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Review of off-line synchronous inductance measurement method for permanent magnet synchronous machines

Review of off-line synchronous inductance measurement method...

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

作者： Yuting Gao Ronghai Qu Yu Chen Jian Li Wei Xu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

In permanent magnet synchronous machines (PMSMs), the synchronous inductances have important influences on both steady state and dynamic performances, such as designing control strategies, predicting torque and flux-weakening capabilities. However, standard procedures for the inductance measurement have not been established yet. This paper presents a comprehensive analysis and comparative study of the various off-line methods that can be used to measure the inductances based on their accuracy, experimental setup and complexity. These approaches can be classified into three main categories: load test, DC standstill test and AC standstill test. Moreover, with the employment of finite element analysis (FEA), qualitative comparisons are done among these methods.

关键词： Inductance Rotors Current measurement Stators Voltage measurement Inductance measurement Accuracy

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Study on graphite-electrode gas switch applied for pulsed power supply with 700 kA peak current

Study on graphite-electrode gas switch applied for pulsed po...

引用

IEEE Symposium Power Modulator

作者： Bin Yu Fuchang Lin Yi Liu Lee Li Yunlong Liu Liqiu Jiang Yafeng Ge State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

According to the latest requirements of the advanced laser system, a 700 kA gas switch with graphite electrodes for pulsed power supply module has been developed. The paper describes the design, construction and testing of the high-current gas switch. Through the analysis of the electrodes erosion of different materials, high-density graphite is found to be suitable for electrodes of the gas switch with high current and charge transfer. A two-electrode gas switch with FRP rods and an updated gas switch using hoop type fastening method have been developed, the magnetic switch is used in the trigger circuit. Experimental results show that both the switches can conduct the current of over 700 kA and the charge transfer of more than 500 coulomb per shot.

关键词： Switches Electrodes Graphite Switching circuits Testing Capacitors Magnetic tunneling

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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...

引用

IEEE Energy Conversion Congress and Exposition

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

ISBN: (纸本)9781479957774

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.

关键词： Eccentricity FSCW Radial force mode SPM UMP Vibration and noise

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Research on comprehensive assessment index system for transmission network planningalternatives

Research on comprehensive assessment index system for transm...

引用

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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Study of direct-drive permanent magnet synchronous generators with solid rotor back-iron and different windings

Study of direct-drive permanent magnet synchronous generator...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Shaofeng Jia Ronghai Qu Jian Li Xinggang Fan Meng Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479951635

Direct-drive Permanent Magnet Synchronous Generators (DDPMSG) are gaining increasingly more attention and application for wind power. This paper presents a comparison among the performance of DDPMSG equipped with three commonly used winding types, integer-slot distributed winding (ISDW), fractional-slot concentrated winding (FSCW) and fractional-slot distributed winding (FSDW). Loss distribution, performance under short circuit fault and temperature rise are investigated and compared using finite element analysis (FEA). The conclusion is helpful for machine designers to choose the proper winding type.

关键词： Windings Rotors Power capacitors Copper Stator windings Solids

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Effect of Reactive Power Control on Stability of DC-Link Voltage Control in VSC Connected to Weak Grid

Effect of Reactive Power Control on Stability of DC-Link Vol...

引用

IEEE Power and Energy Society General Meeting

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

In this paper, effect of reactive power control (RPC) on the stability of DC-link voltage control (DVC) in voltage source converter (VSC) when attached to weak grid is investigated. In weak grid, disturbance in DVC leads variations in terminal voltage and makes RPC respond. In turn, RPC contributes to power output variation and influences DVC. RPC behaves as a lagging regulator for DVC and results in lagging active power output. Referencing to stability analysis theory for synchronous machine, damping and restoring components for DVC are proposed. Stability of DVC affected by RPC is analyzed by evaluating the influence of RPC on damping and restoring components. Additional damping component provided by RPC will become smaller with reduction of grid strength. In addition, when the bandwidth of RPC is close to that of DVC, effect of RPC on DVC is in maximum extent. The time-domain model of 1.5-MW full-scale wind turbine was built in Matlab/Simulink and simulation results validate the analysis above.

关键词： Voltage control Damping Power system stability Stability analysis Power conversion Bandwidth

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Influence of pole ratio and winding pole numbers on the performances and optimal parameters of the surface permanent magnet vernier machines

Influence of pole ratio and winding pole numbers on the perf...

引用

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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An optimized method based on maximum torque-per-ampere control for permanent magnet synchronous motor

An optimized method based on maximum torque-per-ampere contr...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Le Yang Kexun Yu Qilin You Qingming Xin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479951635

The paper presents an optimized control method of permanent magnet synchronous motor (PMSM) based on maximum torque-per-ampere (MTPA). Since it exists a complex nonlinear relation between the d, q axis current and the torque in PMSM, an optimized curve-fitting method is introduced to simplify the nonlinear equations of d, q axis and the toque. Based on the approximation algorithms, a new speed-current double close-loop control model is established and comparing with the traditional I d =0 and MTPA control, it balances stator current and responses quickly, and thereby improves system efficiency.

关键词： Torque Mathematical model Stators Control systems Permanent magnet motors Equations AC motors

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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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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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