Minimisation of total harmonic distortion in a cascaded multilevel inverter by regulating voltages of DC sources

Farokhnia, N.; Fathi, S. H.; Yousefpoor, Nima; Bakhshizadeh, Mohamadkazem

doi:10.1049/iet-pel.2011.0092

Cited by 89 publications

(58 citation statements)

References 25 publications

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“…Strictly speaking, a multilevel inverter provides higher number of levels in the output voltage waveforms. Basic types of these inverters include diode-clamped [10,11], flying capacitor [12,13], and cascaded H-bridge structures [14,15]. Such functionalities are introducing these inverters as qualified devices for medium-and high-power applications.…”

Section: Introductionmentioning

confidence: 99%

A simple unit cell structure for an efficient sketch of series‐connected multilevel inverters

Choupan

Nazarpour

Golshannavaz

2017

Circuit Theory & Apps

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This paper develops a simple design of unit cells to be taken in use in series-connected multilevel inverters. The proposed structure not only reduces the part counts efficiently but also increases the number of generated levels in the output voltage. By aggregating the cascaded series-connected units as the basic module, the proposed structure follows one H-bridge circuit. The basic module acts as the initial stage in direct current/alternative current conversion within which all the positive and zero levels are produced. Afterwards, the H-bridge circuit affords the production of symmetric sine-wave by realizing negative levels.To assure the expected operational objectives, we developed three different algorithms to determine the magnitude of input direct current voltage sources. Moreover, to further investigate the proposed structure, different switching algorithms such the fundamental switching frequency and pulse width modulation level shifting approaches are implemented and compared with each other. Extensive numerical and experimental studies are conducted to yield in a suitable evaluation platform. The obtained results demonstrate a superior performance of the proposed structure rather than the conventional topologies.depreciate the satisfactory performance of the proposed structure for low levels output voltages. For these cases, the THD content increases. This point is easily recognized in Figure 22. However, by increasing the number of levels, we obtained a more sinusoidal and clean waveform. Thus, a higher service quality is guaranteed. This in turn increases the count of power electronics devices and Figure 18. Experimental results for the proposed nine-level structure. (a) Basic module voltage (V o1 + V o2 ), (Time/div = 5 ms), and (Voltage/div = 2 V by 1:10 probe). (b) Sinusoidal output voltage waveform. (c) Output current waveform. [Colour figure can be viewed at wileyonlinelibrary.com]

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Section: Introductionmentioning

confidence: 99%

A simple unit cell structure for an efficient sketch of series‐connected multilevel inverters

Choupan

Nazarpour

Golshannavaz

2017

Circuit Theory & Apps

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“…The same method of integration was used in [3][4][5] for derivation of leg-to-leg (line-to-line) voltage THD values. Analysed waveforms are of square-wave shape rather than PWM.…”

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confidence: 99%

Analytical Formulas for Phase Voltage RMS Squared and THD in PWM Multiphase Systems

Dordevic

Jones

Levi

2015

IEEE Trans. Power Electron.

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“…It should be also noted that there are some papers that analysed THD of the multilevel inverters that are not operating in PWM mode, and where the output is of a quasi-square-wave form [1][2][3][4] -this is not of interest here. The case analysed in the paper is as in [5] where an analytical solution for the leg voltage THD and the weighted THD of the PWM multilevel inverter is given.…”

Section: Introductionmentioning

confidence: 99%

Analytical formula for leg voltage THD of a PWM multilevel inverter

Dordevic

Jones

Levi

2014

7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014)

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In this paper derivation of an analytical formula for the leg voltage THD is presented. The considered system is a leg of a multilevel pulse width modulated (PWM) voltage source inverter (VSI). The solution is based on the Parseval's theorem. The assumption throughout the derivations is that the ratio of the switching to the fundamental frequency is high. Derivations are based on the integration of the power of the PWM signal in a single switching period over the fundamental period of the signal. Only an ideal sinusoidal reference leg voltage is analysed. Analytical expression for the leg voltage THD is given for any number of levels. Validity of the derived analytical equations is confirmed by simulations and experiments.

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Minimisation of total harmonic distortion in a cascaded multilevel inverter by regulating voltages of DC sources

Cited by 89 publications

References 25 publications

A simple unit cell structure for an efficient sketch of series‐connected multilevel inverters

A simple unit cell structure for an efficient sketch of series‐connected multilevel inverters

Analytical Formulas for Phase Voltage RMS Squared and THD in PWM Multiphase Systems

Analytical formula for leg voltage THD of a PWM multilevel inverter

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