Date of Award

2010

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Electrical Engineering

First Advisor

Lebby, Gary L. Dr.

Abstract

In the electrical power industry one of the most challenging tasks is to produce and provide electrical energy in a safe, reliable, efficient and economically sound manner under stressed conditions such as: (i) harmonic variation, (ii) frequency variation, (iii) voltage magnitude variation, (iv) transient overvoltages and inrush currents after a disturbance to the power system occurs. There are many disturbances that occur that provoke transients in power systems including: (i) lightning, (ii) capacitor switching events, (iii) faults, (iv) startup of motors and generators. Although they last for very short periods of time, the appearance of these transient overvolatges and inrush currents can be lethal to sensitive equipment within the power system. The objectives of this research are to: (a) develop and present a power system controller to protect power systems from electrical transients after system disturbances; (b) enhance system operation. A Power System Transient Control System (PSTC) has been designed and it is capable of preventing overvoltage signals from being distributed in the power system assuring acceptable system operation. . This study emphasizes capacitor switching and fault analysis for three phase power systems. The PSTC is an electronic device that is connected to the power system whose principle operation is based on a minimum/maximum tracking method. It performs xvi switching operations at the optimum switching point on the signal where there is minimum switching stress and is responsible for selecting the optimum switching point automatically. The Alternative Transients Program (ATP-EMTP), software used for the digital simulation of transient phenomena, is used to simulate the controlled switching needed for regulating the transient disturbances observed in this research. The control switching in ATP-EMTP is done via Transient Analysis Control System (TACS) modules.

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