  Establishing cleaner energy generation therefore improving the sustainability
of the power system is a crucial task in this century, and one of the key
strategies being pursued is to shift the dependence on fossil fuel to renewable
technologies such as wind, solar, and nuclear. However, with the increasing
number of heterogeneous components included, the complexity of the hybrid
energy system becomes more significant. And the complex system imposes a more
stringent requirement of the contingency plan to enhance the overall system
resilience. Among different strategies to ensure a reliable system, intentional
islanding is commonly applied in practical applications for power systems and
attracts abundant interest in the literature. In this study, we propose a
hierarchical spectral clustering-based intentional islanding strategy at the
transmission level with renewable generations. To incorporate the renewable
generation that relies on the inverter technology, the frequency measurements
are considered to represent the transient response. And it has been further
used as embedded information in the clustering algorithm along with other
important electrical information from the system to enrich the modeling
capability of the proposed framework. To demonstrate the effectiveness of the
islanding strategy, the modified IEEE-9 bus and IEEE-118 bus systems coupled
with wind farms are considered as the test cases.
