Online Coherence Identification Using Dynamic Time Warping for Controlled Islanding
For power system operators, it provides a more effective online tool for controlled islanding to prevent blackouts, though validation is limited to a small test system.
This paper proposes an online method for identifying generator coherency using PMU data and dynamic time warping, combined with spectral clustering for non-generator buses to minimize power flow disruption. Validation on the IEEE 39-bus system demonstrates advantages over existing methods.
Controlled islanding is considered to be the last countermeasure to prevent system-wide blackouts in case of cascading failures. It splits the system into self-sustained islands to maintain transient stability at the expense of possible loss of load. Generator coherence identification is critical to controlled islanding scheme as it helps identify the optimal cut-set to maintain system transient stability. This paper presents a novel approach for online generator coherency identification using phasor measurement unit (PMU) data and dynamic time warping (DTW). Results from the coherence identification are used to further cluster non-generator buses using spectral clustering with the objective of minimizing power flow disruption. The proposed approach is validated and compared to existing methods on the IEEE 39-bus system, through which its advantages are demonstrated.