面向典型负荷曲线的油浸式电力变压器动态载荷能力评估方法  

Dynamic Thermal Rating Assessment Method of Oil-immersed Power Transformers Based on Typical Load Profiles

作　　者：张琛 董旭柱 阮江军[1,2] 邓永清 陈乔峰 ZHANG Chen;DONG Xuzhu;RUAN Jiangjun;DENG Yongqing;CHEN Qiaofeng(State Key Laboratory of Power Grid Environmental Protection(Wuhan University),Wuhan 430072,Hubei province,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,Hubei Province,China)

机构地区：[1]电网环境保护全国重点实验室(武汉大学),湖北省武汉市430072 [2]武汉大学电气与自动化学院,湖北省武汉市430072

出　　处：《电网技术》2024年第8期3515-3524,I0152-I0154,共13页Power System Technology

基　　金：国家自然科学基金项目(U2066217)。

摘　　要：开展油浸式电力变压器动态载荷能力评估,保障设备安全运行条件下提高设备利用率和迎峰能力,是资产精益化管理的发展方向。该文首先分析动态温升模型的热参数,使用光纤实测的绕组热点温度数据对热参数优化并对温升估算模型进行改进,最终热点温度估算最大误差不超过3K,其次结合变压器运行工况,综合考虑热点温度、顶层油温、寿命损失及套管和分接开关最大允许电流等约束,提出了一种基于负荷循环迭代的变压器动态载荷能力评估方法,并分析了典型负荷曲线及环境温度曲线的提取方法,最后针对变压器在不同场景下的多个动态载荷能力评估应用实例进行研究,确定变压器的动态载荷能力及限制因素。结果表明,套管和分接开关最大允许电流可能成为限制变压器动态载荷能力的主要因素,较额定工况,不同场景下变压器载荷能力可提升28%以上,具有较大的载荷潜力。The development direction of asset lean management is to evaluate the power transformer's dynamic thermal rating and improve the transformer's utilization rate to ensure equipment safety.In this paper,a method for evaluating the dynamic thermal rating of the transformer is proposed to determine the dynamic load curve under different working conditions,which is combined with the operating conditions of the transformer.It comprehensively considers the constraints of hot spot temperature,top oil temperature,losses of life,bushing and on-load tap changer maximum allowable current,and so on.Meanwhile,the most sensitive constraints limiting the load are given.Firstly,by analyzing the thermal parameters of the dynamic temperature rise model,the thermal parameters and the temperature rise model are optimized according to the temperature data measured by the winding optical fiber.The maximum error of the hot spot temperature estimation does not exceed 3 K,which means the accuracy of the hot spot temperature estimation model is improved.Secondly,based on the historical data,the typical load curve and the corresponding ambient temperature curve are extracted as the input ambient temperature curve are extracted as the input parameters of the evaluation model.Finally,several application examples for transformers in different scenarios are studied to analyze the limiting factors.The results show that the maximum allowable bushing and on-load tap changer currents may become the main factors limiting the dynamic load capacity of the transformer,and the load capacity can be improved by more than 28%in different scenarios compared to the rated operating conditions,which has a large load potential.

关 键 词：油浸式电力变压器 热点温度 热参数优化 典型负荷曲线 变压器动态载荷 

分 类 号：TM721[电气工程—电力系统及自动化]