基于SCADA系统和神经网络的海上风电场故障预警方法研究

针对海上风电场的快速发展,风电场故障预警得到了广泛的关注,精准、及时的对海上风电场的风电机组运行进行监测,实现故障精确预警是目前研究的热点问题.本研究将SCADA系统和GA-BP神经网络相结合建立了发电机绕组温度预测模型,并耦合灰色关联度分析法来筛选神经网络模型的输入层数据,确定模型的敏感性指标,基于统计学原理结合风电场评价指标和滑动窗口,计算海上风电场运行预警阈值,根据预警阈值与机组的评价指标确定风电场机组的运行状态,提出一种海上风电场故障预警方法,研究结果表明该模型能有效实现海上风电场故障预警,为海上风电场故障预警方法提供理论依据和技术支撑.     

浅析模块化信息管理在风电场中的应用

通过列举传统管理模式的弊端,结合实际介绍了模块化管理的概念、平台的搭建,以及应用成果,阐述了模块化管理的必然性、优越性以及可推广性。     

风电场动态等值及其在暂态稳定分析中的应用

风力发电厂系统的完整模型建模,阶数太高,不适合全系统在线安全分析和稳定裕度计算。提出一种风电场双馈感应发电机(DFIG)动态等值技术,即将风力发电厂中的多台DFIG发电单元等值聚合为一个发电单元,对发电单元的聚合包括风力涡轮机的聚合、双馈感应发电机聚合以及电能传输和收集系统的聚合。保留了在不同的风速下,被聚合的发电单元的主要的动态性能。聚合模型应用在电力系统在线仿真中,优化了在线分析计算时间,提高了在线计算的精确性。等值前后发电单元具有相同的模型结构。通过仿真研究,验证了动态等值方法的正确性。     

基于GPRS的SCADA系统在高校泵站中的应用

介绍了高校泵站等大型动力设备采用GPRS网络技术,由GPRS网络+DTU+RTU+系统服务器构建SCADA系统,实施远程无线运行数据监控的管理信息化设计思路。结合高校泵站等大型动力设备使用的特点,给出了具体实施方案和运行效果。     

大规模风电场对电力系统稳定性影响的研究

风电机组由于其自身特点,风电机组与传统发电机组有不同的稳态和暂态特性,大规模风力发电接入电网后,电网的电压稳定性、暂态稳定性及频率稳定性都会发生变化。主要针对基于普通异步感应电机和基于双馈式感应电机风电机组的风电场对电网稳定性影响进行深入研究,使得对风电场接入电网后,给电网稳定性带来的问题有更全面、更深入的认识,有利于我国风力发电快速、健康发展。     

WMS软件在风电场微观选址中的应用

以张北坝头风电场一期工程为基础,采用WMS软件(风电场工程特性分析与微观选址软件)对风电机组进行微观选址计算,使风场有较优的布机方案和更好的经济效益,表明用WMS软件对坝头风电场进行微观选址是可行和有效的。     

现场总线在风电场微机监控系统中的应用

把现场总线 (FieldBus)技术应用在大型风电场微机监控系统中 ,提高风电场运行的可靠性 ,降低监控系统的造价。     

风切变指数在风电场风资源评估中的应用

以内蒙古地区3座70m高测风塔连续2年的实测数据来分析风切变指数的变化,结果表明:1)不同高度梯度的风切变指数受地面粗糙度及周围地形地貌的影响较大。2)计算相邻高度的风速时,采用相邻高度间的风切变指数计算得到的结果较好;计算相差较大的高度间风速时,采用拟合曲线得到的风切变指数计算得到的结果较好。3)利用3～25m/s的风切变指数计算各月风速及年均风速结果都与实测值最接近;而利用全部风速数据的风切变指数计算统计各月风速往往比实测值偏大;利用3～25m/s拟合曲线得到的风切变指数统计各月风速比实测值偏小。     

SCADA系统在苏丹油田上的应用

剖析了应用在苏丹油田上的SCADA系统的原理和构成,描述了网络技术在SCADA系统中的应用,并着重对SCADA系统的RTU子系统——1/2/4区块中心处理站CPF进行了硬件和软件的结构和系统分析。     

高分辨率中尺度数值模式在风电场风速预报中的应用

将美国科罗拉多大学的RAMS(Regional Atmospheric Modeling System)模式应用到某风电场短期风速预报的试验中,水平分辨率达到1km.预报结果与10min平均的实测资料对比表明,RAMS模式对6～72h的短期风速预报结果较好.     

风电场微观选址及发电量预测的探讨

对风资源评估、选址地面情况和风机位置的排布等影响风电场微观选址的因素进行了分析.阐述了风电场发电量的预测方法,通过实例说明如何使用相关软件来预测风电场发电量,并根据预测结果对风电场微观选址注意事项进行了探讨.     

Modeling turbine wakes and power losses within a wind farm using LES: An application to the Horns Rev offshore wind farm

A modeling framework is proposed and validated to simulate turbine wakes and associated power losses in wind farms. It combines the large-eddy simulation (LES) technique with blade element theory and a turbine-model-specific relationship between shaft torque and rotational speed. In the LES, the turbulent subgrid-scale stresses are parameterized with a tuning-free Lagrangian scale-dependent dynamic model. The turbine-induced forces and turbine-generated power are modeled using a recently developed actuator-disk model with rotation (ADM-R), which adopts blade element theory to calculate the lift and drag forces (that produce thrust, rotor shaft torque and power) based on the local simulated flow and the blade characteristics. In order to predict simultaneously the turbine angular velocity and the turbine-induced forces (and thus the power output), a new iterative dynamic procedure is developed to couple the ADM-R turbine model with a relationship between shaft torque and rotational speed. This relationship, which is unique for a given turbine model and independent of the inflow condition, is derived from simulations of a stand-alone wind turbine in conditions for which the thrust coefficient can be validated. Comparison with observed power data from the Horns Rev wind farm shows that better power predictions are obtained with the dynamic ADM-R than with the standard ADM, which assumes a uniform thrust distribution and ignores the torque effect on the turbine wakes and rotor power. The results are also compared with the power predictions obtained using two commercial wind-farm design tools (WindSim and WAsP). These models are found to underestimate the power output compared with the results from the proposed LES framework.     

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.     

世界风电产业发展综述

风力发电是目前最具商业化和市场竞争力的可再生能源技术。随着风电技术日趋成熟,风电产业在全球范围得到大力发展,并保持持续增长的势头。全世界风力资源丰富,风力发电将成为最重要的替代能源之一,但风电产业的发展受政策影响较大。文章阐述了世界风力发电产业的现状,分析了世界风电产业的发展趋势。     

风力发电机组噪声测试分析研究

在内蒙古某风电场,利用特定的振动与噪声测试和分析系统,对1000W风力发电机组的整机噪声进行了测试与研究。经分析,该风力发电机的最大噪声小于70dB（A）,符合国家标准的要求。该项工作可为今后噪声控制及降噪措施的研究提供一定的实验依据。     

几种常见风力发电系统的技术比较

结合国内外风力发电的发展现状介绍了几种常见的风力发电系统，详细阐述了风力发电原理和风力机系统的数学模型，并对这几种风力机系统进行技术比较，最后简要介绍了风力发电接入系统后对电网的影响。     

基于静态安全约束的风电场穿透功率极限计算

风电场穿透功率极限的计算是风电场规划阶段的重要内容.以电压稳定为约束条件,分别从静态稳态分析和动态分析两方面进行考虑,确定了既能满足静态稳态运行要求,又动态不失稳的风电场穿透功率极限.静态安全约束指标是线路潮流不过载、节点电压不越限(波动范围5%).暂态稳定的判据是系统中发电机最大功角差第一摆和第二摆衰减震荡,中枢节点电压恢复稳定,各节点电压偏差在额定值的5%之内.     

Current situation and development of wind power in China

The current development of wind power in China was presented in this paper. Many regions such as Xinjiang Uygur Autonomous Region, Inner Mongolia Autonomous Region and southeast coastal region, etc. in China have abundant wind energy resource. At the same time, the utilization of wind power in China has been developing quickly and its prospect is promising in spite of many some obstacles. With the implementation of the Renewable Energy Law, some previous obstacles have been or are being eliminated. Much investment and many enterprises start to enter this field. In spite of this, there still exist some financial and technological obstacles. One of the technological obstacles is the stability of local power grid owing to the increasing proportion of the wind power capacity. Because the centralized development mode of wind power was adopted, the quick fluctuation of wind speed will influence the voltage and frequency stability of local power grid. In addition, large wind farm has little dispatching ability because of the uncontrollability, randomness and fluctuation of natural incoming wind. To erase these obstacles, a novel hybrid power system combining wind farm and small gas turbine power plants is discussed.     

并网风电场联络线线损分析

风电场在配电网末端并网、风电输送线路较长时,线路损耗非常严重。结合某风电场的运行方式分析了风电场联络线线损过高的原因,提出了降低线损的方案。以并入哈密电网的马莲泉风电场为算例,构建仿真模型,基于实际运行数据对比研究了降低线损方案,并从经济性、风电接纳能力两方面分析了方案的可行性。研究结果有助于制定合理的风电接入方案,提高含风电系统的经济效益。     

用于风电场并网中无功电压调节的UPFC仿真分析

以笼式异步电机为基础的风力发电机组并网运行时需要吸收大量无功功率,如果不能提供充分的无功补偿,会导致风电场电压跌落,部分风机脱离,系统无法正常运行。而统一潮流控制器（UPFC）具有控制线路潮流,提高电网稳定的作用,可以应用于风电并网之中。针对上述问题,在某一风场内的变风速条件下,用软件MATLAB/simu link建立基于恒速恒频异步发电机的风电机组并网模型并仿真,通过分析仿真结果,对比应用UPFC进行无功补偿前后风电场及电网的运行状态变化,证明UPFC可以调节带有风电场的系统无功功率和电压,维持电网稳定运行。