Reduced torque ripple and switching frequency using optimal DTC switching strategy for open-end winding of induction machines

Rahim, M. Khairi; Patkar, Fazlli; Jidin, Auzani; Ahmadi, Muhd Zharif Rifqi Zuber; Firdaus, R. N.; Halim, Wahidah Abd; Razi, Atikah

doi:10.1109/peds.2015.7203506

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…Hence, the magnitude of stator voltage of short amplitude of voltage vector, ̅ ⁄ . The term in Equation (19) is expressed in (21) which it is represented for low speed condition. Therefore, by substituting (15), (20) and (21) into (19), the proportional gain for positive slope at low speed operation, ( ) can be written as follow:…”

Section: Case 1: Low Speed Operationmentioning

confidence: 99%

“…Multilevel inverters provide a higher number of voltage vectors than two-level inverters, hence offering more degree of freedom of vector selection. Lately, DTC drives fed by multilevel inverter such as Cascaded H-Bridge Multilevel Inverter (CHMI) [13], [14], Neutral Point Clamped (NPC) [15] and Flying Capacitor (FC) [16]- [17] as well as open-end winding configuration [18]- [19] have been considered for improvement of DTC performance.…”

Section: Introductionmentioning

confidence: 99%

“…The modelling of torque loop is required in order to determine the parameters the the PI controller [19]. First, the modelling of IM in stationary reference frame can be given as follows:…”

mentioning

confidence: 99%

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Constant Switching Frequency and Torque Ripple Minimization of DTC of Induction Motor Drives with Three-level NPC Inverter

Ismail¹,

Patkar²,

Jidin³

et al. 2017

IJPEDS

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Direct Torque Control (DTC) is widely applied for ac motor drives as it offers high performance torque control with a simple control strategy. However, conventional DTC poses some disadvantages especially in term of variable switching frequency and large torque ripple due to the utilization of torque hysteresis controller. Other than that, performance of conventional DTC fed by two-level inverter is also restricted by the limited numbers of voltage vectors which lead to inappropriate selection of voltage vectors for different speed operations. This research aims to propose a Constant Switching Frequency (CSF) torque controller for DTC of induction motor (IM) fed by three-level Neutral-Point Clamped (NPC) inverter. The proposed torque controller utilizes PI controller which apply different gain for different speed operation. Besides, the utilization of NPC inverter provides greater number of voltage vectors which allow appropriate selection of voltage vectors for different operating condition. Using the proposed method, the improvement of DTC drives in term of producing a constant switching operation and minimizing torque ripple are achieved and validated via experimental results.

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Section: Case 1: Low Speed Operationmentioning

confidence: 99%