Research On Distribution Network Reconfiguration Considering Distributed Generation

Distribution network reconfiguration is an important means to reduce line loss and improve power supply reliability.Under the premise of meeting various operating conditions of the distribution network,it can realize the change of the network topology through the operation of the line switch,which is a popular direction for the research of the distribution network.With the vigorous popularization and development of distributed generation,its connection presents a series of new challenges to the distribution network reconfiguration.How to fully consider DG operation characteristics,how to reduce the impact of power cut in distribution network failure and other issues have attracted attention from all parties.In addition,with the development of integrated energy systems,it is also an important direction of future development to comprehensively consider the problem of distribution network reconfiguration of different energy systems.This paper takes distribution network reconfiguration as the core research object,and carries out a series of research around the above-mentioned key issues.The main work is as follows(1)Aiming at the uncertainty problem caused by the large number of DGs connected to the distribution network,this paper establishes a distribution network reconfiguration model that comprehensively considers the DG uncertainty and reactive power optimization,and uses a multi-scenario probability model to divide the DG uncertainty for several deterministic scenarios.Taking economy as the goal,comprehensive consideration of power flow constraints,reconfiguration constraints,energy storage constraints,etc.form a distribution network reconfiguration mathematical model.The modified IEEE33 node is used as a case to analyze and verify the validity and correctness of the proposed model.(2)Aiming at the problem of rapid recovery after a distribution network failure,this paper proposes a post-disaster emergency response strategy for a comprehensive energy distribution network that considers a dynamic transportation network.Firstly,the load of the distribution network is restored by adjusting the output of gas turbines and the network reconfiguration based on the number of distributed power sources.Secondly,according to the distribution network structure and load recovery after the network reconstruction,the mobile emergency power supply selects the moving path based on the shortest path algorithm of the dynamic traffic network model.The correctness of the dynamic traffic network model is verified through a variety of simulation examples.(3)Aiming at the general direction of the future integrated energy system research,this paper proposes a disaster recovery strategy for the distribution network considering the integrated energy network.First,take the electricity-heat-gas triple supply system as the research object,consider the simultaneous supply of electricity load,heat load,and gas load,using cogeneration technology,gas boilers and electricity to gas as energy coupling equipment;secondly,for the elastic distribution network in integrated energy network adopts network reconstruction and joint operation of integrated energy network to restore the power supply of the distribution network after a disaster.A variety of failure scenarios were set up to analyze the examples,which verified the correctness of the failure recovery strategy.