Online prediction of voltage collapse using subset of system measurements

Modern power transmission system operate closer to their maximum capacity due to economic limitation and environmental regulations. As a consequence, power systems around the world experience voltage collapse incidence leading to partial or complete blackouts. In this paper a new wide area protection scheme to prevent from voltage collapse based on subset of current and voltage measurements is developed. The developed algorithm takes into consideration not only the current state of the system but also future load increase. The technique improves the performance of the commonly used local-based protection schemes. The developed method was tested on the IEEE 30-Bus test system for different operational scenarios. The results obtained from simulation studies indicated that the algorithm is able to estimate system parameters and also calculate time to voltage collapse.