摘要
电力线路周围树木生长与线路安全运行之间的矛盾(即树线矛盾)是影响乡镇配电网供电可靠性的重要因素。针对强对流天气来临之前乡镇配电网树线矛盾风险预警及清障处理需求,提出了一套“分区预警-总体权衡-优化处理”机制。首先,考虑强对流天气的地域关联特性,基于支持向量机建立了乡镇配电网各区域强对流天气-树线矛盾映射模型,实现树障接地风险的分区预警;然后,基于风险预警结果,以总体经济投入和停电损失最小为目标,建立了考虑强对流天气影响的乡镇配电网树线矛盾双层优化处理模型,决策各矛盾易发点的清障计划;最后,采用某乡镇强对流气象监测数据、树障接地故障记录以及改进的IEEE33节点系统、123节点系统进行了算例分析。结果表明,所提模型能够有效挖掘强对流天气与树线矛盾间的映射关系,并给出经济性最优的事前清障计划,实现乡镇配电网树障接地风险的分区预警及优化处理。
The transmission lines of rural distribution networks often traverse areas with high vegetation coverage.During severe convective weather,the air between the line and surrounding trees is highly susceptible to breakdown and trigger grounding faults.Therefore it is necessary to carry out early warning and clearance treatment of tree-line contradiction risks before the arrival of severe convective weather to improve the power supply reliability of the rural distribution networks.However,most of the existing studies on tree-barrier monitoring and risk early warning have been modeled in terms of the growth characteristics of the trees themselves,without considering the influence of meteorological factors.On the other hand,since time is tight before the arrival of severe convective weather and the rural power companies have limited clearance resources,the pre-clearance process also requires planned power outage,the failure probability of each tree-line contradiction prone point should be taken into account,and the cost of clearance and loss of power outage should be weighed to make a proper decision on whether to take pre-clearance measures.Aiming at these,a set of"zonal early warning,overall trade-off,optimal processing"mechanism was proposed for the tree-line contradiction of rural distribution networks before the arrival of severe convective weather.Firstly,considering the geographical correlation characteristic of severe convective weather,taking the meteorological monitoring information of the whole rural distribution network as the data to be classified,and using whether tree-barrier grounding fault occurs as the label,a mapping model of severe convective weather and tree-line contradiction in each region of the rural distribution network was established based on Support Vector Machine,so as to realize the zonal early warning of tree-barrier grounding risks;Secondly,based on the risk warning results,taking into account the constraints of clearance resources and the working time constraints of clearance teams,a t
作者
姚福星
苗世洪
涂青宇
孙芊
李丰君
Yao Fuxing;Miao Shihong;Tu Qingyu;Sun Qian;Li Fengjun(State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key Laboratory School of Electrical and Electronic Engineering Huazhong University of Science and Technology,Wuhan 430074 China;Electric Power Research Institute of State Grid Henan Electric Power Company,Zhengzhou 450052 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2023年第22期6188-6203,共16页
Transactions of China Electrotechnical Society
基金
国网河南省电力公司科技项目资助(SGHADK00PJJS2100232)。
关键词
强对流天气
乡镇配电网
树线矛盾
风险预警
优化处理
Severe convective weather
rural distribution network
tree-line contradiction
risk warning
optimization processing
