An optimal selective harmonic mitigation technique for high power converters

Marzoughi, Alinaghi; Iman‐Eini, Hossein; Moeini, Amirhossein

doi:10.1016/j.ijepes.2012.12.007

Cited by 71 publications

(38 citation statements)

References 12 publications

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“…A high number of switching transitions provides more flexibility for manipulation of the harmonic properties of the generated voltages, although it also nullifies the low frequency switching advantage that comes inherently with SHE-PWM, resulting in increased switching power losses. Furthermore, it leads to a large-scale system of equations that needs to be solved for finding the switching angles, resulting in increased calculation complexity [38][39][40][41].…”

Section: Selective Harmonic Eliminationmentioning

confidence: 99%

A New Fault-Tolerant Strategy Based on a Modified Selective Harmonic Technique for Three-Phase Multilevel Converters With a Single Faulty Cell

Aleenejad

Mahmoudi

Moamaei

et al. 2016

IEEE Trans. Power Electron.

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This paper proposes a new fault-tolerant strategy to revamp performance of three phase multilevel converters with a single faulty switch. The proposed faulttolerant strategy is based on application of a modified Selective Harmonic Elimination (SHE) technique in conjunction with the Fundamental Phase-Shift Compensation (FPSC) method. The proposed faulttolerant strategy makes the most use of converter capacity in the faulty condition, generates balanced line voltages, and eliminates a wide range of lower order harmonics to limit the Total Harmonic Distribution (THD) of the converter voltages in the faulty condition. In this paper, first a brief background about Cascaded H-bridge (CHB) multilevel converters and SHE technique is provided. Then the proposed fault-tolerant strategy and the modified SHE technique are presented. Finally, several experimental results are provided to validate the operation of the proposed strategy. . His research interests include modeling, design and control of power electronic converters, electricdrive vehicles and solar energy systems.

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Section: Selective Harmonic Eliminationmentioning

confidence: 99%

A New Fault-Tolerant Strategy Based on a Modified Selective Harmonic Technique for Three-Phase Multilevel Converters With a Single Faulty Cell

Aleenejad

Mahmoudi

Moamaei

et al. 2016

IEEE Trans. Power Electron.

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“…In this paper, the heuristic Particle Swarm Optimization (PSO) technique is employed. This technique has been used in several optimal modulation techniques [12], [19], [30]- [32], [34] and shows superior characteristics in comparison with other heuristic optimization methods such as Genetic Algorithm, Simulated Annealing, etc. The obtained solutions of the equations are shown in Fig.…”

Section: B Applying the Proposed Methods In Three-phase Structuresmentioning

confidence: 99%

“…In this paper, four power quality standards (EN 50160 [4], CIGRE WG 36-05 [5], IEC 61000-3-6 [6], and IEC 61000-2-12 [7]) are considered for the proposed SHM-PWM method. The selected grid codes in this paper are more intransigent than those in previous works [12], [17], [23], [24]. Moreover, IEC 61000-3-6 and IEC 61000-2-12 are known as international power quality standards.…”

Section: ) Selective Harmonic Elimination-pwm (She-pwm) 2) Selectivmentioning

confidence: 97%

“…Hence, smaller and cheaper passive filters can be adopted in this method. The main goals in this method are increasing the converter efficiency by decreasing the switching frequency [25], [12], satisfying a larger number of grid codes [12], and analyzing the effect of DC link variations in the harmonic spectra [26].…”

Section: ) Selective Harmonic Elimination-pwm (She-pwm) 2) Selectivmentioning

confidence: 99%

“…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%

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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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An improved SHM‐PWM scheme for three‐phase seven‐level CHB inverter to improve power quality by fulfilling CIGRE WG 36‐05 and EN 50160 and sharing equal power between the H‐bridge cells

Kundu

Banerjee

2019

Int Trans Electr Energ Syst

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Summary This paper presents an improved selective harmonic minimization (SHM)‐pulse width modulation (PWM) scheme using three‐phase seven‐level cascaded H‐bridge (CHB) inverter suitable for medium‐voltage distribution systems by achieving high‐quality voltage waveform with least number of switching instances (ie, each power semiconductor devices switched once in a quarter period). Here, each isolated DC voltage sources have been taken as variable and unequal for the CHB inverter. The efficacy of the proposed SHM‐PWM scheme over selective harmonic elimination (SHE)‐PWM scheme and existing SHM‐PWM scheme has been verified through a comparative inverter performance analysis with equal number of switching instances. Both simulation and experimental results prove that the proposed SHM‐PWM scheme ensures equal percentage of power‐sharing between the H‐bridge cells, achieves desired fundamental voltage component, minimizes each individual odd nontriplen harmonics, and limits %total harmonic distortion (THD) up to 25th‐order harmonics such that, it satisfies the power quality standards CIGRE WG 36‐05 and EN 50160 for the entire modulation index range. It is also seen that the proposed scheme requires least no of switching (three) than other reported SHE‐/SHM‐PWM schemes to meet the aforesaid power quality standards. It also results lower inverter losses and improves efficiency compared with conventional schemes. Finally, the scheme is applied to a closed‐loop control of induction motor driven by back‐to‐back PWM‐controlled converter.

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An optimal selective harmonic mitigation technique for high power converters

Cited by 71 publications

References 12 publications

A New Fault-Tolerant Strategy Based on a Modified Selective Harmonic Technique for Three-Phase Multilevel Converters With a Single Faulty Cell

A New Fault-Tolerant Strategy Based on a Modified Selective Harmonic Technique for Three-Phase Multilevel Converters With a Single Faulty Cell

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

An improved SHM‐PWM scheme for three‐phase seven‐level CHB inverter to improve power quality by fulfilling CIGRE WG 36‐05 and EN 50160 and sharing equal power between the H‐bridge cells

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