SENSITIVITY OF TORSIONAL STRESS PREDICTIONS OF DIESEL GENERATOR SETS TO CRITICAL PARAMETER VALUES

In the present paper a new method is presented for the evaluation of t orsional stressing of diesel-generator sets consisting of components w ith uncertain torsional characteristics. A frequency scanning techniqu e Is implemented for eigenvalue analysis of the elastic system. Due to the uncertainty of the values of stiffness and damping coefficients, a sensitivity analysis method is also presented, suitable for the eval uation of the range of the mechanical stresses. Special consideration Is given to the correct simulation of the coupling to the electric net work, Including the Influence of generator regulators and possible net work interactions. An exact formula Is extracted for the synchronizing and damping torque coefficients. The method presented was checked in a Diesel Power Station of the autonomous electric system of a Greek is land.