Photovoltaic energy impact on grid's distribution line voltage for different load levels

Distributed energy integration into the grid is increasing. This is due to its benefits such as environmental and economic compared to conventional systems. Use of renewable energy resource offers several advantages for both final consumer and utility grid. However, this may have an undesirable impact if it's not suited to grid's specifications. Several problems arise especially those related to line voltage stability. This paper studies the impact of photovoltaic energy on voltage distribution line. The grid's part including district zone modeling and power flow simulation was done. Different scenarios for several renewable power levels are considered under various load states. The simulation results showed voltage drop in long feeder end in absence of distributed generator. Photovoltaic power injection will treat this problem and will reduce line losses but may be accompanied by over voltage risk on distribution line due to reverse power flow.