Table 7 Comparison between different island detection methods
Technique | Fundamental principle | NDZ | Run-on-time | False tripping % | Relevance in DG system | Operation-al cost |
|---|---|---|---|---|---|---|
Remote | Communication between main grid and DG | Zero NDZ | High | Negligible | Highly desired | Very high |
Active | Injecting disturbance and further analysing the impact on system | Small NDZ | Short | Minimal | Not-preferred | Low |
Passive | Monitoring smart grid system parameter for comparing them with pre-defined threshold value | Large NDZ | Very-short | High | Highly preferred | Low |
Hybrid | Amalgamation of passive and active islanding detection method as primary and secondary detection section respectively | Very small NDZ | Short | Minimal | Not-preferred | Low |
Signal- processing | Evaluation of received signal by signal processing tool after stabilization of operation | Minimal | Short | Minimal | Highly desired | Low |
Intelligence | Real-time data accusation system and obtain features using signal processing method | Minimal | Short | Minutest | Preferred | Low |