A DIGITAL COMPUTER STUDY OF POWER SYSTEM STABILITY TECHNIQUES
Date
1970-01
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Degree Level
Doctoral
Abstract
Many power system analysis problems which were previously considered intractable due to the large number of required calculations are now being solved using medium to large sized digital computers. This thesis presents three methods for calculating power system stability. The first is a fast reduction method, the second uses an iterative approach to solve the system matrix and the third, which is believed to be a new approach to system solution, involves removal by reduction of unimportant buses and a direct solution of the remaining equations. Generator modelling (including saturation and saliency) is included in this method. Three transient stability programs were written using these three methods of system solution. A load flow program was also written. Tests were undertaken to compare and assess the relative advantages and disadvantages of each method.
The step-by-step technique was selected as the method used to solve the swing equation after comparison tests were made with the Runge-Kutta method. In another series of tests, the second and third methods were compared on their ability to handle non-linear loads. Both methods were successful but the third method was the most stable in a mathematical sense. A technique for modelling governors and exciters was discussed and tests successfully carried out to show some of their effects on system solutions.
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Degree
Doctor of Philosophy (Ph.D.)
Department
Electrical Engineering