Analytic Method for the Computation of the Total Harmonic Distortion by the Cauchy Method of Residues

Blagouchine, Iaroslav V.; Moreau, Éric

doi:10.1109/tcomm.2011.061511.100749

Cited by 49 publications

(23 citation statements)

References 35 publications

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“…There are a few methods permitting to calculate THD factors. An analytic method for the THD computation by the Cauchy method of residues has been presented in [1]. It is evident that in order to decrease the THD factor of the stepped function it is necessary to develop more precisely formed steps of the function.…”

Section: T2-t3 T1-t 2 T 1 -T2 T2-t 3 T 3 -T4mentioning

confidence: 99%

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A three phase 3-level inverter with reduced THD factor

Iwaszkiewicz¹,

Muc²

2024

RE&PQJ

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The paper presents an mathematical analysis of a stepped function denoted as fN=6 . This function describes precisely an output voltage waveform of a 3-level inverter. The analysis proves that cascaded inverters give a very good performance of the output voltage according to a criterion of minimal THD. Optimal parameters are indicated in the paper. They permit to diminish the THD factor to a level below 21% while in standard NPC inverters such a result requires special treatment.

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Section: T2-t3 T1-t 2 T 1 -T2 T2-t 3 T 3 -T4mentioning

confidence: 99%

“…Taking into consideration (1) and introducing a function f(α,θ) the THD definition may be expressed as:…”

Section: Optimal Shape Of the Wave Form Fn=6mentioning

confidence: 99%

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A three phase 3-level inverter with reduced THD factor

Iwaszkiewicz¹,

Muc²

2024

RE&PQJ

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“…In the process of conversion of HVDC bus voltage into lower-level AC, the switch-mode converters create higher harmonics as unwanted byproduct. For full-bridge DC/ AC converter output voltage spectrum ( Figure 2) of THD is 0.483 or 48.3% [25]. To comply with THD limits, the simple DC/AC converters include the output filters reducing higher harmonics to the acceptable level.…”

Section: Full-bridge Module Operation and Spectrum Of The Output Voltagementioning

confidence: 99%

Sequential Selective Harmonic Elimination and Outphasing Amplitude Control for the Modular Multilevel Converters Operating with the Fundamental Frequency

Tyshko¹

2018

Power System Harmonics - Analysis, Effects and Mitigation Solutions for Power Quality Improvement

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With the growing use of DC voltage for power transmission (HVDC) and DC links for efficient AC motor drives, the R&D efforts are directed to the increase of DC/AC converter's efficiency and reliability. Commonly used DC/AC converters, based on the carrierfrequency pulse-width modulation (PWM) to form a sinusoidal output voltage with a low level of higher harmonics, have switching time and switching loss issues. The use of multimodule multilevel converters (MMC), operating with the fundamental switching frequency and phase-shift control to form the ladder-style output voltage, reduces switching losses to minimum while keeping the low level of higher harmonics in the output voltage. The discussed sequential harmonic elimination method for MMC, using identical power modules operating with 50% duty cycle and fundamental frequency, is based on the combination of the multiple fixed phase shifts to form a ladder-style sinusoidal voltage with low total harmonic distortion (THD) and symmetrical variable phase shifts to control the output voltage amplitude. The principles of the sequential selective harmonic elimination for MMC topology and amplitude control are described with two examples. The first example is the industrial-frequency DC/AC converter complying with THD requirements of IEEE 519 2014 standard without the output filter. The second example is a high-frequency converter, used as a transmitter, loaded with the resonant antenna, where the evaluation criteria are decreasing of the transmitter losses and increasing of the reliability or life expectancy at elevated temperature.

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“…and (8) Then the normalized impedance characteristic referred to the nominal load impedance is Design of filter elements is given in [7], harmonic distortion can be calculated using [8].…”

Section: Input Impedance and Voltage Transfer Characteristicsmentioning

confidence: 99%

Modelling of Dynamical Properties of a Resonant Converter under Step Frequence- and Loaded Converter Changes

Prazenica¹,

Kascak²,

Koscelnik³

et al. 2015

Proceedings of the 2015 International Conference on Modeling, Simulation and Applied Mathematics

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Paper deals with investigation of two problems: frequency step changes, and step switching-off of the load of LCTLC resonant inverter. Since the changes of frequency in the range from f min to f max are desirable to be the input current of the LCTLC circuit not greater than nominal one, the load changes cause dangerous overvoltage spikes. Modelling, theoretical analysis and computer simulation are used for the solution of those phenomena. Simulation experiment results confirming theoretical assumptions are given in the paper.

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Analytic Method for the Computation of the Total Harmonic Distortion by the Cauchy Method of Residues

Cited by 49 publications

References 35 publications

A three phase 3-level inverter with reduced THD factor

A three phase 3-level inverter with reduced THD factor

Sequential Selective Harmonic Elimination and Outphasing Amplitude Control for the Modular Multilevel Converters Operating with the Fundamental Frequency

Modelling of Dynamical Properties of a Resonant Converter under Step Frequence- and Loaded Converter Changes

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