The VDE directive AR-N 4105 has been implemented as a first step in order to obligate renewable energies to participate in voltage stabilization. Thereby this commitment only asks for the compensation of the self-induced voltage fluctuation. Especially due to the introduction of Smart Grids the restraints for the implementation of further functions and tasks for dispersed energy generation units are being reduced. Furthermore the implementation of these functions are gaining importance due to the shift from conventional power plants to dispersed energy generation units. This thesis shows that a relatively small number of PV generators can have a noteworthy impact on the voltage stabilization, the network losses and the reactive power balance of a mean voltage network. Therefor the boundaries of influence are analyzed using network calculations and extreme scenarios. Then alternative feed-in profiles for reactive power are developed and evaluated with network calculation in order to determine the potential of decentralized reactive power provision. Finally the activation of this potential can be become a useful part in the “Energiewende”, that has been declared as a “century project” by the German Federal Government.