Article(id=1217836020607927097, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1217836019408360416, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202501029, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1737907200000, receivedDateStr=2025-01-27, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1768284333612, onlineDateStr=2026-01-13, pubDate=1764000000000, pubDateStr=2025-11-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1768284333612, onlineIssueDateStr=2026-01-13, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1768284333612, creator=13701087609, updateTime=1768284333612, updator=13701087609, issue=Issue{id=1217836019408360416, tenantId=1146029695717560320, journalId=1210938733613449225, year='2025', volume='54', issue='11', pageStart='1', pageEnd='168', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1768284333326, creator=13701087609, updateTime=1768284453982, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1217836525543408117, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1217836019408360416, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1217836525543408118, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1217836019408360416, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=107, endPage=116, ext={EN=ArticleExt(id=1217836020830225213, articleId=1217836020607927097, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Modeling method for characterizing condenser system based on multi-fidelity data and transfer learning, columnId=1211002405299294959, journalTitle=Thermal Power Generation, columnName=Thermal energy science research, runingTitle=null, highlight=null, articleAbstract=
The effectiveness of a data-driven model relies on the completeness of its training samples. For operating conditions beyond the scope of the training samples, the model’s generalization ability is compromised. Therefore, to develop a condenser model that can adapt to the wide load variation of the unit, it is essential for the training samples to involve a diverse range of power generation loads and ambient temperatures. However, achieving this complete dataset is difficult for newly-commissioned units because of their short operation time. To address these challenges, a method for characterizing condensing units using multi-fidelity data and transfer learning is proposed, even with incomplete data. In this method, a pre-trained model is firstly built based on the comprehensive operational dataset collected from a similar unit. On the basis of the pre-trained model, additional linear and nonlinear calibration networks are introduced. The calibration networks are updated through the incomplete data of newly constructed units, enabling the transfer of the pre-training model to the feature space that is adapted to the incomplete dataset. The effectiveness of this method is validated through the condenser of a 1 000 MW supercritical unit. The results indicate that, even with limited training samples, the method accurately predicts parameters such as condenser pressure and circulating water outlet temperature, with an average R2 of 0.95, significantly outperforming the conventional data-driven model based on a single data set, of which the average R2 is only 0.81.
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数据驱动模型有效性取决于训练样本是否完备,对于样本覆盖范围外的工况,模型泛化能力较差。为构建适应机组宽负荷变化的凝汽器系统特性模型,训练样本需包括较大变化范围的发电负荷和环境温度。然而,新建机组因投运时间短,无法提供完备数据集。因此,针对不完备数据集提出了一种基于多保真度数据和迁移学习的凝汽器系统特性建模方法。该方法首先采用同类型系统的完备数据集构建预训练模型,在预训练模型上,新增线性和非线性校准网络,通过新建机组的不完备数据对校准网络进行更新,使预训练模型迁移适配不完备数据集的特征空间。最后通过某1 000 MW超临界机组凝汽器系统验证该方法有效性,验证结果表明,在训练样本不充分的情况下,该方法能准确预测凝汽器压力和循环水出口温度等参数,决定系数R2平均值为0.95,明显优于传统单一数据集数据驱动模型的R2平均值0.81。
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张逸佳(2001),男,硕士研究生,主要研究方向为凝汽器系统特性建模,220234970@seu.edu.cn。
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张逸佳(2001),男,硕士研究生,主要研究方向为凝汽器系统特性建模,220234970@seu.edu.cn。
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The modeling method based on multi-fidelity data and transfer learning, figureFileSmall=oxebvIvfRR+diOi9EeTs5w==, figureFileBig=SJvftjORquruCbnXl7VXNw==, tableContent=null), ArticleFig(id=1217836027436253244, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=CN, label=图1, caption=
基于多保真度数据和迁移学习的建模方法, figureFileSmall=oxebvIvfRR+diOi9EeTs5w==, figureFileBig=SJvftjORquruCbnXl7VXNw==, tableContent=null), ArticleFig(id=1217836027633385544, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=EN, label=Fig.2, caption=
Distributions of the dataset samples, figureFileSmall=4765fAZGRtLEZVZEaAShFw==, figureFileBig=aLkAjvEkmB/f9FB0Hir43A==, tableContent=null), ArticleFig(id=1217836027729854543, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=CN, label=图2, caption=
数据集样本分布, figureFileSmall=4765fAZGRtLEZVZEaAShFw==, figureFileBig=aLkAjvEkmB/f9FB0Hir43A==, tableContent=null), ArticleFig(id=1217836027809546324, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=EN, label=Fig.3, caption=
The model prediction performance based on limited high-fidelity data, figureFileSmall=bI3/8XIWmzqn+7bA30MuhQ==, figureFileBig=6smHUru2RrosjjJ/L2tYPA==, tableContent=null), ArticleFig(id=1217836027893432415, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=CN, label=图3, caption=
基于有限高保真数据的模型预测效果, figureFileSmall=bI3/8XIWmzqn+7bA30MuhQ==, figureFileBig=6smHUru2RrosjjJ/L2tYPA==, tableContent=null), ArticleFig(id=1217836027994095720, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=EN, label=Fig.4, caption=
The model prediction performance based on sufficient low-fidelity data, figureFileSmall=u2ELMQt9d+8V2FfGt6+Pjg==, figureFileBig=PxK0s39iZCDtGswdQgCdSw==, tableContent=null), ArticleFig(id=1217836028065398891, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=CN, label=图4, caption=
基于充分低保真数据的模型预测效果, figureFileSmall=u2ELMQt9d+8V2FfGt6+Pjg==, figureFileBig=PxK0s39iZCDtGswdQgCdSw==, tableContent=null), ArticleFig(id=1217836028140896371, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=EN, label=Fig.5, caption=
The prediction performance of multi-fidelity model, figureFileSmall=s1iCSL0SD6ZR1WM8KDI3Mg==, figureFileBig=sp0ui2DWLrwhLhErpBjcHg==, tableContent=null), ArticleFig(id=1217836028228976764, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=CN, label=图5, caption=
多保真模型预测效果, figureFileSmall=s1iCSL0SD6ZR1WM8KDI3Mg==, figureFileBig=sp0ui2DWLrwhLhErpBjcHg==, tableContent=null), ArticleFig(id=1217836028317057156, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=EN, label=Fig.6, caption=
Performance comparison between different models, figureFileSmall=aa1ciN1xH0khdrLcB3NPmQ==, figureFileBig=5J8P2CeeqWhDrerHh7r/KQ==, tableContent=null), ArticleFig(id=1217836028459663495, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=CN, label=图6, caption=
不同模型预测性能比较, figureFileSmall=aa1ciN1xH0khdrLcB3NPmQ==, figureFileBig=5J8P2CeeqWhDrerHh7r/KQ==, tableContent=null), ArticleFig(id=1217836028556132494, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=EN, label=Fig.7, caption=
Prediction values of different synthetic samples, figureFileSmall=qR0vmSPiW6h846gso5fIJQ==, figureFileBig=kksNSFTrt/0G+EEFDUrGlw==, tableContent=null), ArticleFig(id=1217836028665184409, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=CN, label=图7, caption=
合成样本预测值对比, figureFileSmall=qR0vmSPiW6h846gso5fIJQ==, figureFileBig=kksNSFTrt/0G+EEFDUrGlw==, tableContent=null), ArticleFig(id=1217836028757459102, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=EN, label=Fig.8, caption=
Comparison of error distributions, figureFileSmall=n8JW9lN7LAJQFpOsmoqjrw==, figureFileBig=IkU12bd5sYydFHPe0N6dbQ==, tableContent=null), ArticleFig(id=1217836028887482531, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=CN, label=图8, caption=
误差分布对比, figureFileSmall=n8JW9lN7LAJQFpOsmoqjrw==, figureFileBig=IkU12bd5sYydFHPe0N6dbQ==, tableContent=null), ArticleFig(id=1217836028967174317, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=EN, label=Tab.1, caption=
Input and output variables for modeling a condenser
, figureFileSmall=null, figureFileBig=null, tableContent=
| 输入变量 | 输出变量 |
|---|
| 机组负荷,MW | 凝汽器A真空压力,kPa |
| 循环水进水温度,℃ | 凝汽器B真空压力,kPa |
| 循环水流量,kg/s | 凝汽器A温度,℃ |
| 循环水进水压力,MPa | 凝汽器B温度,℃ |
| 循环水出水压力,MPa | 循环水连接管温度,℃ |
| LP汽缸A排气压力,kPa | 循环水出口温度,℃ |
| LP汽缸B排气压力,kPa | 热井出口温度,℃ |
| 冷凝水流量,kg/s | |
| 热井水位,mm | |
), ArticleFig(id=1217836029093003450, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836020607927097, language=CN, label=表1, caption=
凝汽器建模输入变量、输出变量
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| 输入变量 | 输出变量 |
|---|
| 机组负荷,MW | 凝汽器A真空压力,kPa |
| 循环水进水温度,℃ | 凝汽器B真空压力,kPa |
| 循环水流量,kg/s | 凝汽器A温度,℃ |
| 循环水进水压力,MPa | 凝汽器B温度,℃ |
| 循环水出水压力,MPa | 循环水连接管温度,℃ |
| LP汽缸A排气压力,kPa | 循环水出口温度,℃ |
| LP汽缸B排气压力,kPa | 热井出口温度,℃ |
| 冷凝水流量,kg/s | |
| 热井水位,mm | |
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