DC (direct current) voltage source reduction in stacked multicell converter based energy systems

Vahidinasab, Vahid; Sadigh, Arash Khoshkbar; Pahlavani, Mohammad Reza Alizadeh; Shoulaie, Abbas

doi:10.1016/j.energy.2012.07.005

Cited by 29 publications

(17 citation statements)

References 38 publications

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“…These converters are particularly designed to be exploited in the energy and power conversion areas requiring high efficiency, high-power demand and power quality [3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Neutral point clamped, cascaded H-bridge and flying-capacitor multicell (FCM) are the most common commercialised topologies and breeds of multilevel converters powering wide range of applications in industry [4][5][6][7][8][9][10][11][12]. The most noteworthy advantages and features of voltage/current source multilevel power converters are the higher voltage/current handling capability, higher efficiency and the improved harmonic content of the synthesised output voltage waveform [5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…The most noteworthy advantages and features of voltage/current source multilevel power converters are the higher voltage/current handling capability, higher efficiency and the improved harmonic content of the synthesised output voltage waveform [5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Flying‐capacitor stacked multicell multilevel voltage source inverters: analysis and modelling

Dargahi

Babaei

Eskandari

et al. 2014

IET Power Electronics

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The aim of this study is to investigate the natural voltage balancing dynamics of the single/three-phase stacked multicell converters (SMCs). First, explicit analytic solutions for switching functions' implicit equations, which are, utilised in modulating of the SMCs operated under phase disposition phase shifted carrier pulse width modulation (PD-PSC-PWM) technique whereas being initiated from the Kepler's transcendental equation, are derived. Next, utilising above-mentioned calculated Kapteyn (Fourier-Bessel)-based infinite series, a time-variant differential equation-based analytical model for single/three-phase SMCs is suggested. This strategy reduces to a model that can facilitate the analytic investigation of the start-up behaviour, dynamic response and natural voltage balancing phenomenon for SMCs owning any number of voltage-levels and phase numbers. Furthermore, it is also inferred that under the PD-PSC-PWM modulation technique, the flying-capacitor (FC) voltages balance naturally for higher number of stacks and cells, hence substantiating that the natural balancing exists for high-level SMCs. Moreover, precise analysis of the experimental observations reveals that settling time of the FC voltages in the positive and negative stacks positioned in the immediate vicinity of the SMC's midpoint is higher than the settling time of the FC voltages in the correspondent positive and negative stacks outlying the SMC's midpoint.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flying‐capacitor stacked multicell multilevel voltage source inverters: analysis and modelling

Dargahi

Babaei

Eskandari

et al. 2014

IET Power Electronics

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“…renewable energy integrations to the electric power grid, hydro pumped storage, wind energy conversion, and railway traction [1][2][3].In comparison with the classic two-level power converters, the most noteworthy advantages of multilevel converters can be indicated as follows: a significant enhancement to the synthesized voltage/current waveforms from the harmonic content point of view, reduced voltage/current rating of the embedded semiconductor power switches, increased reliance on the converter operation owing to the features such as fault tolerance, decreased switching losses, enhanced efficiency, reduced amount of output dv/dt or di/dt stresses, lowered electromagnetic interference, and output filter inductance, etc. [4][5][6][7][8].The most common multilevel converter topologies are the neutral point clamped (NPC) converters, cascaded H-bridge (CHB) converters, flying capacitor (FC) converters, and their hybrid topologies [9][10][11][12].The first NPC pulse width modulation (PWM) converter, also named as the diode-clamped converter, was presented by Nabae et al in 1981. The NPC converters use a serial connection of capacitors at the common dc link with an intention to divide its voltage into different levels.…”

mentioning

confidence: 99%

“…The significant feature of the proposed configuration is reduction in the number of required high-frequency power switches that result in decreasing the size and cost of the circuit [8]. Sadigh et al have proposed a new asymmetrical CM converter based on optimized symmetrical sub-multilevel modules resulting a significant reduction in the number of required high-frequency power switches and associated driver circuits that imply cost, weight, and installation area enhancements to CHB converters [4].Other significant topologies of multilevel converters are FC multicell converters (FCMCs) and their sub-topologies stacked multicell converters (SMCs) [11,12,22]. These converters are based on the interconnection of cell units which consists of a FC and a pair of semiconductor switches with a complementary state [23].…”

mentioning

confidence: 99%

Elimination of DC voltage sources and reduction of power switches voltage stress in stacked multicell converters: analysis, modeling, and implementation

Vahidinasab

Abarzadeh

Sadigh

et al. 2013

Int. Trans. Electr. Energ. Syst.

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SUMMARYMultilevel converters have been widely used in medium-voltage high-power applications. One of the typical breeds of multicell converters is stacked multicell converter (SMC). This paper presents an improved configuration for SMCs, accompanied by its analysis, modeling, and implementation. The main advantages of the proposed converter, in comparison with the conventional one, are that the numbers of required dc voltage sources are halved in the improved topology and also the voltage rating of half of the power switches are decreased by 50% which results in reducing the cost, size, and weight of the SMCs effectively. This progress is achieved by connecting the upper stacks to the lower stacks back to back while the number of high-frequency power switches and flying capacitors (FCs), voltage ratings of FCs, as well as the number of high-frequency switchings during a full cycle are kept constant. The control methodology is based on the phase-shifted carrier sinusoidal pulse width modulation technique; therefore, the well-known natural balancing phenomenon of FC voltages, one of the critical advantages of SMCs, is maintained in the proposed converter. This paper also presents an analytic model to study and analyze the dynamic of FC voltages in the proposed SMC. Numerical analysis results of the derived analytic model, simulation results, and, moreover, measurements taken from the laboratory prototypes are presented in order to validate the effectiveness and advantages of the proposed configuration as well as its control strategy and analytic model. In addition, the comparison of the proposed converter with other types of multilevel converters is carried out to highlight the advantages of the proposed structure.

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Developed configuration of stacked multicell topology with reduced DC voltage sources

Hazrati

Sharifian

Feyzi

et al. 2021

Circuit Theory & Apps

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Multilevel inverters are considered as a suitable alternative for the two-level topology in the medium-voltage, high-power applications because of the higher number of voltage levels, and, as a result, reduced harmonic distortion. One of the most critical types of multilevel inverters is the flying capacitor topology, in which the stacked multicell topology is derived from this type of multilevel inverters. This paper presents a developed configuration of the stacked multicell topology, constructed from 2m Â n primary commutation cells, which generates the output voltage of (2m Â n)+1 levels. The most crucial point in the flying capacitor-based topologies is balancing the flying capacitors' voltages, which is the primary condition of these topologies' correct operation. Also, in this topology, the number of required DC voltage sources is decreased compared to the existing multicell topology. Moreover, the developed topology can generate a higher number of voltage levels without cascading several cells. The developed multicell inverter topology is controlled based on the disposition band carrier and phase-shifted carrier sinusoidal pulse width modulation (DBC-PSC-SPWM) method. Because of this control method, the voltages of capacitors are self-adjusted at their value. The proposed topology is simulated in different conditions using PSCAD/EMTDC software and to show the validity of the proposed topology and the control method, and simulation results are demonstrated. A laboratory-type experimental setup is used to validate the modulation strategy and other findings.disposition band carrier pulse width modulation, multilevel inverter, phase-shifted carrier sinusoidal pulse width modulation, self-voltage balancing, stacked multicell

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DC (direct current) voltage source reduction in stacked multicell converter based energy systems

Cited by 29 publications

References 38 publications

Flying‐capacitor stacked multicell multilevel voltage source inverters: analysis and modelling

Flying‐capacitor stacked multicell multilevel voltage source inverters: analysis and modelling

Elimination of DC voltage sources and reduction of power switches voltage stress in stacked multicell converters: analysis, modeling, and implementation

Developed configuration of stacked multicell topology with reduced DC voltage sources

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