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Toward Characterization of the Feasible Region of Loadability of Power Systems

The feasible region of loadability represents the allowable load range that yields the feasible operating points of power systems. In this paper, a complete characterization of the feasible region of loadability is developed. The theoretical work is then numerically verified on test systems using the exact AC power flow model. It is also shown that the current work based on the well-known DC power flow model may give inaccurate results (characterization), especially under different voltage constraints, the feasible region of loadability varies greatly. Finally, the proposed characterization of the feasible region is applied to the IEEE 118-bus test system to demonstrate its accuracy.