Publication: Power system stability analysis using matlab
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Date
2012-06-01
Authors
Ch'ng, Zi Fen
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Abstract
Stability consideration plays an important part of power system planning today. Stability problems are broadly defined according to different operating conditions. However, frequent considered stability problems are transient stability. Transient stability, the main focus of this thesis, involves sudden and major disturbances, such as occurrence of fault, line switching operation or sudden load changes. The objective of transient stability study is to determine whether or not the system can withstand transient conditions subjected to large disturbance. Hence, three methods namely step by step method, modified Euler’s method and equal area criterion method are used to
analyze the power system transient stability in this thesis. MATLAB programs are developed in order to conduct case studies in transient stability for one machine connected to infinite bus system by using these three methods. These programs are useful especially in determining the critical clearing time for circuit breaker, critical clearing angle, new operating angle, maximum angle swing of rotor as well as the maximum electrical power transferred. Besides, the swing curve, in other words, solution of rotor angle with respect to time and power angle curves are displayed. This analysis enables power system engineers to design the operating times of the relay and
circuit breaker in order to ensure the reliability of the power system.