COMPUTER BASED ANALYSIS OF ELECTRICAL POWER SYSTEM FOR THE PURPOSE OF STABILITY STUDIES
ABSTRACT
This report is on stability study in electrical power system. The ability of an electric power system to reestablish the initial state (or one practically identical) after any disturbance manifested as a deviation from the initial parameter values for the system’s operation. The electric power sources in a power system are usually synchronous generators, which are coupled together by a common electric network in such a way that the rotors of all generators are in synchronized rotation. This mode, called the normal, or steady-state, mode, should be stable; that is, the power system must return to the initial state (or one practically identical) every time after a deviation from the steady-state mode.
CHAPTER ONE
INTRODUCTION
1.1 BACKGROUND OF STUDY
Electric power system analysis software ran on mainframe computers in the early years after the introduction of digital computers.
Although there are many software applications in the market today that performs the analysis of electric power system on PCs, most are intended for professionals. These programs take detailed input data about the system, use fast algorithms to perform the solutions, and then present the result obtained. Such software is most useful when only the final results are sufficient for the user.
A problem for electric power system students is the solution of problems in textbooks. In the case of load flow problems, most of the effort is focused on iterative calculation, not on how the problem is solved. The same is true for stability studies. Professional software for analysis of electric power systems can help such students to prove their solution; however, only the validity of the final result can be checked.
The transient stability is a fast phenomenon and usually occurring within 1sec for a generation close to the cause of disturbance. The time domain simulation method is the most commonly used method to solve the set of non linear equations describing the system dynamic equation, in order to determine the transient stability. From the inspection of the solution, conclusion can be drawn whether the system is stable or unstable.
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