access icon free Improved switching-table-based DTC strategy for the post-fault three-level NPC inverter-fed induction motor drives

In this study, a direct torque control (DTC) strategy based on a novel switching table for induction motor drives fed by the eight-switch three-phase inverter (ESTPI), which is the post-fault reconfigured topology for the three-level neutral-point-clamped inverter with the open-circuit fault occurring in a leg, is proposed to reduce the torque ripple and suppress the dc-link capacitor voltages offset. The influence of each basic voltage vector provided by the ESTPI on the stator flux, the electromagnetic torque and the dc-link capacitor voltages is analysed in detail, and the causes of the torque ripple and the capacitor voltages offset are also revealed. To suppress the dc-link capacitor voltages offset, a hysteresis comparator is added to regulate the dc-link capacitor voltages. Based on that, an optimised switching table to achieve not only torque ripple reduction but also dc-link capacitor voltages offset suppression is proposed. The feasibility and the effectiveness of the proposed DTC strategy are verified by simulations and experimental results.

Inspec keywords: magnetic flux; machine vector control; voltage control; stators; induction motor drives; torque control; invertors; hysteresis

Other keywords: dc-link capacitor voltage regulation; improved switching-table-based DTC strategy; post-fault three-level NPC inverter-fed induction motor drives; voltage vector; torque ripple reduction; stator flux; direct torque control; open-circuit fault; eight-switch three-phase inverter; three-level neutral-point-clamped inverter; hysteresis comparator; post-fault reconfigured topology; electromagnetic torque; ESTPI; dc-link capacitor voltages offset suppression

Subjects: Asynchronous machines; Mechanical variables control; Drives; Voltage control; Control of electric power systems; DC-AC power convertors (invertors)

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