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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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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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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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Detection of Power Quality Disturbances Using Empirical Wavelet Transform and Hilbert Transform

Detection of Power Quality Disturbances Using Empirical Wave...

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2017第三届电气工程与工业工程国际会议

作者： Chen Xiaojing Li Kaicheng Meng Qingxu Cai Delong Luo Yi State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology College of Electronic and Information Yangtze University

With the increasingly penetration of nonlinear loads in the power system, power quality(PQ) has become a significant issue for the power utilities and end users. In order to improve the PQ, the PQ detection is essential. In this paper, a new method for detecting the PQ disturbances via empirical wavelet transform(EWT) and Hilbert(HT) is proposed. Firstly, EWT is applied to the signal for obtaining different modes. Then the instantaneous amplitude and frequency of each mode are calculated by using the HT. By applying it to two stationary signals and two non-stationary signals, the efficiency of the proposed method is evaluated. With no frequency aliasing like the S transform(ST), the proposed method presents more accurate results than the ST.

关键词： Power Quality Disturbances Detection Empirical Wavelet Transform Hilbert

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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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TOV in SMs during MMC riding through zero DC voltage fault: Analysis and suppression

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Journal of engineering 2016年第11期2016卷 386-393页

作者： Hu, Jiabing Lu, Maozeng Lin, Lei State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

A comprehensive analysis and a suppression method of sub-modules' (SMs') transient over-voltage (TOV) in a hybrid modular multilevel converter are presented, consisting of half half-bridge SMs and half full-bridge SMs, during riding through zero DC voltage faults. Analytical expressions of SMs' TOV are initially explored. The relations among transient voltages of SMs in six arms with the same fault moment and those in a fixed arm with different fault moments are deduced. Furthermore, the maximum value of SMs' transient voltages dependent on the fault moment is also presented. A suppression method using common-mode voltage injection is proposed without sacrificing the performance of the converter on riding through zero DC voltage faults. Simulated results are provided to demonstrate the validity of the analytical results and the feasibility of the proposed suppression scheme. © 2016, Institution of engineering and technology. All rights reserved.

关键词： Power quality

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Equivalent circuit model for the insulated core transformer

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Nuclear Science and Techniques 2016年第3期27卷 132-137页

作者： Bo Yang Lei Cao Jun Yang Sheng-Chi Yan Yi-Bin Tao China Electric Power Research Institute Nanjing 210003China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China

The design of the insulated core transformer(ICT)needs to consider the flux leakage *** equivalent linear circuit model is proposed based on the principle of *** is composed by two types of leakage inductances:conventional leakage between windings and special leakage introduced mainly by the insulation *** values of leakage inductances depend on the dimensions of the core,gaps,or windings and the property of magnetic *** circuit allows for quantitatively evaluating influences of ICT internal parameters on its output *** winding self- and mutual inductance matrix is mathematically converted to derive the inductance *** an example,the leakage parameters of a sixstage two-dimensional(2D) ICT are calculated and analyzed.

关键词：等效电路模型变压器绝缘性能影响电感计算对偶原理等效线性磁性材料

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Modeling and Analysis for Practical CT Based on Transient Test and Parameter Identification

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CSEE Journal of Power and Energy Systems 2016年第4期2卷 51-57页

作者： Xianggen Yin Zhe Zhang Xuanwei Qi Gan Li Wenbin Cao Qian Guo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China

In the transient process of power grid faults,the transferring distortion of current transformer(CT)can seriously affect relay protection *** these conditions,it is difficult to analyze the ferromagnetic characteristic of the magnetizing branch in the transient equivalent circuit of *** Jiles-Atherton hysteresis model(J-A model),which is widely used in digital simulations,can accurately describe the hysteresis and saturation process of the core characteristics;however,to acquire the parameters of the J-A model of current transformers in practical use is still a challenging *** this paper,physical tests based on a practical CT and parameter identification are presented to solve the *** basic hysteresis loops of P,PR,and TPY class of practical current transformers are obtained through physical ***,the J-A model parameters are identified using a hybrid genetic/simulated annealing algorithm,based on which transient simulation models of different class CTs are *** effectiveness of the proposed method is verified via dynamic physical simulation tests.A typical accident is analyzed based on these models.

关键词： Current transformer dynamic physical simulation tests J-A model parameter identification transient test

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Research on the influence of live replacement for transformers on the distribution grid and its optimization method

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Journal of Physics: Conference Series 2019年第1期1311卷

作者： Binwu Wang Lidong Li Jian Liu Chunyang Jiang Kun Liu China Electric Power Research Institute Wuhan 430074 Hubei Province China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 Hubei Province China Key Laboratory of Pulsed Power Technology (Huazhong University of Science and Technology) Ministry of Education Wuhan 430074 Hubei Province China State Grid Sichuan Electric Power Research Institute Chengdu 610041 Sichuan Province China

Live replacement of transformers could realize a more convenient way for overhaul and maintenance for this importance equipment in distribution networks. However, a series of harmful impact of transient process may be introduced into the transformer itself and the power distribution system, which would affect accurate measurement and stable operation of the grid. A PSCAD-based simulation model of live replacement for transformers is presented in this paper, and the corresponding method of optimization is also proposed. The scheme presented here is proved to realize live replacement on site, which is significant for improving the level of live maintenance automation and reliability of power distribution systems.

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electromagnetic fields and antenna impedance analysis of an RF ion source at HUST

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AIP Conference Proceedings 2018年第1期2011卷

作者： Peng Zhao Dezhi Chen Dong Li Chen Zuo 1State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology China

Huazhong University of Science and technology (HUST) is developing an RF based negative ion source. Numerical simulations of the 1 MHz RF driver have been performed using ANSYS HFSS. Differing from conventional inductively coupled plasma (ICP) source simulations, which exclude Faraday screen (FS) for simplifying analysis, our simulation model contains FS and employs a complete 3D model for reproducing the realistic electromagnetic fields in the driver. It is found that the FS suppresses effectively the axial electric field, hence diminishes the capacitive coupling between the antenna and the plasma. The simulations without and with plasma have also been performed by approximating the plasma as a homogeneous electrically conducting medium. It is found that the existence of plasma further enhances the azimuthal electric field in the plasma volume, which enhances the inductive coupling between the antenna and plasma. The equivalent antenna impedance loaded without and with plasma has been analysed. As the plasma conductivity increases, the antenna inductance decreases, while the antenna resistance firstly rises and then declines, which indicates that the RF power transfer gets obstructed at high input power and high plasma density. The measured antenna impedance at no plasma is much closer to the simulation result in the model containing FS rather than excluding FS, which somehow verifies the validity of this model.

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