Journal
IEEE TRANSACTIONS ON POWER SYSTEMS
Volume 35, Issue 5, Pages 3470-3480Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRS.2020.2985784
Keywords
Indexes; Power system dynamics; Power system stability; Stability criteria; Generators; Load modeling; Dynamic flexibility; eigenvalue sensitivity; flexible bus; inertia distribution; power system dynamics; uncertainties
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Funding
- ReNew Power Limited
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In this paper, the concept of dynamic locational flexibility of a power system is introduced. A quantitative dynamic flexibility index is proposed, which reflects the effect of changing bus injections on the system small-signal stability. A mathematical expression of this index is analytically formulated to demonstrate the sensitivity of the critical electromechanical mode on bus active power loads. Further, a sensitivity-based approach for calculating the inertial distribution index and center of inertia (COI) location is also proposed. Flexibility and inertia are system-inherent properties and the relationship between the flexibility index and inertial distribution index is explored to identify the most flexible bus in the power system, where any change in loading level (within acceptable limits), or variation of power injected from renewable energy sources (RES) would have least effect on the small-signal stability of the system. Validation of these indices are done by simulation studies performed on IEEE 39-bus system and 68-bus system. Applicability and numerical performance of the proposed framework is also discussed for the Northern Regional Power Grid (NRPG) of the Indian power system.
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