Advanced fuel limit design to improve dynamic performance of marine three-shaft gas turbine

Abstract

Gas turbine powered integrated power system can effectively supply for shipboard weaponry, representing an obvious developing trend of world naval ship power. However, in the large pulsed power load environment, system stable operation still suffers from insufficient gas turbine power response. In order to improve the dynamic performance and transient stability of three-shaft gas turbine, in this paper, fuel limit design is focused to a novel perspective. As a basis, a high accuracy model of three-shaft gas turbine is established, the model accuracy is validated against actual test data. By decoupling and analyzing multi-inertia coupling structure of three-shaft gas turbine, a transient performance prediction method is proposed, and the advanced fuel limit design considering multiple factors such as compressor surge, turbine overtemperature and combustor lean blowout is suggested. MATLAB/Simulink simulations are carried out to present the performance of advanced fuel limit design under different operating conditions. The simulation results indicate that, in a set large pulsed power load environment, the upgraded fuel limit could increase fuel flow rate and power response by a multiple of approximately 3.1 while satisfying safe indicators, reducing the transient speed regulation from 21.7 % to 7.2 %, meeting the stability capability to adapt for load impact.