With increasing renewable energy integration, power
systems face security threats such as amplified frequency fluctuations,
insufficient inertia, and diminished frequency regulation capability. These
challenges increase operational risks and threaten grid stability. Existing
frequency constrained optimization methods often struggle to balance
flexibility and real-time capability. This paper introduces a multi-dimensional
frequency security region construction method based on common-dimensional
metrics, defining its boundary by integrating these metrics with weighted
coefficients. A model predictive control strategy is applied to the
hierarchical optimization framework. By dynamically adjusting generator outputs
while accounting for renewable energy uncertainty and multi-dimensional
frequency security region constraints, the method achieves real-time feedback
and iterative refinement across hierarchical layers, enabling rapid frequency
security control. Case studies on IEEE 39 and IEEE 14 systems demonstrate that
this model predictive control is based on hierarchical optimization
significantly improves frequency stability under high wind power penetration.
Results confirm enhanced computational efficiency while ensuring reliable and
secure grid operation.
PAN Dounan1, LI Canbing2
. Hierarchical
Optimization Method for Unit Commitment Under Multi-Dimensional Frequency
Security Region Constraints[J]. Journal of Shanghai Jiaotong University, 0
: 1
.
DOI: 10.16183/j.cnki.jsjtu.2025.374