基于多尺度灰色关联的火电机组FCB运行参数分析
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摘要
为了获得火电机组快速甩负荷带厂用电过程主要运行参数之间的关联特性,选取某火电机组Fast Cut Back(FCB)实验过程主要参数,利用小波算法对参数信号进行不同频率的分解,结合灰色关联分析方法对相同频率下的不同信号进行关联分析.结果表明,火电机组FCB过程中,高压旁路阀门开度变化对主蒸汽压力的影响最大;主蒸汽流量的瞬时快速变化对汽包水位的影响比较大;不同运行参数对主蒸汽流量的影响,随着频率尺度的增大,关联度先减小后增大.
In order to grasp the relationship between the main operating parameters during fast cut back( FCB),to optimize the control system.The main parameters during FCB are selected,decomposes the signals at different scales used the theory of wavelet,moreover,analyzes different signals under the same frequency used gray correlation method.The results show,in the process of FCB,changes of high pressure valve opening influence the main steam pressure greatly,rapid of instantaneous change of boiler main steam flow rate has a great impact to the steam drum water level,for the influence on main steam flow rate,with the increase of frequency measurement,correlation degree increases after the decrease,the degree of the influence factors of high frequency is almost the same.
In order to grasp the relationship between the main operating parameters during fast cut back( FCB),to optimize the control system.The main parameters during FCB are selected,decomposes the signals at different scales used the theory of wavelet,moreover,analyzes different signals under the same frequency used gray correlation method.The results show,in the process of FCB,changes of high pressure valve opening influence the main steam pressure greatly,rapid of instantaneous change of boiler main steam flow rate has a great impact to the steam drum water level,for the influence on main steam flow rate,with the increase of frequency measurement,correlation degree increases after the decrease,the degree of the influence factors of high frequency is almost the same.
引文
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[2]冯伟忠.大机组实现快速甩负荷的现实性和技术分析[J].动力工程,2008,28(4):32-547.
[3]冯伟忠.900MW超临界机组FCB试验[J].中国电力,2005,38(2):74-77.
[4]丛日学,于晓辉,孟祥玉,等.火电机组快速甩负荷过程除氧器动态特性研究[J].东北电力大学学报,2018,38(2):46-51.
[5]常志达,周云龙.电站锅炉水冷壁压降特性研究[J].东北电力大学学报,2016,36(4):43-48.
[6]田亮,刘鑫屏,王琪,等.基于多尺度相关和机理建模的炉膛压力分析[J].动力工程学报,2012,32(11):583-588.
[7]余南华,刘永文,张会生,等.余热锅炉汽包水位波动的不确定性成分研究[J].中国电机工程学报,2005,25(7):18-23.
[8]王瑞琪,刘吉臻,高萌,等.火电机组AGC指令特性分析[J].华北电力大学学报,2013,40(5):84-89.
[9]王强,曹小玲,苏明.余热锅炉汽包水位波动信号的EMD特性分析[J].中国电机工程学报,2007,27(2):15-19.
[10]张坤,刘斌.越南海防电厂300MW机组甩负荷试验分析[J].湖北电力,2011,35(2):26-27.
[11]郝祖龙,刘吉臻,常太华,等.基于小波变换的热工信号多尺度相关性分析[J].中国电机工程学报,2010,30(14):109-114.
[12] I.Daubechies.Orthonormal bases of compactly supported wavelets[J].Communications on Pure and Applied Mathemathcs,1988,41(7):909-996.
[13]刘思峰,蔡华,杨英杰,等.灰色关联分析模型研究进展[J].系统工程理论与实践,2013,33(8):2041-2046.
[14]罗毅,周创立,刘向杰.多层次灰色关联分析法在火电机组运行评价中的应用[J].中国电机工程学报,2012,32(17):97-104.
[15]郭建民,高燕,刘石.数字图像炉膛火焰检测试验及污染物排放灰色关联研究[J].锅炉技术,2009,40(3):15-18.