Photovoltaic Power Station Modeling and Its Impact on Distribution Networks

The integration of Distributed Generation (DG) can affect the distribution network in many aspects, such as power flow, short-circuit current, distribution grid protection, etc. In this paper the influence of a MW photovoltaic (PV) station to a distribution network is mainly studied. The mathematical model and equivalent circuit of a photovoltaic cell are presented in the first part of this paper. Then a 1.6MW PV station model is established in the software of DIgSILENT PowerFactory. This model is not a precise one, but it is more convenient for the research of PV station’s affection to a power grid. In the last part of this paper, various simulations are performed to investigate the influence of the PV station to a distribution network. The result shows that the model is capable for our investigation and the influence varies with different operating modes of the PV station.