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检索条件"机构=State Key Lab of Advanced Electromagnetic Engineering and Technology"

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Stability of DC-Link Voltage as Affected by Phase Locked Loop in VSC when Attached to Weak Grid

Stability of DC-Link Voltage as Affected by Phase Locked Loo...

引用

IEEE Power and Energy Society General Meeting

作者： Pian Zhou Xiaoming Yuan Jiabing Hu Yunhui Huang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

This paper analyzes DC-link voltage stability as affected by phase locked loop (PLL) in voltage source converters (VSC) when connected to weak grid. PLL has an impact on power transferred to the grid from VSC due to active/reactive power current regulation aligned to PLL reference frame. DC-link voltage, directly related to power flows, is then affected by PLL dynamics. Interactions between PLL and DC-link voltage control are more serious in weak grid where terminal voltage, as input of PLL, becomes susceptible to power flow variations in VSC. In this paper, a system with VSC connected to infinite bus via grid impedance is studied for operating in inverter mode. Deteriorated DC-link voltage small signal stability is presented with quick PLL response as short circuit ratio (SCR) becomes significantly low. It may be possible for PLL to improve the DC-link voltage large signal stability due to its effect on power transfer.

关键词： Phase locked loops Voltage control Power system stability Stability analysis Power conversion Circuit stability

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Investigate the influence of magnetic bridge design on mechanical strength and electromagnetic characteristics in high speed IPM machines

Investigate the influence of magnetic bridge design on mecha...

引用

International Conference on Electrical Machines and Systems (ICEMS)

作者： Jing Rao Ronghai Qu Jimin Ma Wei Xu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Interior permanent magnet (IPM) machines is a popular solution of high speed traction motor, since its advantages such as high efficiency, high power density, wide constant power range and so on. However, when the diameter of rotor of IPM machine is big enough, and the machine works too quickly, IPM machine may encounter too huge centrifugal force which will cause irreversible deformation in the thinner part of rotor. In this paper, the influence of magnetic bridge design on the mechanical stress and electromagnetic characteristics are investigated. During the investigation, the total width of bridges is constant, and with the variations of number, width, direction and position of bridges, the stress and electromagnetic characteristics are analyzed in details. By comprehensive simulations, the optimized design can have 5% stress less than conventional ones, and without the obviously negative effect on back-EMF and torque. However, unreasonable optimization will make the mechanical problem more seriously. In general, the bridge closer to the center of the magnet pole in the IPM machines will bear the centrifugal force more effectively.

关键词： Bridges Stress Magnetomechanical effects Rotors Magnetic separation Magnetic flux leakage Torque

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Design, characteristic analysis of PM wind generator based on SMC material for small direct-drive wind energy conversion system

Design, characteristic analysis of PM wind generator based o...

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International Conference on Renewable Energy Research and Applications (ICRERA)

作者： Pedram Asef State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University Of Science and Technology Wuhan China

The objective of this paper is to provide a Design Of Low-Speed Permanent Magnet Synchronous Wind Generator (LSPMWG) by Conventional Inner-Rotor Radial-flux (CIRRF) topology to small direct-drive wind energy conversion system (SDWECS). Finite element analysis (FEM) was carried out to obtain magnetic flux density, Air-gap flux distribution versus Angles, Eddy-Current Loss, Hysteresis Loss, Anomalous Loss, Torque, and Electrical Energy Efficiency (EEE). Comparison of LSPMWG based on the latest Soft Magnet Powder Composite (SMC) with advantages and disadvantages are highlighted in comparison a conventional Steel laminated in this research paper. Besides, to ensure SMC-5P X-SOMALOY 700HR features of magnetic properties electrical the measurements must be done on standard geometry. the results present the best-suited materials to enhancing EEE of LSPMWG.

关键词： Materials Magnetic hysteresis Steel Magnetic flux Powders Wind energy Core loss

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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...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Jiuqing Cai Changsong Chen Shanxu Duan Dongdong Yang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

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.

关键词： Batteries Microgrids Centralized control Power conditioning Inverters Voltage control

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The optimal allocation of D-SMES for enhancing transient stability of power system

The optimal allocation of D-SMES for enhancing transient sta...

引用

IEEE Workshop on advanced Research and technology in Industry Applications (WARTIA)

作者： Shu Wang Yuejin Tang Jing Shi Yajun Xia Kang Gong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479969906

This paper proposes a method to determine the optimal allocation of distributed superconducting magnetic energy storage system (D-SMES) capacity for enhancing the transient stability of power system. A kind of multi-objective evolutionary algorithm (MOEA) is adopted to find the optimal allocation when a certain number of D-SMES devices are deployed in the certain location of the system. The index of trajectory of generator speed after large disturbance is adopted to indicate the stability of power system. Then, the simulation with the Western Systems Coordinating Council (WSCC) three-machine nine-bus power system is evaluated.

关键词： Power system stability Stability criteria Resource management Evolutionary computation Indexes Transient analysis

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Investigation of multiphase modular stator SPM with fault tolerance

Investigation of multiphase modular stator SPM with fault to...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Huilin Kang Libing Zhou Jin Wang Xi Peng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479951635

Multiphase modular stator permanent magnet machine (MSPM) features fractional slot concentrated windings, negligible mutual phase inductance and thus the high fault tolerance. This paper intends to investigate the fault tolerance of a five phase 20-slot 22-pole MSPM with shaped permanent magnets. The faulty modes include one phase open-circuited, two non-adjacent phases open-circuited, two adjacent phases open-circuited, and one phase short-circuited. Optimal current control strategy is studied and applied to achieve maximum average torque without regard to torque ripple. Finite element analysis is performed to simulate the MSPM with all of the mentioned faulty conditions. Torque characteristics of the MSPM under healthy and faulty modes show that, the MSPM still possesses satisfactory electromagnetic performances in case of the faulty modes.

关键词： Torque Fault tolerance Fault tolerant systems Windings Circuit faults Inductance Current control

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Preparation and properties of YAG powder and porous ceramics

Preparation and properties of YAG powder and porous ceramics

引用

2014 Dianchi advanced Materials Forum

作者： Zhao, Wen Bo Liang, Xin Hu, Fa Mei You, Liang Liang Ma, Bo Feng Wang, Ruo Lan Liu, Hong Ying Yang, Guo Sheng Tan, Bin Song, Jie Guang Wang, Fang Chen, Fei School of Mechanical and Materials Engineering Jiujiang University Jiujiang China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

ISBN: (纸本)9783038353348

Yttrium aluminum garnet (YAG) with a chemical composition of Y3Al5O12 is an important advanced structural and functional material. The preparation conditions were a pH of 9, a titration rate of lOml/minute and a reaction time of 60 minutes. The analysis shows that the YAG precursor does not have an obvious characteristic crystalline diffraction peak, the characteristic diffraction peak of YAG was found after the calcination of the YAG precursor at 1100°C for 1 hour, the characteristic diffraction peak of YAG is strong, which indicates that the YAG crystalline phase is integrated and pure. The pore microstructure of porous YAG ceramics marked differed with an increase in the sintering temperature, the compress strength of porous YAG ceramics is increased with an increase in the sintering temperature, the compress strength shows the opposite rule with the porosity, which indicates the mechanical properties of materials are effected with the densifìcation effect of materials. © (2014) Trans Tech Publications, Switzerland.

关键词： Yttrium aluminum garnet

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A comparison of contact erosion for two types arcing contact of SF6 circuit breakers in making process

A comparison of contact erosion for two types arcing contact...

引用

IEEE Holm Conference on Electrical Contacts

作者： Can Ding Junjia He Xichao Yuan Zhao Yuan Yuan Pan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479960699

The paper presents the results of making tests of arcing contact made from copper-tungsten (Cu-W) composites containing different contents of tungsten: 80% and 85%. The Cu-W arcing contacts are tested in a SF 6 circuit breaker under the condition that the making velocity is 7m/s and the current peak is 18kA. The arcing time of every making test is measured. The electrical properties of the contacts are tested every 20 making operations and the mass loss is investigated after 100 operations. It is determined that the two types of Cu-W contacts have different electrical properties, in other words, their efficacy can be determined for the making as arcing contacts for an SF 6 circuit breaker.

关键词： Contact resistance Sulfur hexafluoride Materials Circuit breakers Surface resistance Voltage measurement

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Study of multiphase modular stator SPM based on phase variable model

Study of multiphase modular stator SPM based on phase variab...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Xi Peng Libing Zhou Jin Wang Huilin Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479951635

Multiphase modular stator surface-mounted permanent magnet machine(MSPM) features non-sinusoidal back electromotive force. As a result, the d-q model of MSPM is not accurate enough due to the ignorance of space harmonics. Phase variable model is able to be used to perform simulation of electric machine with same accuracy level as the full finite element(FE) model with much less simulation time. This paper aims to figure out the difference between the MSPM with conventional permanent magnet(PM) and shaped PM, and the phase variable model is adopted. Rotor-position-dependent variables including inductance, back electromotive force and cogging torque are obtained from FE model. Apparent inductance and incremental inductance are respectively applied to take the saturation effect of the ferromagnetic materials into account. Simulation with phase variable model of MSPM is performed using SIMULINK, and the results show that the MSPM with shaped PM has a better torque characteristic.

关键词： Torque Inductance Harmonic analysis Forging Windings Integrated circuit modeling Stators

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The complex ratio transformer model and its application in magnetic resonant WPT

The complex ratio transformer model and its application in m...

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IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific)

作者： Jinbo Zhao Hao Feng Tao Cai Shanxu Duan Qian Dai State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Several Physical models for describing magnetic resonant WPT(wireless power transmission) include coupling-model theory, the leakage inductance model and the mutual inductance model. Among these models, mutual inductance model separates the magnetic coupling coils from each other, simplifying the circuit analysis. But mutual inductance model treats the impact of the secondary side on the primary side as vaguely defined reflective impedance. To equivalently transforming the secondary branch to the primary side, the complex ratio transformer model is established, providing an intuitive physical picture in power transmission process, magnetic resonance (MR) and frequency splitting phenomenon. Finally, the corresponding experimental validation was presented.

关键词： Integrated circuit modeling Magnetic resonance Impedance Inductance Magnetic circuits Couplings

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