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摘要: 为了使电网故障录波装置定值操作更加方便,设计并实现了一种电网故障录波装置定值远程操作平台,远程操作人员经互联网通过登录嵌入式服务器的网站实现电网故障录波装置定值的远程操作。将主控制模块作为整个电网故障录波装置定值远程操作平台的核心,通过Atmegal28L 单片机对采集到的电网故障录波装置信息进行定值处理,向执行模块发送操作指令。利用无线通信模块实现嵌入式服务器和电网故障录波装置现场各模块之间的信息交换。通过信号采集模块获取电网故障录波装置的数据,对图像传感器采集波形图进行预处理,完成数据的传递。利用执行操作完成电网故障录波装置的定值操作。软件设计过程中,对电网故障录波装置定值远程操作平台进行了详细的分析,给出了定值操作的程序代码,仿真实验结果表明,所提系统具有很高的可行性及实用性。 相似文献
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电力系统的发展对变电站故障录波装置提出了更高的要求,计算机软硬件技术的飞速进步为微机型故障录波装置的性能改善提供了必要条件。介绍了新型WGL-6型微机故障录波分析装置技术特点、硬件结构配置、性能以及软件包的组成及其功能,还介绍了故障录波的全过程、这种录波方式的特点和这种录波器与旧型录波器相比较而添加的特有功能。 相似文献
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我国电网故障录波装置的录波信息远方传输和管理自动化已逐步引起有关部门的重视,故障信息处理的高度自动化已成为发展的必然趋势。根据目前微机型故障录波装置联网面临的问题及特点进行分析,文中提出一种设计方案及应用实例。 相似文献
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针对海量录波数据上送主站传输开销大的问题,文章提出了一种基于边缘计算的海量录波数据轻量级传输优化方法.研究了高占比的短路故障机理,利用希尔伯特–黄变换(Hilbert-Huang Transform,HHT)算法建立故障可信度指标体系,提出海量录波数据的过滤传输机制,过滤后上送的故障数据仅占海量录波数据的5%,有效缓解... 相似文献
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含有主动干预消弧装置的配电网在单相接地故障时,由于主动干预消弧装置的作用,配网原有中性点消弧线圈呈现出了不一样的动作特点。通过在某10 kV配网进行单相接地试验,对不同故障条件下消弧线圈的动作特性进行了录波研究分析。试验表明,消弧线圈与主动干预消弧装置可以在同一配电网中共存,对主动干预消弧装置的普及应用具有十分重大的意义。 相似文献
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配电网线路运行维护过程中,由于单相接地故障特征波识别方式的差异,使得线路单相接地故障诊断的准确率较低,无法满足电力系统工作需求。提出基于行波信号注入的配网线路单相接地故障状态诊断方法。通过故障录波装置获取故障特征数据,构建故障波形特征库;采用高压脉冲信号源作为行波信号注入源,并分析脉冲源控制回路;根据行波信号反射结果,应用小波变换算法识别线路故障特征波;根据特征提取结果,计算特征空间的欧式距离,完成配网线路单相接地故障状态诊断。实验结果表明:与当前诊断方法相比,所提方法既有效提高了单相接地故障诊断的准确率,又提升了电网线路故障诊断的整体水平。 相似文献
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针对电力系统故障录波装置设计了一套分析和远传自动开停机电路.它可以根据不可工作状态自动开启分析和远传系统(分析站或后台机),待分析和远传后自动关闭分析结,达到无人值守的目的. 相似文献
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《International Journal of Hydrogen Energy》2021,46(78):38795-38808
An effective online fault diagnosis system is of great significance to improve the reliability of fuel cell vehicles. In this paper, a fault diagnosis model for proton exchange membrane fuel cells is proposed. Firstly, the tests of electrochemical impedance spectroscopy under different fault types (flooding, drying, air starvation) and fault degrees (minor, moderate, severe) are carried out, and each polarization loss of the fuel cell is denoted by an equivalent circuit model (ECM). Then, the parameters of the ECM are identified by the proposed random mutation differential evolution algorithm. Furthermore, the parameters identified under different fault conditions are used to train and test a probabilistic neural network-based fault diagnosis model. The fault diagnosis model achieves diagnosis accuracies of 100% for the fault type and 96.67% for the fault degree. By setting operating conditions with different fault degrees, the fault diagnosis model proposed in this paper can realize the fault type and fault degree diagnosis, effectively avoiding the misjudgment of fault types, and is effective for improving the reliability of the fuel cell system. 相似文献
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在分析了汽轮机组回热系统现有故障诊断方法无法解决冗余征兆的不足之后,提出了一种基于粗糙集理论的故障诊断模型。该模型从回热系统典型故障模式出发,通过连续征兆属性的离散化建立了故障诊断决策表;利用遗传算法实现了故障征兆属性约简,并提出了结合领域知识的最小约简择优策略,然后通过给出的决策规则约简的基本原则,得到用于故障诊断的决策规则库。在应用该模型进行故障诊断时,用待诊实例的离散化了的故障征兆属性与规则库中的诊断决策规则进行匹配,对返回的诊断决策规则进行综合评价,并得出诊断结论。利用电站仿真机模拟典型故障进行了故障诊断模型的验证,实践表明,该模型可以有效地约简冗余的故障征兆,并具有较好的诊断效果和一定的容错能力。 相似文献
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A practical fault detection approach for PV systems intended for online implementation is developed. The fault detection model here is built using artificial neural network. initially the photovoltaic system is simulated using MATLAB software and output power is collected for various combinations of irradiance and temperature. Data is first collected for normal operating condition and then four types of faults are simulated and data are collected for faulty conditions. Four faults are considered here and they are: Line to Line faults with a small voltage difference, Line to line faults with a large voltage difference, degradation fault and open-circuit fault. This data is then used to train the neural network and to develop the fault detection model. The fault detection model takes irradiance, temperature and power as the input and accurately gives the type of fault in the PV system as the output. This system is a generalized one as any PV module datasheet can be used to simulate the Photovoltaic system and also this fault detection system can be implemented online with the use of data acquisition system. 相似文献
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人工智能技术的飞速发展为现代能源装备的精益化故障诊断与健康管理提供了可能。风电齿轮箱由多个齿轮、轴承组成,且长期在变速、变载荷工况下运行,依靠传统的故障特征提取结合机器学习方法进行故障诊断存在精度低、缺乏智能性等缺点。文章提出了基于一维密集连接卷积网络的风电齿轮箱故障分类方法:将原始振动信号直接送入网络模型,经过密集连接、合成连接与卷积运算,匹配对应的故障类型,迭代训练故障分类模型;振动信号输入模型后的分类结果决定所属故障类别。文章所提出的风电齿轮箱故障分类方法具有诊断流程简单、故障识别率高等特点,多工况试验台故障数据验证了该方法的有效性。 相似文献
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Jae Yoon David He Brandon Van Hecke Thomas J. Nostrand Junda Zhu Eric Bechhoefer 《风能》2016,19(9):1733-1747
Planetary gearboxes (PGBs) are widely used in the drivetrain of wind turbines. Any PGB failure could lead to a significant breakdown or major loss of a wind turbine. Therefore, PGB fault diagnosis is very important for reducing the downtime and maintenance cost and improving the safety, reliability, and lifespan of wind turbines. The wind energy industry currently utilizes vibratory analysis as a standard method for PGB condition monitoring and fault diagnosis. Among them, the vibration separation is considered as one of the well‐established vibratory analysis techniques. However, the drawbacks of the vibration separation technique as reported in the literature include the following: potential sun gear fault diagnosis limitation, multiple sensors and large data requirement, and vulnerability to external noise. This paper presents a new method using a single vibration sensor for PGB fault diagnosis using spectral averaging. It combines the techniques of enveloping, Welch's spectral averaging, and data mining‐based fault classifiers. Using the presented approach, vibration fault features for wind turbine PGB are extracted as condition indicators for fault diagnosis and condition indicators are used as inputs to fault classifiers for PGB fault diagnosis. The method is validated on a set of seeded localized faults on all gears: sun gear, planetary gear, and ring gear. The results have shown a promising PGB fault diagnosis performance with the presented method. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献