Frequency And Transient Stability Analysis of A 7-Bus Bar System Using PSAF

Abstract

This study provides an investigation of voltage, frequency, and transient stability in a 7-busbar system utilising the Power System Investigation Toolbox CYME PSAF. The Newton-Raphson method is acknowledged for fast computational applications. The analysis is conducted in scenarios involving both normal and faulty circumstances. Under typical operating conditions, it has been observed that the system exhibits stability, with the voltage and frequency values remaining within acceptable thresholds. Nevertheless, it has been shown that the system exhibits instability in some fault scenarios and when certain fault clearance durations are applied. The examination of transient stability is conducted via the Equal Area Criterion (EAC). The Equivalent Area Criterion (EAC) is a straightforward and efficient technique used to assess the transient stability of a power system. The analytical results indicate that the 7-busbar system exhibits susceptibility to transient instability when subjected to three-phase faults on the transmission lines that interconnect buses 1 and 2, as well as buses 3 and 4. The system exhibits susceptibility to transitory instability in the event of single- phase-to-ground faults transpiring on bus 7. The analysis further demonstrates that the transient stability of the system can be enhanced through a reduction in fault clearance time. Nevertheless, there exists a trade-off between the duration required to clear faults and the associated expenses. The findings of this study can be applied to the design and operation of the 7-busbar system in a manner that prioritises safety and reliability.