Effect of excitation systems and of power system stabilisers on synchronous generator damping and synchronising torques

On-Line Estimation of Synchronizing and Damping Torque Coefficients Using an Artificial Neural Network Based Approach

“…x(t) Eee~,t]Ut'V/xo I Various methods have been proposed to break the electromagnetic torque variations to synchronizing and dampingtorquecomponents [6][7][8][9][10][11][12][13][14][15][16][17]. The damping torque component is found to be reIated to the real part a, and the synchronizing torque componenl is related to the imaginary part j (U,.…”

“…Several off-line methods have been devised to compute K, and K a [7][8][9][10][11][12]. These methods are based on the linearizedequations and the block diagram of the machine, and are calculated in the frequency domain.…”

Synchronizing and Damping Torques of Saturated Dual-Excited Alternators

“…Calculation of the transformer voltage term necessitates the derivation of dynamic saturated reactances to avoid the errordoneby previous authors whoused which is corrected by using a dynamic saturated matrix; [x"], in place of [x'] such that; (9) Taking the previous points into account, the direct axis saturation factors for the main and leakage staticsaturated reactances are formulated as follows [19]; R,,.…”

“…Synchronizing and damping torque coefficients have been used as indices for the dynamic stability ofalternators since 1927, [6][7][8][9][10]. Many attempts havebeen done to improve both the method of calculation of these coefficients [6][7][8][9][10] and the model representing the machine (11)(12)(13).…”

“…Many attempts havebeen done to improve both the method of calculation of these coefficients [6][7][8][9][10] and the model representing the machine (11)(12)(13). Previous authors [14][15][16] have adopted the conventional equivalent circuit to model the dual excited alternator.…”