RETRACTED: A modified nearest level modulation scheme for symmetric and asymmetric configurations of cascaded H-bridge inverter

Kumar, A. Rakesh; Thangavelusamy, Deepa

doi:10.1177/0020720919858844

Cited by 12 publications

(11 citation statements)

References 28 publications

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“…Multilevel inverters are used in power systems for its better quality of output waveform. Cascaded H-Bridge MLI and MLI with reduced number of switches based TDVC are the two categories of MLI based TDVCs [13,14]. MLI with lesser components count is also an important factor for considering the size and losses in the inverter [15].…”

Section: Comparison Of Existing Tdvcmentioning

confidence: 99%

“…Phase Lock Loop (PLL) connected to generates ɷt1. Matrix Equation(14) gives Park transformation through which voltage direct axis , and quadrature axis , are determined as per Equations(15- 16). By the same Clark and Park transformation method, the reference three phase voltages is converted into reference direct and quadrature voltage axis , and , respectively.…”

mentioning

confidence: 99%

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Voltage Quality Enrichment using Transformerless Dynamic Voltage Compensator based on Asymmetrical Multilevel Inverter

Ravi

2020

Gazi University Journal of Science

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Section: Comparison Of Existing Tdvcmentioning

confidence: 99%

mentioning

confidence: 99%

Voltage Quality Enrichment using Transformerless Dynamic Voltage Compensator based on Asymmetrical Multilevel Inverter

Ravi

2020

Gazi University Journal of Science

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“…Therefore, the random PWM strategies along with three main modulations are: Randomized Carrier-Based (RCB), Randomized Space Vector (RSV), and Dithered Sigma-Delta (DSD). In last 40 years, RPW strategy have been applied for DC-AC converters [9]- [12], random multi-carrier inverter [13]- [14], and filter active converter circuits [15]. In proposed system is reduced cost of the filter.…”

Section: Introductionmentioning

confidence: 99%

Power Quality Improvement in Modular Multilevel Inverter Using for Different Multicarrier PWM

Kaliannan¹,

Albert²,

Begam³

et al. 2021

EJECE

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Pulse width modulation (PWM) is a powerful technique employed in analog circuit convert with a microprocessor based digital output. Besides, Pseudo Random Multi Carrier (PRMC) involves in two random PWM strategies to minimize the harmonic order for 9- level cascaded multilevel H-bridge (CHB) inverter and 9-level Modular Multilevel inverter are introduced. The design mainly focuses on the (Pulse Width Modulation) PWM method, in which two nearest voltage levels are approached in estimated output voltage prediction based on the Partial swarm optimization (PSO) algorithm, and it conveys a random variation in the pulse position of output by Pseudo Random Multi Carrier- Pulse Width Modulation (PRMC-PWM). The CHB and the Modular inverters generate low distortion output by using PMRC. The simulation and prototype circuit are developed for the nine level output using sixteen switches and ten with Resistive-Inductive (R-L) load variation condition. The power quality is improved in CHB and Modular inverter (MoI) with minimized harmonics in various modulation index (MI) as varied from 0.1 up to 0.8. The circuit is designed by using a Field Programmable Gate Array (FPGA), Implementing a PSO algorithm for both CHB, and MoI are proposed. The comparisons of results are verified with lower order harmonics and find the best switching angle across the MLI switches. Modular inverter furthermore investigates with PRMC, Random Nearest level (RNL) modulation scheme are presented, and the proposed circuit is along with the respective degree of the output voltage were synthesized in non-linear load by the development of reactive power across a motor load.

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“…In modular multilevel inverters the number of levels in output QSW changes with the addition or removal of the modules, the features and advantages mentioned above make the SAC methods more suitable for calculation of new switching angles 61 . Therefore, the SAC methods are more attractive compared to other fundamental frequency methods and are widely used 62‐81 …”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of switching angle calculation methods for multilevel inverters

Muthyala

Dhabale

2021

Int Trans Electr Energ Syst

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Summary A multilevel inverter produces an output to approximate a desired sine wave. The closeness of the output waveform to the sine wave depends on the logic applied for switching angle calculation, resulting in different switching angle calculation methods. In this paper, various switching angle calculation methods are compared based on of the parameters quantifying the quality of the output waveform. The main focus of this work is on the study of convergence of the output waveform to a smooth waveform as number of levels increases theoretically. The convergence is analytically proved and validated numerically by computing up to 201 levels. Also, a parameter quantifying the deviation of the output waveform from the sine wave is defined, and its closed form expression is derived. This parameter is strongly correlated to and computationally less expensive than the total harmonic distortion. Hence, the deviation is proposed as a better measure of the quality of the output wave form. The convergence and the deviation of the output waveform are also used as the basis of the comparison of different switching angle calculation methods. These two give a better insight into the switching angle calculation methods. The analysis presented in this paper provides a good understanding of various switching angle computation methods and helps in choosing an appropriate method for a given application.

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RETRACTED: A modified nearest level modulation scheme for symmetric and asymmetric configurations of cascaded H-bridge inverter

Cited by 12 publications

References 28 publications

Voltage Quality Enrichment using Transformerless Dynamic Voltage Compensator based on Asymmetrical Multilevel Inverter

Voltage Quality Enrichment using Transformerless Dynamic Voltage Compensator based on Asymmetrical Multilevel Inverter

Power Quality Improvement in Modular Multilevel Inverter Using for Different Multicarrier PWM

Comparative analysis of switching angle calculation methods for multilevel inverters

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