Abstract:
The penetration of large-scale PV systems into a traditional transmission system adds
to the global efforts to increase renewable energy sources. Stable, secure, and reliable
power system operation can be assured by performing steady-state and dynamic
analyses for the increasing penetration of large-scale PV systems. This paper aims to
analyze voltage stability by studying the steady-state and dynamic behavior of the
IEEE 24 bus test system. Load flow analysis, AC contingency analysis (ACCA), and
QV curve analysis are performed under steady-state analysis while critical fault
clearing time is determined under dynamic analysis for all the system buses under
various levels of PV penetration. ACCA reports the critical buses of the system under
severe contingencies and the reactive power required by the critical buses during
contingency is determined to keep the bus voltages under stability margin using QV
curve analysis. Transient stability analysis is performed to calculate the critical fault
clearing time by applying a three-phase fault. The maximum PV penetration capacity
is found to be 6% of the total generation. The simulations are carried out using PSS/E
and the results reveal that the increasing penetration improves the voltage stability.
