大型远洋船舶多工况运行下并联IRGT/SOFC系统的最优功率分配策略与特性分析

Abstract To address the demand for long-endurance and high-efficiency operation of large ocean-going vessels in multi-scenario missions, this study proposes an innovative all-electric propulsion system combining parallel intercooled reheat gas turbine (IRGT) and solid oxide fuel cell (SOFC). The coordination power switching characteristics and relationships between them under typical scenarios are investigated, and optimal power allocation strategies for wider load range considering efficiency and safety are developed. Results show that the validated 68 MW vessel hybrid system achieves 50.1 % efficiency with 2.5 % maximum error at design point, demonstrating high accuracy. When the vessel under full speed scenario, the propulsion system operates at 2.11 power ratio with 50.1 % efficiency, requiring fuel larger than 0.967 kg/s to avoid turbine blade overheating. When the vessel switches to mobile cruise scenario, adjusting R1, R2 to 0.99 and 0.58 shifts to IRGT mode under 106.1 power ratio with 45.8 % efficiency, which cause wider zone from 4 to 44 MW. For non-urgent oceanic missions, vessels generally sail at economical speed to maximize cruising range. By increasing R1, R2 of unit 1 to 0.04 and 1, unit 1 switches to SOFC-dominant mode at 0.05 power ratio with 50.1 % maximum efficiency, preventing SOFC overheating. For silent scenario with power from 6 to 10 MW, regulating R1, R2 to 0 and 0.42, dual units turn to SOFC-only mode with 49.9 % maximum efficiency. The optimal strategy expands operation zone by 38.5 % to 10 %–108 % with 44.3 %–50.5 % efficiency, providing technical foundation for next-generation marine power systems with long endurance, flexible load response, and multi-scenario adaptability.