Research On Distribution Network Reliability Modeling And Power Supply Reliability Based On Distributed Generation

With the gradual emergence of the drawbacks of the centralized power supply system in distribution network,the increasing demand of users for reliability of power supply,the increasingly prominent issue of global energy security and climate change,the distributed generation technology is obtained by virtue of its advantages of being clean,economical and reliable Vigorously develop,distributed power this energy utilization technology is being valued and adopted by more and more power users.The distributed power supply has a lot of impact on the power supply reliability of the distribution network.The traditional reliability assessment model and evaluation method are no longer applicable,the reliability assessment process becomes complicated.In order to analyze the distributed power access to users Power supply reliability,it is necessary to conduct an in-depth study on the distribution network reliability model and evaluation method with distributed generation.First of all,this paper builds a distributed power supply distribution network reliability index system.According to IEEE and China's power supply reliability index specification,the representative reliability indexes of traditional distribution network are extracted by hierarchical classification.Considering the output of distributed power and the introduction of island operation mode,And the reliability of island power supply new indicators,and the common power supply reliability index combined with the proposed new indicators to establish power supply reliability index system,which is the basis for the reliability index calculation and criteria.Secondly,the distribution network reliability model and reliability evaluation method with distributed generation are studied.In the research of reliability modeling,considering the aging characteristics of the whole life cycle of the equipment,the time-varying failure rate model is established for the traditional power equipment.For the distributed power scenery storage power generation system,taking into account the timing output and power generation system failure,In order to improve the computational efficiency,a sequential Monte-Carlo simulation method based on Latin hypercube sampling is proposed in this paper.With this method,the state of equipment and the state duration are extracted,and the system's Then use the fault isolation strategy to divide the power supply area into the power supply area of the user and divide the power supply area of the optimal island with the sequential dynamic islanding strategy to estimate the power supply reliability of the user load point.Finally,the reliability model and the evaluation algorithm mentioned above are programmed and implemented in Matlab,and applied to the actual distribution network topology of 35kV Nanmen Station in Bazhou,northern Hebei,for example analysis.Firstly,the topology and parameters of Nangameng distribution network are introduced,and the capability of scenery power generation in northern Hebei Province is evaluated.Then the reliability calculation method is verified,and the reliability model of traditional power equipment,the reliability of wind power generation and storage system Model on the distribution network reliability;Finally,based on the above model,the impact of access penetration,access location and energy storage on the reliability of distribution network is studied,Related conclusions.