A Novel Approach to the Torsional Interaction and Electrical Damping of the Synchronous Machine Part I: Theory

The torsional interaction phenomenon between the electrical and mechanical system is explained with the aid of the newly introduced complex torque coefficients ke(j¿) and km(j¿). The frequency response ke(j¿) characterizes the behaviour of the electrical system including the electrical damping with and without series capacitors, whereas km(j¿) describes the mechanical system. Multiplication of these by the phasor ¿, which denotes the generator rotor oscillation, yields the electrical and the mechanical torques, respectively.