Usage of distributed generation systems is increasing. One advantage of using distributed generation systems is the stability of distribution network voltage. One distributed generation resource is the photovoltaic system which is used along with an energy storage component and incident angle tracer in order to be able to inject a monotonic flow of power into the network. In this study, the photovoltaic system was used without the above-mentioned equipment to evaluate the effect of this system on network voltage. A sample 33-bus network was introduced and the photovoltaic system was used on bus 18. The results have shown that if the radiation angle tracer was not used, then the voltage of the bus on which the photovoltaic system was installed reached 0.986 by midday. Before sunrise and after sunset, when there were no sun rays, this bus voltage reached 0.948 indicating 4% change in the bus voltage.