Predictive out-of-step relay based on equal area criterion and PMU data

摘要

This paper proposes a novel‐predictive and setting‐free out‐of‐step protectionrntechnique based on synchronized phasor measurements and equal area criterion.rnGenerator instability is predicted by comparing the acceleration and decelerationrnareas corresponding to the fault and postfault conditions, respectively. For eachrngenerator, the acceleration area during fault condition is calculated directly usingrnthe generator output power and rotor angle in real time. As soon as the fault isrncleared, the deceleration area is predicted based on estimating the postfault Théveninrnequivalent of the power network. The proposed technique is verified on the NewrnEngland 39‐bus test network. The effect of the proposed technique on improvementrnof the power network stability is compared with that of the well‐known impedancebasedrnout‐of‐step relay.