Article(id=1211002409392927278, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1210998030828958715, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202305076, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1683475200000, receivedDateStr=2023-05-08, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1766655073736, onlineDateStr=2025-12-25, pubDate=1706112000000, pubDateStr=2024-01-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1766655073736, onlineIssueDateStr=2025-12-25, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1766655073736, creator=13701087609, updateTime=1766655073736, updator=13701087609, issue=Issue{id=1210998030828958715, tenantId=1146029695717560320, journalId=1210938733613449225, year='2024', volume='53', issue='1', pageStart='1', pageEnd='196', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1766654029805, creator=13701087609, updateTime=1766734793553, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1211336778607366994, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1210998030828958715, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1211336778611561299, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1210998030828958715, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=188, endPage=196, ext={EN=ArticleExt(id=1211002410093376082, articleId=1211002409392927278, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Prediction of water wall temperature based on improved grey wolf optimizer and bidirectional long and short term memory network, columnId=1211002409397129992, journalTitle=Thermal Power Generation, columnName=Power generation technology forum, runingTitle=null, highlight=null, articleAbstract=

An improved grey wolf optimizer (MGWO) is used to optimize BiLSTM to predict water wall temperature. The improved algorithm adopts nonlinear factor adjustment strategy, adaptive position update strategy and dynamic weight modification strategy to improve the global optimization ability of the GWO. The improved grey wolf optimizer is used to optimize the number of hidden layers, learning rate and regularization parameters of the BiLSTM model to improve the prediction accuracy of the model. The data of a power plant in Xinjiang are used for prediction simulation. The results show that, the improved optimizer has higher prediction accuracy, and can predict the change trend of wall temperature when the unit is lifting and lowering load. Compared with the LSTM and BiLSTM models, the average root mean square error of the model reduces by 9.86% and 3.69%, respectively, and the overtemperature of water wall temperature can be predicted in advance, which is of great significance for the prevention of overtemperature of water wall.

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提出一种基于改进灰狼(MGWO)算法优化双向长短时记忆(BiLSTM)神经网络的水冷壁壁温预测模型,灰狼算法采用非线性因子调整策略、自适应位置更新策略和动态权重修改策略进行改进以提升算法的全局寻优能力,利用改进灰狼算法优化BiLSTM模型的隐藏层数量、学习率和正则化参数以提高模型的预测精度,采用新疆某电厂的数据进行预测仿真,结果表明:改进后的算法预测精度更高,在机组升、降负荷时,均可以预测到壁温的变化趋势,模型的平均均方根误差相比于长短时记忆(LSTM)神经网络、BiLSTM模型分别降低了9.86%和3.69%,且可以提前预测到水冷壁壁温的超温情况,对于预防水冷壁超温有重要意义。

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冯磊华(1980),女,博士,副教授,主要研究方向为热工过程建模与优化控制,
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詹毅(1999),男,硕士研究生,主要研究方向为热工过程控制建模与优化控制,

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詹毅(1999),男,硕士研究生,主要研究方向为热工过程控制建模与优化控制,

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Acta Electronica Sinica, 2019, 47(1): 169-175., articleTitle=An improved grey wolf optimization algorithm, refAbstract=null), Reference(id=1211002428703502612, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, doi=null, pmid=null, pmcid=null, year=2012, volume=36, issue=8, pageStart=228, pageEnd=232, url=null, language=null, rfNumber=[26], rfOrder=41, authorNames=刘文颖, 门德月, 梁纪峰, journalName=电网技术, refType=null, unstructuredReference=刘文颖, 门德月, 梁纪峰, 等. 基于灰色关联度与LSSVM组合的月度负荷预测[J]. 电网技术, 2012, 36(8): 228-232., articleTitle=基于灰色关联度与LSSVM组合的月度负荷预测, refAbstract=null), Reference(id=1211002428783194391, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, doi=null, pmid=null, pmcid=null, year=2012, volume=36, issue=8, pageStart=228, pageEnd=232, url=null, language=null, rfNumber=[26], rfOrder=42, authorNames=LIU Wenying, MEN Deyue, LIANG Jifeng, journalName=Power System Technology, refType=null, unstructuredReference=LIU Wenying, MEN Deyue, LIANG Jifeng, et al. 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Power System Protection and Control, 2022, 50(17): 125-132., articleTitle=CNN-LSTM short-term electricity price prediction based on an attention mechanism, refAbstract=null)], funds=[Fund(id=1211002423062163532, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, awardId=2018JJ3552, language=EN, fundingSource=Natural Science Foundation of Hunan Province(2018JJ3552), fundOrder=null, country=null), Fund(id=1211002423229935699, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, awardId=2018JJ3552, language=CN, fundingSource=湖南省自然科学基金项目(2018JJ3552), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1211002414786802350, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, xref=1., ext=[AuthorCompanyExt(id=1211002414795190961, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, companyId=1211002414786802350, language=EN, 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articleId=1211002409392927278, language=EN, label=Fig.2, caption=Function optimization convergence curves, figureFileSmall=Uz+YxXpR/N+NHX6IdtxlnA==, figureFileBig=myIkaXkXSTQY+T7KumPCKg==, tableContent=null), ArticleFig(id=1211002418691699568, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=CN, label=图2, caption=函数优化收敛曲线, figureFileSmall=Uz+YxXpR/N+NHX6IdtxlnA==, figureFileBig=myIkaXkXSTQY+T7KumPCKg==, tableContent=null), ArticleFig(id=1211002418788168565, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=EN, label=Fig.3, caption=MGWO-BiLSTM predicts the wall temperature process of the water wall, figureFileSmall=NodzjtUk6UQ1nri4RdpP/w==, figureFileBig=AnC8o+n+5X7651ejzv7TOg==, tableContent=null), ArticleFig(id=1211002418888831869, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=CN, label=图3, caption=MGWO-BiLSTM预测水冷壁壁温流程, 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tableContent=null), ArticleFig(id=1211002419337622421, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=CN, label=图5, caption=降负荷壁温预测曲线, figureFileSmall=+vRWpspuiawwRocnx+z/dg==, figureFileBig=y7AsfFFd1hCHkY3aeZuB2Q==, tableContent=null), ArticleFig(id=1211002419438285725, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=EN, label=Fig.6, caption=The predicted wall temperature curves at stable load, figureFileSmall=E0jWoTgZO85ui/nx2B5Tsw==, figureFileBig=VC79yT9a/fg2ToJpVBq0/w==, tableContent=null), ArticleFig(id=1211002419547337638, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=CN, label=图6, caption=稳定负荷壁温预测曲线, figureFileSmall=E0jWoTgZO85ui/nx2B5Tsw==, figureFileBig=VC79yT9a/fg2ToJpVBq0/w==, tableContent=null), ArticleFig(id=1211002419652195247, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=EN, label=Fig.7, caption=The predicted wall temperature curves during load ascending, figureFileSmall=0sM444wTBRnOtRCDNlXzbw==, figureFileBig=vLvQ2teDBGhIYNQSPGPX5Q==, tableContent=null), ArticleFig(id=1211002419744469945, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=CN, label=图7, caption=升负荷壁温预测曲线, figureFileSmall=0sM444wTBRnOtRCDNlXzbw==, figureFileBig=vLvQ2teDBGhIYNQSPGPX5Q==, tableContent=null), ArticleFig(id=1211002419819967422, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=EN, label=Tab.1, caption=

Baseline functions

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函数维数范围最优解
f1(x)=i=1nxi230[–100, 100]0
f2(x)=i=1n|xi|+i=1n|xi|30[–10, 10]0
f3(x)=i=1n[xi210cos(2πxi)+10]30[–5.12, 5.12]0
f4(x)=14 000i=1nxi2i=1ncos(xii)+130[–600, 600]0
f5(x)=(1500+j=1251j+i=12(xiaij)6)12[–65, 65]1
f6(x)=i=111[aix1(bi2+bix2)bi2+bix3+x4]24[–5, 5]0.000 30
), ArticleFig(id=1211002419945796553, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=CN, label=表1, caption=

基准函数

, figureFileSmall=null, figureFileBig=null, tableContent=
函数维数范围最优解
f1(x)=i=1nxi230[–100, 100]0
f2(x)=i=1n|xi|+i=1n|xi|30[–10, 10]0
f3(x)=i=1n[xi210cos(2πxi)+10]30[–5.12, 5.12]0
f4(x)=14 000i=1nxi2i=1ncos(xii)+130[–600, 600]0
f5(x)=(1500+j=1251j+i=12(xiaij)6)12[–65, 65]1
f6(x)=i=111[aix1(bi2+bix2)bi2+bix3+x4]24[–5, 5]0.000 30
), ArticleFig(id=1211002420059042772, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=EN, label=Tab.2, caption=

Data set

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数据类型选取时段数据组数
数据集8月18日—8月24日18 000
训练集8月18日—8月22日14 112
测试集8月23日—8月24日3 888
), ArticleFig(id=1211002420151317464, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=CN, label=表2, caption=

数据集

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数据类型选取时段数据组数
数据集8月18日—8月24日18 000
训练集8月18日—8月22日14 112
测试集8月23日—8月24日3 888
), ArticleFig(id=1211002420260369376, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=EN, label=Tab.3, caption=

The grey correlation degree calculation result

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因素灰色关联度因素灰色关联度
主蒸汽温度0.973机组功率0.825
分离器壁温0.971给水流量0.810
一次风温0.961一次风压0.785
给水温度0.950二次风总量0.777
一次风总量0.941给水压力0.760
主蒸汽压力0.869出口烟气含氧量0.753
分离器出口蒸汽压力0.865中间点过热度0.716
总燃料量0.835二次风压0.694
), ArticleFig(id=1211002421556409324, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=CN, label=表3, caption=

灰色关联度计算结果

, figureFileSmall=null, figureFileBig=null, tableContent=
因素灰色关联度因素灰色关联度
主蒸汽温度0.973机组功率0.825
分离器壁温0.971给水流量0.810
一次风温0.961一次风压0.785
给水温度0.950二次风总量0.777
一次风总量0.941给水压力0.760
主蒸汽压力0.869出口烟气含氧量0.753
分离器出口蒸汽压力0.865中间点过热度0.716
总燃料量0.835二次风压0.694
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The effect of the number of input parameters on the predictive model

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输入参数个数δRMSE
68.681 4
88.524 9
98.299 5
107.771 4
118.450 6
128.764 0
), ArticleFig(id=1211002421812261888, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=CN, label=表4, caption=

输入参数个数对预测模型的影响

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输入参数个数δRMSE
68.681 4
88.524 9
98.299 5
107.771 4
118.450 6
128.764 0
), ArticleFig(id=1211002421929701382, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=EN, label=Tab.5, caption=

Optimization parameters of the improved grey wolf algorithm

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改进灰狼算法优化参数约束范围
隐藏层节点数[10, 80]
学习率[0.001, 0.01]
正则化参数L2[0.000 1, 0.001]
), ArticleFig(id=1211002422038753294, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=CN, label=表5, caption=

改进灰狼算法优化参数

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改进灰狼算法优化参数约束范围
隐藏层节点数[10, 80]
学习率[0.001, 0.01]
正则化参数L2[0.000 1, 0.001]
), ArticleFig(id=1211002422131027987, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=EN, label=Tab.6, caption=

Comparison of prediction performance of different predictive models

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模型δRMSE/℃δMAE/℃δMAPE/%
训练集测试集训练集测试集训练集测试集
LSTM8.851 19.836 15.598 97.744 61.432.05
BiLSTM8.861 59.205 35.505 66.635 41.411.76
MGWO-BiLSTM6.422 28.865 94.017 66.197 21.021.62
), ArticleFig(id=1211002422235885595, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=CN, label=表6, caption=

不同预测模型的预测性能比较

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模型δRMSE/℃δMAE/℃δMAPE/%
训练集测试集训练集测试集训练集测试集
LSTM8.851 19.836 15.598 97.744 61.432.05
BiLSTM8.861 59.205 35.505 66.635 41.411.76
MGWO-BiLSTM6.422 28.865 94.017 66.197 21.021.62
), ArticleFig(id=1211002422323965986, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=EN, label=Tab.7, caption=

The model prediction performance when load is down

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模型δRMSE/℃δMAE/℃δMAPE/%
LSTM9.892 87.885 42.13
BiLSTM9.602 87.535 42.03
MGWO-BiLSTM6.206 24.379 71.18
), ArticleFig(id=1211002422458183720, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=CN, label=表7, caption=

降负荷时模型预测性能

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模型δRMSE/℃δMAE/℃δMAPE/%
LSTM9.892 87.885 42.13
BiLSTM9.602 87.535 42.03
MGWO-BiLSTM6.206 24.379 71.18
), ArticleFig(id=1211002422567235632, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=EN, label=Tab.8, caption=

The model prediction performance when the load is stable

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模型δRMSE/℃δMAE/℃δMAPE/%
LSTM3.415 62.841 00.69
BiLSTM2.263 51.910 90.46
MGWO-BiLSTM1.713 01.404 80.34
), ArticleFig(id=1211002422701453364, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=CN, label=表8, caption=

稳定负荷时模型预测性能

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模型δRMSE/℃δMAE/℃δMAPE/%
LSTM3.415 62.841 00.69
BiLSTM2.263 51.910 90.46
MGWO-BiLSTM1.713 01.404 80.34
), ArticleFig(id=1211002422806310972, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=EN, label=Tab.9, caption=

The model prediction performance when load raises

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模型δRMSE/℃δMAE/℃δMAPE/%
LSTM4.439 23.498 40.87
BiLSTM4.352 03.343 20.83
MGWO-BiLSTM3.456 02.404 30.60
), ArticleFig(id=1211002422936334407, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1211002409392927278, language=CN, label=表9, caption=

升负荷时模型预测性能

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模型δRMSE/℃δMAE/℃δMAPE/%
LSTM4.439 23.498 40.87
BiLSTM4.352 03.343 20.83
MGWO-BiLSTM3.456 02.404 30.60
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基于改进灰狼算法优化双向长短时记忆神经网络的水冷壁壁温预测
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詹毅 1 , 冯磊华 1 , 杨锋 2 , 钟信 1
热力发电 | 发电技术论坛 2024,53(1): 188-196
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热力发电 | 发电技术论坛 2024, 53(1): 188-196
基于改进灰狼算法优化双向长短时记忆神经网络的水冷壁壁温预测
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詹毅1 , 冯磊华1 , 杨锋2, 钟信1
作者信息
  • 1.长沙理工大学能源与动力工程学院,湖南 长沙 410114
  • 2.华自科技股份有限公司,湖南 长沙 410006
  • 詹毅(1999),男,硕士研究生,主要研究方向为热工过程控制建模与优化控制,

通讯作者:

冯磊华(1980),女,博士,副教授,主要研究方向为热工过程建模与优化控制,
Prediction of water wall temperature based on improved grey wolf optimizer and bidirectional long and short term memory network
Yi ZHAN1 , Leihua FENG1 , Feng YANG2, Xin ZHONG1
Affiliations
  • 1.School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China
  • 2.HNAC Technology Co., Ltd., Changsha 410006, China
出版时间: 2024-01-25 doi: 10.19666/j.rlfd.202305076
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提出一种基于改进灰狼(MGWO)算法优化双向长短时记忆(BiLSTM)神经网络的水冷壁壁温预测模型,灰狼算法采用非线性因子调整策略、自适应位置更新策略和动态权重修改策略进行改进以提升算法的全局寻优能力,利用改进灰狼算法优化BiLSTM模型的隐藏层数量、学习率和正则化参数以提高模型的预测精度,采用新疆某电厂的数据进行预测仿真,结果表明:改进后的算法预测精度更高,在机组升、降负荷时,均可以预测到壁温的变化趋势,模型的平均均方根误差相比于长短时记忆(LSTM)神经网络、BiLSTM模型分别降低了9.86%和3.69%,且可以提前预测到水冷壁壁温的超温情况,对于预防水冷壁超温有重要意义。

水冷壁  /  壁温预测  /  双向长短时记忆神经网络  /  改进灰狼算法  /  自适应位置更新

An improved grey wolf optimizer (MGWO) is used to optimize BiLSTM to predict water wall temperature. The improved algorithm adopts nonlinear factor adjustment strategy, adaptive position update strategy and dynamic weight modification strategy to improve the global optimization ability of the GWO. The improved grey wolf optimizer is used to optimize the number of hidden layers, learning rate and regularization parameters of the BiLSTM model to improve the prediction accuracy of the model. The data of a power plant in Xinjiang are used for prediction simulation. The results show that, the improved optimizer has higher prediction accuracy, and can predict the change trend of wall temperature when the unit is lifting and lowering load. Compared with the LSTM and BiLSTM models, the average root mean square error of the model reduces by 9.86% and 3.69%, respectively, and the overtemperature of water wall temperature can be predicted in advance, which is of great significance for the prevention of overtemperature of water wall.

water wall  /  prediction of wall temperature  /  bidirectional long and short term memory neural network  /  improved grey wolf optimizer  /  adaptive location updates
詹毅, 冯磊华, 杨锋, 钟信. 基于改进灰狼算法优化双向长短时记忆神经网络的水冷壁壁温预测. 热力发电, 2024 , 53 (1) : 188 -196 . DOI: 10.19666/j.rlfd.202305076
Yi ZHAN, Leihua FENG, Feng YANG, Xin ZHONG. Prediction of water wall temperature based on improved grey wolf optimizer and bidirectional long and short term memory network[J]. Thermal Power Generation, 2024 , 53 (1) : 188 -196 . DOI: 10.19666/j.rlfd.202305076
近年来我国超(超)临界机组发展迅速,但锅炉水冷壁管、过热器管、再热器管和省煤器管四管爆管问题仍时有发生[1]。特别是随着新能源发电的大规模并网,火力发电机组负荷快速、频繁、大幅波动已成为新常态[2],更进一步加剧了(四管)爆管问题,对机组安全造成了严重的影响[3]。研究表明,引起受热面爆管的原因为受热面长时间超温运行[4-5]、高温腐蚀[6-7]、垢下腐蚀[8]及锅炉水处理不当[9]等,其中水冷壁管超温是造成水冷壁爆管的主要原因。因此,建立准确、快速预测水冷壁壁温的模型,对于保障机组的运行安全尤为重要。
目前对于水冷壁壁温的控制与预防,主要分为3个方面:1)通过实际测量技术及壁温测点直接得到壁温数据[10],此类方法可以快速、精准测算出壁温温度,但是炉膛内燃烧情况多变,容易出现仪器损毁或者测量数据丢失等情况;2)通过数值模拟或依据测量数据,计算炉膛内负荷和工质水动力的变化,建立炉膛数值模型,计算水冷壁壁温[11-12],此类方法对于受热面的传热计算模型大都经过简化处理,或者是在稳态工况下进行计算的,很难准确得到锅炉负荷发生变化时的受热面壁温;3)基于人工智能、模糊识别、机器学习等方法得到水冷壁壁温的预测模型[13-14]。传统的以人工智能算法和机器学习为核心的壁温预测方法(如ANN、ELM、SVM、BP神经网络),在处理非线性问题方面表现较大优势,但面对水冷壁壁温这类与机组蓄热相关的强时序问题时,预测效果不佳。
近年来,卷积神经网络(CNN)和长短时记忆(LSTM)神经网络被广泛用于处理时间序列的问题,前者更适用于图像分类的工作,而后者在时间序列预测方面具有更广泛的运用[15]。水冷壁壁温受水、煤、风多种因素影响同时锅炉蓄热也对壁温影响较大,要想准确预测水冷壁壁温,需要充分挖掘数据中存在的信息。其中,双向长短时记忆(BiLSTM)神经网络对数据挖掘更加充分,可以从前向和后向同时传递信息,在处理多维输入数据和长时间序列面前更具优势。同样地,神经网络在超参数的选取方面也很重要,隐藏层数量、学习率和正则化参数等超参数对模型的预测结果具有较大的影响,现有选取方法以手动调节为主且主要依靠经验进行选取,因此较容易错过最优参数组合。将各种元启发式算法结合神经网络自动寻优最佳超参数组合是一种解决途径。灰狼算法是一种新型优化算法,灰狼算法在最优解方面比遗传算法、粒子蚁群等元启发式算法具有更高的收敛速度和精度[16],但灰狼算法在进化后期容易出现早熟和局部收敛的问题,因此需要对其进行改进,再用来寻找BiLSTM神经网络的最优超参数组合。
综上,本文利用BiLSTM神经网络预测水冷壁管壁温度(壁温),并通过改进灰狼优化(MGWO)算法对模型参数进行寻优,以提升其预测精度和泛化能力。该方法通过灰色关联度分析影响水冷壁壁温的相关因素,选取高相关度因素作为输入变量,并利用MGWO算法优化BiLSTM模型隐藏层、学习率、正则化参数,最终输出壁温预测结果。
LSTM神经网络是递归神经网络的改进版本,适合处理时间序列中间隔和延迟非常长的重要事件[17],解决了传统RNN中的梯度消失或者爆炸问题。但是传统LSTM神经网络总是对数据从前到后进行训练,即水冷壁壁温参数在LSTM模型中是按照时间序列从前到后进行训练,这种训练方式对数据的利用率不高,不能充分挖掘数据内在特征。
BiLSTM神经网络由2个LSTM神经网络组成,其可以利用过去和未来的状态来提高预测的准确性[18]。因此BiLSTM模型能将当前壁温数据同过去和未来的数据产生联系,对当前壁温模型进行修正以提高预测精度。BiLSTM模型如图1所示。与传统LSTM神经网络相比,其构建了一个前向和后向传播的双向递归神经网络,有效克服了LSTM神经网络数据信息不足的缺点。
对于BiLSTM神经网络,前向传播层和后向传播层分别从1~tt~1进行计算,并在每个时刻保持各自的状态,最终由前向层和后向层各时刻对应的输出值叠加得到相应的壁温值。具体数学表达式为:
ht=f(W1xt+W2ht1)
ht'=f(W3xt+W5ht1)
ot=g(W4xt+W6ht')
式中:htht′分别为前向、后向隐藏层状态;W1W6为共享权重。
灰狼优化(grey wolf optimization,GWO)算法是澳大利亚学者Mirjalili[19-20]受狼群猎食行为的启发所提出来的,该算法具有控制参数较少、搜索效率高、收敛速度快等特点。对于标准GWO算法,它的位置更新方程仅凭α狼引导,因此其局部寻优能力强而全局探索能力弱;此外收敛因子α会在一定程度影响到算法的全局寻优能力和局部寻优能力之间的平衡性,且标准GWO算法设置的是随迭代次数从2线性递减到0。然而在针对水冷壁壁温预测分析上,由于算法的搜索过程较为复杂,线性收敛因子很难适应实际搜索情况,容易使算法陷入局部最优解,因此,本文对标准GWO算法提出以下改进措施:
1)非线性收敛因子调整策略 收敛因子α的不同更新策略会对算法性能产生极大的影响[21-22],而且线性策略往往不是最有效的[23],因此本文提出一种非线性收敛因子更新方式为:
a=1tanh((tK1T)/(K2T))
式中:K1K2为调节系数,其取值范围为(0,1);t为当前迭代次数;T为最大迭代次数。
式(4)所示的非线性收敛因子更新策略,调整K1K2取值即可改变收敛因子α的非线性特征。若发现训练后的水冷壁壁温数据出现过拟合现象或者模型出现局部最优解,可增大K1及降低K2值,降低收敛因子α的前期递减速率,使算法的全局寻优能力得到加强;后期递减速率加快,加强算法的收敛速度。反之,则降低K1及增大K2值。经过仿真模拟最终确定K1的值为0.6,K2的值为0.1。
2)自适应位置更新策略 在实际的寻优过程中,α狼更可能为最优解。为突出最优狼对种群的全局领导能力及强化算法的全局搜索能力,在位置更新过程中逐步增加α狼的权重,其数学表达式如下:
X(t+1)=X1+X2+X33(1tT)+WX1tT
W=sin(πt2T)
3)修改动态权重策略 文献[24]指出,传统GWO算法中X1X2X3求平均值的方式不能体现αβδ三者间的重要程度,因此采用一种基于改进步长欧氏距离的比例权重为:
W1=|X1||X1|+|X2|+|X3|
W2=|X2||X1|+|X2|+|X3|
W3=|X3||X1|+|X2|+|X3|
结合式(5)的自适应位置更新策略,改进后的灰狼位置更新方式可表示为:
X(t+1)=W1X1+W2X2+W3X33(1tT)+WX1tT
本文主要对灰狼算法的收敛因子、位置更新及动态权重3个方面进行改进,理论上改进后MGWO算法的寻优效率会极大增强,收敛值会更加精确,算法更容易跳出局部最优解。为检验改进后的灰狼优化(MGWO)算法的有效性,需要对MGWO算法进行性能测试。
本文采用6种不同的基准测试函数对MGWO算法的性能进行检验,其中f1f2为单峰基准函数,f3f4为多峰基准函数,f5f6为固定维多峰函数[25]。基准函数的具体信息见表1,函数优化收敛曲线如图2所示。由图2可知,MGWO算法在初期可以快速收敛,且收敛效率均高于GWO算法,表明改进的非线性收敛因子提升了寻优效率。f1f2单峰基准函数中,MGWO算法的收敛精度远高于GWO算法;f3f4多峰基准函数中,MGWO算法可以求得最优解0;f5f6固定维多峰函数中,MGWO算法可以很快跳出局部最优,而GWO算法陷入局部最优解,表明改进策略可以使算法有效跳出局部最优解。对比GWO算法,MGWO算法的收敛值更接近理论最优值,表明改进后的函数有效地提高了寻优精度,且减少了算法进入局部最优解的概率。
因此,MGWO算法可以有效提升BiLSTM神经网络的性能,能进一步增强水冷壁壁温的预测精度。
为保证不同变量对水冷壁壁温的影响相同,且保证收敛速度及提升模型精度,需要对水冷壁壁温及相关影响因素进行归一化处理,将数据归算到[0, 1]。
x'=xxminxmaxxmin
式中:x′为归一化后的值;x为实际值;xmaxxmin分别为变量的极大值和极小值。
本文采取在壁温预测中常被使用的评价指标平均绝对误差δMAE、平均绝对百分比误差δMAPE和均方根误差δRMSE对水冷壁壁温预测模型性能进行评估,其计算如式(12)—式(14):
δMAE=1ni=1n|yiyi'|
δMAPE=100%ni=1n|(yiyi')/yi|
δRMSE=1ni=1n(yi'yi)2
式中:n为预测数;yi为水冷壁温真实值;yi′为水冷壁温预测值。
灰色关联度分析[26]是一种多因素统计分析方法,它可以有效地处理非线性和不确定问题,比较适合分析锅炉壁温与其他因素相关性之类的非线性问题。灰色关联分析的主要任务是根据水冷壁壁温的几何曲线变化趋势,分析确定各因素的影响,研究壁温与其他影响因素之间的相似性。其关联系数ζi可表示为:
ζi(k)=miniminkΔr+ρmaximaxkΔrΔr+ρmaximaxkΔr
式中:Δr=|x0(k)–xi(k)|ρ为分辨系数,通常取0.5。
为了反映比较序列与水冷壁壁温序列之间的关联关系,求出比较序列所有关联系数的均值,称为关联序列r0i,关联序列r0i越大,相关性越强[27],具体计算公式如下:
r0i=1mk=1mζi(k)
式中:m为元素个数;下标“0”表示水冷壁壁温序列;i表示比较序列。
本文研究对象为新疆准东地区某电厂超超临界660 MW锅炉,该锅炉为一次中间再热、超超临界压力变压运行、单炉膛、平衡通风、固态排渣、全钢架、全悬吊结构、紧身封闭布置的Π型锅炉,采用四角切圆燃烧方式,主燃烧器布置在水冷壁的四角。选取该电厂2021年8月18日至2021年8月24日的实测数据作为数据集。因水冷壁壁温数据时效性较强,故每30 s进行一次采样,剔除异常数据后共包含18 000组数据。预测模型中应用的训练集、测试集选取见表2
引起壁温超温的因素很多,其中最直接的影响因素分为烟气侧和工质侧2个方面。烟气侧主要与炉膛热负荷和配风有关,工质侧主要与给水有关。经查阅相关文献后,初步确定机组功率、总燃料量、锅炉出口烟气含氧量、主蒸汽压力、主蒸汽温度、给水流量、给水温度、给水压力、分离器出口壁温、分离器出口蒸汽压力、一次风风量、一次风风温、一次风风压、二次风风量、二次风风压、中间点过热度等16个变量作为影响水冷壁壁温的初选变量,并将其设置为比较序列,取一测点水冷壁壁温作为参考序列。根据式(15)及式(16),将灰色关联度计算结果按从大到小汇总,计算结果见表3
为确定水冷壁温预测模型最优输入参数的个数,需要对模型的输入变量个数进行试验,以确定最佳输入参数个数。试验模型为MGWO-BiLSTM,试验结果见表4
表4可见,当输入参数个数为10时模型的δRMSE最小,即输入变量选择10个可以提高模型的预测精度。最终确定MGWO-BiLSTM模型的输入变量为主蒸汽温度、分离器壁温、一次风温、给水温度、一次风总量、主蒸汽压力、分离器出口蒸汽压力、总燃料量、机组功率、给水流量;输出变量为水冷壁壁温。
运用灰色关联度对影响水冷壁温的相关因素进行筛选,将相关度高的因素作为输入变量输入神经网络,然后让改进灰狼算法对BiLSTM神经网络的隐藏层数量、学习率和正则化参数进行全局寻优,其约束条件见表5,最后输出预测变量为水冷壁壁温,MGWO-BiLSTM预测模型求解的流程图如图3所示。
为验证本文提出的MGWO-BiLSTM预测模型的准确性,现将LSTM模型、BiLSTM模型、MGWO-BiLSTM模型分别对水冷壁壁温进行预测分析。图4为所有数据集上的预测曲线,包含8月18日—8月22日的训练集预测曲线和8月23日—8月24日的测试集预测曲线,表6为不同模型间的预测性能比较。
图4可以看出:在训练集(8月18日—8月22日的数据)中3种模型的预测值与实际值相比整体趋于一致,但当机组降负荷时(如断面1所示),LSTM模型和BiLSTM模型并不能精确地预测到壁温的变化趋势;预测集中LSTM模型和BiLSTM模型没有预测到水冷壁超温的情况,而MGWO-BiLSTM模型有效预测到了水冷壁壁温超温。且由表6可知,MGWO-BiLSTM模型的δRMSEδMAEδMAPE均低于前2个模型,其模型的δRMSE(测试集)相比于LSTM、BiLSTM模型分别降低了9.86%和3.69%。为了更清楚地观测其预测效果,分别选取图4中的3个断面进行放大分析,断面1为机组降负荷时的预测曲线,断面2为机组稳定负荷时的预测曲线,断面3为机组升负荷时的预测曲线,其结果分别如图5图7所示,对应的模型预测性能见表7表9
图5可知,机组在降负荷时,前2种模型的预测效果不太理想,预测精度较差,而MGWO-BiLSTM模型可以稳定地预测到降负荷时壁温的变化趋势。同时,由表7可见,MGWO-BiLSTM模型的δRMSE为6.206 2 ℃,δMAE为4.379 7 ℃,δMAPE为1.18%。相比于LSTM模型和BiLSTM模型,其δRMSE分别降低了37.26%、35.37%;δMAE分别降低了44.46%、41.88%;δMAPE分别降低了44.6%、41.87%。结果表明,MGWO-BiLSTM模型对机组降负荷下的预测适应性较好,在机组进行调峰而频繁升降负荷的环境下有较大的优势。
图6可得,机组在稳定负荷或负荷保持不变时,LSTM模型、BiLSTM模型、MGWO-BiLSTM模型对壁温的预测效果都较好。观察表8发现MGWO-BiLSTM模型的误差更小,其δRMSE仅为1.713 0 ℃,同时δMAEδMAPE分别为1.404 8 ℃和0.34%。
图7可得,机组在升负荷时,3个模型对壁温的预测值均比较好。同时,由表9可见,MGWO-BiLSTM模型的δRMSEδMAEδMAPE均最小,分别为3.456 0 ℃、2.404 3 ℃、0.60%。结果表明,MGWO-BiLSTM模型无论是在机组升、降负荷,还是在机组保持稳定负荷时,均对水冷壁壁温的预测效果较好。
本文采用新疆某电厂历史运行数据作为训练数据,并将预测结果与LSTM和BiLSTM神经网络等常用时间序列壁温预测方法进行对比。以δRMSEδMAEδMAPE为评价指标,验证本文所提出的MGWO-BiLSTM神经网络模型的预测精度和准确度,并得出以下结论。
1)相对于传统预测模型,MGWO-BiLSTM模型可以充分发掘水冷壁壁温的时序特征,且MGWO算法可以避免模型陷于局部最优,因此模型的δRMSE相比于LSTM、BiLSTM模型分别降低了9.86%和3.69%,提高了模型的预测精度。
2)机组负荷变化在50%~100%范围内,无论机组升、降负荷,MGWO-BiLSTM模型均可以很好预测水冷壁壁温的变化趋势。同时,该模型可以有效预测到机组在降负荷时可能出现的超温情况。研究成果可为研究人员改进水冷壁壁温控制系统提供了思路与参考。
  • 湖南省自然科学基金项目(2018JJ3552)
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doi: 10.19666/j.rlfd.202305076
  • 接收时间:2023-05-08
  • 首发时间:2025-12-25
  • 出版时间:2024-01-25
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  • 收稿日期:2023-05-08
基金
Natural Science Foundation of Hunan Province(2018JJ3552)
湖南省自然科学基金项目(2018JJ3552)
作者信息
    1.长沙理工大学能源与动力工程学院,湖南 长沙 410114
    2.华自科技股份有限公司,湖南 长沙 410006

通讯作者:

冯磊华(1980),女,博士,副教授,主要研究方向为热工过程建模与优化控制,
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Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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