Ali, Mir Mujahid (1993) Identification of coherent generators using linear trajectory. Masters thesis, King Fahd University of Petroleum and Minerals.
This thesis presents a method of finding the groups of coherent generators of a power system. The coherency identification criteria are developed for the most severe condition i.e. by considering the fault clearing time to be very close to the critical clearing time (CCT). The CCT is first determined using the concept of individual machine energy. Coherency of generators is checked in three periods. Coherency during the faulted period is determined by checking the relative rotor angle deviations. Coherency during the early part of the post fault period is determined by checking the slopes of the generator trajectories. Coherency during the later part of the post fault period is determined by checking the admittance distances between the generators. The reduced order model is obtained by replacing a group of coherent generators by an equivalent generator. The parameters of the reduced order model are obtained using the real power invariance principle between the original and the reduced models. The proposed method of detemining the coherent generators has been tested for various faults on two power networks. Results obtained are compared with those found by observing the swing curves generated by simulation. Finally a comparison of the CPU time required for the time domain solutions in the original and the reduced order models is given.
|Item Type:||Thesis (Masters)|
|Divisions:||College Of Engineering Sciences > Electrical Engineering Dept|
|Creators:||Ali, Mir Mujahid|
|Committee Advisor:||Haque, Mohammed Hamidul|
|Committee Members:||El-Amin, Ibrahim Mohammad and Al-Shehri, Abdallah M. and Baiyat, S. A.|
|Deposited By:||KFUPM ePrints Admin|
|Deposited On:||22 Jun 2008 16:44|
|Last Modified:||25 Apr 2011 09:12|
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