Diesel-electric Hybrid Propulsion System Optimization Design For Fish Resource Research Vessel

With the development and increasingly maturity of power electronic technology,frequency conversion technology,propeller technology,the ship electric propulsion technology has a breakthrough in energy saving and environmental protection,mobility,reliability,and propulsion efficiency.The ship electric propulsion technology has been widely used in marine area.Consider fish research vessels are characterized by small size,over manning,high demand for endurance capacity.Therefore the propulsion system equipped for the vessel should be different from that of other regular ships.To choose a proper propulsion system for the vessel,extra attention should be paid to vessel's working condition and safety performance.Based on an analysis of the existing propulsion systems,this scientific and practical study is aiming at optimizing the propulsion system of the vessel with an application of the diesel-electric hybrid propulsion system.To fulfill the task of oceanographic investigation,many researches on propulsion system are done as follows:(1)In the first part,two typical kinds of propulsion systems are analyzed with an introduction of their propelling theory,system model and propelling features.It is found that both the controllable pitch propeller propulsion system and electric system have their advantages and disadvantages.This part is the theoretical foundation of designing optimum propulsion system for regional class research vessel.(2)Analysis the characteristics of the motor and propeller for the two typical propulsion system,and according the vessel's working condition,find the propeller's characteristics should fit the diesel propulsion system.(3)With the above theoretical analysis,diesel-electric hybrid propulsion system is designed for the fish research vessels,and confirmed the data for the main equipment.(4)Control principle and strategy of Parallel operation,which is vital to diesel-electric hybrid propulsion system are hereby examined.Control mode and control flow of integrated diesel-electric are then proposed.