Study On The Strategy Of Hybrid Power Ship Propulsion System

In nowadays society,the total transportation volume of China’s shipping industry continues to grow rapidly every year.With the rapid economic growth,people begin to pay attention to the problem of environmental pollution.The following is the air pollution caused by the pollutant gas discharged into the air during the process of ship driving,and the noise pollution caused by the large displacement diesel power system.Due to the increasing concern of the international community for environmental protection,laws and regulations for energy conservation and emission reduction of the shipbuilding industry have been issued one after another.How to maximize the use of fuel energy has attracted people’s attention,and the development of new energy technology of hybrid power to improve the efficiency of ships is the most fundamental way to solve environmental pollution.This paper takes a small patrol ship as the research object,studies and designs the hybrid propulsion system,constructs the simulation model of hybrid propulsion system and analyzes the performance simulation of hybrid propulsion system.The main contents are as follows:(1)Based on the MATLAB / Simulink simulation platform,the mathematical model of small ship diesel electric hybrid power system is established.Using the common parallel marine diesel electric hybrid system simulation technology,the creation process of marine diesel electric hybrid system is completed,including design selection and modeling,which lays the foundation for the control design of hybrid propulsion system.(2)Analyzes the different energy requirements of small hybrid ships in different propulsion modes,and the traditional energy control strategy used in the hybrid system with diesel engine and battery.The optimal fuzzy logic energy control strategy is designed,which takes the actual navigation demand power and battery SOC as two input variables,and the reference power input signal of the front end of the converter as the output variable.The optimized fuzzy logic control strategy and traditional energy control strategy designed in this paper are embedded into the overall simulation model,and a series of simulation results are obtained.By comparing the simulation results,The effectiveness and correctness of the hybrid system under the optimized fuzzy logic control strategy are verified,and it is better than the traditional control strategy.(3)In order to better realize the conversion control between battery pack and diesel engine pack,and improve the efficiency and power quality of battery pack hybrid power system,this paper designs an improved sliding mode control strategy,and proves the stability of the improved sliding mode control method.Through the MATLAB /Simulink simulation platform,the improved sliding mode control is compared with the traditional sliding mode control.The simulation results show that the improved RBF adaptive sliding mode control strategy can well control the transformation and control of hybrid propulsion system,and adapt to the load transformation.The hybrid propulsion system can better meet the requirements of ship navigation.