An Improved Direct Torque Control for Three-Level Inverter-Fed Induction Motor Sensorless Drive

A sensorless three-level neutral-point-clamped inverter-fed induction motor drive is proposed in this paper. The conventional direct torque control (DTC) switching table fails to consider the circuit limitations, such as neutral-point-balance and smooth vector switching, caused by the topology of a...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2012-03, Vol.27 (3), p.1502-1513
Main Authors: Yongchang Zhang, Jianguo Zhu, Zhengming Zhao, Wei Xu, Dorrell, D. G.
Format: Article
Language:English
Subjects:
AC motor drives
adaptive observer
Applied sciences
Circuit topology
Circuits
Control systems
Electrical engineering. Electrical power engineering
Electrical machines
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Fuzzy logic
induction motor (IM) drives
Induction motor drives
Induction motors
Integrated circuits
Integrated circuits by function (including memories and processors)
Inverters
Power electronics, power supplies
Regulation and control
Robustness
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Sensorless control
Sensors
Simulation
speed sensorless
Switching
Switching circuits
three-level inverter
Torque control
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Summary:A sensorless three-level neutral-point-clamped inverter-fed induction motor drive is proposed in this paper. The conventional direct torque control (DTC) switching table fails to consider the circuit limitations, such as neutral-point-balance and smooth vector switching, caused by the topology of a three-level inverter. Two kinds of modified schemes for three-level DTC are proposed to solve these problems. They also provide performance enhancement while maintaining robustness and simplicity. Fuzzy logic control and the speed-adaptive flux observer (with novel gain and load toque observation) are introduced to enhance the performance of the system. The issue of large starting current is investigated and solved by introducing the technique of preexcitation. A 32-bit fixed-point DSP-based motor drive is developed to achieve high-performance sensorless control over a wide speed range. The effectiveness of the proposed schemes is confirmed by simulation implementation and experimental validation.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2010.2043543