  Modern network-constrained unit commitment (NCUC) bears a heavy computational
burden due to the ever-growing model scale. This situation becomes more
challenging when detailed operational characteristics, complicated constraints,
and multiple objectives are considered. We propose a novel simplification
method to determine the flexible temporal resolution for acceleration and
near-optimal solutions. The flexible temporal resolution is determined by
analyzing the impact on generators in each adaptive time period with awareness
of congestion effects. Additionally, multiple improvements are employed on the
existing NCUC model compatible with flexible temporal resolution to reduce the
number of integer variables while preserving the original features. A case
study using the IEEE 118-bus and the Polish 2736-bus systems verifies that the
proposed method achieves substantial acceleration with low cost variation and
high accuracy.
