NDLI: Improved switching-table-based DTC strategy for the post-fault three-level NPC inverter-fed induction motor drives

Content Provider	IET Digital Library
Author	Tang, Qidi Ge, Xing Lai Liu, Yong Chao Hou, Maojun
Abstract	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.
Starting Page	71
Ending Page	80
Page Count	10
ISSN	17518660
Volume Number	12
e-ISSN	17518679
Issue Number	Issue 1, Jan (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/12/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2017.0354
Journal	IET Electric Power Applications
Publisher Date	2017-08-16
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Asynchronous Machine Control of Electric Power System Dc-link Capacitor Voltage Offset Suppression Dc-link Capacitor Voltage Regulation Direct Torque Control Drive Eight-switch Three-phase Inverter Electromagnetic Torque ESTPI Hysteresis Hysteresis Comparator Improved Switching-table-based DTC Strategy Induction Motor Drive Invertors Machine Vector Control Magnetic Flux Mechanical Variables Control Open-circuit Fault Post-fault Reconfigured Topology Post-fault Three-level NPC Inverter-fed Induction Motor Drive Stator Flux Stators Three-level Neutral-point-clamped Inverter Torque Control Torque Ripple Reduction Voltage Control Voltage Vector
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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