global-journal-of-research-in-engineering-f-electrical-electronic Global Journal of Research in Engineering - F: Electrical & Electronic 0975-5861 2249-4596 Global Journals Publishing Group Incorporated 115799 Effects of Generators Under-excited Operation on Power System Low-Frequency Oscillation XuQian CHINA, Nanjing Normal University 15 01 2017 17 F6

In this paper, the wavelet method is applied to identify the time-varying frequency and damping ratio based on the PMU recorded data during Pingwei generator’s under-excited operation. The relation of oscillation frequency and damping ratio with the variation of reactive power is then attained. Furtherly, the damping torque is used to analyze the reason for easily oscillation during generator’s leading phase operation with an OMIB system. The effects of tie-line’s reactive power on inter-area oscillation damping have also been studied and results of the 4-machine 2-area system are used to verify the conclusions.

 the degree of generator’s under-excited operation; low-frequency oscillation; wavelet transform; frequency; damping ratio. Full Text

In this paper, the wavelet method is applied to identify the time-varying frequency and damping ratio based on the PMU recorded data during Pingwei generator’s under-excited operation. The relation of oscillation frequency and damping ratio with the variation of reactive power is then attained. Furtherly, the damping torque is used to analyze the reason for easily oscillation during generator’s leading phase operation with an OMIB system. The effects of tie-line’s reactive power on inter-area oscillation damping have also been studied and results of the 4-machine 2-area system are used to verify the conclusions.