Research On The Gas-electric Hybrid Power System Of A 7500DWT Bulk Carrier

In order to meet the green demand of inland ships under the background of carbon peak and carbon neutrality,it was urgent to optimize the energy structure of ship power system and improve the configuration of power system.In recent years,on the one hand,the use of LNG engine had been rapid developed;on the other hand,vessel electrification and intelligent technology had made continuous progress,the ship gas-electric hybrid power system had attracted extensive attention.Compared with traditional mechanical power systems,hybrid power system could switch the working mode according to different sailing requirements,rationalizing the LNG engine operating load.Therefore,ship gas-electric hybrid power system was of great significance in the diversified development of inland vessels.Based on the navigation data and design parameter of a 7500 DWT bulk carrier,a numerical model of the gas-electric hybrid power system was established,to analyze the impact of different configuration and power allocation strategies on the energy efficiency and emission of the system,and further optimize the component selection and power allocation strategy scheme of the gas-electric hybrid system of the bulk carrier.The research contents were as follows:（1）According to the design requirements of a 7500 DWT bulk carrier and the components of parallel hybrid power system,the numerical model of power system was constructed to analyze the system response characteristics under different operation modes,based on Matlab/Simulink simulation platform.The research results shew that the participation of motor can improve the dynamic response performance of hybrid power system.（2）Comprehensively considering the launching navigation cycle of the inland vessel,combined with the CO₂,NO_x and CO emission of the power system,analyze the influence law of the hybrid ratio,battery capacity and power allocation strategy on the energy efficiency and pollution emission of the hybrid power system,and compared it with the traditional mechanical power system,revealing the performance advantages of green and cleanliness of gas-electric hybrid power system.（3）Combined with the simulation results under different hybrid ratio and battery capacity configuration of the ship,taking the manufacturing cost and operation cost of the hybrid system as the evaluation index,the optimal design selection and configuration of the gas-electric hybrid system was proposed.Further combined with the system design,based on the multi-objective Particle Swarm Optimization method,the static logic gate control strategy of hybrid power system was optimized aiming at the ship operation cost and pollutant emission,and the strategy selection of the ship was comprehensively analyzed.