Behavior of DC link voltage source inverters with closed-loop controlled output current

The behavior of drives can be improved significantly by inverters whose output provides a closed-loop controlled AC current system of variable frequency and amplitude instead of an open-loop controlled AC voltage. The closed-loop control detects and compensates for the nonideal switching behavior of the power semiconductors and for delays in the signal flow. The author presents a description of a control system for induction motors in inverter drives for general applications which is based on direct closed-loop control of the inverter output currents