Phasor measurement based voltage sensitivities for contingency analysis

This paper presents a new approach to voltage estimation for N-1 contingency analysis. The voltage magnitude after a single line or generator outage is estimated using a voltage sensitivity matrix. The sensitivity matrix is derived using phasor measurements during normal operation. This technique is compared to the traditional voltage sensitivity calculation using the Jacobian of the system, which is based on the admittance matrix. Both methods are tested on the IEEE 118 bus system and the errors are measured by comparing each set of results with the actual post-contingency voltage. The test results show that the phasor measurement-based method provides a more accurate approximation.