基于三维构型与电热传感的特高压换流变压器出线装置区域数字孪生模型研究

Research on Digital Twin Model of Outgoing⁃line Device Area of UHV Converter Transformer Based on Three⁃dimensional Configuration and Electro⁃thermal Sensing

特高压换流变压器出线装置区域绝缘结构复杂且体积巨大,承受大电流、高电压长时间作用,对其开展现场运维试验将耗费较大代价。目前数字孪生技术日益完善,逐渐从汽车、航空等制造业引入电力行业。基于此,文中将数字孪生技术引入特高压换流变压器高端电力设备,考虑到换流变压器本体结构复杂且其出线装置及换流变套管区域为其重要典型附件,因此重点研究该区域数字孪生3D模型构建,依据其孪生模型进行现场运维模拟试验和大电流、高电压载荷下的功能性响应分析。出线装置区域数字孪生模型依据电热耦合物理场仿真模型构建,应用电热传感器实时监测其承受在线电压、电流波形,并实现了现场运行参数与数字孪生模型加载数据之间的交互联动。另一方面,实现了数字孪生模型中材质区域智能提取辨识,并可依据物理场环境变换材料参数性能,以适应不同运行环境的结构设计与性能考核。进一步,为分析换流变套管内部暂态温度与其短时载流能力和长时老化性能间关系,提出了高压套管长时内绝缘性能评估流程方法。文中聚焦于换流变压器出线区域的数字孪生模型3D构建,其研究方法可推广延拓至换流变本体绕组结构、油纸绝缘区域与有载开关等关键部件。文中研究结果可为换流变压器本体绝缘结构设计,特别是出线装置区域的结构设计与运行维护提供理论指导和技术参考,对在线分析换流变压器出线装置区域运行中的短时载流能力和长时老化性能有一定的理论指导作用。

The insulation structure of the outgoing device area of UHV converter transformer is complex in structure and huge in volume.It is subject to the long⁃term effect of high current and high voltage and the development of operation,maintenance and test at site is at high cost.At present,the digital twin technology is becoming more and more perfect,and is gradually introduced from automobile,aviation and other manufacturing industries into the power industry.On this basis,the digital twin technology is introduced into the high⁃end power equipment of UHV converter transformer.Considering the complex structure of converter transformer proper and its outgoing line device and converter bushing area are important typical accessories,this paper focuses on the construction of digital twin 3D model in this area,and carries out on⁃site operation and maintenance simulation test and high current functional response analysis under high voltage load.The digital twin model of the outgoing device area is constructed in accordance with the electro⁃thermal coupling physical field simulation model.The electro⁃thermal sensor is used to monitor its withstanding on⁃line voltage and current waveform in real time,and the interaction activity between the on⁃site operating parameters and the loading data of the digital twin model is realized.On the other hand,the intelligent extraction and identification of material area in the digital twin model is realized,and the material parameter performance can be changed in accordance with the physical field environment so as to adapt to the structural design and performance evaluation of different operating environments.Furthermore,in order to analyze the relationship among the internal transient temperature of the converter bushing and its short⁃time current carrying capacity as well as long⁃term aging performance,an evaluation process method of the long⁃term internal insulation performance of the high⁃voltage bushing is proposed.This paper focuses on the 3D construction of digital twin model in the outgoing area of converter transformer.Its research method can be extended to such key components as the winding structure of the converter proper,oil paper insulation area and on load switch etc.The research results in this paper can provide theoretical guidance and technical reference for the insulation structure design of converter transformer body,especially for the structural design and operation maintenance of outgoing device area,and can provide some theoretical guidance for on⁃line analysis of short⁃term current carrying capacity and long⁃term aging performance of converter transformer outgoing device area.