Construction of digital twin of nuclear power plant main transformer based on fast calculation of coupling field

doi:10.3785/j.issn.1006-754X.2024.03.412

2024, Vol. 31

Issue (6): 716-724 DOI: 10.3785/j.issn.1006-754X.2024.03.412

【Special Column】Key Technologies of Design, manufacture, operation and maintenance for New Energy Equipment and Their Applications under the Carbon Peaking and Carbon Neutrality Goals

Construction of digital twin of nuclear power plant main transformer based on fast calculation of coupling field

Yang XUE(

),Sen LIU(

),Jie Lü,Jin PENG,Hengyuan SI

Shenzhen Zhongguang Nuclear Engineering Design Co. , Ltd. , Shenzhen 518000, China

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Abstract

Aiming at the low intelligence level of main transformers in nuclear power plants, the fact that the operation and maintenance still mainly rely on manual inspection and regular maintenance, and the lack of real-time prediction and evaluation means of operating state, the digital twin of the main transformer based on fast calculation of coupling field has been built. Firstly, a refined digital model of the main transformer was established and the multi-physical field real-time simulation analysis was carried out to obtain the electromagnetic field and loss distribution cloud maps of its key components. Then, in order to solve the problems that the simulation of the flow field and temperature field of the main transformer took a long time and the real-time monitoring of operating states could not be realized, a fast calculation method of coupling field was proposed. Finally, the digital twin of the main transformer was constructed by combining the proposed method with the operating state data collected by various sensors, achieving multi-dimensional, full process and panoramic state monitoring and display for the physical main transformer. The results show that the construction of digital twins can realize the real-time monitoring and predictive evaluation of the operating state of main transformers under different working conditions, which provides convenience for the operation and maintenance inspection of the main transformer and contributes to the safe and reliable operation of nuclear power plants.

Key words： nuclear power plant main transformer digital twin digital model coupling field fast calculation

Received: 05 March 2024 Published: 31 December 2024

CLC:

TM 623

Corresponding Authors: Sen LIU E-mail: xueyangani@126.com;liusen19880123@126.com

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Cite this article:

Yang XUE,Sen LIU,Jie Lü,Jin PENG,Hengyuan SI. Construction of digital twin of nuclear power plant main transformer based on fast calculation of coupling field. Chinese Journal of Engineering Design, 2024, 31(6): 716-724.

URL:

https://www.zjujournals.com/gcsjxb/10.3785/j.issn.1006-754X.2024.03.412 OR https://www.zjujournals.com/gcsjxb/Y2024/V31/I6/716

基于耦合场快速计算的核电厂主变压器数字孪生体搭建

针对核电厂主变压器智能化程度低，运维仍以人工巡检、定期维护为主，以及缺乏运行状态实时预测和评估手段的现状，搭建了基于耦合场快速计算的主变压器数字孪生体。首先，建立主变压器的精细化数字模型并开展多物理场实时仿真分析，获得了其关键部件的电磁场、损耗分布云图。然后，为解决主变压器流场和温度场仿真耗时长、无法实现运行状态实时监测的问题，提出了一种耦合场快速计算方法。最后，结合所提出的方法和各传感器采集的运行状态数据，搭建了主变压器的数字孪生体，实现了对实体主变压器多维度、全过程、全景式的状态监测与展示。结果表明，通过搭建数字孪生体可实现对不同工况下主变压器运行状态的实时监测和预测评估，为主变压器的运维巡检提供了便利，有助于核电厂的安全可靠运行。

关键词： 核电厂, 主变压器, 数字孪生, 数字模型, 耦合场, 快速计算

Fig.1 Schematic diagram of main transformer coil connection

Fig.2 Digital model of main transformer

Fig.3 Magnetic flux density distribution cloud map of each component of main transformer under rated operating condition

Fig.4 Loss distribution cloud map of each component of main transformer under rated operating condition

Fig.5 Fast calculation flow of main transformer coupling field

Fig.6 Temperature calculation flow for three nodes

Fig.7 Digital model of main transformer winding and its meshing result

Fig.8 Flow field distribution cloud map of main transformer winding

Fig.9 Temperature field distribution cloud map of main transformer winding

Fig.10 Finite element simulation results of temperature field of main transformer winding under different working conditions

Fig.11 Nodes of the first pie coil of main transformer winding

Table 1 Convective heat transfer coefficient of the first pie coil boundary node of main transformer winding

Fig.12 Fast calculation results of temperature field of main transformer winding under different working conditions

Table 2 Comparison of calculation results of different models under working condition with inlet temperature of 333 K

Fig.13 Digital twin of main transformer

Fig.14 Magnetic field distribution of main transformer winding under different working conditions

Fig.15 Temperature distribution of high voltage and low voltage windings in main transformer


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