Research On Power Reliability Of 10kV Distribution Network

As a direct link between the power system and the user,the supply reliability of 10 kV distribution network has a great impact on the overall level of the entire power industry.In our country,the development of power generation and transmission is quite mature,but the development of distribution network is relatively backward.With the increase of load,the problem of high line load rate is more obvious.When the circuit fault or power supply interruption occurs,the power grid can not realize the load transfer,resulting in the expansion of the scope of power supply.Thus the reliability of power supply is reduced.The evaluation of power reliability of distribution system is of great significance to the planning and operation of power system.According to the nature of power failure,this paper divides the power failure into two types: power failure and power outage.The main factors affecting the reliability of 10 k V distribution network are analyzed from the perspective of grid structure,power supply capability,equipment and external conditions.The reliability index of power supply and the reliability index of power supply are analyzed,and the calculating method of each index is put forward.It provides a theoretical basis for the calculation of power supply reliability.Secondly,the failure rate calculation method of single power element is studied,and on this basis,the failure rate calculation formula of component group is proposed.The depth-first search method is used to find the minimum path between load point and power point.The reliability of power supply in 10 k V distribution network is solved,the reliability assumption of distribution network is put forward,the distribution network in real area is simplified and the validity of the algorithm is verified by the actual distribution network in Qinhuangdao area.Finally,a distributed generation(DG)is integrated to the studied distribution network.And the power supply reliability of 10 kV distribution network with DG is evaluated minimum path method continually.The effect of integration of DG on the reliability of the original grid is studied.