Multipulse AC–DC Converter Fed 15-Level Cascaded MLI-Based IVCIMD for Medium-Power Application

Singh, Bhim; Kant, Piyush

doi:10.1109/tia.2018.2866401

Cited by 22 publications

(6 citation statements)

References 27 publications

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“…MLIs found use in various applications such as integration with renewable energy, stand-alone applications, induction motor drive, and grid-connected applications. [1][2][3] The use of renewable energy sources with MLI has resulted in reduced dependence on fossil fuels.…”

Section: Introductionmentioning

confidence: 99%

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

Kumar

Thangavelusamy

2019

International Journal of Electrical Engineering & Education

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An efficient pulse width modulation scheme for Cascaded H-Bridge inverter (CHBI) is proposed in this paper. The proposed modulation scheme is a low switching frequency modulation scheme termed as modified Nearest Level Modulation (mNLM) scheme. Compared to the conventional nearest level modulation (NLM) scheme, the proposed modulation scheme reduces the total harmonic distortion (THD) at the ac output of the inverter. The mNLM follows an algorithm presented in the paper in order to arrive at a set of switching angles for MLI which offers reduced THD. Simulation is carried out using MATLAB/Simulink 2015b software and hardware is presented which validates the simulation results. Results show that there is a notable reduction in the THD content with the use of proposed modulation scheme. Because of the improved THD content, improvement in the other inverter parameters such as rms voltage, rms current and increased output power is also observed.

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Section: Introductionmentioning

confidence: 99%

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

Kumar

Thangavelusamy

2019

International Journal of Electrical Engineering & Education

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“…Similarly, the set of 7th and 11th degree polynomial equations are formed. These polynomial equations are solved for unity modulation index by resultant theory method and the switching angles are obtained as θ 1 = 10.0154, θ 2 = 22.1424, θ 3 = 40.7521 and θ 4 = 61.7681 [9, 27, 28]. Remaining switching angles θ 5 to θ 16 are calculated by quarter‐wave symmetry of the CHB output voltage as shown in Figure 3 and given as, θ 5 = (180 − θ 4 ) , θ 6 = (180 − θ 3 ) , θ 7 = (180 − θ 2 ) , θ 8 = (180 − θ 1 ) , θ 9 = (180 + θ 1 ) , θ 10 = (180 + θ 2 ) , θ 11 = (180 + θ 3 ) , θ 12 = (180 + θ 4 ) , θ 13 = (360 − θ 4 ) , θ 14 = (360 − θ 3 ) , θ 15 = (360 − θ 2 ) and θ 16 = (360 − θ 1 ).…”

Section: Various Modulation Schemesmentioning

confidence: 99%

“…If the value of N is between zero and one, then level '0' is selected, if N is between one and two, Level '1' is selected, and so on. The switching sequence for the selected level is picked from Table 2 [28].…”

Section: Nearest Level Modulation-pwmmentioning

confidence: 99%

“…Table 2 specifies the switching sequence for a particular level. Switching sequences for the other two phases are determined in same manner as given in [28]. The required predefined step is as:

R_{normalp} = 1 and G = false(L_{T} - 1 false) / 2

where G is the number of positive steps in the 9‐level inverter, R p is predefined steps, and L T is the number of levels.…”

Section: Various Modulation Schemesmentioning

confidence: 99%

“…The NLM provided in the literature is also a suitable and more straightforward modulation technique for symmetric CHB multilevel converters, owing to the following reasons: first, the complex transcendental equations need not be solved to determine the angles of turn ON and OFF; second, because of the FFS employed in NLM, the switching losses decrease; and third, ease of implementation, irrespective of the number of levels [28][29][30][31][32][33][34]. The switching loss calculation is vital for assessing the impact of PWM frequency on system performance [35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Power quality investigation of CHB nine‐level converter based large‐scale solar PV system with different modulation schemes

Kulkarni

Yadav

Singh

et al. 2021

Energy Conversion and Econom

Self Cite

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Multilevel converters (MLCs) are extensively used in solar photovoltaic (SPV) applications owing to their advantages such as low total harmonic distortion (THD) in the converter voltage, reduction in device stress, and switching losses. A suitable modulation technique is important for the efficient closed‐loop control of megawatt (MW)‐scale solar photovoltaic plants. This work utilises different modulation techniques, such as phase‐shifted (PS) multicarrier pulse width modulation (PWM), selected harmonic elimination (SHE), and nearest level modulation (NLM), for switching of cascaded H‐bridge (CHB) converter‐based large‐scale SPV systems. The investigation on improving power quality is presented with a suitable fast Fourier transform (FFT) analysis and comparative graphs. The presented control and modulation enhance the power quality of the output current being fed to the grid in the dynamic solar profile. Moreover, the low switching frequency employed in this photovoltaic converter at a high power rating increases the system efficiency. Graphical illustrations of losses with fundamental and PWM switching were analysed for the MW‐rated system. The obtained results show that SHE‐PWM provides the best performance for large‐scale solar power plants. Furthermore, the IEEE‐519 standard was met for both grid voltages and currents. The system was modelled and simulated in MATLAB/Simulink and validated in a real‐time environment.

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Quality Improvement by Eliminating Harmonic Using Nature‐Based Optimization Technique

Kamaldeep¹,

Sharma²,

Kumar³

et al. 2022

Renewable Energy Systems

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Multipulse AC–DC Converter Fed 15-Level Cascaded MLI-Based IVCIMD for Medium-Power Application

Cited by 22 publications

References 27 publications

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

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

Power quality investigation of CHB nine‐level converter based large‐scale solar PV system with different modulation schemes

Quality Improvement by Eliminating Harmonic Using Nature‐Based Optimization Technique

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