A Novel Control Scheme for Symmetric Seven Level Reduced Device Count Multi-Level DC Link (MLDCL) Inverter

Kumar, Kasoju Bharath; Bhanuchandar, Aratipamula; Mahesh, C

doi:10.1109/sefet48154.2021.9375714

Cited by 19 publications

(6 citation statements)

References 7 publications

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“…The field-oriented control has two closed loops which are of current and speed. The concept of PWM inverter used in the paper can also be replaced with a Multi-level DC link inverter with reduced switch count which reduces the number of heatsinks and gate driver circuits [6]. A ten-switch topology UPQC connected for AC machines can also reduce the switching losses [7].…”

Section: Introductionmentioning

confidence: 99%

Matrix Converter Fed Induction Motor Drive for Smooth Operation

Sekhar¹,

Kumar²

2022

INTERNATIONAL JOURNAL OF INNOVATIVE RESEARCH IN ELECTRICAL, ELE

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This paper a new technique of converter called matrix converter which supplies the induction motor for a smooth operation. Conventionally, the different type of multi-level inverters is used to feed the induction motor which is used in EVs where there are lot of torque ripples in the machine. Replacing the Multi-level inverters with a matrix converter, there is a very smooth operation under load and no-load conditions. The simulation results of the method are presented.

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Section: Introductionmentioning

confidence: 99%

Matrix Converter Fed Induction Motor Drive for Smooth Operation

Sekhar¹,

Kumar²

2022

INTERNATIONAL JOURNAL OF INNOVATIVE RESEARCH IN ELECTRICAL, ELE

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“…There are many Pulse width modulation techniques which are introduced for the switching control strategy of multi-level inverters such as PD (Phase disposition), UPD (Uni-polar phase disposition) and sinusoidal. The UPD PWM technique for a 7 level MLDCL inverter is described in Kumar et al (2021) with %THD as 19.31%. Generally, an LCL filter is used to reduce the %THD below 5% according to IEEE standards.…”

Section: Introductionmentioning

confidence: 99%

A nearest level control technique for an asymmetric source configuration of multi-level inverter topology

Kumar¹,

Bhanuchandar²,

Vamshy³

et al. 2022

Int. J. Eng. Sci. Tech

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In this paper, an asymmetric source configuration of Multilevel Inverter (MLI) topology has been proposed. It consists of eight unidirectional switches, two bidirectional switches and four isolated DC sources. By considering 1:5 and 1:4 source configurations, the inverter produces 25-level and 21-level outputs respectively with the same switching action. For producing negative voltage levels, there is no requirement of separate backend H-bridge and inherently produces both positive and negative voltage levels. The main advantage of this topology is that in every state, only four switches are in ON mode and else are in OFF state. It also gives less per unit Total Standing Voltage (TSV) and thereby cost requirement of semiconductor devices can become decreases. For generating gate pulses, the simple Nearest Level Control (NLC) has been used by considering the round function. This technique is basically a fundamental switching frequency technique thereby switching losses are greatly reduces as compared with high switching frequency Pulse Width Modulation (PWM) techniques and it is particularly suitable for large number of levels. With this control technique, there is no inrush current has been developed at the input of DC sources. Finally, with step change in Modulation Index (MI) values the proposed topology with two different source configurations have been validated through MATLAB/Simulink platform.

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“…For digital implementation, the system sampling frequency for the calculations of torque and flux should be very fast in order to provide good tracking performance and limit the errors of torque and flux within the specified bands, respectively.Theinverterswitchingfrequency,whichvaries withspeedofdrivesand the associated error bands, is very low in comparison with the system sampling frequency; a sampling frequency of 40 kHz gives the inverter switching frequency about 3kHz as shown in [7].Although the inverter switching frequency can be increased by mixing high frequency dither signals with the error signals of torque and flux [11], respectively, the inverter switching frequency is not constant for small error bands [8] and the difficulty of designing inverter output filter becomes difficult. For the DTC-based drives, the torque ripple is significantly for not invoking the zero inverter switching states; especially at motor start-up [9]or under transient state [10,12].…”

Section: Introductionmentioning

confidence: 99%

“…Normally, to provide constant inverter switching frequency, a space vector modulation (SVM) modulator is incorporated with direct torque control for induction motor drives as shown in [2], [11]. In [2], by considering several complicate calculations, a dead beat controller is used to generate the voltage command of SVM modulator which can be easily generated with high end Microprocessors.…”

Section: Introductionmentioning

confidence: 99%

Direct Torque Control of Induction Motors using Speed Estimator

2021

IJETER

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A new approach to Direct torque control of induction motor is presented in this paper.A ripple in torque of the induction motor is a very common problem and it is to bereduced. In conventionalDTCmethodstheinverter has constant switching frequency and is dramatically increased. In proposed DTC based induction motor drive, an improved space vector modulation technique is applied to inverter control, therefore reducingthe torque/speed ripples. As the proposed approach does not include any dead beat control or hysteresis control, it automatically reduces computational calculations. Simulation results of proposed DTC based induction motor drive technique is validated using MATLAB/SIMULINK environment

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A Novel Control Scheme for Symmetric Seven Level Reduced Device Count Multi-Level DC Link (MLDCL) Inverter

Cited by 19 publications

References 7 publications

Matrix Converter Fed Induction Motor Drive for Smooth Operation

Matrix Converter Fed Induction Motor Drive for Smooth Operation

A nearest level control technique for an asymmetric source configuration of multi-level inverter topology

Direct Torque Control of Induction Motors using Speed Estimator

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