Research On The Stability Of Marine Gas Turbine Power Generation System

Ship electric propulsion system realizes the perfect integration of propulsion system and power system. It becomes one of the development directions of the ship propulsion system. Marine gas turbine power generation system has the advantage of high power, light weight, low vibration. It is suitable as power source of ship electric propulsion system. Many countries attach importance to the electric propulsion system with gas turbine as prime mover. The load of ship electric propulsion system is very different than before. Sudden load and propeller load rejection cause some inevitable failures of power quality. According to the status, the thesis does research on the stability of gas turbine power generation system.In this paper, author takes a certain type of ship electric propulsion system as the research object, analysis the characteristics of it. Flywheel energy storage is applied to improve the gas turbine power generation system stability, which has advantage of high energy density and mature technology. The thesis does research on the design of flywheel energy storage device, which is match the gas turbine power generation system.In this paper, simulation is used to study the characteristics of gas turbine power generation system ,also it is used to study the impact on the gas turbine power generation system of flywheel energy storage. Based on the modular modeling, the ship electric propulsion system of a certain type ship is divided into module. The nonlinear mathematical gas turbine model is established by volume inertial method. It has high accuracy. The dynamic mathematical model of generator is established in the dq0 coordinates. The flywheel energy storage, diesel engine, excitation systems, power load, propulsion motor, ship and propeller mathematical models are also established. Based on these mathematical models, simulation models are established in the Matlab/simulink software. The electric propulsion system simulation model is established by connecting these simulation models.Author has done simulation experiments on sudden load and propeller load rejection of ship integrated electric propulsion system, one is with flywheel energy storage, another one is not with. Comparing with these simulation results, we can see that the flywheel energy storage designed in this paper has improved gas turbine power generation system power quality, as well as increases the reliability of the ship grid. The conclusion can be used to provide a theoretical basis for flywheel energy storage design, which is applied in gas turbine power generation system.