Improvement of the transient response of power turbine generators for energy savings in ship plants

The purpose of this paper is to present the transient response of the power turbine generator (PTG) system. A generating system has been developed that is driven by a power turbine using the exhaust gas from a diesel marine engine, this PTG system is expected to deliver energy savings. The power source should be stable in terms of both frequency and voltage for high quality. However, it is difficult to control the frequency for the PTG system by a governing, since the power turbine uses gas that must be kept constant, as well as the issue of soot. Accordingly, simulation has been employed to improve the PTG system composition and control. As a result, the overshoot shows up to 27% improvement. In subsequent verification of the simulation results conducted by observing a prototype plant, the overshoot of frequency realized the same peak. This peak value sufficiently satisfies operational requirements.