Sharifzadeh - Center of Excellence for Power Systems Automation and Operation, Department of Electrical Engineering Iran University of Science and Technology Tehran, Iran
Jalilian - Center of Excellence for Power Systems Automation and Operation, Department of Electrical Engineering Iran University of Science and Technology Tehran, Iran

A Distributed Generation (DG) unit can be operated either in grid-connected mode or in autonomous mode and has to possess the essential dynamic stability in both cases. This paper presents a systematic approach to small-signal modeling of an inverter based DG unit in grid-connected, autonomous and transient from grid-connected to autonomous modes of operation. A first order eigenvalue sensitivity analysis is done to investigate the effect of changing different parameters on eigenvalues and system dynamics both in the low and high frequency ranges. Simulation results show an acceptable agreement with the loci of eigenvalues.

Distributed Generation, Small-Signal Dynamic, Sensitivity Analysis, Eigenvalue