A Comparison of Symmetrical and Asymmetrical Three-Phase H-Bridge Multilevel Inverter for DTC Induction Motor Drives

Khoucha, Farid; Lagoun, M. S.; Kheloui, Abdelaziz; Benbouzid, Mohamed

doi:10.1109/tec.2010.2077296

Cited by 119 publications

(45 citation statements)

References 26 publications

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“…The switching state pattern of the proposed modulation is shown in Figure 7. Simulation and experimental implementation of the proposed NLV-SVC modulation strategy to a 3-cell asymmetrical multilevel inverter [9,10,[15][16][17] is compared with the NVC modulated results and discussed in Section 4. The experimental implementation and performance analysis of NLV-SVC and NVC modulation strategies are carried out by the low-power (1Φ) model.…”

Section: Methodology For Proposed Strategymentioning

confidence: 99%

Modeling hybrid modulation strategy with nearest leveled vector switching pattern in space vector control technique for multilevel inverters

Jonnala¹,

Babu²

2017

Turk J Elec Eng & Comp Sci

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Abstract:The multilevel inverter's impact in the area of power electronics is augmented because of its nimble nature. This paper presents an efficient switching pattern for multilevel inverters using the nearest leveled vector (NLV) strategy through a space vector control (SVC) technique. The objective is to reduce the total harmonic distortions by generating an optimal switching sequence with the newly introduced NLV-SVC for multilevel inverters. The proposed NLV modulation is applied for an asymmetrical multilevel inverter, which has a high number of levels with reduced switch count, sources, and lower switching losses. The effectiveness of the proposed method is verified on a 27-level 3-cell asymmetrical multilevel inverter. The efficacy of the proposed method in terms of total harmonic distortions is compared with the existing nearest vector control (NVC) modulation strategy. Implementation and experimental verification of the proposed NLV-SVC modulation strategy for an asymmetrical cascaded H-bridge multilevel inverter is presented for real-time validation with the comparison of the NVC modulation strategy.

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Section: Methodology For Proposed Strategymentioning

confidence: 99%

Modeling hybrid modulation strategy with nearest leveled vector switching pattern in space vector control technique for multilevel inverters

Jonnala¹,

Babu²

2017

Turk J Elec Eng & Comp Sci

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“…Each H-bridge power cell which is the building block for the cascaded H-bridge inverter is supplied by an isolated dc source on the dc side. Batteries, fuel cells or ultra-capacitors are used as isolated dc sources [10]. Fig.…”

Section: Cascaded H-bridge Multilevel Invertermentioning

confidence: 99%

Performance evaluation of Symmetrical and Asymmetrical Cascaded H Bridge Multilevel Inverter Topology

Prayag¹,

Bodkhe²

2017

IJERA

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“…By using (9) - (14) in the stationary reference frame, the positive and negative torque slope are obtained by [39,40] …”

Section: Structure and Modeling Of The Dtc With Constant Switching Frmentioning

confidence: 99%

Constant Frequency Torque Controller for DTC with Multilevel Inverter of Induction Machines

Nordin

Azli

Idris

et al. 2016

IJPEDS

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Direct Torque Control using multilevel inverter (DTC-MLI) with hysteresis controller suffers from high torque and flux ripple and variable switching frequency. In this paper, a constant frequency torque controller is proposed to enhance the DTC-MLI performance. The operational concepts of the constant switching frequency torque controller of a DTC-MLI system followed by the simulation results and analysis are presented. The proposed system significantly improves the DTC drive in terms of dynamic performance, smaller torque and flux ripple, and retains a constant switching frequency. Keyword:Constant INTRODUCTIONSince it has been introduced in early 1980s [1], Direct Torque Control (DTC) has gained its popularity in electrical drives research area. Recently, the application of high-power medium voltage in AC drives has shown rapid development. Thus, the use of multilevel inverters in DTC scheme has become an important structure for further development and improvement. Numerous technical papers have shown a superior performance of DTC scheme using multilevel inverters .By utilizing the multilevel inverter in DTC scheme, the choices of voltage vectors that can be used to control the torque and flux are increased. As a result, more precise control can be obtained. Several control method have been proposed for DTC scheme using multilevel inverter (DTC-MLI); hysteresis-based and non-hysteresis-based such as predictive control strategy [11,15,17,18,20,22,26,27,30], space vector modulation strategy [2, 4, 8-10, 14, 21, 28, 29, 33] and fuzzy logic control strategy [3,5,7,19,31,[34][35][36].The employment of hysteresis-based control strategy in discrete implementation has led to high torque ripple even with a small hysteresis band. This is due to the delay in sampling time. Besides that, it created a variable switching frequency of the switching devices which leads to an unpredictable harmonics current.As a result, some researchers preferred to use non-hysteresis-based control strategy. Significant improvements are accomplished in terms of flux and torque ripple and devices switching frequency. However it involves a complex mathematical equations and algorithm which has led to the complexity of the DTC-MLI scheme and high computational burden particularly when the multilevel inverter's level is increased.

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A Comparison of Symmetrical and Asymmetrical Three-Phase H-Bridge Multilevel Inverter for DTC Induction Motor Drives

Cited by 119 publications

References 26 publications

Modeling hybrid modulation strategy with nearest leveled vector switching pattern in space vector control technique for multilevel inverters

Modeling hybrid modulation strategy with nearest leveled vector switching pattern in space vector control technique for multilevel inverters

Performance evaluation of Symmetrical and Asymmetrical Cascaded H Bridge Multilevel Inverter Topology

Constant Frequency Torque Controller for DTC with Multilevel Inverter of Induction Machines

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