Symmetrical and Asymmetrical Multilevel Inverter Structures with Reduced Number of Switching Devices

Yatim, M. H.; Ponniran, Asmarashid; Zaini, Mohd.; Shaili, M. S.; Ngamidun, N. A. S.; Kasiran, A. N.; Bakar, Afarulrazi Abu; Jumadril, J. N.

doi:10.11591/ijeecs.v11.i1.pp144-151

Cited by 10 publications

(12 citation statements)

References 14 publications

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“…The current and voltage fluctuations are undesired behavior which should be improved since they adversely affect the losses and heating effects in the system load above the acceptable limits and consequently decreases the expected life of the battery in which the energy created by PV systems is stored. It also makes the regulation of the regulator worse since it generates a distortion not only in the current and voltage waves at the output of the regulator but also at its input which requires further control processors and makes its control more sophisticated and the dynamic behavior of the PV supply system unstable and less efficient [13][14][15][16].…”

Section: Multichannel Cúk Regulator With Uncoupled Filtersmentioning

confidence: 99%

Optimization of Cúk Voltage Regulator Parameters for Better Performance and Better Efficiency

Emar¹,

Al-Omari²,

Saraereh³

2019

IJACSA

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This paper discusses the harmonic distortion and voltage-current ripple minimization of a Cúk regulator based on the design optimization of its parameters using multichannel connection with uncoupled smoothing filters. The main attention is focused on the analysis and simulation of the fundamental and two-phase parallel connection of Cúk regulator with uncoupled smoothing filters. A detailed analysis has been done to show the benefits of uncoupled smoothing filters and their positive impact on balancing the energy compensation between the capacitors and inductors of the double-phase Cúk regulator as compared to conventional one. As a result of that the dc source current values do not go from positive to negative and vice versa as in the case of a fundamental connection which does not cause any saturation problem for the regulator. In general, multichannel parallel connection of Cúk regulators with uncoupled smoothing filters has ingrained benefits such as eminent current distribution characteristics, sacredness to component tolerance, reduction of parasitic effects and relief in current control complexity. Specifically, by employing double-phase connection with uncoupled smoothing filters for these regulators, overall current fluctuation can be effectively reduced by more than 25% after introducing the double-phase connection, compared to that of simple connection. Moreover, it is proved that the output voltage ripple of the double-phase connection is also reduced by more than 25% from that of the fundamental connection. Computer simulations using Simplorer 7 or Matlab and Excel have been done to validate the concepts.

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Section: Multichannel Cúk Regulator With Uncoupled Filtersmentioning

confidence: 99%

Optimization of Cúk Voltage Regulator Parameters for Better Performance and Better Efficiency

Emar¹,

Al-Omari²,

Saraereh³

2019

IJACSA

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“…The THD of the output voltage is changed from 28.9% to 2.92% for the modulation index from 0.09 to 1. In 2018 [21], symmetrical (7level) and asymmetrical (9-level) inverters with less power switching devices based on sinusoidal and modified square PWM were used. The THD of the output voltage for symmetrical and asymmetrical inverter are 16.4% and 15.2%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Asymmetrical Multilevel Inverter with Modified Absolute Sinusoidal PWM Technique for Sensorless Control of Induction Motor

Antar¹,

Sadiq²,

Saleh³

2020

Proceedings of the Proceedings of the 1st International Multi-Disciplinary Conference Theme: Sustainable Development and Smart

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Sensorless speed and torque control of a three-phase induction motor utilizing cascaded H-bridge inverter with unequal selected DC voltage sources (USDCVS) is presented in this study. Several output voltages with minimum distortions and IGBTs are achieved with DC input voltage sources equal to (1, 3, 9) Vdc. The induction motor speed and torque are estimated depending on the instantaneous output phase voltages and currents of the drive circuit. A novel controller circuit is built depending on a modified absolute sinusoidal PWM (MASPWM) technique. Embedded s-function is coded to regenerate switching pulses and get various output levels. Simulation results demonstrate that the USDCVS of the multilevel inverter based on MASPWM technique produces different output levels with acceptable distortion. Also, show an acceptable sensorless speed and torque responses at steady-state and dynamic operation conditions under different speeds and mechanical load torques that explained the strength of the drive and control circuits.

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“…1. For example, a 48 V nominal output voltage from a single input voltage source is useful in various cases such as electrical machines, light-emitting diode applications, solar energy systems, electric vehicle, data communication, and telecommunication power systems [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Modified single‐switch bridgeless PFC SEPIC structure by eliminating circulating current and power quality improvement

Noor

Ponniran

Rashid

et al. 2019

IET Power Electronics

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In this study, a modified single-switch bridgeless power factor correction (PFC) single-ended primary-inductor converter (SEPIC) structure is proposed. The major practical drawbacks of the existing structure are the presence of circulating current and high maximum current stress at the input capacitor and line diodes. Therefore, to overcome these problems, the existing structure is restructured by repositioning the line diodes in series with input inductors. Besides, the principle of design parameters optimisation is used based on the balancing energy compensation between input capacitors and output inductor. This structure is designed to operate in discontinuous conduction mode in order to achieve almost a unity power factor. The operation principle and design consideration of the modified structure is introduced in details. The experimental results demonstrate that the total harmonic distortion current is reduced from 56.3 to 4.9% after the optimisation process is performed, and at the same time the dead zones are inherently eliminated. Furthermore, it is shown that the output voltage ripple frequency is always double from the input line frequency of 50 Hz and the output voltage ripple is constantly lower than the maximum input voltage ripple. Thus, the designed parameters of the experimental converter are verified with ∼160 W of the converter output power.

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Symmetrical and Asymmetrical Multilevel Inverter Structures with Reduced Number of Switching Devices

Cited by 10 publications

References 14 publications

Optimization of Cúk Voltage Regulator Parameters for Better Performance and Better Efficiency

Optimization of Cúk Voltage Regulator Parameters for Better Performance and Better Efficiency

Asymmetrical Multilevel Inverter with Modified Absolute Sinusoidal PWM Technique for Sensorless Control of Induction Motor

Modified single‐switch bridgeless PFC SEPIC structure by eliminating circulating current and power quality improvement

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