A novel DTC-SVM approach for two parallel-connected induction motors fed by matrix converter

Abstract

AC machines fed by a single inverter are widely used in industries such as railroad electrification systems where speed synchronization does not have to be exact. The low cost and volume and the small number of power electronic components are attractive aspects of single-inverter multi-motor systems. This paper proposes a novel approach to controlling the speed and torque of two induction motors connected in parallel and fed by a matrix converter under unbalanced load condition. This single-inverter dual-motor (SIDM) drive uses average and differential values of speed and torque together with stator and rotor flux parameters based on the flux dead-beat scheme. An advantage of the proposed approach, compared with the conventional direct torque control (DTC) method, is that it eliminates the lookup table and lowers the torque and current ripple through the use of the PI controller instead of hysteresis blocks. Combining DTC and space vector modulation (SVM) with a matrix converter (MC) and achieving the unit input power factor are other advantages of the present study. The main purpose of this study was to propose a new drive system with an MC for two parallel-connected induction motors using the DTC method and SVM consisting of a flux dead-beat scheme.

An investigation of flux characteristic in direct torque control using sector rotation strategy

“…The great development of DTC is by using space vector modulation, commonly called as DTC-SVM. This control strategy employs the synthesized principal in space vector modulator for sampling the reference stator voltage [11]- [13]. Although the constant switching frequency and the minimal torque and flux ripple are achievable, but it increases the burden in-computational of digital signal processing system to implement SVM.…”

Evaluation of the High Performance Indirect Field Oriented Controlled Dual Induction Motor Drive Fed by a Single Inverter using Type-2 Fuzzy Logic Control

“…Several couplings by criteria merging for multi-machine, multiconverter systems are presented in [9]. Several control solutions have been presented: a modified V/f control strategy for a multi-machine multi-inverter drive system is given in [10] and fuzzy sliding and DTC-SVM control of multi induction motors connected in parallel are presented in [11,12]. Authors in [13] present an optimal predictive torque control of two parallel permanent magnet synchronous machines fed with a single inverter.…”

“…To obtain a good dynamic response of the drive torque, two performance control strategies can be used to control twomachine systems with a single inverter: Field Oriented Control (FOC) [5,15,16,[21][22][23] and Direct Torque Control (DTC) [1,4,6,12,24]. The speed control of the dual identical induction motor drive connected in parallel to a SVPWM inverter supply using T2-FLC is investigated in this paper.…”