Impacts of Distributed Generation on Power System Stability

The concept of supplying increased power demand at a load centre by a local distributed generation (DG) source has recently attracted much attention in power system research. The impact of DG source penetration on power system transient stability was the main issue studied by several researchers. In this present paper, the impacts of synchronous generator interfaced DGs employing micro turbine (MT) and diesel turbine (DT) on power system stability is investigated through the analysis of critical damping ratio obtained from state-space power system model. Further, Analysis of variance (ANOVA) test was used to determine the significance of DG source penetration levels and their interaction effects on system stability. ANOVA results indicated significant interaction effects between the two DG sources on the system stability.