A static voltage stability detector using only local measurements of droop-controlled generators for stressed power distribution networks

Abstract

To assess static voltage stability in power networks, critical load values were examined at each load bus as a voltage instability predictor. However, the information that is required to evaluate loadability conditions is usually not available at load buses. To predict impending voltage collapse in a droop-controlled power distribution network, this paper introduces a static voltage stability detector that only uses local measurements at generator buses. The local stability detector derives a voltage threshold from dynamics of each droop-controlled generator. Monte Carlo simulations are conducted in the IEEE nine-bus network to evaluate the detector's receiver operating characteristic (ROC). Simulations show that the local voltage stability detector has a better performance than loadability conditions in a stressed power distribution network with droop-controlled generators and requires much less information to implement.