PASSIVE Anti-Islanding
Methods
Passive Anti-Islanding Methods monitors the variation in system
parameters such as frequency, voltage and current on the DG side at the
Point of Common Coupling (PCC). In case of islanding, these parameters
display variations which have been used to detect islanding. The
methodology of choosing the limits of variation of these methods mainly
depend on the IEEE standard 1547 [18] which is shown in table 1.
\begin{equation}
{P=\ P}_{\text{DG}}-\ P_{\text{LOAD}}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (3)\nonumber \\
\end{equation}\({\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ Q=Q}_{\text{DG}}-\ Q_{\text{LOAD}}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (4)\)
Figure 5 presents a single line diagram of a grid-connected DG source.
The real power (ΔP) and reactive power (ΔQ) delivered are represented by
Eqs (3 and 4) respectively.
\(P_{\text{DG}}\ \)and \(Q_{\text{DG}}\ \)are the real and reactive
power delivered by the DG source respectively. Similarly, Pload and
Qload are the real and reactive power absorbed by the load.
Table 1 of IEEE 1547 standard for IDM