直驱式永磁同步风力发电机组低电压穿越研究

本文对直驱式永磁同步风力发电机组的低电压穿越方案进行了研究,综述了国内外主要的LVRT方案,列举了改进的控制策略,并对常用的Crowbar保护方案进行了分类总结,讨论了各自的优缺点。分析表明,电网故障时可以采用多种方法结合的方式平稳实现LVRT。     

永磁直驱风力发电机组主机架强度分析

运用风力机空气动力学、结构动力学、强度分析等理论和现代设计方法,以GL、IEC、Eu-roCode3等风力发电机组规范为依据,利用非线性有限元分析软件MSC.MARC对主机架结构进行静强度、模态、以及疲劳寿命分析,并对结果进行校核评价。总结了运用MSC.MARC进行风力发电机组关键零部件设计与分析的方法,为风力发电机组零部件的自主设计和结构优化提供可靠的科学依据,具有理论意义和工程使用价值。     

大型直驱型风力发电机组钢制圆锥形塔筒设计

塔筒是直驱型风力发电机组的重要部件。本文以直驱型风力发电机组塔筒为研究对象,阐述塔筒的作用,分析总结塔筒设计的主要思路。     

直驱风力发电机的功率控制

以直驱式永磁同步风力发电机组为对象,为使风机运行在最佳输出功率下,研究了额定风速下基于转速控制的最大功率点跟踪（MPPT）策略,以及额定风速上基于桨距角控制的功率控制策略。并基于Matlab／Simulink对功率控制策略进行了仿真,初步验证了控制方法的可行性。     

直驱风力发电机强制通风过滤散热系统设计应用

针对直驱风力发电机的散热需求设计了强制通风过滤散热系统,通过对某型直驱发电机设计的强制通风散热系统的滤芯选型、数量确定,风道结构设计和压损计算,以及风机配置选定等的分析,得出了合理的设计方案,经验证按此设计方案设计的散热系统满足发电机散热需求,且对发电机更安全,同时具有功耗低、结构简单,且成本低等优势,为直驱发电机强制过滤散热系统设计提供了理论依据。     

永磁直驱风力发电机结构发展研究

直驱式永磁风力发电机具有高功率密度、高效率、高可靠性、低维护成本和电网兼容性好、低电压穿越能力强等优点而成为最具发展前景的风力发电解决方案。介绍了径向磁通、轴向磁通以及横向磁通电机的结构电机的特点以及应用情况,针对目前市场的主流径向磁通永磁风力发电机,综合考虑电机的轴承支撑方式、冷却方式以及内外转子结构,将其分成四种结构,并对每种结构形式的特点加以详细的分析和介绍,并指出各种结构电机的优缺点,对永磁风力发电机结构的发展趋势进行了阐述。     

3.3MW永磁直驱风力发电机温度场仿真分析

兆瓦级永磁直驱风力发电机随着功率等级的提升,运行温度升高会对电机绝缘造成威胁,还会导致永磁体的不可逆退磁。针对这一问题,本文基于一台3.3MW,12r/min的外转子表贴式永磁电机,设计并建立了其径向强迫通风冷却结构,采用迭代仿真的方法合理地考虑电磁场与温度场的耦合关系,并基于流固耦合的方法对其温度场与流体流动情况进行分析。结果表明,本文所设计的通风结构具有一定的冷却效果,能够满足其安全稳定运行的需求,对兆瓦级永磁直驱风力发电机的冷却系统设计具有一定的借鉴意义。     

永磁直驱风力发电机的定子支撑轻量化设计

针对目前大型永磁直驱风力发电机定子安装机座设计笨重的缺陷,提出一种新型的抗定子变形的结构方案,该方案通过结合发电机组固定部分自身的结构及装配特点,并在特定部位来设置抗变形部件,在解决现有风力发电机定子机座体积庞大、结构笨重等问题的同时,显著提高定子机座的抗拉强度,并有效防止机座在各类发电场合下产生变形。     

风力发电机组故障诊断专家系统研究

随着风力发电行业的不断发展,风力发电机的装机数量不断增加。由于其结构复杂和工作环境恶劣,极易发生各种故障。文章通过对风力发电机组故障诊断专家知识进行总结,使用ASP.NET平台开发和SQL Server 2008数据库,利用产生式规则和主观贝叶斯方法相结合实现推理,构建了风力发电机组故障诊断专家系统,通过人机交互实现对风力发电机组故障的在线诊断,并通过其知识库的不断维护更新来提高系统故障诊断的能力。     

直驱永磁风力发电机电磁仿真分析与优化设计

首先利用Ansoft软件建立直驱永磁风力发电机的Maxwell二维(2D)有限元模型,之后对直驱永磁风力发电机进行斜槽2D仿真分析。在此基础上,以直驱永磁风力发电机的齿槽转矩的减少及气隙磁密的均值为目标,选择Maxwell优化模块中内置的遗传算法作为参数优化的方法,对直驱永磁风力发电机的磁钢宽度、磁钢厚度、磁钢与转子中心距离、转子外径等结构参数进行优化设计。通过对参数优化前后的齿槽转矩及气隙磁密曲线的对比,验证了优化设计方法的有效性。     

兆瓦级变速恒频风力发电机组控制系统的研究

与失速型风力发电机组相比,变速恒频风力发电机组运行在额定风速以上时,输出功率平稳,且传动系统具有良好的柔性.针对兆瓦级变速恒频风电机组的上述特点,本文从硬件组成、系统控制和安全保护等三方面介绍了兆瓦级变速恒频风电机组的控制系统,并对大型风电机组整机控制和安全保护功能进行了深入的研究与试验.     

垂直轴风力发电机结构研究进展

与水平轴风力发电机相比,垂直轴风力发电机具有结构对称、风能利用率高、噪音低等优点,有着较为广阔的市场前景。首先对垂直轴与水平轴风力机作了比较,分析了垂直轴风力发电机的特点,简要地概述了垂直轴风力机的先后发展,分别介绍了常见的萨渥纽斯阻力型、达里厄型及其变形结构等垂直轴风力机的结构,阐述了国内外学者对垂直轴风力机结构的研究现状,最后简要地分析了设计垂直轴风力机所面临的主要问题。     

柔性桨风力机理论研究

推导出了柔性桨风力发电机输出功率表达式,讨论了此种风力机6个参数对输出功率的影响。     

Mechanism analysis and suppression strategy research on permanent magnet synchronous generator wind turbine torsional vibration

Torsional vibration of flexible drive chain is a historical issue. With the maximization development and the rotating machinery high-speed operation, the drive chain systems of large-scaled units become more and more complex, which makes the torsional vibration problems becoming increasingly prominent in recent years. This article deeply analyzed the small signal stability of large-scaled WECS based on CMT, elaborated the torsional vibration mechanism and reasons for the first time and pointed out torsional vibration is caused by the disturbance wind and the DPC strategy. The disturbance wind is an external stimulus and can produce a low-frequency torsional vibration at the same frequency as wind speed. The DPC could weaken the drive chain damping. If the total damping of drive chain is negative, the unstable torsion vibration will occur. And if the drive chain is still a under-damped dynamic, the high-frequency torsional vibration at natural frequency will be generated. Therefore, large-scaled WECS must have damping control. This study found that appropriate enhancing drive chain stiffness could reduce low-frequency torsional vibration caused by wind speed. Therefore, a damping and stiffness compensation control method was proposed to suppress the torsional vibration. Compared with the conventional damping control, the new method not only can suppress the high-frequency torsional vibration but also has a good restraining effect on the low-frequency torsional vibration. Furthermore, the detailed design procedures including the calculation of injection damping and stiffness were given in this paper. Finally, the correctness and effectiveness of our analysis were further verified by the simulation experiments     

电动叉车的直接驱动策略研究

针对电动叉车的行走驱动提出1套全新的直接驱动策略,使电动叉车的结构最简单化,驱动效率和灵敏度大大提高。根据电动叉车装卸货物时要求具有良好低速性能的特点,研究并提出直接驱动方案对驱动电机的要求;针对采取直接驱动方式后所产生的新技术问题,阐述了几种控制策略,并进行了分析对比,使电动叉车的行走更具有平滑性和鲁棒性。     

Hybrid DSO-GA-based sensorless optimal control strategy for wind turbine generators

The operation of a wind turbine generator involves natural uncertainty due to aerodynamic characteristics, resulting in a system that performs inefficiently. In general, the conventional controller now in wide use is not suitable for every operating point, because its tuning parameters and set-points do not meet the varying system characteristics. A study into an optimal control technique is conducted to reduce the negative effects of inherent uncertainty in system operation. In order to resolve the uncertainty problem, an optimal control method for an effective wind turbine generator is designed on the basis of a sensorless frame by utilizing a hybrid of the direct search optimization method (DSO) and the genetic algorithm (GA). This method is easy to implement and computation of functional derivatives is not necessary. The conventional GA is well known for its high performance in global optimization and its effectiveness in making ideal choices for control variables. The proposed DSO-GA hybrid differs from the conventional GA in terms of the sampling survey and the crossover operation. Moreover, the proposed multivariable optimal control strategy is a sensorless optimization technique that determines the pitch angle of the blades and the yaw angle of the nacelles to produce stable maximum power from a wind turbine system under steady-state operation. The proposed DSO-GA controller is implemented for a lab-scale wind turbine generator exposed to artificial wind, and the experimental results constitute a 3-D performance surface model of output voltage, which is used as an objective function for simulation. The optimization procedure with the objective function is carried out by means of the conventional and proposed methods, whose results reveal that the proposed DSO-GA optimizer yields far better performance in terms of generation number, convergence rate, and robustness. Both techniques are applied to a wind power generator through simulation and experiments. The performances are compared, and conclusions are drawn for each case.     

垂直轴风力发电机叶片气动性能研究

性能优越的垂直轴风力发电机正越来越受到关注。优良的风叶是使垂直风力发电机获得最大风能利用系数和良好经济效益的基础。垂直风力发电机叶型的气动性能研究是当前叶片设计的重要内容。利用ANSYS FLUENT12.0对NACA4412、FX76MP12、DU86-137-25以及C型四种不同叶片的气动性能进行了仿真和分析,得出C型叶片相对其他三种叶片有着更好的气动性能,能为垂直风力发电机叶片的设计起到指导作用。     

基于风况的风力发电机组选型设计

为解决目前风力发电行业机组设计和选型存在的较多问题.本研究以风况各参数作为关键依据,结合风资源测量技术,将风况分析应用到机组选型设计中.通过对风况各参数的分析,确定风况与风力发电机组性能和载荷的关系,提出了基了:风场实际风况的风力发电机组选型设计方法.利用先进的风力发电机组专用设计软件进行了机组在各工况下的载荷分析,结...     

一种风力发电机组轴瓦式齿轮箱减振器的研制

介绍了三点支撑式风力发电机组用轴瓦式齿轮箱减振器的载荷计算、结构设计及刚度计算方法。根据产品的载荷工况及技术输入,确定了产品的整体方案,使用ABAQUS 6.10软件对产品进行了有限元分析,确定了产品的具体结构,计算结果表明产品的刚度和强度均满足技术要求。通过产品试验进一步验证了产品在给定载荷下是安全可靠的。