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A hybrid prediction model combining enhanced grey wolf optimization algorithm (EGWO) and long short-term memory (LSTM) neural network is proposed to address the problem of low accuracy in predicting the mass concentration of NOx at the outlet of selective catalytic reduction (SCR) denitrification reactors using conventional mechanism modeling methods. Firstly, based on principal component analysis (PCA), the raw data is processed and filtered to achieve dimensionality reduction of input variables. Then, the EGWO is used to optimize the hyperparameters of LSTM. Finally, the input variables are used as inputs for the EGWO-LSTM model to predict the mass concentration of NOx at the outlet. Taking a 1 000 MW ultra supercritical thermal power unit in China as an example, simulation results show that the proposed model performs the best in error control, with root mean square error reduces by 50.36% compared to the conventional LSTM model, and by 76.14% compared to the BP model, and the mean absolute percentage error of the model is only 1.01%. The EGWO has fewer iterations and higher convergence accuracy compared to the GWO when converging to the optimal solution.
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针对传统机理建模方法预测选择性催化还原技术(SCR)脱硝反应器出口NOx质量浓度精度不高的问题,提出了一种结合增强型灰狼优化算法(EGWO)与长短时记忆(LSTM)神经网络的混合预测模型。首先,基于主成分分析(PCA)对原始数据进行处理与筛选,实现输入变量的降维。然后,利用EGWO优化LSTM神经网络的超参数。最终,将输入变量作为EGWO-LSTM模型的输入,预测出口NOx质量浓度。以国内某超超临界1 000 MW火电机组为例,仿真结果表明,该模型在误差控制方面表现最优,均方根误差较传统LSTM模型下降50.36%,较BP模型下降76.14%,模型平均绝对百分比误差仅为1.01%。EGWO相对于GWO收敛至最优解时的迭代次数更少,且具有更高的收敛精度。
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, authorsList=吴磊, 顾华, 姚一鸣, 张军, 苏军, 陈依)}, authors=[Author(id=1217836028170256506, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=1784646353@qq.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1217836028287697027, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, authorId=1217836028170256506, language=EN, stringName=Lei WU, firstName=Lei, middleName=null, lastName=WU, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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吴磊(1996),男,硕士,助理工程师,主要研究方向为非线性系统建模、控制与优化,电网运维,1784646353@qq.com。
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吴磊(1996),男,硕士,助理工程师,主要研究方向为非线性系统建模、控制与优化,电网运维,1784646353@qq.com。
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31(12): 2140-2148., articleTitle=Prediction of pH value of slurry based on variable selection and MGWO-LSTM, refAbstract=null)], funds=[Fund(id=1217836034260386239, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, awardId=61273190, language=EN, fundingSource=National Natural Science Foundation of China(61273190), fundOrder=null, country=null), Fund(id=1217836034348466629, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, awardId=61273190, language=CN, fundingSource=国家自然科学基金项目(61273190), fundOrder=null, country=null), Fund(id=1217836034453324233, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, awardId=13DZ2273800, language=EN, fundingSource=Funding Project of Shanghai Key Laboratory of Power Station Automation Technology(13DZ2273800), fundOrder=null, country=null), Fund(id=1217836034579153361, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, awardId=13DZ2273800, language=CN, fundingSource=上海市电站自动化技术重点实验室资助项目(13DZ2273800), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1217836027847295067, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, xref=1., ext=[AuthorCompanyExt(id=1217836027851489372, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, companyId=1217836027847295067, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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Structure diagram of the LSTM neural network, figureFileSmall=ExfecHuqh87RXy8cf2Ktvg==, figureFileBig=PuZuWrMFc4ux30QTd4S9Xw==, tableContent=null), ArticleFig(id=1217836032939180413, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, language=CN, label=图1, caption=
LSTM神经网络结构示意, figureFileSmall=ExfecHuqh87RXy8cf2Ktvg==, figureFileBig=PuZuWrMFc4ux30QTd4S9Xw==, tableContent=null), ArticleFig(id=1217836033127924103, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, language=EN, label=Fig.2, caption=
Hierarchical diagram of grey wolf social hierarchy system, figureFileSmall=8zqWv8oTvpH22UCIKDMoUA==, figureFileBig=2eYWgXLI3dyaGdtSLRhX8w==, tableContent=null), ArticleFig(id=1217836033245364623, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, language=CN, label=图2, caption=
灰狼等级制度分级, figureFileSmall=8zqWv8oTvpH22UCIKDMoUA==, figureFileBig=2eYWgXLI3dyaGdtSLRhX8w==, tableContent=null), ArticleFig(id=1217836033362805139, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, language=EN, label=Fig.3, caption=
Framework diagram of the EGWO-LSTM prediction model, figureFileSmall=wqCFxmjZ2PaHgKIgQG3dCw==, figureFileBig=1jTSqa5lB1p3n+DJL6Sn7A==, tableContent=null), ArticleFig(id=1217836033476051354, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, language=CN, label=图3, caption=
EGWO-LSTM预测模型框架结构, figureFileSmall=wqCFxmjZ2PaHgKIgQG3dCw==, figureFileBig=1jTSqa5lB1p3n+DJL6Sn7A==, tableContent=null), ArticleFig(id=1217836033580908959, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, language=EN, label=Fig.4, caption=
Changes in the fitness of each model, figureFileSmall=bmHcuPT94Him2scBhRbgNQ==, figureFileBig=cBI0MN2MD8htDCujDl63vA==, tableContent=null), ArticleFig(id=1217836033673183651, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, language=CN, label=图4, caption=
各模型适应度变化, figureFileSmall=bmHcuPT94Him2scBhRbgNQ==, figureFileBig=cBI0MN2MD8htDCujDl63vA==, tableContent=null), ArticleFig(id=1217836033790624166, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, language=EN, label=Tab.1, caption=
The eigenvalues and cumulative contribution rates corresponding to each principal component
, figureFileSmall=null, figureFileBig=null, tableContent=
| 各主成分 | 特征值 | 贡献率/% | 累计贡献率/% |
|---|
| SCR入口NOx质量浓度 | 8.127 1 | 0.406 3 | 0.406 3 |
| 锅炉负荷 | 4.115 8 | 0.205 7 | 0.612 0 |
| SCR入口温度 | 1.974 7 | 0.097 5 | 0.709 5 |
| SCR入口烟气氧量 | 1.396 4 | 0.069 6 | 0.779 1 |
| SCR入口烟气量 | 1.001 9 | 0.050 2 | 0.829 3 |
| NH3入口流量 | 0.797 1 | 0.039 8 | 0.869 1 |
), ArticleFig(id=1217836033916453294, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, language=CN, label=表1, caption=
各主成分对应的特征值和累计贡献率
, figureFileSmall=null, figureFileBig=null, tableContent=
| 各主成分 | 特征值 | 贡献率/% | 累计贡献率/% |
|---|
| SCR入口NOx质量浓度 | 8.127 1 | 0.406 3 | 0.406 3 |
| 锅炉负荷 | 4.115 8 | 0.205 7 | 0.612 0 |
| SCR入口温度 | 1.974 7 | 0.097 5 | 0.709 5 |
| SCR入口烟气氧量 | 1.396 4 | 0.069 6 | 0.779 1 |
| SCR入口烟气量 | 1.001 9 | 0.050 2 | 0.829 3 |
| NH3入口流量 | 0.797 1 | 0.039 8 | 0.869 1 |
), ArticleFig(id=1217836034021310898, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, language=EN, label=Tab.2, caption=
Performance comparison of different models
, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型 | δRMSE/(mg·m–3) | δMAPE/% | 训练模型耗时/s |
|---|
| PCA-LSTM2 | 1.37 | 2.03 | 429.85 |
| PCA-GWO-LSTM2 | 1.12 | 1.65 | 267.73 |
| PCA-EGWO-LSTM2 | 0.68 | 1.01 | 189.06 |
| PCA-LSSVM | 2.38 | 3.52 | 596.70 |
| PCA-BP | 2.85 | 4.21 | 837.65 |
), ArticleFig(id=1217836034142945719, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836024844174283, language=CN, label=表2, caption=
不同模型的预测性能对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型 | δRMSE/(mg·m–3) | δMAPE/% | 训练模型耗时/s |
|---|
| PCA-LSTM2 | 1.37 | 2.03 | 429.85 |
| PCA-GWO-LSTM2 | 1.12 | 1.65 | 267.73 |
| PCA-EGWO-LSTM2 | 0.68 | 1.01 | 189.06 |
| PCA-LSSVM | 2.38 | 3.52 | 596.70 |
| PCA-BP | 2.85 | 4.21 | 837.65 |
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