. By comparing with the results of Monte Carlo simulation method, numerical results have demonstrated the validity and effectiveness of the proposed model and method. © 2015 Taylor and Francis Group.

关键词： Fuzzy set theory

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Stator/Rotor Slot and Winding Pole Pair Combinations of DC Biased Sinusoidal Vernier Reluctance Machines

Stator/Rotor Slot and Winding Pole Pair Combinations of DC B...

引用

International Conference on Electrical Machines

作者： Shaofeng Jia Ronghai Qu Jian Li Dawei Li Rui Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology

ISBN: (纸本)9781509025398

The recent novel DC biased sinusoidal current reluctance machines (DC-biased VRMs) are similar to switched reluctance machines (SRMs) in terms of structure, as they both adopt the doubly salient structure and concentrated windings. However, the special characteristic of DC-biased VRMs is that their phase currents have both DC current and AC current. Therefore, it can be inferred that the vibration and noise can be much smaller than SRMs as the phase current waveform is smooth. Besides, compared with variable flux reluctance machines with specialized field windings, DC-biased VRMs exhibit better performance such as fewer copper loss and higher torque density. In this paper, the stator/rotor slot combinations and armature winding configurations with different pole pairs of the DC-biased VRMs are deeply investigated. Firstly, relationships among stator/rotor slots and armature winding pole pairs are given based on the working principles. Then, several feasible stator/rotor slot combinations are obtained, and the electromagnetic performances are compared by the finite element analysis (FEA). The results show that the 8-rotor-slot, 5 armature pole pair machine exhibits highest torque in rated load, but with highest torque density, the 10-rotor-slot, 4-armature pole pair machine shows highest torque in over load condition, and the 12/11 and 12/13 machine presents the minimum pulsation torque.

关键词： Winding pole pairs Reluctance machines Sinusoidal current with biased DC current Torque ripple Vernier reluctance machines Winding configurations

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A simulation study of the influence of magnetizing inrush current and sympathetic inrush current of converter transformers

A simulation study of the influence of magnetizing inrush cu...

引用

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

作者： Rui Li Shuyong Song Zhenguo Ma Han Jiang Biyue Huang Haishun Sun Chenying He Electric Power Research Institute ShanXi Provincial Electric Power Corp Taiyuan China China Electric Power Research Institute Beijing China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781509054190

Magnetizing inrush current will occur when the transformer is energized without load, which will cause that the already energized neighboring transformers generate sympathetic inrush current. The currents have influence on the operation of HVDC system if they occur in the converter transformers due to their characteristics. In this paper, the inrush current generating mechanism is discussed firstly. Then the model of HVDC system is constructed in PSCAD/EMTDC based on the planned Shanxi-Jiangsu HVDC transmission system. After that, a process simulation, where one pole of HVDC system is in operation while the other pole's transformers are put into operation, is carried out. In this process, this paper studies the influence of fairly large inrush current on the operation of HVDC system. The simulation result shows that the inrush current and sympathetic inrush during energization of the converter transformers cause the fluctuation of operation of HVDC system.

关键词： Surges Circuit faults Surge protection HVDC transmission Power transformers Magnetic cores Magnetic flux

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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, IEMDC 2015

作者： Zhang, Bin Qu, Ronghai Fan, Xinggang Wang, Jin State Key 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)9781479979417

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. © 2015 IEEE.

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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Research on the Filter of Load Side Converter in BDFG Based Ship Shaft Power Generation System

Research on the Filter of Load Side Converter in BDFG Based ...

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Annual IEEE Applied Power Electronics Conference and Exposition

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

ISBN: (纸本)9781467395519

In stand-alone brushless doubly fed generator (BDFG) based shaft power generation system, the output voltage of BDFG is strong influenced by the filter of load side converter (LSC) because of the coupling caused by the stator power winding leakage inductance. In order to eliminate the harmonic of the voltage, the LC-L filter based on the leakage inductance is put forward in this paper. The relationship between the filter parameters and performance, and the limitation of filter parameters for positive damping characteristic without extra active or passive damping has been analyzed. Then the design criterion and steps are presented and a filter based on a 64-kw BDFG shaft power generation system is designed. Finally, the validity of the filter design is verified by experiment.

关键词： stand-alone coupling possitive damping stator power leakage inductance PCC voltage

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Quantitative Comparison of SPM, Spoke-PM and FSPM Machines

Quantitative Comparison of SPM, Spoke-PM and FSPM Machines

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International Conference on Electrical Machines and Systems

作者： Kangfu Xie Ronghai Qu Dawei Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical & Electronic Engineering Huazhong University of Science and Technology China

ISBN: (纸本)9781467388634

Flux switching (FS-) PM machines have gained lots of attentions in recent years, and many topologies have been proposed. In this paper, a quantitative comparison among regular PM machines including 12/10 slot/pole surface-mounted, spoke-PM machines and 12/10, 6/10, 6/13 slot/pole FSPM machines, especially the partitioned-stator one, is presented. Based on the finite element analysis, the electromagnetic performances, such as back-EMF, cogging torque, and torque ripple, are comprehensively investigated. Analysis results show that these FSPM machines are easier to get into saturation than other machines as the current density increases, and the spoke-PM machine exhibits highest torque density when current density exceeds about 6 A/mm2 with relatively low torque ripple and good utilization of magnets.

关键词： Flux switching performance comparison permanent magnet machines spoke-type PM

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Thermal Model of Totally Enclosed Water-Cooled Permanent-Magnet Synchronous Machines for Electric Vehicle Application

Thermal Model of Totally Enclosed Water-Cooled Permanent-Mag...

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IEEE Transactions on Industry Applications

作者： Zhang, Bin Qu, Ronghai Wang, Jin Xu, Wei Fan, Xinggang Chen, Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

Totally enclosed water-cooled permanent magnet machines have been widely applied in electric vehicles due to their advantages of high torque density, high power factor, and strong overloading capacity. However, this type of machine often suffers from extremely high ambient temperature in a very limited space, which may lead to serious faults during operation, such as demagnetization. In order to study the thermal performance in depth, after investigation on the air convection within end-space, this paper presents a thermal model which takes into account the influence of the air temperature within the end-space on the temperature distribution by convection. Combining electromagnetic finite-element analysis with thermal resistance network, the thermal model is established, which is based on the law of heat flux balance in two continuous iterative calculations. Furthermore, computational fluid dynamic technology and experiments are implemented to further validate the proposed thermal model. © 2015 IEEE.

关键词： Electric machine theory Amphibious vehicles Computational fluid dynamics Electric machinery Electric power factor Electric vehicles Finite element method Fluid dynamics Heat convection Heat flux Heat resistance Heat transfer Iterative methods Magnets Permanent magnets Synchronous machinery Thermography (temperature measurement) Vehicles Electric Vehicles (EVs) High torque density Iterative calculation Permanent magnet synchronous machines Permanent magnet machine Thermal Performance Thermal resistance networks Vehicle applications

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Inductance-simulating control for DFIG-based wind turbine to ride-through grid faults

Inductance-simulating control for DFIG-based wind turbine to...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Donghai Zhu Xudong Zou Yong Kang Lu Deng Qingjun Huang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Wuhan NARI Limited Company of State Grid Electric Power Research Institute Wuhan China State Key Laboratory of Disaster Prevention Reduction for Power Grid Transmission and Distribution Equipment Changsha China

ISBN: (纸本)9781467395519

For doubly fed induction generator (DFIG)-based wind turbine (WT), large electromotive force will be induced in the rotor circuit under grid faults, and the rotor side of DFIG is prone to suffering from overcurrent and overvoltage. To mitigate this problem, an inductance-simulating control strategy is proposed to enhance its low-voltage ride through (LVRT) capability. In this method, the rotor side converter (RSC) is controlled to simulating as an inductance. Furthermore, under proper inductance value, both the required rotor voltage and post-fault rotor current can be reduced within the permissible range. In addition, the electromagnetic torque ripple can be effectively eliminated. Finally, the simulation and experimental results clearly demonstrate the effectiveness of the proposed method.

关键词： Rotors Inductance Stators Transient analysis Voltage control Circuit faults

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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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International Conference on Power and Energy, CPE 2014

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

ISBN: (纸本)9781138027824

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 first introduces the probabilistic load flow calculation simulated by the Monte-Carlo method, then based on the OpenMP (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 Monte-Carlo 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. © 2015 Taylor and Francis Group.

关键词： Parallel algorithms

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Design Procedure of Flux Reversal Permanent Magnet Machines

Design Procedure of Flux Reversal Permanent Magnet Machines

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International Conference on Electrical Machines

作者： Yuting Gao Ronghai Qu Dawei Li Jian Li 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)9781509025398

Flux reversal permanent magnet machines (FRPMMs) exhibit many advantages such as simple rotor configuration, high torque density, fast transient response, etc. However, the general design procedure of FRPMMs has not been established. Thus, this paper mainly focuses on developing a design methodology of three-phase FRPMMs. First, the sizing equations are analytical derived based on a magneto motive force (MMF)-permeance model. Then, the influences of several key parameters in the sizing equation including slot-pole combination, airgap radius, electric loading and equivalent magnetic loading on the torque density are analyzed. Moreover, the feasible slot-pole combinations are summarized and the corresponding winding types are recommended in order to maximize the output torque. Besides, the detailed geometric design of stator and rotor are presented. Finally, the proposed design method is verified by 2D finite element analysis (FEA) and experiments on a 12-slot/17-pole FRPMM prototype.

关键词： Design procedure Flux reversal permanent magnet machine (FRPMM) Sizing equation Finite element analysis (FEA)

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