Review of Multilevel Inverters and Their Control Techniques

Tashiwa, Ibrahim Emmanuel; Dung, Gyang Davon; Adole, Benson Stephen

doi:10.24018/ejeng.2020.5.6.1707

Cited by 5 publications

(4 citation statements)

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“…There are two general switching techniques for the multilevel inverter which are called as high switching frequency (HSF) and fundamental switching frequency (FSF) [25]. In the HSF switching techniques such as multi-carrier pulse width modulation (MC-PWM), one full sinusoidal wave is compared with several sawtooth waves with switching frequencies higher than 2kHz.…”

Section: Nearest Level Controlmentioning

confidence: 99%

A New Generalized Step-up Multilevel Inverter Topology Based on Combined T-type and Cross Capacitor Modules

Salehi

Shmasi-Nejad

Najafi

2023

IJE

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This paper presents a new symmetrical switched-capacitor (SC) multilevel inverter topology which can convert the input DC voltage to a step-up multilevel AC waveform on the load. This proposed multilevel inverter consists of one T-type and several cross-capacitor modules. The structure of the generalized multilevel inverter is such that the peak inverse voltage (PIV) remains constant as the number of crosscapacitor modules increases which leads to reduce the total standing voltage (TSV) of the switches and cost function compared to other traditional topologies. The introduced structure can inherently generate the positive, negative, and zero voltage levels on the output without the back-end H-bridge section. The capacitor's voltages in the T-type and cross modules are inherently balanced, simplifying the control system under the nearest level control (NLC) switching strategy. To verify the performance of the proposed topology, several simulations and experimental results for a type 13-level inverter are provided by MATLAB and TMS320F28379D DSP, respectively.

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Section: Nearest Level Controlmentioning

confidence: 99%

A New Generalized Step-up Multilevel Inverter Topology Based on Combined T-type and Cross Capacitor Modules

Salehi

Shmasi-Nejad

Najafi

2023

IJE

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“…Nevertheless, in order to attain a high number of output voltage levels, these conventional MLIs require more semiconductors (switches and diodes), capacitors, and DC sources [5][6][7]. To overcome *Corresponding Author Institutional Email: ja_siah@yahoo.com (J. Siahbalaee) these issues, researchers have proposed several switchedsource (SSMLI) and switched capacitor multilevel inverters (SCMLI) which need a lower quantity of devices to provide more voltage levels [8][9][10][11][12][13][14]. Although SSMLI topologies can give rise to structures consisting of only a few devices they are not able to provide a voltage boost on the output inverter.…”

Section: Introductionmentioning

confidence: 99%

A Novel 19-Level Boost Type Switched-capacitor Inverter with Two DC Sources and Reduced Semiconductor Devices

Sagvand

Siahbalaee

Koochaki

2023

IJE

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In this paper, a novel voltage-boosting switched-capacitor multilevel inverter (SCMLI) capable of producing 19 voltage levels using a combination of only 10 switches, 4 diodes, 2 capacitors, and 2 DC sources has been proposed. The main features of the proposed topology are 1) utilization of a very low number of devices, 2) very low Total Standing Voltage (TSV) equal to 6.55 and 3) self-balance property of the capacitors' voltages. In order to provide the IGBTs of the circuit with the desired switching signals, the Nearest Level Control (NLC) method has been adopted. To clarify the benefits of the designed topology as to the total quantity of switches, DC sources, capacitors as well as the total standing voltage (TSV), and converter boosting, a thorough comparison has been carried out versus the recently published 19-level topologies. Also, for the purpose of performance evaluation and validation, the suggested topology has been tested against various loads through an experimental setup in the laboratory using TMS320F28379D DSP as the processor. The comparative, simulation, and experimental results all imply the superiority of the proposed topology against its predecessor counterparts.

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“…The inverters are classified depending on the waveform's shape, comprising square wave inverters, two‐level pulse width modulation (PWM) inverters, and MLI 4 . Among all these inverters, MLI offers numerous features like high operating voltage with reduced voltage stress on the power switches, better harmonic profile, offers minimum conduction and switching losses, more levels in output voltage, and enhanced efficiency.…”

Section: Introductionmentioning

confidence: 99%

Grid integration of three phase solar powered fault‐tolerant cascaded H‐bridge inverter

Rajesh

Nakka

Kishore

2022

Circuit Theory & Apps

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Grid integration of solar photovoltaic (PV) systems is becoming popular recently due to the merits of stable support to conventional grid, limiting global warming and reduced emissions. However, maintaining capacitor voltage balancing, unity power factor, sinusoidal grid current, and harmonic profile improvement are challenging tasks owing to change in irradiation conditions. Multilevel inverters (MLI) in grid-connected systems will enhance the system's power quality in terms of voltage and current total harmonic distortion (THD). One of the most promising multilevel topologies for renewable energy applications is the cascaded H-bridge (CHB) inverter. Since CHB inverters include many components, they have a higher risk of failure, lowering system reliability. Due to the change in irradiation condition, the voltage across the corresponding DC link capacitor may vary. Therefore, the DC-link capacitor balancing is mandatory and done by an individual control scheme. This paper presents a highly reliable, robust, and modular solar PV-fed faulttolerant CHB inverter with an individual voltage/current control strategy for grid integration. Higher reliability and modularity, power factor correction, and harmonic profile improvement are the main objectives of the proposed system. The proposed system has been simulated in MATLAB/Simulink and validated with experimental results on the developed prototype for different irradiation conditions.

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Review of Multilevel Inverters and Their Control Techniques

Cited by 5 publications

References 0 publications

A New Generalized Step-up Multilevel Inverter Topology Based on Combined T-type and Cross Capacitor Modules

A New Generalized Step-up Multilevel Inverter Topology Based on Combined T-type and Cross Capacitor Modules

A Novel 19-Level Boost Type Switched-capacitor Inverter with Two DC Sources and Reduced Semiconductor Devices

Grid integration of three phase solar powered fault‐tolerant cascaded H‐bridge inverter

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