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Artificial Intelligence for Renewable Energy Systems


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real part of eigenvalue was increased by 46.2% and 49% for both three- and six-phase generator, as shown in Figures 1.17a and 1.18b, respectively. A major effect was found on real eigenvalue II which was decreased by 112% and 82.2% for three-phase and six-phase generator as shown in Figures 1.17c and 1.18d, respectively. In three-phase generator, no change was noted in eigenvalue I and III as shown in Figures 1.17b and d, respectively. But in case of six-phase generator, slight variation was found in real eigenvalue I and III, as shown in Figures 1.18c and e, respectively. During the analysis, it was noted that the effect of variation in the value of reactance xlKq was only found in real eigenvalue II, with no variation on other eigenvalues, hence not shown. Value of real eigenvalue II was increased by 45.7% and 48.2% for three- and six-phase generator as shown in Figures 1.19a and b, respectively.

Graph depicts the variation in eigenvalue of six-phase synchronous machine with damper resistance change along q-axis (a) stator eigenvalue I and II, (b) rotor eigenvalue, (c) real eigenvalue I, (d) real eigenvalue II, (e) real eigenvalue III.

      1.5.5 Magnetizing Reactance Variation Along q-axis

Graph depicts the variation in eigenvalue II with damper leakage reactance change along q-axis in (a) three-phase and (b) six-phase generator. Graph depicts the variation in eigenvalue of six-phase synchronous machine with magnetizing reactance change along q-axis (a) stator eigenvalue I and II, (b) rotor eigenvalue, (c) real eigenvalue I, (d) real eigenvalue II, (e) real eigenvalue III.

      Both three- and six-phase generator evaluated eigenvalues were found to unchanged with the variation in magnetizing reactance xmd along d-axis. Hence, it is not presented.

      1.5.6 Variation in Load