风电塔筒是风电机组重要支撑结构,其垂直度对机组安全及稳定性有重要影响,塔筒受自然和人为因素的长期影响会出现表面损伤、结构不均匀等现象,塔筒的传统监测方法会产生异常误差而导致测量结果失真.对此,本文采用稳健估计理论分析风电塔筒垂直度,结合最小二乘法拟合塔筒截面测量值的圆心及半径,通过Huber迭代权函数,逐步消除测量值序列存在的粗差、偶然误差等异常测点的影响,并采用实例进行验证.结果 表明:稳健最小二乘法拟合风电塔筒垂直度具有较强的抗差能力,可有效避免粗差、偶然误差等异常测量值的影响,提高了拟合参数和垂直度分析的可靠性,易于编程实现,具有较强的实用价值,该方法可为风力发电塔及类似高耸塔筒的垂直度监测分析提供参考.

光伏信息设备是光伏监控系统中的一个重要组成部分,为对其状态进行有效预测以更好地确保系统正常运转,提出了一种小生境灰狼优化(NGWO)的信息设备状态预测方法.该方法首先构建基于长短期记忆神经网络(LSTM)的光伏信息设备的状态预测模型,接着利用NGWO算法确定出LSTM的网络参数,NGWO算法具有较快的收敛速度和全局寻优的能力,保证了模型对信息设备状态的准确预测.实验结果表明,该方法能够很好地表征光伏信息设备状态的变化规律,且具有较好的泛化能力和预测精度.

对某台运行中的风电机组存在异响的齿轮箱的振动数据进行采集后,采用Hilbert解调法分析出了齿轮箱内部高速轴存在断齿现象,并通过现场检查齿轮箱内部部件发现了断齿.Hilbert解调法能有效提取风电机组齿轮箱振动信号的故障信息,可有效应用于风电机组齿轮箱的振动数据分析及故障诊断工作中.

在气体间隙引入固体绝缘介质的组合绝缘结构中,电极-气体-固体介质“三结合点”周边发生的电场畸变,在较低电压下就会发生电极边缘气隙中的局部气体电离,引起沿固体介质表面的沿面闪络,降低气隙放电电压.采用外屏蔽槽结构的电极,能够降低“三结合点”电场强度,减少沿面闪络发生概率,有效提升间隙放电电压.

1 厂用电率定义 以某台200 MW机组为例,其设计额定工况下的厂用电率估算方法为[1] e=S(c)cos(e)av/Pe×100％ (1) Sc=∑(KP) (2) 式中:e为厂用电率,％;Sc为厂用电计算负荷,kVA;cos(e)av为电动机在运行功率时的平均功率因数,一般取0.8;Pe为发电机额定功率,kW;K为换算系数,取中的数值;P为电动机的计算功率,kW.

This article through several typical case of stator and rotor,in recent years the operation of 600 MW grade domestic thermal power generator fault is analyzed,and then the supervision and Suggestions.Generator insulation。

The collector-rings' fire accident resulted from bad contact between carbon brushes and collector-rings on the generator and burnt process on main shaft of the generator have been analysed.It is believed that the local sparks resulting from bad contact between carbon brushes and collector-rings make the temperature of collector-rings to be risen,the non-uniform distribution of excitation current among carbon brushes leads further to fire accident on collector-rings,thereby,preventive measures for occurrence of fire accident on collector-rings have been presented.

Severe defects existing on stator winding bars had been discovered in operation of generator no.2 in one power,after retrofits,such as replacement of stator winding bars,and improvement of their fixed mode etc.,the defects still hadn't effectively eliminated.Based on summation and analysis of defects existing in the generator and causes of ineffective retrofit,three measures for defect-eliminating and capacity-increasing retrofit have been put forward,and the feasibility of said three methods being compared in detail,to determine the retrofit scheme.

介绍了修订后国标<局部放电测量>,与原标准相比改动很大,其中名词术语增加了测量系统特性等三个条款,详细规范了测量回路特性,增加了测量系统标准的内容;最后附录部分也由3个增加到7个.