Research On DC Bus Voltage Control Of Marine Electric Propulsion System Based On Hybrid Energy Storage

In the field of civil and military vessels,marine electric propulsion systems have broad prospects for development.The DC bus in the electric propulsion system is an important link between the power system and the propulsion system.The operation performance of the propulsion system and the power supply of the power system are affected by the stability of the DC bus voltage.Therefore,the research on the DC bus voltage stability appears.More importantly,this paper studies the DC bus voltage fluctuation control technology based on hybrid energy storage device.Firstly,the typical topological structure of electric propulsion ship is analyzed,and the mathematical model and simulation model of the main electric unit of electric propulsion ship are established,including generator module,propulsion motor module,propeller module and energy storage module.Based on the established system,the forward and reverse transformation process and the sudden pulse load process of the propulsion system were analyzed.Then,the lithium battery RC model and the supercapacitor equivalent model were established.The parameters were designed appropriately,and the characteristics of the lithium battery and supercapacitor were simulated and analyzed while the simulation model was established.The topology of the hybrid energy system and the coordinated control strategy based on supercapacitor SOC are designed and designed.The energy management process of the hybrid energy storage system is designed.The hybrid energy storage system designed to control the DC bus voltage stability.According to the simulated waveforms under typical working conditions,the energy storage capacity of each part of the hybrid energy storage system is preliminarily calculated.Aiming at the forward and reverse conversion conditions of the propulsion motor and the sudden pulse load conditions,the DC bus fluctuations of the power inlet system are analyzed.Finally,the chaotic improved particle swarm optimization algorithm is applied to the system,and an optimization method is proposed.The target completes the optimal configuration of the energy storage system capacity.The constraints of the energy storage system are determined.The total amount of energy storage components is taken as the objective function,and the parallel and series array structure of the lithium battery and the super capacitor are optimized.Simulation verification was carried out in the simulation software.