A Consideration on the Synchronizing Power of Steam Turbine Cylindrical Rotor Synchronous Generators

摘要

This paper investigates the characteristics of the synchronizing power and transient behavior of steam turbine cylindrical rotor synchronous machines. First, the eigenvalues of a steam turbine synchronous generator connected to an infinite bus are calculated and discussed. It is shown that the steady state stability and the behavior for small disturbances are represented fundamentally by three dominant eigenvalues. Next, definitions for five synchronizing powers (steady, transient, quasi-transient, quasi-subtransient and subtransient synchronizing powers) are derived and compared with an exact solution for the power obtained by using the sustained oscillation theory. It is shown that the synchronizing power, in general, takes a value between the quasi-transient synchronizing power and the quasi-subtransient one. Finally, the behavior of the synchronous machine for small disturbances are discussed. As a result, a new explanation for the behavior is presented. It is based on the quasi-transient synchronizing power and includes the transients of the field flux linkage and the quadrature axis, large time constant, damper flux linkage.