الفهرس | Only 14 pages are availabe for public view |
Abstract This thesis follows the recent trends of using the practical methods to calculate the transient stability of power systems and to obtain the type and parameters of automatic excitation regulators which secure a aatn sfact orLLy transient performance of power systems. There are always discrepancies between both the laboratory results~ the performance of actual power systems and the results of calculations. These descrepancies are mainly due to the unavoidable errors in data about the , , power systems as ’well as in the calculating procedure itself. For the above mentioned reasons~ the author has developed comparative studies for the various methods of calcu_ lating the transient stability. A pronounced interest is given to practical methods of calculations. l!;rrorestimation is carried out for the different methods of calculation. An extensive experimrntal laboratory work was carried out on a h sync’ronous machine connected to an infinite bus through a network specially designed to simulate the transrnlssion system. The author has also developed a more accurate method to calculate the transient stability of power systems. This method is based on Park’s differential equations of all the power system elements. The laboratory results and the results of calculation of this accurate method have been used as a criterion for measuring the accuracy of the different practical methods of calculation. ~’he author has proposed a universal method for calculating the transient stability of regulated power systems composing an equivalent generating station operating on an infinite system through complex transmission network. The author has thoroughly investigated the effect of tne fast acting voltage regulators~ automatic excitation forcing and automatic speed regulators on transient stability of power systems. This work necessitated the design and execution of three different programs on the (IBM 1620) electronic - computer at the National Planning Centre and the (I C 1 1905 E) computer at the Scientific Computation Centre of Cairo University. These programs enabled the author to obtain the most suitable fast acting voltage regulators and the proper tim0 of application and removal of excitation forcing in order to obtain the optimum performance of power systems under abnormal operating conuitions. After comparing the different methods of approach for studying the transient stability of the unregulated power syst ems , the investigations were extended to power systems equipped with both automatic speed and voltage regulators. |