| Abstract |
Due to an increasing number of distributed energy generation systems connected to low voltage grids,further investigations are required to ensure high power quality and power system stability. One importantpower system parameter is the frequency depending grid impedance at the points of connectionreferred to as grid impedance. This impedance considerably affects power quality and system stabilityespecially if remarkable resonances occur. In this paper, the grid impedance composition of differentpublic low voltage distribution systems is measured and analyzed. The primary objective is to revealthe contribution of load and solar power generation to the grid impedance and especially to resonances.This case study shows that grid impedance resonance strongly depends on loads and inductance of theupstream network in low voltage power systems. However, if the load impedance is very high or no loadis present, solar power plants lead to remarkable grid impedance resonances especially during nighttime. |
