A Novel Approach to Generate Effective Carrier-Based Pulsewidth Modulation Strategies for Diode-Clamped Multilevel DC–AC Converters

Maheshwari, Ramkrishan; Busquets‐Monge, Sergio; Nicolás-Apruzzese, Joan

doi:10.1109/tie.2016.2538198

Cited by 39 publications

(14 citation statements)

References 29 publications

(40 reference statements)

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“…All the available redundant space vectors can be generated as (15). As redundant space vector selection is not the focus of this paper, we will not discuss this topic in detail here:…”

Section: Ntvs Determination and Duty Cycle Calculationmentioning

confidence: 99%

“…However, due to the existence of redundant space vectors and switching sequences, its implementation procedure is rather complex, especially for multilevel converters. For the purpose of simplifying this procedure, various methods have been put forward [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

“…The SPWM equivalence method [13][14][15][16][17] uses SPWM to achieve SVPWM by adding a common mode voltage to the modulation waves. However, for different modulation modes (including continuous and discontinuous modulation) and different switching sequences, the different common mode voltages are required.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fast and simple space vector modulation method for multilevel converters

Zhang

Meng

Ning

et al. 2020

IET Power Electronics

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This study proposes a simplified space vector pulse-width modulation (SVPWM) method for multilevel converters. To avoid unnecessary coordination transformations, firstly, a further derivation is conducted on the basis of the 60° coordinate transformation. Then, all the nearest three vectors (NTVs), duty cycles and optimal switching sequence within one switching period can be identified through a simple comparison of three-phase modulation waves. To further reduce the switching frequency, detailed steps to achieve the minimum number of transitions among different NTVs are constructed. Combined with the optimal switching sequence within one switching period, the minimum number of transitions within a fundamental period can be achieved easily. Finally, a thorough discussion is conducted to simplify the procedure further and the flowchart for the proposed SVPWM is also presented. Compared with the previous methods, the proposed method does not require any iterative calculation or coordinate transformation. To the best of the authors' knowledge, the calculation amount is reduced by almost seven times compared with the methods proposed. In addition, the switching frequency and total harmonic distortions remain at the same level without any deterioration. Finally, the simulation and experiment for modular multilevel converter are performed to verify the correctness and efficiency of the proposed method.

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“…All the available redundant space vectors can be generated as (15). As redundant space vector selection is not the focus of this paper, we will not discuss this topic in detail here:…”

Section: Ntvs Determination and Duty Cycle Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fast and simple space vector modulation method for multilevel converters

Zhang

Meng

Ning

et al. 2020

IET Power Electronics

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“…Vienna rectifiers can take advantage of the original 60° Flat-Top (DPWM1) waveforms as well [10]. Three-level NPC-type inverters can use similar discontinuous PWM methods to achieve lower current ripple and increased efficiency [11][12][13][14][15][16]. DPWM methods have also been considered with the goal of loss reduction in parallel interleaved converters [17], modular multilevel converters [18], cascaded H-bridge converters [19], and back-to-back converters [20], although the issue of increased current ripple on inductors and capacitors is problematic in certain applications.…”

Section: Introductionmentioning

confidence: 99%

Analytical compensation of harmonics caused by 60° flat‐top modulation

Futo

Varjasi

Vajk

et al. 2019

IET Power Electronics

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The 60° Flat-Top PWM modulation method (also called DPWM1, two-phase, or 60° bus-clamp) is widely used by the industry to reduce switching losses in three-phase inverters by connecting one of the three-phase legs to the positive or the negative DC rail continuously for 60°of the fundamental period. It is widely known that-compared to the most used SVM modulation-the Flat-Top modulation increases switching frequency current components. The actual amount is highly dependent on the modulation index. It is a lesser known fact that-at each switch-over happening at every 60°, because of the change of the phase in the switching frequency current component-low-order harmonics are produced as well. The effect of these can become especially significant, if one of the produced frequencies falls near to the resonant frequency of the LC or LCL filter. A modification of the original Flat-Top method has been developed, that corrects the duty ratios around the edges of the zero-sequence voltage signal. This way the filtered output voltage remains sinusoidal, while keeping the efficiency advantage of the Flat-Top. Experimental results on two different inverters show that the novel method significantly decreases the current THD. Fig. 1 Three-phase two-level VSI with low pass filter for grid connected or stand-alone operation. The filtering capacitors are shown in delta connection

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“…In recent years, several researchers have proposed advanced control techniques for NPC‐AFEs . Among these, finite‐control‐set model predictive control (FCS‐MPC) is an attractive candidate to ensure excellent performance in steady‐state operation.…”

Section: Introductionmentioning

confidence: 99%

A performance assessment of model predictive direct power control and model predictive direct current control for switched reluctance motor drive systems

Wang

2018

IEEJ Transactions Elec Engng

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In this paper, a performance assessment between model predictive direct power control and model predictive direct current control is proposed by using a simplified computational approach for switched reluctance motor drive systems. To reduce the calculation efforts, a reduced set of switching states is employed by combining the space vector modulation strategy with the dead-beat predictive control technique. Specifically, an optimal state of the reduced set of switching states is directly selected and applied in neutral point clamped active front-end rectifiers of switched reluctance motor drive systems. In comparison with the conventional method, the proposed scheme takes into account the 27 candidate switching states to 10. The number of admissible switching states is drastically reduced, which saves the execution time by up to 45% for model predictive direct power control and up to 56% for model predictive direct current control. The unwanted exploration for all available voltage vectors can be eliminated while the flying capacitor voltages are maintained balanced. Meanwhile, the use of the well-known modulation methods can be avoided by the proposed strategy, thus enhancing the dynamic performance. Simulation results obtained with the neutral point clamped active front-end rectifiers confirm the efficacy of two proposed methods.

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A Novel Approach to Generate Effective Carrier-Based Pulsewidth Modulation Strategies for Diode-Clamped Multilevel DC–AC Converters

Cited by 39 publications

References 29 publications

Fast and simple space vector modulation method for multilevel converters

Fast and simple space vector modulation method for multilevel converters

Analytical compensation of harmonics caused by 60° flat‐top modulation

A performance assessment of model predictive direct power control and model predictive direct current control for switched reluctance motor drive systems

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