内蒙古又引进大型风电机组

内蒙古又引进大型风电机组１９９５年底，德国胡苏姆公司与中国第一拖拉机制造公司合作生产的４台２５０ｋｗ风力发电机组在内蒙古投产。这是继内蒙古朱日和风电站引进胡苏姆公司的风电机后，该公司与中方的又一次成功合作．这４台２５｛）ｋｗ风力发电机组的部件国产率２...     

世界并网型风电机技术发展趋势

扼要介绍了当前世界上流行的几种风电机调节技术,论述了世界风电机技术发展趋势,指出了我国风电机技术发展现状和差距。认为我国“十五”期间应开展风电机调节技术的攻关。     

基于风电机故障的电力系统运营风险评估及保险转移的研究

风电机故障导致的系统电力缺额会给系统运营带来经济损失,目前由系统运营部门承担。为实现风险转移,建立了风电场风电机故障概率出力模型,并考虑了风电场风电机故障下电力系统运营的风险,通过对风电机故障条件下电力系统的蒙特卡罗抽样仿真,计算了不同负荷条件下电力系统运营调度的经济风险,并制定相应的保险转移机制。为全面评估风电的经济价值和风电场的规划设计提供了参考,并为风电场风电机故障风险转移提供了一种可供选择的方法。     

改进的双馈风电机短路电流计算及保护方案研究

从双馈风电机暂态内电势变化机理的角度出发,计及转子电流动态的影响,精确计算发生三相短路时双馈风电机的定转子磁链,提出改进的双馈风电机短路电流有效值计算方法。基于电子系统实时数字仿真器(RTDS)的含双馈风电机实际控制器的物理实验平台,验证了所提出的短路电流计算方法较忽略转子动态过程的计算方法有更高的精确度。在此基础上,分析双馈风电机短路电流和低电压穿越要求对保护的影响,并提出一种改进的风电场送出线保护方案。     

高山风电场运行的特点分析及对策

总结了几年来高山风电场的运行管理经验，对高山风电场风电机等设备的选型，风电机的位置选择等作了分析，并提出了一些参考要素；根据运行的第一手资料，对恶劣的高山气象条件，诸如湿度大、雾淞冰冻、雷电等对风电机、输业线路的影响程度，作了较为仔细的分析，并提出了一些对策；同时，对运行几年来，风电机出力没达到设计要求作了分析。     

双馈风电机组PWM变换器的控制策略及其参数优化

为提高双馈风电机组PWM变换器的控制效果、提高机组电能质量,基于双馈风电机组PWM变换器数学模型并结合矢量控制理论,提出利用非线性单纯形算法优化双馈风电机组PWM变换器PI控制器参数,并在电磁暂态仿真软件PSCAD/EMTDC中对优化前后系统的动态性能进行了比较。结果表明,利用该优化方法能够改善控制系统的各项动态性能,提高了控制精度,且具有良好的鲁棒性。     

自适应蝙蝠裙叶片研发进展

正本发明是空气动力学与仿生学相结合的产物。自适应蝙蝠裙叶片设计优化了翼型,前沿是刚性的(承受弯力、保持翼型等);后沿是柔性蝙蝠裙,有一定的适应全风速(不同风速)的能力。能有效提高全风速风能利用系数(大型风电机组10%-小型风电机组19%);减小切入风速,扩展风电利用地域;高效利用电能,降低风电成本(大型风电机组9%,小型风电机组16%)。输出功率全风速提高,小风提高幅度大(一)自适应蝙蝠裙叶片功率提高百分比     

水平轴风电机型谱分析

按容量把现有的风电机分为百瓦、千瓦、十千瓦、百千瓦和兆瓦等五个等级，介绍了各等级的典型风电机及其主要应用，给出了风速６个参数，与功率密度有关的６个参数，有关风电机效率的３个参数和４个经济性指标。     

REpower系列1.5MW风电机组安全检查

1引言对于兆瓦级风电机组来说,机组安全至关重要。国内安装的REpower、Nodex和东汽1.5MW风电机组,均采用国际上较为成熟的Mita控制器,主刹车系统使用的是直流     

信息四则

世界上最大的6MW风电机组;国内最大的2MW风电机落户平潭;重庆投资50亿元建立风电产业基地;辉腾锡勒建成全国最大风电场。     

风力机风轮模态局部化的动力学机理与影响因素分析

该文对风力机叶片损伤导致风轮模态局部化的动力学机理与影响因素进行研究。首先从代数特征值角度,揭示模态局部化的动力学机理,发现结构产生模态局部化的主要原因是存在密集模态。其次,建立NREL 5 MW风轮结构的有限元模型,分析叶片失谐度、模态阶数和失谐位置对风力机风轮结构模态局部化的影响。结果表明：叶片损伤失谐会造成叶片的振型发生显著变化,产生模态局部化现象;同时在某些模态下,系统振动能量集中于损伤叶片,会加速叶片损伤,致使其产生疲劳破坏。因此在风力机结构设计时,需考虑模态局部化对风力机结构的动力学特性影响。     

大型风电场电网三相短路故障暂态分析

采用计算机仿真的方法,对大型风电场在电网发生三相短路故障时的暂态特性进行了研究.在首先建立了主动失速型风力发电机数学模型和仿真模型的基础上,研究了当装有失速型风力发电机组的风电场的外部电网发生三相短路故障时,风电场以及机组主要参数的暂态响应,深入分析了风力发电机组和配套的设备在电网故障时的动态特性.研究结果表明,三相短路故障引起的电压振荡为机组和电网的正常运行带来不利影响,常常会引起机组保护动作.     

模糊理论在风力发电机组故障诊断中的应用

模糊理论为基础，结合风力发电机组的实际运行工况、现场运行人员和专家的经验，分析了故障与征兆之间的模糊关系，形成了模糊故障诊断规则，建立了风力发电机组模糊故障诊断自适应修正数学模型。最后对一个具体故障实例加以分析，验证了模糊理论在风力发电机组故障诊断中的可行性。     

Localization of wind turbine noise using a microphone array in wind tunnel measurements

An experimental investigation on scaled wind turbine models in a wind tunnel with a microphone array is presented. Our study focuses on the localization and quantification of aerodynamic noise sources on rotating wind turbine blades with the aim of identifying the contributing factors that have an impact on the source spectra. Therefore, wind tunnel measurements were conducted for three different blade geometries (NACA 4412 shape, Clark-Y shape, and sickle shape), five pitch angles between ?2° and +8° and five wind velocities between 5 and 13 ms^??1. For the localization of rotating sound sources with a microphone array, a rotating beamforming method based on the acoustic ray method is used. The Clean-SC deconvolution method was used to improve the resolution of the acoustic sources, and integrated spectra were calculated for the individual blades. The sound sources were localized at the wind turbine blades and assigned to the leading edge and trailing edge subregions. The results show a high dependency on the sound source distribution and the source strength with regard to the observed one-third octave bands, wind velocity, and blade geometry. Hence, the localization of rotating sound sources with a microphone array is a suitable method for the development of wind turbine blades that emit less noise.     

含多个风电场的穿透功率极限概率值计算及置信区间估计

考虑了不同地域的风速变化和负荷波动,并计及发电机组和输电线路随机故障的不同场景,采用蒙特卡罗方法进行状态抽样;构建含多个风电场的风电机组容量优化模型进行优化分析;为贴近系统未来实际运行情况,引入基于一定置信概率下风电场最大机组容量的区间值估计;IEEE30节点算例分析表明:在不同地点同时接入风电机组的效益将优于在同一地点集中接入的情况,风电场穿透功率极限区间估计更加易于适应系统未来运行状态的不确定性,从而验证了该文提出的模型和方法的可行性和正确性。     

Investigation on the integral output power model of a large-scale wind farm

The integral output power model of a large-scale wind farm is needed when estimating the wind farm’s output over a period of time in the future. The actual wind speed power model and calculation method of a wind farm made up of many wind turbine units are discussed. After analyzing the incoming wind flow characteristics and their energy distributions, and after considering the multi-effects among the wind turbine units and certain assumptions, the incoming wind flow model of multi-units is built. The calculation algorithms and steps of the integral output power model of a large-scale wind farm are provided. Finally, an actual power output of the wind farm is calculated and analyzed by using the practical measurement wind speed data. The characteristics of a large-scale wind farm are also discussed.     

Economics of Wind turbine as an energy fuel saver – A case study for remote application in oman

This paper presents a study carried out to investigate the economics of wind turbine as an energy fuel saver. The load and the wind data is taken from a remote agricultural research station in Oman. Presently, the station is provided with electricity from diesel-engine generating units. The annual peak load and minimum load recorded at the site is 130 kW and 28 kW respectively. The annual average wind speed at the site is 5.7 m/s. A 50-kW wind turbine is selected to demonstrate the economic feasibility of the turbine as a fuel saver. The results show that wind energy utilization is an attractive option with total specific cost of the selected wind turbine ranges between 7.4 and 8.45 ¢/kWh at 7.55% discount rate comparing to diesel generation operating cost of 14.3 ¢/kWh, considering the capital cost of diesel units as sunk. The simple payback period of the turbine is between 5.1 and 5.4 years and discounted payback between 6.7 and 8.0 years.     

Radar‐based structural health monitoring of wind turbine blades: The case of damage localization

This short communication reports on a radar approach for structural health monitoring of wind turbine blades. Therefore, a bistatic frequency‐modulated continuous wave (FMCW) radar in the frequency range from 33.4 to 36.0 GHz has been developed and tested experimentally using a laboratory wind turbine demonstrator. A differential damage localization framework is presented here that exploits signal differences between measurements from the intact and the damaged structure for 3D imaging of the defect. We have achieved the localization of a 30‐mm cut in a glass fiber composite structure as well as the localization of a water pack at the backside of the specimen with a localization error of several centimeters.     

双馈风电机组电能质量特性联合仿真建模分析

建立双馈风电机组（DFIG）联合仿真精细化模型——GH Bladed-Matlab模型。在GH Bladed中搭建机组主要机械部件模型,在Matlab中搭建机组的主要电气部件。选取2.2 MW的双馈风电机组搭建模型,根据现场测试数据修正GH Bladed-Matlab模型,使仿真得到的机组闪变外特性、谐波外特性、功率控制外特性与其现场测试波形外特性基本保持一致,确保研究得到的联合仿真模型高精确性。所建立的模型在针对机组电能质量特性因素定性研究的基础上,结合数据进行定量分析,为同系列机组电能质量特性优化提供参考。     

Active power variation in wind farms by varying the number of wind turbine units

Aggregated representation of wind turbine units in the wind farm has been normally adopted for modelling and analysis of dynamic performance, with power variation obtained by change of wind speed in the literature. This paper presents a different scenario of power variation of wind farms by the addition and removal of turbines in wind farms and its implication in modelling and stability of wind farms. The steady-state and dynamic stability with the aggregated model of the wind farm has been analysed with variation in the number of turbine units and has been corroborated with time domain simulation in DIgSILENT Power Factory software. It has been concluded that the variation in the number of wind turbines generators connected to the same transmission line has a minimal impact on the stability in nonseries-compensated line; however, significant impact on the stability has been observed in series-compensated system.