Analysis of the Impact of Distributed Generation on Voltage Profiles (Case Study Long Feeder 10 kV Grebak)

In order to reduce carbon-dioxide emissions, Bosnia and Herzegovina will be required to achieve the renewable energy share of 20% in total energy consumption by 2020. Therefore, in the previous period an intensive construction of power plants based on renewable energy sources has been noticed. Aim of this paper was to analyze how different distributed generators (DG) impact the voltage profiles of the system. In this paper medium voltage (MV) distribution network of feeder 10 kV Grebak, and all existing and planned DGs were modeled with real parameters. The analysis was done in PSAT toolbox (MATLAB toolbox), which was used to perform load flow calculations. Furthermore, the impact of planned DGs on voltage profiles is shown for different scenarios. The obtained results show difference between the impact of existing small hydro power plants and solar power plants, as well as the effect of their capacitive and inductive regimes of reactive power production. Also, the results showed that on this feeder it is not possible to connect planned additional DG's while maintaining voltage profiles within limits. The precise location and size of the DGs have vital influence on voltage profiles.