Research On Optimization Layout Method Of Distribution Automation Terminal Based On Reliability Evaluation Of Distribution System

With the development of economy and society,users have higher requirements for power supply reliability of distribution systems.Distribution automation(DA)is an effective way to improve the reliability of distribution networks.The continuous deepening application of DA promots the distribution to gradually develop from traditional physical system into cyber physical distribution system.Widespread application of information technology greatly improve s efficiency and reliability of distribution network,and also brings new operational risks.Under this circumstance,this paper calculates the power supply reliability of the distribution network considering centralized feeder automation,aiming to quantify the effect of distribution automation on the power supply reliability;on this basis,this paper proposes a distribution network reliability analytical calculation method taking into account the influence of information systems,aiming to quantify the impact of information link failure on the distribution system reliability indexes;based on the power supply reliability evaluation method,this paper establishs an optimization layout model of distribution automation termianals to provide decision support for power planners.The specific works of this paper are as follows:1.A reliability analytical evaluation method incorporating centralized feeder automation is introduced.This method divides different failure cases according to the switches type,load point and faulted branch location,and the analytical expression of ecah case is given.In this method,when calculating the power outage time of each load point,the fault location time is regarded as a time parameter that varies with the faulted branch location and the terminal installation,and the analytical expression of fault location time is given.Compared with the method ignoring the fault location time or setting the fault location time as a fixed value,the proposed method can obtain more accurate reliability evaluation results.2.A reliability analytical evaluation method considering the influence of information system is proposed.Based on the basic architecture of the power distribution information physical system,the communication reliability model of the power distribution information system is established,and the terminal failure probability is calculated.According to the centralized feeder automatic fault processing logic,the influence of terminal failure on the process of fault location,fault isolation and fault recovery is analyzed in detail.Based on this,the analytical expression of load point reliability index considering the multiple failures of the terminal is derived.The simulation results on IEEE RBTS BUS-2 verify the effectiveness of this method.3.By analyzing the relationship between distribution automation investment and income,a distribution automation terminal optimization layout model with the lowest comprehensive cost as the objective function,power supply reliability improvement requirements and initial investment cost constraints as dual constraints is established.Aiming at the premature convergence problem of ordinary genetic algorithms,a multi-group genetic algorithm is introduced to sol ve the terminal layout model.The effectiveness of the proposed model and the superiority of the multi-group genetic algorithm to solve the terminal layout problem are verified by simulation examples.The influence of investment cost constraints,crew patrolling speed,terminal price,terminal failure probability,and feeder section failure probability on the terminal layout results are analyzed in detail.