Research On The Network Reconfiguration Of Hybrid AC/DC Shipboard Power System

The shipboard electric power system is the general entirety of all the equipment for production,conversion,transportation and consumption of the ship's electric energy.Power supply,power distribution equipment,power network and the load s connect in a certain way constituting the ship power system.With the development of shipboard power system,its network structure is more and more complex.When military shipboard power system is in use,the equipment failure,generators,buses or some important components malfunction or abnormal operation due to the attack or misoperation,may lead to important load power loss,which will affect the combat and navigation safety of ships.Therefore,the network reconfiguration must be carried out during the failure of the ship to ensure power supply for the important load s.This thesis firstly introduces the research background and significance of the network reconfiguration of the shipboard power system.It also analyzes the current research situation at home and abroad and collates the existing models and algorithms for the reconfiguration of the power system network.After that,it combs the general situation of the development of the integrated ship power system and lists the classification and characteristics of the system load.The topological structure of the ship's integrated power system is presented.Then the mathematical model and optimization method of the reconfiguration of the ship power system are analyzed in combination with the reconfiguration characteristics of the ship power system.The research findings obtained by the experts and scholars at home and abroad are summarized and the limitations of the research methods are summarized.In view of the important and difficult points of this thesis,the research strategy is proposed.Then,as for the DC zonal electrical distribution system(ZEDS),all the loads are classified into three classes according to their service importances.In order to maximize the recovery of load power supply and minimize the number of switching operations as much as possible at the same time,the weight coefficients of each sub-objective are determined and the theunification multi-objective is achieved by the analytic hierarchy process(AHP),then proposes a method of multi-objective mixed integer nonlinear optimization method for reconfiguration.The proposed method is applied to two fault cases.The general network modeling system(G AMS)is used to solve the network reconfiguration and avoid the choice of optimization algorithm.The results of the case study verify the feasibility and effectiveness of the proposed method.Finally,based on the optimized objective function proposed ab ove,the network reconfiguration of the hybrid AC/DC zonal electrical distribution system of shipboard power system is also analyzed.As for the constraints,since the system containing part of the AC line and load,the power flow constraint is added.In o rder to reduce the optimization calculation and shorten the calculation time,a new method of network reconfiguration based on the linear power flow formulation model is creatively proposed.The method is applied to the example of three cases.The optimal solution results gained by GAMS software show that the method proposed can guarantee the power supply of all important loads.Compared with the optimization results of the similar case in other papers,reconfiguration results in this thesis show that the m ethod proposed can effectively reduce the optimization time and improve its efficiency.