Study and Development of Anti-Islanding Control for Synchronous Machine-Based Distributed Generators: November 2001--March 2004

Performance analysis of Q-f droop anti-islanding protection in the presence of mixed types of DG

“…One option is to equip the SG based DG units with an active AIP as discussed in [4]. Especially the reactive power positive feedback AIP scheme can be effective for SG provided that the excitation system can execute the desired reactive power references rapidly enough.…”

“…Many active methods, which are based on destabilizing islanded circuits by deliberate injection of small perturbations, can also be configured to detect islanding even in a perfectly balanced islanded circuit [2], [3]. Active methods are typically applied to inverter based DG units although some active methods have also been developed for directly coupled synchronous generator (SG) based DG [4], [5]. The behavior of an islanded circuit sustained by only inverters is significantly different in comparison with the behavior of an islanded circuit sustained by SG only.…”

Facility Microgrids

“…Figure 4 shows the anti-islanding controls for synchronous machine-based DG. Two schemes can be implemented for machine-based DG [4]: an active power scheme, programmed as part of the governor control, and a reactive power scheme, programmed as part of the excitation control. These schemes were proposed by General Electric in an earlier report [4].…”

“…Two schemes can be implemented for machine-based DG [4]: an active power scheme, programmed as part of the governor control, and a reactive power scheme, programmed as part of the excitation control. These schemes were proposed by General Electric in an earlier report [4]. Two machine-based DG units were used to illustrate the effect of multiple-machine DG in parallel operation.…”