Correction of operating condition of a variable-frequency electric drive with a non-linear and asymmetric induction motor

The necessity for compensation for induction motor three-phase active power and electromagnetic torque oscillating components caused by its asymmetry and nonlinearity is grounded. A method of these components compensation by means of variable-frequency electric drive is offered. Expressions for determination of corrective voltage for compensation for oscillating components of three-phase instantaneous active power and electromagnetic torque are substantiated. The efficiency of the offered method is demonstrated on the basis of the results of modeling the operation of variable-frequency electric drive with an asymmetric induction motor. It is shown that the application of this method additionally results in decrease of thermal overload at particular phases.