1. DYNAMIC PERFORMANCE OF INVERTER INTERFACED DISPERSED GENERATION
Dynamic simulations of MV systems under perturbed and faulted conditions
Grid connected operation: active/reactive power controller
Island operation: voltage/frequency controller

2. Comparison between static and rotating units
3-phase fault event
0.1
0.2
0.3
0.4
0.5 1 2 3 4
t [s]
Current [p.u]
Rotating unit
Static unit
Voltage sag event
0.5 1
1.5 2
2.5 3
t [s]
Current [p.u]
Rotating unit
Static unit

3. Grid connected operation
Negligible contribution to fault currents
Reduced stability and electromechanical problems
No need to modify existing protection schemes
Island operation
At least one DG unit must perform V-f regulation
Fast load tracking requires suitable energy storage
High regulating current injection
Need to develop suitable control strategies for load sharing and information exchange between groups