Evaluation On Economy And Reliability Of MV Distribution Network Based On Operation Model

In order to analyze the distribution network scientifically, discover theproblems hidden and improve power industry technology and management level,evaluating the economy and reliability of medium voltage distribution networkbased on operation model is very necessary.The economy and reliability are two most important issues in the operationsystem. So this paper researches the operation states focusing on these majoraspects, and completes the study achievements as follows:Combining with the operation index——load rate, this paper presents amethod to evaluate the operation economy of different connection modes. Theproposed method establishes the relationship between comprehensive year costand load rate, and obtains operation economy index of different connectionmodes based on different load rate. The year cost for unit load is used as theoperation economy index.Considering the historical operation conditions, real-time operating stateand real-time operating environment, this paper puts forward a new algorithmabout reliability of MV distribution network elements based on operationmodel.The algorithm could evaluate the reliability of transmission line,transformer and switchgear online. Analysis of examples indicates that this newalgorithm could respond well to the variation of real-time operation conditionsand meet the demand of online assessment.This paper put forward a new algorithm about reliability of MV distributionsystem on the basis of the evaluation result on the element reliability. Thisalgorithm could respond well to the variation of real-time operation conditionssuch as climate condition, power flow, network structure, operation mode and soon.This algorithm could result in high computation speed, and could meet thedemand of online assessment.This paper develops the software named “distribution network reliabilityonline assessment system” which could be used in offline and online assessment.The evaluation system receives real-time datas as power flow,climate condition, network structure, operation mode and so on, then evaluatesthe operation reliability.The evaluation results could supply decision support forthe dispatcher. Analysis of examples indicates that the system could meet thedemand of online assessment.