Improvement of Voltage Profiles in Mashhad Distribution Systemwith Presence of Rooftop PV

Fluctuations in the output power of Photovoltaic (PV) systems at high penetration levels in distribution system lead to problems such as voltage imbalance, overheating, and reverse power dissipation. In this paper, the voltage profile level for a part of the Mashhad's residential distribution system has been simulated. First, real energy consumption data in the residential sector with a time step of one hour is calculated. In order to investigate the impact of different penetrations of different solar systems, generating power of single-phase PV panels with capacities of 6 and 10 kVA was extracted. To improve the voltage profile, adjusting the power factor of solar inverters and automatic control of transformer tap changers have been used. According to the obtained results, by applying the mentioned control methods, not only can the voltage profile be reduced by more than 7%, but also its stability can be better by reducing the network imbalance.