Economic Reconstruction Of Flexible Interconnected Distribution Network Considering SOP

The distribution network that uses flexible interconnection devices to realize the interconnection between multiple feeders is called flexible interconnection distribution network,which has typical features such as hybrid AC and DC,closed-loop power supply,controllable power flow,flexible access to distributed power sources and energy storage equipment.Smart soft switch(Soft Open Point,SOP)is a typical device for flexible interconnection of multiple feeders in a flexible interconnected distribution network.It not only has the ability to dynamically adjust the power flow,but also adjust the voltage/reactive power of each feedback line,ensuring flexible interconnection of power distribution.Controllable electrical nodes for network performance.When multiple tie switches in the distribution network are replaced by SOPs and constructed as a complex distribution network with multiple power sources closed-loop operation,it will completely break the original reconstruction technology when the distribution network fails or transfers the load.For this reason,this paper takes the flexible interconnected distribution network with SOP and traditional switchgear as the object,and carries out the research on the economic reconstruction technology of flexible interconnected distribution network.The specific research content is as follows:First,based on the analysis of SOP's topological structure,component equipment and working principle,a steady-state model of flexible interconnected distribution network with SOP is built.Secondly,the control strategy of the multi-terminal DC system is analyzed,and a unified model for solving the DC grid with multiple control strategies is built.Through the analysis of the DC grid solution unified model and the AC-DC power flow calculation method,on the basis of the steady-state model of the flexible interconnected distribution network with SOP,a flexible interconnected distribution network model based on the alternating iteration method is built,and based on this model A flexible Internet power flow calculation based on the alternating iteration method is proposed.Through the analysis and comparison of the algorithm and the model in this paper with the example of the literature,the validity and correctness of the model and the algorithm are verified,which lays the foundation for the follow-up research.Then,with network loss cost,switching cost and SOP operating cost as the objective function,the economic reconstruction model of flexible interconnected distribution network with SOP is built,and the coexistence of traditional switchgear and SOP is considered as a whole.For the proposed economic reconstruction model of flexible interconnected distribution network with SOP,this paper proposes an improved discrete binary particle swarm optimization(IDBPSO),which adopts IDBPSO and flexible interconnection The power flow calculation of the distribution network solves the model under a layered solution strategy.Finally,a three-terminal SOP is used to connect three IEEE33-node systems to a transformation case to simulate the case.Through experiments with different scenarios,it is verified that the SOP access effectively improves the economic efficiency of the distribution network operation.