Renewable energy (RE) is one of the leading industry blooming around the globe. The usage of renewable energy benefits the entire nation in all ways such the social, culture and environment. Besides that, the hike in the fossil fuel price in the market increase the demand in industry for the search of renewable energy as a conventional method to generate electricity. However, installation of solar photovoltaic (PV) for electricity generation might be not a good mitigation for the problem whereby some internal issues to be rectified and to be stabilized for the better power quality to be generated. Therefore, this paper study on voltage stability analysis on power grid with integrated solar PV system. The stability of voltage has to be taken care to avoid major problem occurrence such as voltage sag. Besides, the installation of PV can produce different PV penetrating rate which indirectly affects the voltage stability. This studies on the voltage stability problems integration of photovoltaic to IEEE-14 bus networks. In this research project NVSI used to find the weak bus for injection of three phase fault for fault analysis. The faulted bus was mitigated by using the photovoltaic system.