A naew control method for power turbine generators using an accurate ship plant system model

The purpose of this paper is to present a new control method for a power turbine generator (PTG) system using an accurate ship plant system model that ascertains startup characteristics. The PTG system is a waste heat recovery type generation system making use of exhaust gas from the main shipboard diesel engines. However, with the PTG systems, control during startup is not entirely clear. Startup characteristics from power turbine startup through synchronization to the system bus are ascertained using an accurate simulation model, and startup sequence control is clarified for a combination of gas valve operation and load bank. A prototype constructed on the basis of the simulation. As a result, in the startup process, so as to limit speed overshooting that is 0.83 p. u. at 100% output from main diesel engine as the severest condition. The synchronization to the system bus is attained, and highly satisfactory results are achieved.