On Attaining the Multiple Solutions of Selective Harmonic Elimination PWM Three-Level Waveforms Through Function Minimization

Agelidis, Vassilios G.; Balouktsis, A.; Cossar, C.

doi:10.1109/tie.2007.909728

Cited by 113 publications

(35 citation statements)

References 33 publications

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“…Summarizing, the SHEPWM technique for three-level converters [13] is based on solving the following system of equations where q is the highest harmonic order zeroed:…”

Section: A Three-level Convertersmentioning

confidence: 99%

Selective harmonic mitigation technique for multilevel cascaded H-bridge converters

Nápoles

Leon

Franquelo

et al. 2009

2009 35th Annual Conference of IEEE Industrial Electronics

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Abstract-The increasing demand of energy and proliferation of non-linear loads have leaded to the appearance of new grid codes which limit the maximum acceptable harmonic levels. In this context, multilevel topologies are very attractive because can generate output waveforms with a low harmonic content using a low switching frequency. In this paper, the recently presented selective harmonic mitigation technique (SHMPWM) is adapted to a nine-level converter. Its flexibility is exploited to meet the EN 50160 and CIGRE WG 36-05 grid codes without any additional filtering system using 10 switching angles per quarter of period in a wide range of amplitudes of the fundamental harmonic from 0.70 to 1.22. Some results validating this technique applied to this topology are presented. A comparison with the well known selective harmonic elimination method is included showing the advantages of the SHMPWM technique.

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“…Summarizing, the SHEPWM technique for three-level converters [13] is based on solving the following system of equations where q is the highest harmonic order zeroed:…”

Section: A Three-level Convertersmentioning

confidence: 99%

Selective harmonic mitigation technique for multilevel cascaded H-bridge converters

Nápoles

Leon

Franquelo

et al. 2009

2009 35th Annual Conference of IEEE Industrial Electronics

View full text Add to dashboard Cite

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“…On the other hand, grid connected converters have to satisfy power quality standards [4]- [7]. In order to meet standard requirements, different modulation techniques have been presented to reduce the harmonic contents of the output voltage and current [8]- [12].…”

Section: Introductionmentioning

confidence: 99%

Non-equal DC link Voltages in a Cascaded H-Bridge with a Selective Harmonic Mitigation-PWM Technique Based on the Fundamental Switching Frequency

Moeini¹,

Iman‐Eini²,

Najjar³

2017

Journal of Power Electronics

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In this paper, the Selective Harmonic Mitigation-PWM (SHM-PWM) method is used in single-phase and three-phase Cascaded H-Bridge (CHB) inverters in order to fulfill different power quality standards such as EN 50160, CIGRE WG 36-05, IEC 61000-3-6 and IEC 61000-2-12. Non-equal DC link voltages are used to increase the degrees of freedom for the proposed SHM-PWM technique. In addition, it will be shown that the obtained solutions become continuous and without sudden changes. As a result, the look-up tables can be significantly reduced. The proposed three-phase modulation method can mitigate up to the 50th harmonic from the output voltage, while each switch has just one switching in a fundamental period. In other words, the switching frequency of the power switches are limited to 50 Hz, which is the lowest switching frequency that can be achieved in the multilevel converters, when the optimal selective harmonic mitigation method is employed. In single-phase mode, the proposed method can successfully mitigate harmonics up to the 50th, where the switching frequency is 150 Hz. Finally, the validity of the proposed method is verified by simulations and experiments on a 9-level CHB inverter.

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“…After the formulation of such problems, a set of nonlinear equations, which are traditionally generated from a Fourier series representation and the objective function based on the specific perspective, should be solved before obtaining the desired switching angles [12], [13]. Thus, most SHE applications use solutions obtained from off-line calculations to reduce system complications [14]- [19]. SHE techniques decrease the dependence on passive filters when eliminating low frequency components because filters become prone to losses resulting from the internal resistance among filter components [20]- [23].…”

Section: Introductionmentioning

confidence: 99%

Selective Harmonic Elimination in Multi-level Inverters with Series-Connected Transformers with Equal Power Ratings

Moussa¹,

Dessouky²

2016

Journal of Power Electronics

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This study applies the selective harmonic elimination (SHE) technique to design and operate a regulated AC/DC/AC power supply suitable for maritime military applications and underground trains. The input is a single 50/60 Hz AC voltage, and the output is a 400 Hz regulated voltage. The switching angles for a multi-level inverter and transformer turns ratio are determined to operate with special connected transformers with equal power ratings and produce an almost sinusoidal current. As a result of its capability of directly controlling harmonics, the SHE technique is applicable to apparatus with congenital immunity to specific harmonics, such as series-connected transformers, which are specially designed to equally share the total load power. In the present work, a singlephase 50/60 Hz input source is rectified via a semi-controlled bridge rectifier to control DC voltage levels and thereby regulate the output load voltage at a constant level. The DC-rectified voltage then supplies six single-phase quazi-square H-bridge inverters, each of which supplies the primary of a single-phase transformer. The secondaries of the six transformers are connected in series. Through off-line calculation, the switching angles of the six inverters and the turns ratios of the six transformers are designed to ensure equal power distribution for the transformers. The SHE technique is also employed to eliminate the higher-order harmonics of the output voltage. A digital implementation is carried out to determine the switching angles. Theoretical results are demonstrated, and a scaled-down experimental 600 VA prototype is built to verify the validity of the proposed system.

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On Attaining the Multiple Solutions of Selective Harmonic Elimination PWM Three-Level Waveforms Through Function Minimization

Cited by 113 publications

References 33 publications

Selective harmonic mitigation technique for multilevel cascaded H-bridge converters

Selective harmonic mitigation technique for multilevel cascaded H-bridge converters

Non-equal DC link Voltages in a Cascaded H-Bridge with a Selective Harmonic Mitigation-PWM Technique Based on the Fundamental Switching Frequency

Selective Harmonic Elimination in Multi-level Inverters with Series-Connected Transformers with Equal Power Ratings

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