Comparison of different third harmonic injected PWM strategies for 5-level diode clamped inverter

Tamasas, Mohamed; Saleh, Mohamed; Shaker, Mahmoud; Hammoda, Ahmed

doi:10.1109/peci.2017.7935718

Cited by 7 publications

(4 citation statements)

References 5 publications

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“…In this paper, by using a remaining degree of freedom associated with the injection of homopolar component, some commutations are avoided compared to ICM1 presenting a second controller (ICM2) who explodes this capability. The output waveform of ICM2, as it will be shown later on in experiments, is similar to those approaches which inject a third harmonic signal into the output voltage to increase the fundamental signal range without overmodulating [37]. Therefore, ICM2 also has this property inherent without the need of extra computations.…”

Section: Introductionmentioning

confidence: 65%

Integrated Control and Modulation for Three-Level NPC Rectifiers

Ventosa‐Cutillas

Montero-Robina

Umbría³

et al. 2019

Energies

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This paper uses a novel approach for the control of three-level neutral-point-clamped (NPC) rectifiers in order to tackle the capacitor voltage balance problem. A distinctive feature of the new control approach is that it is based on a model which is written in terms of the duty ratios for each phase at each level. Hence, the system model presents nine duty cycle variables. Despite the fact that this formulation is different from the usual ones, it is shown that the control problem of currents and dc-link voltage can be formulated in a similar way to conventional methods. Furthermore, the control of the capacitor voltage balance can be expressed by means of equations that are decoupled from the currents and dc-link voltage dynamics, which results in a specific controller for the voltage balancing that does not affect the previous dynamics. A key point of the proposed approach is that part of the modulation stage is implicit in the formulation. Two particular controllers are compared in this paper. The first one fulfills the different control objectives at the expense of a large number of commutations. This problem is overcome in a new proposed controller, which presents similar performance and a satisfactory number of commutations. Experimental results are performed showing the effectiveness compared with a modified virtual space vector modulation with capacitor voltage balance capabilities.

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Section: Introductionmentioning

confidence: 65%

Integrated Control and Modulation for Three-Level NPC Rectifiers

Ventosa‐Cutillas

Montero-Robina

Umbría³

et al. 2019

Energies

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“…The third harmonic injected PWM (THIPWM) method uses a newly generated reference signal. This reference signal is achieved by injecting the third-order harmonic into the sinusoidal signal [48], [49].…”

Section: This Methods Is Known As Sinusoidal-spwm (S-spwm)mentioning

confidence: 99%

MC-SPWM and MC-THIPWM Methods for Symmetric and Asymmetric Design of CHB-MLI: A Study

Patel¹,

Sood²

2022

J. Engg. Res. & Sci.

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Cascaded H-bridge multilevel inverters (CHB-MLI) are employed in a variety of medium/high power applications. These inverters are known to inject unwanted harmonics into the grid, which negatively affects the grid and connected loads. CHB-MLI topology can reduce many of these harmonics by producing multiple output voltage levels and improves the fundamental component using a suitable modulation technique. However, the CHB-MLI topology configuration requires multiple isolated input sources which must be balanced either with the modulation technique or with an additional method. This paper analyzes multi-carrier pulse width modulation (MC-PWM) techniques for CHB-MLIs. In this study, two basic configurations of CHB-MLI symmetrical and asymmetrical are reviewed, followed by their mathematical analysis. Also, this paper analyses multicarrier based sinusoidal pulse width modulation (MC-SPWM) and multi-carrier based third-harmonic injected pulse width modulation (MC-THIPWM) techniques with phase-shifted (PS) and level-shifted (LS) carrier arrangements for the CHB-MLI. Moreover, a simulation study has been conducted using MATLAB Simulink to analyze the performance of MC-PWM techniques for the symmetrical and asymmetrical type CHB-MLIs. The 7-level and 9-level CHB-MLIs were evaluated for the stated MC-PWM techniques in terms of harmonics and fundamental components. In addition, discharging current of all input sources was checked to verify the ability of all MC-PWM techniques to balance all input sources.

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“…It can be seen that for M = 0.9, the fundamental wave amplitudes of U AN is 659.8 V, which is higher than that of 539.6 V in [19] by 22.28%. This breaks through the theoretical limit of 15% by injecting the third harmonics to increase U 1,M = 1 /E in [20].…”

Section: Simulation Analysis and Experimental Verificationmentioning

confidence: 99%

A new modulation strategy and power balance method of unsymmetrical CHB inverter

Gong

Zhang

Liu

et al. 2021

IET Renewable Power Gen

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There exist the problems of the low utilization rate of DC voltage, power imbalance and current backflow in the modulation process of traditional unsymmetrical cascaded units. In view of these, a pulse width modulation strategy with an improved trapezoidal wave as the modulation wave and its corresponding power balance method are proposed. First, through double Fourier analysis of the output line voltage, an appropriate sine coefficient δ is obtained. Second, the waveform of the modulation wave is determined according to δ. Third, through the simple logic operation of the initial driving signals of the switch transistors, the required switch driving signals are obtained, and the power balance of each unit with the same voltage level is realized. In order to verify the effectiveness of the strategy and the method, a simulation and experiment platform are built, and a large number of simulations and experiments are carried out. The results show that compared with the traditional sinusoidal modulation method, the utilization rate of DC voltage obtained by the method can be improved by 22.28% and compared with the trapezoidal wave modulation method, the waveform distortion coefficient of the output voltage can be significantly reduced, and the utilization rate of DC voltage can be further improved. Meanwhile, the power balance can be achieved within one voltage cycle and the phenomenon of current backflow is eliminated.

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Comparison of different third harmonic injected PWM strategies for 5-level diode clamped inverter

Cited by 7 publications

References 5 publications

Integrated Control and Modulation for Three-Level NPC Rectifiers

Integrated Control and Modulation for Three-Level NPC Rectifiers

MC-SPWM and MC-THIPWM Methods for Symmetric and Asymmetric Design of CHB-MLI: A Study

A new modulation strategy and power balance method of unsymmetrical CHB inverter

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