In recent years, many utilities throughout the world have been moving toward the utilization of renewable energy, e.g. wind power or photovoltaic (PV) which is an alternative, clean and sustainable energy source for the electricity production. This paper focuses on the grid-connected PV systems and their influence on the system voltage stability. The detailed modeling of the PV systems is presented. The impact of fault ride through characteristics of various penetration levels of PV generation on the system voltage stability is examined through numerical simulations conducted on the modified IEEJ West 10-machine test system. Several of interesting aspects are presented and discussed.