Decoupling control scheme optimization and energy analysis for a triaxial gas turbine based on the variable power offtakes/inputs

Abstract

Hybrid electric propulsion systems (HEPS) are developed to improve power system performance, however, increases the weight of power system. A novel HEPS is proposed for a triaxial gas turbine to downsize the battery and improve the power density. It has two electric machines for high- and low-pressure shafts. The electric machines supplement or extract mechanical energy. A corresponding decoupling control scheme is developed to regulate the powers of the electric machines and decouple the common operating points from the gas turbine load. A component-level model is built to optimize the decoupling control scheme and perform the energy analysis for the novel HEPS.The component match and thermodynamic cycle parameters are optimized to improve efficiency and extend lifetime for the triaxial gas turbine. The HEPS simultaneously decreases the specific fuel consumption by 10.9% and the high-pressure turbine inlet temperature (HTIT) by 13 K as the fuel mass flow keeps constant at 30% of the design value. The reduction of specific fuel consumption reaches up to 23.1% as the HTIT keeps constant at 827 K. The maximum battery power only is 6.3% of the design power of the gas turbine in the proposed HEPS. The power density of HEPS is effectively enhanced.