Steady-State and Dynamic Analyses of Large-Scale PV Penetration on Transmission System /

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.