{"title":"Key node identification and network simplification modelling method for optimal power flow analysis of active distribution network","authors":"","doi":"10.1016/j.epsr.2024.111066","DOIUrl":null,"url":null,"abstract":"<div><p>With the increasing scale of active distribution network (ADN), the power flow analysis of ADN faces with many difficulties, such as insufficient online measurement and high complexity of overall modelling. Therefore, this paper proposes a key node identification and network simplification modelling method for the optimal power flow (OPF) analysis of ADN. Firstly, a voltage extremum similarity index is proposed and combined with K-means clustering algorithm to partition the ADN into several clusters, and then a comprehensive evaluation index is constructed with the entropy weight method to identify the key nodes of each cluster. On this basis, a key node reduction procedure is established with the comprehensive index of voltage violation probability to further reduce the scale of key nodes. After that, the power supply paths between key nodes are searched by the depth-first search algorithm to construct the topology of simplified network and then an improved π-type simplification network method is proposed with load displacement principle to establish the simplified network model with low dimension. Finally, the modified IEEE 123-bus system is used to verify the effectiveness and accuracy of proposed method. The simulation results indicate that the proposed key node identification method can accurately identify the voltage extreme nodes including PV connected nodes, and the proposed network simplification method can effectively improve the efficiency of OPF analysis with guaranteed accuracy.</p></div>","PeriodicalId":50547,"journal":{"name":"Electric Power Systems Research","volume":null,"pages":null},"PeriodicalIF":3.3000,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0378779624009519/pdfft?md5=bb5fdca64111f24e612350260e755f79&pid=1-s2.0-S0378779624009519-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electric Power Systems Research","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0378779624009519","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
With the increasing scale of active distribution network (ADN), the power flow analysis of ADN faces with many difficulties, such as insufficient online measurement and high complexity of overall modelling. Therefore, this paper proposes a key node identification and network simplification modelling method for the optimal power flow (OPF) analysis of ADN. Firstly, a voltage extremum similarity index is proposed and combined with K-means clustering algorithm to partition the ADN into several clusters, and then a comprehensive evaluation index is constructed with the entropy weight method to identify the key nodes of each cluster. On this basis, a key node reduction procedure is established with the comprehensive index of voltage violation probability to further reduce the scale of key nodes. After that, the power supply paths between key nodes are searched by the depth-first search algorithm to construct the topology of simplified network and then an improved π-type simplification network method is proposed with load displacement principle to establish the simplified network model with low dimension. Finally, the modified IEEE 123-bus system is used to verify the effectiveness and accuracy of proposed method. The simulation results indicate that the proposed key node identification method can accurately identify the voltage extreme nodes including PV connected nodes, and the proposed network simplification method can effectively improve the efficiency of OPF analysis with guaranteed accuracy.
期刊介绍:
Electric Power Systems Research is an international medium for the publication of original papers concerned with the generation, transmission, distribution and utilization of electrical energy. The journal aims at presenting important results of work in this field, whether in the form of applied research, development of new procedures or components, orginal application of existing knowledge or new designapproaches. The scope of Electric Power Systems Research is broad, encompassing all aspects of electric power systems. The following list of topics is not intended to be exhaustive, but rather to indicate topics that fall within the journal purview.
• Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation.
• Transmission, spanning the broad area from UHV (ac and dc) to network operation and protection, line routing and design.
• Substation work: equipment design, protection and control systems.
• Distribution techniques, equipment development, and smart grids.
• The utilization area from energy efficiency to distributed load levelling techniques.
• Systems studies including control techniques, planning, optimization methods, stability, security assessment and insulation coordination.