  With the rising demand for solar energy installation, there is a pressing
need for utilities to regulate the voltages at the distribution level. In grids
with high penetration of photovoltaic (PV) systems, voltage fluctuations can
occur at the distribution systems, resulting in inverter tripping and
insufficient power to meet the load. We present a linear model for voltage rise
versus PV output power. This model can be used to study the effect of
increasing PV system capacities on distribution system voltages. It is observed
that voltage fluctuations have greater correlation with the location of the PV
systems on the grid than with the PV system capacities, i.e., more randomness
and disorder in the behavior of voltage occurs with PV systems with larger line
impedance.
