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An Engineering Design of a 2MW direct-drive Permanent-magnet Wind-power Generation System

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An Engineering Design of a 2MW Direct-drive Permanent-magnet...

Multi-objective design optimization of a large-scale directdrive permanent magnet generator for wind energy conversion systems

第11届国际电机与系统学术会议

作者： Shoudao Huang~1 Xin Long~2 Luoqiang Cai~2 Keyuan Huang~1 and Jian Gao~1 1 College of Electrical &Information Engineering Hunan University Changsha China 410082 2 Xiangtan Electrical Machine Ltd.Co. Xiangtan China 413200

＜正＞With rapid development of the power semiconductor devices,direct-drive permanent magnet synchronous generator （PMSG） has shown the significant advantages for its high efficiency,reliability,and becomes an attractive choice for variable-speed wind power generation,MW class PMSG system with larger capacity,higher power density is an important trend. This paper describes the engineering design of the domestic first 2MW direct-drive PMSG system,including optimal machine design,converter topology choosing and its *** generator injects the power to the grid through two fully controlled back-to-back PWM converters that are parallel connected as master-slave structure.A load current sharing control strategy is presented for the parallel *** experimental results are given to illustrate the performance of the actual system.

关键词： direct-drive PMSG engineering design back-toback converter parallel connection

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Frontiers in Energy 2014年第2期8卷 182-191页

作者： Arash Hasssanpour ISFAHANI Amirhossein Haji-Seyed BOROUJERDI Saeed HASANZADEH Everette Energy LLC Dallas 75225 USA Faculty of Electrical and Engineering Islamic Azad University Islamshahr Branch Tehran 33147-67653 Iran Facuty of Electrical and Computer Engineering Qom University of Technology Qom 1519-37195 Inan

This paper presents a simukaneous multi- objective optimization of a direct-drive permanent magnet synchronous generator and a three-blade horizontal-axis wind turbine for a large scale wind energy conversion system. Analytical models of the generator and the turbine are used along with the cost model for optimization. Three important characteristics of the system i.e.,the total cost of the generator and blades, the annual energy output and the total mass of generator and blades are chosen as objective functions for a multi-objective optimization. Genetic algorithm （GA） is then employed to optimize the value of eight design parameters including seven generator parameters and a turbine parameter resulting in a set of Pareto optimal solutions. Four optimal solutions are then selected by applying some practical restrictions on the Pareto front. One of these optimal designs is chosen for finite element verification. A circuit-fed coupled time stepping finite element method is then performed to evaluate the no-load and the full load performance analysis of the system including the generator, a rectifier and a resistive load. The results obtained by the finite element analysis （FEA） verify the accuracy of the analytical model and the proposed method.

关键词： permanent magnet synchronous generator wind turbine direct-drive multi-objective optimization,

Design concept development of a variable magnetization motorwith improved efficiency and controllable stiffness for roboticapplications

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Science China(Technological Sciences) 2019年第1期62卷 39-46页

作者： BAI Kun ZHU Lang YUAN Mi LEE Kok-Meng State Key Lab of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Woodruff School of Mechanical Engineering Georgia Institute of Technology

A variable magnetization(VM) motor by incorporating magnets that can be flexibly configured with variable magnetization process is proposed to meet the emerging requirements on motor efficiency and actuator compliance in robotic applications. A generalized spin torque model is established which provides a relationship between the motor torque and two different types of motor inputs, the current inputs and the magnet magnetizations. Avariable magnetization process is proposed based on the study of the hysteresis properties of the magnetic materials and the design criteria for implementing the variable magnetization process with current pulses are established. The feasibility of the variable magnetization is validated with experimental data and the motor functions and performances are numerically demonstrated and evaluated. The results show that the VM motor can maintain high efficiency by switching between two actuation modes. Controllable stiffness at different equilibria can be also achieved with the VM motor with instantaneous magnetizing current pulses.

关键词： compliant actuators direct-drive motors variable stiffness motors variable magnetization motors

Design methodology of permanent magnet generators for fixed-pitch tidal turbines with overspeed power limitation strategy

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Journal of Ocean Engineering and Science 2020年第1期5卷 73-83页

作者： Sofiane Djebarri Jean Frédéric Charpentier Frank Scuiller Mohamed Benbouzid ECAM Lyon LabECAMF69005 LyonFrance French Naval Academy IRENav EA 363429240 BrestFrance University of Brest UMR CNRS 6027 IRDL29238 BrestFrance Shanghai Maritime University 201306 ShanghaiChina

This paper deals with a design methodology of permanent magnets(PM)generators used for fixed-pitch tidal turbines in a marine renewable energy *** the case of underwater turbines,fixed-pitch tidal turbines could be very attractive and interesting to reduce maintenance operation by avoiding using such a complex electromechanical system for *** this technological case,one of the main control challenges is to ensure power limitation at high tidal current *** control mode can be achieved using the generator *** this context,this paper proposes an original and systemic design methodology to optimize the generator design taking into account the tidal turbine power limitation for high tidal currents velocities.

关键词： Tidal turbine Fixed-pitch turbine direct-drive PM generator Design methodology Flux-weakening power limitation.

Torque analysis for double-stator permanent-magnet motor

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Journal of Harbin Institute of Technology(New Series) 2002年第4期9卷 411-414页

作者：柴凤程树康崔淑梅 Dept. of Electric Engineering

In addition to the characteristics of a conventional motor, a novel direct-drive double-stator permanent-magnet brushless motor proposed can operate in the state of either a generator or a motor as appropriate. Through numerical calculation and analysis, the output torque of double-stator permanent-magnet brushless motor of the same volume as the traditional machine is discussed, and the reduction of torque ripple by using the structure features of this motor is investigated. The results indicate that lower torque ripple under the condition of ideal effective torque can be obtained by the rational design of motor. The prototype motors tested show that this kind of motor structure has a higher power density.

关键词： direct-drive motor double-stator permanent-magnet motor

A Novel Axial Flux Stator and Rotor Dual Permanent Magnet Machine

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CES Transactions on Electrical Machines and Systems 2017年第2期1卷 140-145页

作者： Yunchong Wang W.N.Fu Xingjian Li Hong Kong Polytechnic University Hung HomKowloonHong KongChina Xi'an Jiaotong Liverpool University SuzhouJiangsuChina

A novel structure of axial flux stator and rotor dual PMs Vernier machine is presented as an effective option for high torque-density direct-driven *** key is to locate PMs on both sides of rotor and *** dual PMs,this proposed machine with a novel structure generates an improved torque per armature current at low *** is very suitable for direct drive applications with limited space such as the in-wheel electric vehicle(EV)*** theory of the structure with PMs on both sides is analyzed *** structure and operation principle of machine are introduced and the steady and steady performance of machine is analyzed and verified with time-stepping finite element method(TS-FEM).

关键词： direct-drive finite element method flux modulation high torque density permanent magnets

Analysis on Effect of Parameters of Different Wind Generator on Power Grid Transient Stability

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Energy and Power Engineering 2013年第4期5卷 363-367页

作者： Zhi-wei Wen Li Ding Shi-en He Beijing Electric Research Institute of Economics and Technology Beijing China Gansu Electric Power Research Institute Lanzhou China Wind Power Technology Center of Gansu Electric Power Corporation Lanzhou China

To analyze the factors which affecting transient stability of power system, the dynamic model of doubly-fed induction generator and direct-drive PM synchronous generator has been built using PSCAD. Impact of different wind farm integration on grid typically in China has been presented. The influence of the variations of transient reactance, negative sequence reactance and rotary inertia on critical clearing time of power system transient stability is analyzed by time-domain simulation. Mixture operation of DFIG and PMSG to optimize the stability of system has been analyzed firstly. The digital simulation results show that doubly-fed induction wind turbines is a better choice to meet the requirement of system instability due to large wind farm integration in comparison with direct-drive PM synchronous wind turbines. With a rather large rotary inertia, the proper ratio of direct-drive PM synchronous wind turbines used in wind farm could be comprehensive planning by optimized the stability of system. Analysis of this paper should be provided as academic reference for improving design of wind farm system.

关键词： Wind Farm Doubly-fed Induction Generator direct-drive PM Synchronous Generator Parameter

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600V GaN隔离栅驱动关键技术研究

600V GaN隔离栅驱动关键技术研究

作者：胡黎电子科技大学

学位级别：硕士

在600 V的高压电源应用端(PFC和LLC),硬开关模式下开关损耗非常大,主要采用软开关和谐振技术来降低开关损耗。传统的解决方案一般采用Cool MOS,但由于Cool MOS体二极管的存在以及大的Q和Q,反向恢复一直解决不好,EMI差,功率损耗大,在软... 详细信息

在600 V的高压电源应用端(PFC和LLC),硬开关模式下开关损耗非常大,主要采用软开关和谐振技术来降低开关损耗。传统的解决方案一般采用Cool MOS,但由于Cool MOS体二极管的存在以及大的Q和Q,反向恢复一直解决不好,EMI差,功率损耗大,在软开关模式的实现中开关频率受限制。相比于Si器件,GaN器件输出电容C随V变化的非线性小,在同样器件导通电阻的前提下可以获得更小的输出电荷Q;同时由于更小的Q,基于GaN的软开关应用能够实现更短的谐振周期,减小谐振变换器的导通损耗,达到更高的开关频率和功率密度,特别适合未来电源模块的小型化发展趋势。目前100 V50 V电压等级的增强型GaN功率器件已有商用产品,实现该功能的主流技术方案是Cascode和p-GaN。但在实际应用中仍然面临诸多挑战。Cascode方案由于其互联的寄生参数以及Si体二极管的存在,对器件可靠性造成极大威胁。p-GaN由于V和V耐压低,器件工作安全余量小,在影响系统可靠性的同时增加了驱动IC和系统设计的难度。因此,在高压高效的应用中耗尽型GaN器件被认为更具吸引力,本文基于耗尽型GaN器件,与传统的Cascode-drive驱动耗尽型器件方案对比,提出一种被称为direct-drive的驱动方案。对于典型的半桥功率拓扑应用,在600 V的条件下,开关节点引起的dv/dt高达200 V/ns:1.高的dv/dt引起的共模噪声电流会对逻辑输入信号带来极大的串扰;本文通过分析各种隔离驱动电路寄生隔离电容的大小,采用数字隔离器有效隔离输入逻辑信号和驱动信号之间的串扰;2.大的dv/dt造成GaN误开启,造成上下管穿通的问题,本文提出direct-drive的驱动方式,采用负压关断技术,有效控制栅端电压的振铃和误开启现象;3.采用direct-drive的方式带来的问题是负压关断会增大开启GaN器件所需充电的栅极电荷Q,本文采用分段斜率控制的物理机理,在不影响开关速度和效率的前提下解决带来的问题以及优化EMI特性;4.负压关断会使芯片内部各个信号之间的切换变得异常复杂,本文提出高速低功耗的负压电平位移电路,实现电平信号之间的电源轨切换。本文基于60V的0.35μm BCD工艺,借助Cadence仿真平台对子电路和整体系统进行了仿真与验证,在开关频率为1 MHz情况下,芯片系统可实现的开启传输延时为20 ns,关断延时为30 ns,抗共模干扰能力最高可为140 V/ns。

关键词：耗尽型GaN器件 direct-drive 数字隔离器分段驱动负压level-shifter