Abstract
The determination of the transient stability of an electric power system is a crucial step in power system analysis. This paper investigates the transient stability of an IEEE-9 bus system consisting of three generators and nine buses. At first, a load flow analysis is conducted in order to determine the pre-fault conditions. Secondly, fault analysis is performed to analyze post fault conditions like the fast fault clearing time and load switching in order to determine the system stability. For transient stability analysis, Euler and Runga methods are compared and applied on the frequency and rotor angle of the system to analyze the system variations under different fault conditions. The simulations were done on the Power World Simulator (PWS) software. It is concluded that Critical Fault Clearing Time (CFCT) is a very important factor in keeping the power system within the stability bounds. A slight increase in Clearing Time (CT) from the critical value causes un-synchronism.
Highlights
A power system is designed to supply continuous power with good quality by maintaining voltage stability even in the presence of lightning, short-circuit, or ground faults [1]
Simulation is performed with respect to blackouts in which, a system can no longer supply load [37] and two cases of fault clearness before Critical Clearing Time (CCT)
In order to analyze the power system behavior, different types of fault have been simulated on the IEEE-9 bus system for transient stability analysis
Summary
A power system is designed to supply continuous power with good quality by maintaining voltage stability even in the presence of lightning, short-circuit, or ground faults [1] Due to these faults, one or many generators may act abnormally causing a wide gap between demand and supply [2, 3]. The power system instabilities can be faults such as transmission line short circuits, losses of generator, and losses of load [10] They all result in a large deviation of the generator rotor angle and effect power flow, bus voltage, and other system variables causing a partial or total loss of the transmission network [11]. The considerations that are taken to counter system instability include the physical behavior of the instability, loss of synchronization, low bus voltages, high frequency deviation, size of the disturbance, and the measures taken to improve power system stability [14]
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