SOC Estimation Of Battery Pack And Study On Driving Range For Solar Electric Sightseeing Boat

With the development of the social economic and the continuous improvement of people's living standards,many policies and measures to promote tourism investment and consumption were carried out by government,which led to the vigorous development of tourism,and aquatic traveling has been more and more popular.Solar electric sightseeing ship is made of clean solar energy,lithium battery and electric propulsion system.It not only meets the requirements of environmental protection,but also provides a comfortable feeling for passengers.As the energy source of solar electric sightseeing ship,power battery is the key part of the w ship power system.SOC(State Of Charge)is the main parameter of battery performance,which has important role in improving the utilization rate of the battery energy,prolonging the service life of the battery and increasing the navigation miles of the electric ship.As an important performance index of the electric ship,driving range has important significance for the safe and stable operation of the ship.Therefore,based on the SOC defined by energy,with the support of related topics,the estimation of SOC and the prediction of remain navigation miles based on energy conservation were researched,and the remote monitoring system for the two parameters is developed by Delphi7.The main works in this paper are as follows:1.Different definitions of battery SOC were analyzed and compared,and the advantages and disadvantages of different battery SOC estimation methods were also analyzed,combined with the characteristics of power system of the new energy ship and the analysis of the influence of SOC,the mathematical expression of SOC was improved.The structure,working principle and charging & discharging characteristics of the battery were analyzed,then,the equivalent circuit model of the battery was established,and the model parameters were identified by the recursive least square method,which laid the foundation for the estimation of SOC.2.Studying the estimation method of battery SOC.According to the established model,combined with the mathematical expression of SOC,the state space equation of the extended Kalman filtering algorithm was established,the SOC estimation simulation platform was built in Matlab/Simulink,and the accuracy of the algorithm was verified by using the constant current and variable current conditions.3.A ship energy calculation model was established by analysising the ship energy balancerelationship,the ship electric propulsion system simulation platform was built to make prediction simulation of navigation miles based on cruising mode,and combining with the ship test to verify the accuracy of the calculation model.4.Realizing the monitor and display of battery information and driving rang.A monitoring center interface based on the Delphi7 was built and the program to implementation of the SOC estimation algorithm was compiled,and the data was storage to the SQL Server 2005 database,the remote monitoring system of solar electric sightseeing ship was developed.