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Copyright of Journal of Engineering Research (2307-1877) is the property of Kuwait University, Academic Publication Council and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Small-signal and transient stability of a power system can be improved by installing power system stabilizers (PSSs) inside the excitation controls of the generators. Nonetheless, designing and tuning the PSSs' parameters to suit all operating conditions is a complex and difficult task. Therefore, a new control scheme integrating the principles of the energy function and the functional sensitivity is proposed in this paper. The performance of this control scheme in terms of critical clearing time, simulated dynamic responses, and power oscillation damping was examined using the IEEJ West 10-machine test system. Test results reveal that the proposed scheme can improve both small-signal and transient stability performances under various operating conditions and contingencies. [ABSTRACT FROM AUTHOR]

An alternative method to find the line fault distance in a transmission network employing only one-terminal measured data is presented. The proposed method applies Z bus for short-circuit calculation to find the fault location on a transmission line without the necessity to know the fault type a priori. The well-known drawback of the standard simple-reactance one-terminal algorithm, which neglects the effect of fault impedance, will be minimized by estimating the voltage drop at the fault location by employing the Z bus technique. Accuracy the proposed method is demonstrated using the short-circuit simulation of the modified IEEE-14 bus test system on MATLAB/Simulink and the Simpower Toolbox. Compared to the accuracy obtained from the standard one-terminal algorithm, test results confirm substantially improved accuracy of the proposed method in all cases of the four types of fault categories: single line-to-ground fault; double line-to-ground fault; line-to-line fault; and balance three-phase fault. While the accuracy has been significantly improved, especially for the case with a relatively high fault impedance, also the simplicity in the involved computation is well preserved when compared to other iterative-based techniques. © 2012 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. [ABSTRACT FROM AUTHOR]