Energy Analysis of a Three-Phase Induction Motor Under Unbalanced Voltage Using Simulation and Symmetrical Component

Three phase induction motors are widely used in industrial, commercial and residential systems, because of their ruggedness, simplicity and relatively low cost. Approximately 65% of the electricity consumed in industry is used to drive electrical motors. Therefore, the efficiency and reliability of induction motors operation is of major importance, in order to improve the energy efficiency in industry [1], and most of them are connected to electric power distribution system directly, thus they will be affected by voltage quality problems. An important voltage quality problem in power systems is voltage unbalance. Therefore, it is very important to study performance of these motors under unbalanced voltages. The paper tries to study the effect of voltage unbalance on the motor 3-phase negative sequence currents, toque and energy consumption. Further MATLAB/SIMULINK and environments have been used simultaneously for simulation purpose and uses from symmetrical components analyses.