Considering local photovoltaic production in planning studies for low voltage distribution grids

Abstract

This work studies the impact of local PV production on the main indicators of planning studies in the context of low voltage grids. The two criteria that are assessed are the maximal power transmitted and its equivalent yearly duration. An analytical expression is put in place, considering the impact on the aggregation of the load consumption and the production at the point of coupling of a distribution grid. Steps are identified depending on the penetration rate of the PV production system in the grid and the sign of the peak power flowing through the MV/LV substation. Simulations validate the mathematical models as well as illustrate the identified three steps as a function of theoretically expressed PV penetration rates. It is shown that better considering PV penetration rate is useful for distribution system operators, as it underline the reduction of the peak power in the grid and consequently allow a lower line cross section.