Open AccessImproved sensorless direct torque control method using adaptive flux observer
Author(s) -
Saberi Hossein,
Sabahi Mehran,
Sharifian Mohammad Bagher Bannae,
Feyzi Mohammadreza
Publication year - 2014
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2013.0390
Subject(s) - control theory (sociology) , direct torque control , stator , torque , vector control , observer (physics) , state observer , rotor (electric) , computer science , inverter , induction motor , engineering , physics , control (management) , voltage , nonlinear system , quantum mechanics , artificial intelligence , electrical engineering , thermodynamics , mechanical engineering
A simple structure and a quick and robust response of the direct torque control (DTC) makes it attractive in ac drives. However, in sensorless applications, a precise estimation of the rotor speed is a crucial issue as along with the torque and flux estimation. In this paper an adaptive flux observer is introduced with a stator current and flux vector components as state variables and rotor speed as an unknown parameter which is estimated by using an adaptive scheme. A non‐linear inverter model is proposed to obtain a more accurate response. Also, torque, flux and current pulsations, during the steady‐state conditions, are considered as the disadvantages of the classical DTC method. A combined DTC and space vector modulation strategy is presented by using fuzzy logic control (FLC). FLCs are designed to obtain a fast response in the transients, and a high accuracy during the steady‐state conditions.