The method for determination harmonic content of the stator phase current of induction motor (IM) that is powered with an autonomous voltage inverter (AVI) in controlled traction and industrial drives systems is proposed. The stator current is one of the main adjustable parameters for automatic control systems of drives indicated earlier. Knowing about the real meaning of the stator current first harmonic, which determines the IM output characteristics, it is possible to realize this current identification more exactly, which is necessary for the control and regulation IM parameters. The proposed method is faster and more accurate than the method based on the IM regulation with average or amplitude current values.
harmonic composition, phase current, induction motor, autonomous voltage inverter