Static Stability Analysis of Ship Power System with S-CO2 Brayton Cycle Power Generation System Integrated

The supercritical carbon dioxide (S-CO2) Brayton cycle power generation system is a promising configuration to realize waste heat recovery for exhaust gas coming from marine diesel engines. However, the three-phase 1-kHz alternating current (AC) generated by permanent magnet synchronous generator (PMSG) in S-CO2 power generation system (SPGS) cannot be directly fed into the ship power system (SPS) whose rate frequency is usually set at 50 or 60 Hz. To feed the three-phase AC into the power grid of the ship, power electronic converters are required. In this scenario, the integration of SPGS into the SPS will have a significant impact on the static stability of the system. In this paper, a simulation model of the SPS integrated with SPGS is established based on ETAP software. The Newton-Raphson method is used to analyze the static stability of the system, focusing on system power flow analysis and short-circuit current calculation. To further investigate the influence of SPGS penetration on the static stability of the SPS, the power loss and voltage distortion degree are considered when SPGS is connected to the system with different grid-connected nodes and grid-connected power.