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Machine Riddle No.41 - Synchronizing coefficient of synchronous machine
What is synchronizing coefficient of synchronous machine? Its equation and conditions for stable and unstable system.
Author : Manish Gautam - From: India
Thu, February 2nd, 2012 - 13:17
The concept of damping and synchronizing torques for a single-machine-infinite-bus system was first introduced in (F. P. Demello and C. Concordia, “Concepts of synchronous machine stability as affected by excitation control,” IEEE Trans. Power Apparatus and Systems, vol. PAS-88, no. 4, pp. 316 – 329, April 1969). Thus, electromechanical torque Te deviations of a machine can be expressed in terms of its speed ω and angle δ deviations, known as damping and synchronizing torque, respectively. The damping and synchronizing torques are the in time phase components proportional to the speed and angle deviations , and are defined as:

where Kd (p.u./rad/sec) and Ks (p.u.) are damping and synchronizing coefficients, respectively; and ω0 (rad/sec) is the system angular frequency. 
Author : Hamid - From: Iran
Sun, February 5th, 2012 - 17:10
Thanks Mr. Hamid for the useful information.  
Author : Manish Gautam - From: India
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