Voltage magnitude contingency ranking: bounded network approach

Contingency ranking and selection is one of the major tools for static security analysis. Several performance indices suffer either from misranking or computational inefficiencies. This paper presents a new computational method for voltage magnitude selection and ranking. The proposed bounded network approach formulates a line outage as a local nonlinear constrained optimization problem. Optimization is used as a feedback to correct the errors resulting from linearized equations. The method provides more accurate calculation of post-outage load bus voltage magnitudes with less computational effort. The method is applied to IEEE test systems and the results are compared with those obtained using the full power flow.