Research On Load Optimal Distribution Of Ship Power System

With the rapid development of the shipbuilding industry,the related control theory of ship power system has been gradually improved,but the traditional load control strategy still has shortcomings,and it cannot meet people’s demand for ship operation efficiency and economy.Electric load is a very important part of electric propulsion ships.In order to ensure the stable and efficient operation of electric propulsion ships,it is very important to carry out research on ship power system power load distribution.In response to the abo ve problems,this article aims to improve the efficiency of electric load operation and strengthen the stability of the ship’s microgrid.Taking ocean cruise ships as the research object,the research on the optimization of the ship’s power system power load distribution is carried out.First,design load dynamic priority,overload start query control process and power limit strategy.Combining the different operating conditions of the ship and the importance of the electrical load,the dynamic priority table of the ship’s electrical load is formulated.Aiming at the start-up problem of large-scale electric loads applying for access to the ship’s power system,a overload start-up inquiry control process is designed,so as to rationally plan the connection of loads.Aiming at the shortcomings of the traditional strategy that the load loading speed is too slow,this paper adopts fuzzy logic control to improve it.Through simulation experiment verification,it can be known that the power limit strategy designed in this paper can shorten the load loading time and reduce the generator speed and stator current fluctuation range.Second,the frequency characteristics of the ship power system are analyzed and the steady-state frequency is predicted.By analyzing the static frequency characteristics of active load,generator frequency-power characteristics,system frequency characteristics,and dynamic frequency characteristics of ship power system in ship microgrid,it can be known that both load frequency characteristics and generator frequency power characteristics will affect the system frequency recovery process,which can be used for The objective function in designing the under frequency load shedding optimization scheme provides a reference index.In addition,the steady-state frequency prediction method is applied to the solution of the subsequent frequency constraints,which facilitates the calculation of the under frequency load shedding control model.Third,under frequency load shedding optimization control scheme based on AHP and multi-agent particle swarm optimization is designed.In this paper,under frequency load shedding optimization control model is constructed,and the improved standard particle swarm algorithm combined with the AHP is used to solve the under frequency load shedding objective function,and finally the under frequency load shedding optimal control scheme is obtained.It can be seen from the simulation experiments that the optimized scheme can make the ship power system perform better in the frequency dynamic process than the traditional scheme on the premise of satisfying the steadystate frequency of the system.Finally,design the power load online distribution system.The overall system is composed of three parts:ship power system data acquisition system,ship-to-shore communication system and power load online distribution software.The online distribution software has overload query,power limit and under frequency load shedding functions.