摘要
传统的电力变压器DGA故障诊断方法,仅能二值化地判断设备处于健康或故障状态,无法表征变压器的潜在故障情况,也无法确定变压器向故障状态转化的趋势。对此,提出了一种基于聚类和时间序列分析的变压器状态评价方法。首先,基于点密度判据进行数据预处理,消除噪声影响。其次,基于大数据聚类思想,计算采样数据和历史故障数据簇的相对邻近度,根据计算结果将设备状态划分为健康、潜伏故障或故障。在此基础上判断故障设备的故障类型,基于故障类型关联权重计算健康设备的健康得分,通过时间序列相似性分析方法获取潜伏故障设备的预测故障发展时间。算例分析验证了该方法的可行性与有效性。
Conventional DGA fault diagnosis methods of power transformer can only judge whether the equipment is in normal or fault condition,but they can neither characterize the potential failure of the normal transformer nor identify the trend of transformer converted into fault state.In order to solve this problem,this paper proposes a transformer state evaluation method based on clustering and time series analysis method.Firstly,the data preprocessing method is carried out to prevent the influence of noise.Then,based on big data clustering method,the proximity of sampled data and historical fault data clusters is calculated.Based on the result,the equipment condition is sorted into healthy,incipient faulty or faulty.For equipment in faulty state,the fault type is identified.For healthy equipment,the health score is calculated based on related weights of fault types.For incipient faulty equipment,the time series similarity analysis method is used to further predict the time span for the equipment changing from current state to fault state.The example analysis verifies the feasibility and effectiveness of the proposed method.
作者
辛建波
康琛
翁新林
陈田
谢斌
郭创新
XIN Jianbo;KANG Chen;WENG Xinlin;CHEN Tian;XIE Bin;GUO Chuangxin(Electric Power Research Institute,State Grid Jiangxi Electric Power Co.,Ltd,Nanchang 330000,China;Maintenance Branch,State Grid Jiangxi Electric Power Co.,Ltd,Nanchang 330000,China;State Grid Jiangxi Electric Power Co.,Ltd,Nanchang 330000,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2019年第3期64-70,共7页
Power System Protection and Control
基金
国家自然科学基金重点项目资助(51537010)"多重不确定因素下的智能电网风险调度理论与方法研究"
国网科技项目资助(52182016001J)"输变电设备健康诊断与故障预警云服务平台研究与应用项目"~~
