Voltage Source Inverter Fed Drives

doi:10.1002/9781119156079.ch12

Cited by 3 publications

(3 citation statements)

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“…1, are one of the most popular multilevel topologies [2]. The three-level Neutral-Point-Clamped converters (3L-NPCs) are usually either fed with a single DC source or two isolated ones [3]. The single DC source requires Neutral-Point (NP) voltage balancing control, which can be achieved by hardware solutions [4] [5] or software (modulation schemes) [6]- [10].…”

Section: Introductionmentioning

confidence: 99%

“…The single DC source requires Neutral-Point (NP) voltage balancing control, which can be achieved by hardware solutions [4] [5] or software (modulation schemes) [6]- [10]. An alternative practical approach to the Neutral Point (NP) voltage balancing is the use of two separate DC sources, which can be realized by the 12-pulse diode-bridge rectifier, hence the Neutral Point (NP) voltage being balanced [3]. And such a configuration is used in high-power applications and is considered in this article.…”

Section: Introductionmentioning

confidence: 99%

“…In [21]- [23], research works attempt to lower output harmonic distortion by either utilizing the redundancy of switching patterns [21] or modifying the switching sequence [22] [23] with the help of Harmonic Distortion Factor [26]. Nevertheless, due to the nature of use of distant voltage vectors, the output harmonic distortion given by [21]- [23] is still significantly higher than the conventional Sinusoidal PWM, which makes use of three nearest voltage vectors [3]. It is also worth noting that the focus of research works in [21]- [23] is on the improvement of output harmonic distortion while leaving the Common-mode voltage (CMV) spikes undealt with.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Pulse-Width Modulation Strategy With Reduced High-Frequency Common-Mode Voltage to Lower RMS Motor Leakage Current for a Three-Level Neutral Point Clamped Converter

Pham,

Doi,

Nguyen

2023

IEEE Access

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Due to the capacitive nature of Common-mode impedance, high-frequency Common-mode voltage due to high switching frequency leads to an increase in RMS leakage current, which, in turn, causes higher power loss, Electromagnetic Interferences, and deteriorated harmonic distortion in the three-level Neutral-Point-Clamped converter. Recently-proposed pulse-width modulation type 1 with reduced Commonmode-voltage magnitudes, zero average Common-mode-voltage, and improved harmonic distortion has been presented for the three-level Neutral-Point-Clamped converter. However, the high-frequency Common-mode voltage could be further mitigated by reducing the number of CMV variations. Therefore, this article presents a hybrid pulse-width modulation scheme featuring reduced Common-mode-voltage magnitudes and variations, zero average Common-mode-voltage, and improved harmonic distortion. The Common-modevoltage variation reduction is realized by re-arranging the order of the switching states in the recentlyproposed scheme in a carrier period. The resulting modified sequences type 1 suffer simultaneous switchings between two phase-legs, hence leading to Common-mode-voltage spike due to deadtime. Hence, another type of modified sequences (type 2) is utilized with the modified sequences type 1 and the information of threephase currents, hence the term "hybrid". Results under Volt-per-Hertz-2.2KW-rated induction motor with different loading conditions in the Three-Level Neutral-Point-Clamped Converters indicate that at rated frequency of 50Hz, the proposed scheme leads to a noticeable decrease in RMS leakage current while producing similar-to-better harmonic distortion at the expense of slight reduction of the efficiency of a converter as opposed to the recently-proposed Reduced-Common-mode-voltage Pulse-width modulation type 1 with improved switching loss and Phase-Opposition-Disposition-Sinusoidal Pulse-width modulation.

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