Research Article
A Communication Based Islanding Detection Method for Photovoltaic Distributed Generation Systems
Table 2
A comparison of current islanding detection methods.
| Features | Local methods |
Remote methods (communication based methods) | Passive | Active | Hybrid | PLL | SCADA |
| Operation principle | Measuring the PCC parameters | Adding a disturbance signal to the grid | A combination of active and passive methods | Grid impedance change in PCC | Using receiver and transmitter sensors between DG and grid |
| NDZ | Large | Small | Small | No | No |
| Response time | Short | Shorter than passive methods | Longer than active methods | Fast | Faster |
| Detection failure | Yes, when matching powers of inverter, load, and grid | Yes, only in high quality factor | Smaller than active and passive methods | No, except a few specific conditions | No, except a few specific conditions |
| Effect on dist. grid | No | Yes | Yes, but smaller than active methods | No | No |
| System cost | Minimum cost | Average cost | High cost | Very high cost | Extremely high cost |
| Multiple inverter connection | No | Yes | Yes | No | No |
| Effect on power quality | No | Decreases the power quality of the system | Decreases the power quality of the system, but with smaller effect compared to active methods | No | No |
|
|