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RoCoF Constrained Unit Commitment Considering Spatial Difference in Frequency Dynamics
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DOI：10.1109/TPWRS.2023.3240776.png)
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Abstract
En 中文
The post-disturbance rate of change of frequency (RoCoF) is a critical index for low-inertia power system frequency stability. This paper proposes a RoCoF constrained unit commitment model so as to enhance the frequency stability in operation time-scale, where the spatial difference in frequency dynamics is considered and the RoCoF constraint is enforced for each node. The maximum of node RoCoF is approximated by two terms, i.e., the initial post-disturbance node RoCoF and the maximum of the center of inertia (COI) RoCoF. Analytical expressions of the node initial RoCoF under typical disturbances are derived. Then, a tractable relationship between the node initial RoCoF and the working status of generators is obtained by the piecewise linearization approach. Simulation results carried out on the IEEE 39-bus system demonstrate the proposed model can limit the node RoCoF in an economic and accurate manner. The adaptability to renewable power generation and online application are also discussed.
Keywords:
Generators
Power system dynamics
Power system stability
Wind turbines
Switches
Time-frequency analysis
Numerical models
Frequency dynamics
inertia
RoCoF
frequency spatial difference
unit commitment
Journal
IF:
7.2
Papers:
1.1W
Citations:
5.0W