Reliability Evaluation Of Honeycomb Distribution Network

Distribution network is an important part of the power network,and its research has always been a hot spot in the power system.With the increasing popularity of distributed generation interconnection,traditional distribution networks are facing great challenges in terms of reliability and flexibility of power supply.Based on the development trend of numerous existence of microgrids in distribution network,this paper proposes the honeycomb distribution network structure with high power supply reliability for grid-connected operation of distributed generations from the perspective of microgrid cluster.Firstly,the topology and active microgrid and smart power/information exchange base station are briefly introduced,and corresponding control strategies are proposed by referring to existing distribution network control methods.Then,the power supply reliability of honeycomb distribution network is studied.This paper applies Markov chain to analyze the state transition process of honeycomb distribution network,establishes mathematical models including state transition probability matrix and probability calculation methods under different states,gives the reliability evaluation index of honeycomb distribution network with reference to existing reliability evaluation contents and methods,and deduces revised formulas of reliability index calculation suitable for honeycomb distribution network based on minimum cut set method.Next,the reliability model of the main components in the honeycomb distribution network is built and analyzed,and the corresponding reliability parameters are given.Taking the test system of IEEE-RBTS as an example,the power supply reliability of the honeycomb microgrid before and after its transformation is simulated and compared.The simulation result shows that the honeycomb microgrid has higher power supply reliability,and the power supply reliability of the load points near the base station is obviously improved.In addition,the configuration of the base station in the honeycomb distribution network is studied from the economic point of view on the premise of ensuring the reliability of the system.Considering the cost of investment and operation of base station and the cost of system outage loss,a mathematical model is established based on the principle of equivalent conversion,and the corresponding configuration programming algorithm is proposed.Based on the test system of IEEE-RBTS BUS6 F5,considering the outage loss of different types of users,the simulation analysis is carried out.The simulation result shows that base station can reduce the cost of system outage loss,improve the availability of power supply,and the economic benefits of priority configuration of base stations at important loads are relatively higher.Finally,the research contents and results of this paper are summarized,and the issues which still need further study like capacity configuration of base stations are pointed out.