Improved application of power acceptability curves and their application to certain three-phase loads

The electric power acceptability curves are loci in the bus voltage-disturb ance time plane. These loci separate regions of operation into "acceptable" and 'inacceptable." Several power acceptability curves exist, and this pap er discusses a constant energy model for the derivation of the curves. The application of the curves is discussed. The main foibles of the curves in t he undervoltage disturbance region are that they do not model three-phase e ffects and they were not designed for rotating loads. The paper proposes a solution to these drawbacks. The use of power acceptability curves for thre e-phase induction motors and six-pulse rectifier loads is discussed.