Wind power plant model collection network representation in an aggregated wind power plant model

Wind power plants may need to be modeled as aggregated models for power system studies. The modeling is typically done by scaling up the wind power plant components, and representing the wind power plant collection network either by equivalent or zero impedance. The collection network representation in aggregated wind power plant model may have influence on the precision of wind power plant internal power losses and reactive power capability, especially in the vicinity of reactive power capability requirement limits. This paper analyses the aggregate model collection network representation in the case of different wind power plant topologies and wind power plant operating states. The study shows that the equivalent collection network impedance in aggregate model provides very accurate results for reactive power in the case of identical operation of the wind turbines in the wind power plant. The error of reactive power in aggregate model representation in the case of un-identical operation of wind turbines is analyzed.