Yuqing Lin, Tianhao Wen, Lei Chen, et al. Estimating Transient Stability Regions of Large-Scale Power Systems Part II: Reduced-Order Stability Region with Computational Efficiency[J]. CSEE Journal of Power and Energy Systems, 2025, 11(1): 38-50.
DOI:
Yuqing Lin, Tianhao Wen, Lei Chen, et al. Estimating Transient Stability Regions of Large-Scale Power Systems Part II: Reduced-Order Stability Region with Computational Efficiency[J]. CSEE Journal of Power and Energy Systems, 2025, 11(1): 38-50. DOI: 10.17775/CSEEJPES.2024.01180.
Estimating Transient Stability Regions of Large-Scale Power Systems Part II: Reduced-Order Stability Region with Computational Efficiency
Part II of this paper presents a reduced-order stability region (ROSR) based method to estimate the full-order stability region (FOSR) of a large-scale power system. First
we introduce the definitions of FOSR and ROSR
followed by a comprehensive theory that reveals the relationships between them. Since the full-order system can be rewritten as a standard two timescale model and the reduced-order system is regarded as the slow subsystem of it
the proposed theory is derived based on the idea of singular perturbation. With rigorous mathematical proof
the properties of FOSR and ROSR are revealed. Moreover
a modified Energy Augmented Dynamic (EAD) algorithm and a constrained equidistant projection (CEP) approach are employed to estimate the ROSR and FOSR
respectively. The modified EAD algorithm and CEP form a so-called reduced-order stability region mapping (ROSRM) method. Finally
the proposed ROSRM method is applied to the IEEE 10-machine-39-bus power system
and simulation studies confirm its superiority to the traditional energy function method in terms of computational speed and reliability of results.