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Improved Hybrid Method to Calculate Inductances of Permanent Magnet Synchronous Machines with Skewed Stators Based on Winding Function Theory

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Chinese Journal of Electrical engineering 2016年第1期2卷 52-61页

作者： Yuting Gao Ronghai Qu Dawei Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

An improved hybrid method combining two dimensional(2D)finite element analysis(FEA)and the analytical method is put forward to calculate the stator winding inductance and synchronous inductance influenced by stator skewing *** on winding function theory(WFT),the improved method proposes two factors to describe variable inductances along the stator skewing *** simulations are then performed on three interior permanent magnet synchronous machines(IPMSMs),one normal and two skewed machines(half slot and one slot pitch skewing respectively).Extensive experiments are conducted on relevant prototypes with good ***,analysis and comparisons are made as to the influence of different skewing angles on the inductances and torque-speed *** is found that Ld increases and Lq decreases by skewing,leading to the reduction of the rotor saliency and maximal torque capability,but increase of the flux weakening capability.

关键词： Finite element analysis(FEA) inductances permanent magnet synchronous machine(PMSM) skewing winding function theory(WFT).

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Comparative thermal analysis of IPMSMs with integral-slot distributed-winding (ISDW) and fractional-slot concentrated-winding (FSCW) for electric vehicle application

Comparative thermal analysis of IPMSMs with integral-slot di...

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2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017

作者： Fan, Xinggang Zhang, Bin Qu, Ronghai Li, Jian Li, Dawei Huo, Yongsheng 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)9781509042814

Fractional-slot concentrated-winding (FSCW) interior permanent magnet synchronous motors (IPMSMs) have been attracting considerable attention due to their high power density, high efficiency, short end-winding, high slot fill factor, low cogging torque, excellent flux-weakening and fault tolerance capability. However, compared to integer-slot distributed-winding (ISDW) IPMSMs, the key challenge of using FSCW configurations is the significant rotor losses, particularly at high speed. To figure out the IPMSM with which winding configuration is more suitable for electric vehicle (EV) application, the thermal behaviors of four IPMSMs with ISDW, single-, double-and four-layer FSCWs are comprehensively and comparatively investigated in this paper. Firstly, electromagnetic design and loss analysis of the four IPMSMs are investigated to meet the EV traction motor requirements. Secondly, finite element method (FEM) is employed to investigate the thermal performance of the IPMSMs under different rotational speeds and torque overload capacities. Besides, the influence of magnet segmentation on the temperature is also taken into account. Finally, some conclusions are drawn for the suitable winding configuration selection and the PM traction motor design. © 2017 IEEE.

关键词： Thermoanalysis

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PLL effect on subsynchronous torsional interaction with VSC-HVDC

PLL effect on subsynchronous torsional interaction with VSC-...

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6th International Conference on Renewable Power Generation

作者： Hu, Rong Zhu, Jianhang Liu, Hongtao Zhou, Huafeng Chen, Jiale Electric Power Dispatching Control Center of China Southern Power Grid Co. Ltd Guangzhou Guangdong510623 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

Subsynchronous torsion interaction (SSTI) between synchronous generator (SG) and high-voltage direct current (HVDC) is one of the main issues for the safe and stable operation of power systems. Compared with SSTI between SGs and line-commutated-converter (LCC)- HVDC, which has been well studied in the past, SSTI between SG and voltage source converter (VSC)-HVDC can also occur. Currently, the studies of SSTI between SG and VSC-HVDC mainly focus on the dynamics of alternating current controller of VSC-HVDC, and it is sufficient to study the electrical damping when evaluating the risk for SSTI. However, the influence of phase-locked loop (PLL) and line impedance between SG and VSC-HVDC is ignored. Here, the effect of PLL dynamics on SG electrical damping is focused. As considering the difference of rotational frame between SG and VSC-HVDC in the current loop timescale, which is caused by the line impedance Xg, the mathematical model of dynamic effect of PLL on the electrical damping of SG is derived. Moreover, the optimised design of PLL in considering line impedance conditions is proposed, and it can reduce or eliminate the negative electrical damping in subsynchronous frequency region of SG to reduce the risk of SSTI between SG and VSC-HVDC. Finally, the validity of the analysis and proposed optimisation principle is verified by simulation results. © 2017 Institution of engineering and technology. All rights reserved.

关键词： Phase locked loops

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Finite set model predictive MTPA control with VSD method for asymmetric six-phase PMSM

Finite set model predictive MTPA control with VSD method for...

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2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017

作者： Ye, Donglin Li, Jian Qu, Ronghai Lu, Hanxiao Lu, Yang 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)9781509042814

This paper investigated and compared two types of modified model predictive control methods with finite set for six-phase PMSM MTPA control. The first one has conventional cascaded speed and current controller loops where the PI current loop is replaced with a MPC control loop. The second method uses one MPC controller in place of conventional cascaded loops for both speed and current control. The MPC method is adopted for fast current response and the ability of dealing with multi-variables. Therefore, partial current harmonics in xy sub-plane can be suppressed with the cost function according to vector space decomposition theory. By designing the cost function, the MTPA operation can be implemented. © 2017 IEEE.

关键词： Model predictive control

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Sub-synchronous torsional interaction with VSC-HVDC affected by feed-forward compensations in current controllers

Sub-synchronous torsional interaction with VSC-HVDC affected...

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6th International Conference on Renewable Power Generation

作者： Zhou, Huafeng Chen, Jiale Liu, Qixing Hu, Yaping Zhu, Jianhang Electric Power Dispatching Control Center of China Southern Power Grid Co. Ltd Guangzhou Guangdong510623 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

The sub-synchronous torsional interaction (SSTI) behaviour between turbine-generator units and the high-voltage direct current (HVDC) systems has been a vital research content in power systems. In the past, the characteristics of SSTI with line-commutated-converter (LCC)-HVDC have already been well studied. With the development of voltage source converter (VSC)-based HVDC, some researchers have found that different control parameters of the converter have an impact on the electrical damping of the connected synchronous generator system. However, the existing results did not show the specific mechanism of SSTI. In this study, SSTI with VSC-HVDC affected by voltage feed-forward (VVF) compensations in the AC current controllers is investigated. The effects of the asymmetric VVF in both dand q-Axes on electrical damping are paid special attention. First, a general output impedance model of VSC-HVDC concentrated on AC current controllers is developed. Then the influence of compensation factor (kd/q) and filter bandwidth (αfd/q) on the bandwidth of the converter and the electrical damping is studied. Finally, an SSTI suppression scheme based on the former analysis is given. Simulation studies are carried out in PSCAD/EMTDC, and simulated results validate the analytical results and proposed suppression scheme. © 2017 Institution of engineering and technology. All rights reserved.

关键词： Bandwidth

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A New Technique for Modeling and Analysis of electromagnetic Interference in Three-Phase Inverter System

A New Technique for Modeling and Analysis of Electromagnetic...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Wu Zhou Xuejun Pei Yong Kang Yangxiao Xiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology (HUST) Wuhan Hubei China

A novel frequency-domain EMC modeling technique is proposed to predict the conducted electromagnetic interference (EMI) in a three-phase inverter system. The proposed model can predict the conducted emissions up to 30MHz. Moreover, the proposed model can analysis noise source and the noise propagation respectively. Based on the model, the influence of the IGBT stray capacitance on total EMI noise are analysed. In addition, it is found that the load current can influence the total EMI noise on LISN by affecting the DM noise source. The analysis is confirmed with simulation and experiment results.

关键词： Integrated circuit modeling electromagnetic interference Frequency-domain analysis Insulated gate bipolar transistors Inverters Mathematical model Analytical models

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Magnetic stress and vibration analysis of the permanent magnet assisted synchronous reluctance machines

Magnetic stress and vibration analysis of the permanent magn...

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2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017

作者： Lu, Yang Li, Jian Qu, Ronghai Sun, Jianbo Ge, Meng Xu, Hongwei 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)9781509042814

This paper studies the magnetic stress and vibration characteristic of the permanent magnet assisted synchronous reluctance machine (PM-SynRM). Firstly, the frequency and spatial orders of radial stress are investigated by analytical equations. Then, two PM-SynRMs are designed, and their open-circuit and armature magnetic stresses are calculated by finite element method (FEM) and compared with the analysis results. The magnetic stress distribution along stator tooth is studied and vibrations under magnetic stress of different frequency are investigated. A general design rule for selecting stator and rotor slot number of PM-SynRMs is first given in this paper. © 2017 IEEE.

关键词： Vibration analysis

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Harmonic current suppression control strategy for hybrid excited vernier PM machines

Harmonic current suppression control strategy for hybrid exc...

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2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017

作者： Yu, Zixiang Kong, Wubin Jia, Shaofeng Jiang, Dong Qu, Ronghai 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)9781509042814

Recently, a novel hybrid excited vernier permanent magnet machine (HE-VPM) is proposed. The proposed machine is with stator located PMs, and concentrated armature windings. The current waveforms of the armature windings are sinusoidal with DC bias, as the injected DC biased current can weaken or enhance the exciting fields at high/low speed. Due to the characteristics of double salient structure, a massive amount of back-EMF harmonics in phase windings will appear when the machine is operating, and the DC flow path will lead to current waveform distortion in phase windings, result in torque ripple and influence the efficiency of the motor. By analyzing the mathematical equations in dq0-Axis, a harmonic current suppression control strategy for HE-VPMs is proposed. The control strategy produces the corresponding voltage compensation in dq-Axis, counteract with the back-EMF harmonics to achieve the purpose of eliminating the circulating harmonic current. Finally, the experimental results verified that the proposed control strategy can suppress the harmonic current in phase windings effectively. © 2017 IEEE.

关键词： Permanent magnets

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A novel flux reversal PM Machine with Halbach array magnets in stator slot opening 20

A novel flux reversal PM Machine with Halbach array magnets ...

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20th International Conference on Electrical Machines and Systems, ICEMS 2017

作者： Xie, Kangfu Li, Dawei Qu, Ronghai Gao, Yuting Pan, Yuan 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)9781538632468

Flux reversal permanent magnet (FRPM) machine, with magnets mounted on or inserted into the stator, is favorable for the direct drive applications. In this paper, a novel FRPM machine with Ralbach array magnets in stator slot opening is proposed. While the magnets are moved to the slot opening, effective airgap length is reduced and slot area is enlarged. The analysis results indicates that the torque density of proposed machine is 2.3 times that of the conventional FRPM machine with the same magnet usage. And for the same torque specification, the power factor of proposed machine is 0.79, while that of the conventional one is 0.58. © 2017 IEEE.

关键词： Permanent magnets

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An Improved Method of the Energy Loss Calculation Considering the Volatility of Wind Power Generation

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Energy and Power engineering 2017年第4期9卷 281-291页

作者： Bo Ruan Tingting Hou Yu Li Zhen Mei Jun Huang Research Institute of Economics and Technology Hubei Electric Power Company Limited Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science & Technology Wuhan China

The energy loss of the power grid is one of the key factors affecting the economic operation of power systems. How to calculate the electric energy consumption accurately will have a great influence on the planning, operation and management of the power grid. Currently there is a mountain of theoretical methods to calculate the line loss of the power system. However, these methods have some limitation, such as less considering the volatility of wind power resources. This paper presents an improved method to calculate the energy loss of wind power generation, considering the fluctuations of wind power generation. First, data are collected to obtain the curve of the typical daily expected output of wind farms for one month. Second, the curve of the typical daily expected output are corrected by the average electricity and the shape factor to obtain the curve of the typical daily equivalent output of wind farms for one month. Finally, the power flow is calculated by using typical daily equivalent output curve to describe the energy loss for one month. The results in the 110 kV main network show that the method is feasible.

关键词： The Energy Loss of the Power Grid Wind Power Generation Shape Factor the Curve of the Typical Daily Equivalent Output Power Flow Calculation

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