Analysis of distributed generation sources using abc synchronous machine model

Paper deals with technical aspects of distributed generation systems (DGS). Author developed model of generator, which computes with the stator variables in physical (abc) form. Importance of the model is shown on examples of transients, especially where dq asymmetry machines is present. Main technical problems connected with DGS operation are voltage and power stability. These problems are often solved with simulators based on dq-transformation (Simulink-SimPowerSystems). However, these simulators do not comprehend solution for harmonics, which can be present during transient and in specific cases could cause errors in protection functions. This paper includes three simulations with three dominant types of dispersed generation sources with abc modeled machines. At the end of paper is made a comparison of behaviour each of them during occurred transient. Simulated transients are connecting machine to grid and three phase short circuit on distribution line