摘要
直流互感器在应用中故障率和误差率都高于交流电磁式互感器,现场中曾出现由于直流互感器数据错误导致的保护控制设备误动作事件。提出了一种应用于配网换流站的基于因果网络的直流互感器数据异常识别策略。根据换流站拓扑结构搭建电流电压互感器配置矩阵,在单套控保设备中应用多源冗余信息形成初始诊断证据库。在因果网络诊断关系式中补充证据的权重系数,避免在直接利用证据分析事件的过程中,因针对“起因”的“结果”的不同数量影响诊断结果。挖掘数据集里所隐藏的关联关系,充分利用证据的正结果和反结果信息,准确区分互感器工作异常、系统扰动和站内系统故障。该方法在直流控制保护中增加预配置的互感器工作状态检测判据,实时计算量小,具备实用性。针对配网换流站互感器进行的异常状态仿真,证明了该诊断方法的有效性和可行性。
As a whole, the failure rate and error rate of DC transformers are all higher than those of AC electromagnetic transformers, sometimes leading to maloperation of protection control equipment in the field. The paper presented a recognition strategy for abnormal working state of DC transformers in distribution network converter station using causality network method. Based on convertor station topology, a current and voltage transformer configuration matrix was set up firstly. The multi-source redundancy information was used in the equipment to form an initial diagnosis evidence base. Secondly, the weighting coefficients of the evidence were supplemented to causal network diagnostic formula to avoid the impact of the different number of “results” on “causes”. Lastly, the hidden relationships in the dataset were excavated. On the basis of the positive and negative results of the evidence, the reason of data change was deduced to make a distinction between transformer abnormal working state and power system disturbance. The proposed technique is practical by attaching the preset transformer diagnosis module to the protection and control logic in equipment, and requires smaller real-time calculation. The results of convertor substation abnormal state simulation certify feasibility and availability of the proposed diagnosis method.
作者
栾洪洲
殷伟
周飞
吕东
王冬青
LUAN Hongzhou;YIN Wei;ZHOU Fei;Lü Dong;WANG Dongqing(NARI Group Corporation (State Grid Electric Power Research Institute), Changping District, Beijing 102200, China;State Grid Suzhou Power Supply Company, Suzhou 215004, Jiangsu Province, China)
出处
《电网技术》
EI
CSCD
北大核心
2019年第8期2853-2859,共7页
Power System Technology
基金
国家重点研发计划项目(2016YFB0900900)
国家电网公司重点示范工程项目:“苏州工业园区智能电网应用示范区主动配电网综合示范工程”~~
关键词
配网换流站
直流控保设备
直流互感器
因果网络
状态诊断
保护控制
distribution network converter station
DC control and protection device
DC transformer
causal network
status diagnosis
protection and control
作者简介
栾洪洲(1971),男,工程师,研究方向为直流运行与控制;殷伟(1971),男,高级工程师,研究方向为电网调度及配网运检工作;周飞(1975),男,高级工程师,研究方向为电网调度及配网运检工作;吕东(1986),男,工程师,研究方向为电网调度及配网运检工作;通信作者:王冬青(1972),女,研究员级高级工程师,研究方向为直流运行与控制,E-mail:61516935@qq.com。
