A survey of low-switching frequency modulation techniques for medium-voltage multilevel converters

Edpuganti, Amarendra; Rathore, Akshay Kumar

doi:10.1109/ias.2014.6978399

Cited by 37 publications

(30 citation statements)

References 69 publications

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“…Multilevel inverters consist of a number of switches compared to two-level inverter topology, and thus, modulation results in increased complexity. A number of schemes have been developed and adopted, each with its own unique merits and demerits, depending upon the application and inverter topology [12], [13]. In the case of a multilevel inverter, the most discussed modulation schemes are multicarrier sine pulse width modulation (multicarrier-SPWM), selective harmonic elimination (SHE) and space vector PWM (SVPWM).…”

Section: B Modulation Schemementioning

confidence: 99%

“…The last few decades have witnessed vital advancements in modulation and control strategies for MLIs; however, these developments have concentrated mainly on optimising parameters, such as switching frequency, harmonic distortion, switching loss, etc. [12], [13]. Hence, to ensure proper power management of the voltage sources, an effective charge balance control scheme has to be incorporated along with the modulation scheme [14], [15].…”

Section: Introductionmentioning

confidence: 99%

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A Modified Charge Balancing Scheme for Cascaded H-Bridge Multilevel Inverter

Raj¹,

Jagadanand²,

George³

2016

Journal of Power Electronics

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Cascaded H-bridge multilevel inverters are currently used because it enables the integration of various sources, such as batteries, ultracapacitors, photovoltaic array and fuel cells in a single system. Conventional modulation schemes for multilevel inverters have concentrated mainly on the generation of a low harmonic output voltage, which results in less effective utilization of connected sources. Less effective utilization leads to a difference in the charging/discharging of sources, causing unsteady voltages over a long period of operation and a reduction in the lifetime of the sources. Hence, a charge balance control scheme has to be incorporated along with the modulation scheme to overcome these issues. In this paper, a new approach for charge balancing in symmetric cascaded H-bridge multilevel inverter that enables almost 100% charge balancing of sources is presented. The proposed method achieves charge balancing without any additional stages or complex circuit or considerable computational requirement. The validity of the proposed method is verified through simulation and experiments.

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Section: B Modulation Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Modified Charge Balancing Scheme for Cascaded H-Bridge Multilevel Inverter

Raj¹,

Jagadanand²,

George³

2016

Journal of Power Electronics

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“…In the high power PGI, the switching frequency can be hundreds hertz per second [17]- [18]. Moreover, considering the worst voltage sag condition, the ITC could reach the destructive value of the semiconductor.…”

Section: Digital Controllermentioning

confidence: 99%

Inrush Transient Current analysis and suppression of photovoltaic grid-connected inverters during voltage sag

Zhao

Xin

et al. 2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Abstract-The Inrush Transient Current (ITC) in the output of the photovoltaic grid-connected inverters is usually generated when grid voltage sag occurs, which can trigger the protection of the grid-connected inverters, and even destroy the semiconductor switches. Then, the grid-connected inverters will thus fail to ride through the voltage sag and even further cause more serious grid faults. This paper analyzes the generation principle of ITC and explores its influence factors, upon which, the suppression approaches are presented. Simulation and experimental results validate the theoretical analysis and the effectiveness of the proposed method.

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“…These switching techniques can be categorized into high and low frequency ones [6,8]. Multilevel PWM and space vector PWM [9] belong to the former and SHE [10,11] as well as OMTHD [12] are examples of the latter, in which reducing harmonic content is considered more.…”

Section: Introductionmentioning

confidence: 99%

An improved OMTHD technique for an $n$-level cascaded multilevel inverter with adjustable DC sources

Toodeji¹

2017

Turk J Elec Eng & Comp Sci

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Optimal minimization of total harmonic distortion (OMTHD) and selective harmonic elimination (SHE) switching techniques are usually employed to reduce generated harmonics of multilevel inverters. In the former technique, the THD of waveform is reduced without elimination of any harmonic order and the latter, in contrast, eliminates selected harmonic orders. In this paper, the harmonic elimination ability of the SHE technique is added to OMTHD and an improved OMTHD technique is proposed for an n -level cascaded multilevel inverter with adjustable DC sources. The main novelty of this switching technique is elimination of some harmonic orders, beside THD minimization. Moreover, optimal DC voltages and switching angles can be estimated simpler than conventional OMTHD technique. To show the advantages of the proposed technique, which is formulated for an n -level inverter, a 7-level one is simulated in MATLAB/Simulink with both improved and conventional OMTHD techniques. The obtained results show the elimination of two elective harmonics as well as THD minimization. Moreover, experiments on a 7-level inverter verify the superiority of the proposed technique.

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A survey of low-switching frequency modulation techniques for medium-voltage multilevel converters

Cited by 37 publications

References 69 publications

A Modified Charge Balancing Scheme for Cascaded H-Bridge Multilevel Inverter

A Modified Charge Balancing Scheme for Cascaded H-Bridge Multilevel Inverter

Inrush Transient Current analysis and suppression of photovoltaic grid-connected inverters during voltage sag

An improved OMTHD technique for an $n$-level cascaded multilevel inverter with adjustable DC sources

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