Islanding Event Detection in Grid-Connected Distributed Generation Systems Using Unscented Kalman Filter

Figure 5

(a) Results obtained in islanding conditions (for normal: blue line; for islanding: red line): PV modal voltage, residual signal, 3^rd and 5^th voltage harmonics, and THD under nonislanding and islanding conditions (parallel RLC load); (b) wind modal voltage, residual signal, 3^rd and 5^th voltage harmonics, and THD under nonislanding and islanding conditions (parallel RLC load); (c) PV modal voltage, residual signal, 3^rd and 5^th voltage harmonics, and THD under nonislanding and islanding conditions (balanced load case); (d) wind modal voltage, residual signal, 3^rd and 5^th voltage harmonics, and THD under nonislanding and islanding conditions (unbalanced load case).

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