Optimal Modulation of Flying Capacitor and Stacked Multicell Converters Using a State Machine Decoder

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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“…th harmonic where h and f SW are the integer number and the switching frequency, respectively [22,26].…”

Section: Conventional Configuration Of An Smcmentioning

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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“…The multiple benefits are possible to achieve by combining the two technologies. The structures of multi-level converters are mainly in form of the neutral point clamped (NPC), the flying capacitor (FC) and the cascaded converters (Lu et al, 2010;McGrath et al, 2007;Watkins & Zhang, 2004).…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison of PWM Schemes of Dual-inverter FED Five-phase Motor Drives

Satiawan¹,

Citarsa²,

Wiryajati³

et al. 2014

IJTech

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The dual-inverter fed open-end winding configuration can be categorized as a new breed of multilevel converters. The structure is simple and offers a lot of advantages. However, the development of suitable PWM schemes is more complicated, due to the availability of a large number of switching states and existence of the multiple two-dimensional planes. An overview of attempts to develop suitable modulation techniques for the dual-inverter fed five-phase machine drives recognizes that progress has been made over the past few years. This paper presents a performance comparison of three PWM schemes of the dual-inverter fed five-phase, open-end winding motor drives. The quality of the phase output voltages are compared and the adequate analyses are provided. The simulation results show that the Carrier Based Phase Disposition (PD) PWM scheme enables generation of the most excellent output voltage among the three PWM schemes. The Total Harmonics Distortion (THD) of the output voltages generated by the carrier based PWM scheme reduces by 65% and 15% on average compared to the THD of the output voltages produced by the URS PWM scheme and the decomposition PWM scheme respectively.

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“…The dynamics of the converter slow down with different types of load conditions. Some references in [9], [11], [12], [14] proposed a balance booster to achieve fast voltage balance dynamic. This balance booster consists of a passive RLC filter, which introduces additional power losses.…”

Section: Introductionmentioning

confidence: 99%

Voltage balancing method using phase-shifted PWM for stacked multicell converters

Ghias

Pou

Agelidis

et al. 2013

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society

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Abstract-This paper proposes an active voltage balancing method for stacked multicell converters (SMC) using phaseshifted pulse-width modulation, which is easy to implement and extend to high number of levels. The proposed method balances the voltages of the capacitors by modifying the duty cycle of each switch of the SMC using a proportional controller. The crossed effect between capacitor currents and duty cycles is considered and is used for optimal capacitor voltage balance. The performance of the proposed voltage balancing method is verified by simulation for different operating conditions, such as unbalanced linear loads, non-linear loads and load transients.

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Optimal Modulation of Flying Capacitor and Stacked Multicell Converters Using a State Machine Decoder

Cited by 211 publications

References 6 publications

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

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

Performance Comparison of PWM Schemes of Dual-inverter FED Five-phase Motor Drives

Voltage balancing method using phase-shifted PWM for stacked multicell converters

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