Study Of Load Zoning And Classification Methods For Integrated Cruise Ship Grids

At present,cruise ships,as large luxury ships,undertake the task of meeting the safety and comfort of passengers.The cruise ship integrated power grid as a source of electrical energy supply and energy for cruise ships,the stability,safety and reliability of the cruise ship integrated power grid must be guaranteed.The cruise ship power grid has a wide range of loads,which makes it difficult to manage the cruise ship power grid in a uniform manner.In order to solve these problems,the specific research of this thesis includes the following parts:1.Firstly,the cruise ship integrated power grid is taken as the research object,its load characteristics and topology are analysed and the basic parameters of the ship power system are set.Secondly,by analysing the topology of typical ship power systems,the ribbon network topology is selected as the topology of the cruise ship integrated power grid according to the requirements of the cruise ship integrated power grid in terms of power supply reliability.Then,to address the low efficiency of traditional topology identification methods after the topology of the cruise ship integrated power grid has changed,this thesis proposes a MASbased topology identification method for the cruise ship integrated power grid,which numbers each node Agent and stores this information in the blackboard model in the common area through the adjacency matrix method,and transmits the new information to the blackboard model through communication requests when the node state changes model.After receiving the change message from the Node Agent,the Coordination Agent uses the connection information of each node in the blackboard to update the adjacency matrix in response to changes in the system topology,which is used to speed up topology identification.2.To address the problem that the cruise ship integrated grid has a wide variety of loads and is difficult to manage in a unified manner,this thesis,based on the knowledge of graph theory,represents the topological node graph of a luxury cruise ship with 47 nodes using the form of a weighted undirected graph,obtains a weighted adjacency matrix based on the connections between the 47 nodes,and constructs a weight matrix based on the data samples,and from the weight matrix constructs a similarity matrix based on the DP-SC algorithm for the cruise ship integrated grid The similarity matrix required for the load partitioning,and finally the DP-SC algorithm is used to partition the load of the cruise ship integrated grid.The simulation shows that when the topology of the cruise ship grid is changed,the partitioning results will also be changed.In this case,if node 16 and node 31 are disconnected,the partitioning results will change significantly and the number of load partitions in the cruise ship integrated grid will change from 5 to 6.3.In order to improve the reliability and stability of the power supply of the integrated cruise ship power grid,this thesis,based on the load zoning of the integrated cruise ship power grid,takes the clustering centres in the load zoning results of the integrated cruise ship power grid as the dominant nodes of each zoning,uses the dominant nodes in these regions as monitoring points for voltage monitoring of the cruise ship power grid,and by setting the voltage threshold,uses the distributed and intelligent characteristics of MAS to The monitoring points are monitored for voltage,and when the node voltage at a monitoring point is monitored to exceed the set threshold,the generators in the region are then controlled by the Execution Agent for voltage regulation to bring them back to normal voltage levels.If the voltage at the node after regulation still cannot be restored to the normal range,then it is necessary to co-ordinate the corresponding generators in the neighbouring areas through the Co-ordination Agent to achieve joint voltage regulation.When the node voltage of the monitoring point in the area of the cruise ship network is subject to a large disturbance,the node voltage of the monitoring point is substantially over the limit,and the corresponding load cutting operation can also be used to intelligently remove some minor loads through the collaboration between the intelligences,so that the node voltage of the abnormal monitoring point can reach a normal value.The simulation shows that the node voltage of the abnormal monitoring point with the participation of the coordinating agent is more likely to be in the normal range compared with that without the participation of the coordinating agent.4.In order to make the node voltage of the monitoring point where the abnormality occurs reach a normal value through load cutting operation,this thesfinally studies the load priority of the integrated cruise ship power grid by examining five main influencing factors such as load operating power,load working probability,load power factor,load harmonic content and voltage offset size,etc.,and using these five main factors as the primary indicators,and then by Then,by classifying the loads in the cruise ship integrated grid according to their applications,the cruise ship grid loads under sailing conditions are divided into nine categories: auxiliary engines for power plants,deck machinery,mechanic machinery,cabin auxiliary machinery,refrigeration and ventilation machinery,all-round air-conditioning equipment,entertainment equipment,lighting and domestic electricity,and weak electricity equipment.These nine types of loads are used as secondary evaluation indicators,on the basis of which a hierarchy diagram is established and the subjective weights of the classes are calculated using the fuzzy hierarchy analysis method;according to the actual data obtained,the objective weights of the classes are calculated using the entropy weight method.Finally,the subjective weights and objective weights are fitted to obtain the combined weights and rank them from largest to smallest,and the results are used as the evaluation results of the priority of the cruise ship integrated grid load.