Staircase Selective Harmonic Elimination in Multilevel Inverters to Achieve Wide Output Voltage Range

AbstractThis paper presents a univariate equation-based selective harmonic elimination-pulse-width modulation (USHE-PWM) method for cascaded H-bridge (CHB) multilevel inverters (MLIs). Using equal-area criteria, the selection of voltage rating of dc-links have been done. The output voltage is controlled by inserting switching notch at the centre of each level of output voltage. Instead of conventional transcendental SHE-PWM equations, all these calculations are accomplished using univariate equations. This simplifies the real-time implementation of the proposed method greatly, even for the MLI with a large number of levels. The USHE-PWM method can eliminate more harmonics compared with the conventional SHE-PWM methods. While controlling the output voltage, the harmonic pattern remains unaffected. The validity of the proposed method is confirmed by the simulation and experimental studies.

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Selective Harmonic Elimination PWM for Cascaded H-bridge Multilevel Inverter with Wide Output Voltage Range Using PSO Algorithm

2021 IEEE Texas Power and Energy Conference (TPEC) ◽

10.1109/tpec51183.2021.9384945 ◽

2021 ◽

Author(s):

Milad Sadoughi ◽

Ali Zakerian ◽

Amirhossein Pourdadashnia ◽

Mohammad Farhadi-Kangarlu

Keyword(s):

Output Voltage ◽

Pso Algorithm ◽

Multilevel Inverter ◽

Voltage Range ◽

Harmonic Elimination ◽

Selective Harmonic Elimination

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THD Analysis of Novel Envelop with a T type (E-T) Multilevel Inverter with reduced number of switches

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.c3927.098319 ◽

2019 ◽

Vol 8 (3) ◽

pp. 194-199

Keyword(s):

Genetic Algorithm ◽

Power Quality ◽

Output Voltage ◽

Good Choice ◽

Multilevel Inverter ◽

Multilevel Inverters ◽

Harmonic Elimination ◽

Selective Harmonic Elimination ◽

Different Types ◽

Optimum Firing

Multilevel inverters are a good choice for medium and low power applications. Multilevel inverters have found a wide place in the market for their good power quality output. This paper proposes a new Envelope with T type Novel Multilevel inverter with unequal sources and with reduced switch count. Working of the circuit is explained. Firing angle calculations are done using simple nested looping technique and later Genetic Algorithm is used to obtain optimum firing angles for Selective Harmonic Elimination technique and improve the THD of the output voltage. Comparison is made between different types of inverters. The proposed inverter can be used for speed control of drives

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A novel optimization harmonic elimination technique for cascaded multilevel inverter

Bulletin of Electrical Engineering and Informatics ◽

10.11591/eei.v8i2.1500 ◽

2019 ◽

Vol 8 (2) ◽

pp. 405-413 ◽

Cited By ~ 1

Author(s):

Ezzidin Hassan Aboadla ◽

Sheroz Khan ◽

Mohamed H. Habaebi ◽

Teddy Surya Gunawan ◽

Belal A. Hamida ◽

...

Keyword(s):

Output Voltage ◽

Printed Circuit Board ◽

Harmonic Distortion ◽

Total Harmonic Distortion ◽

Circuit Board ◽

Multilevel Inverters ◽

Harmonic Elimination ◽

Selective Harmonic Elimination ◽

Voltage Signal ◽

Cascaded Multilevel Inverter

The main goal of utilizing Selective Harmonic Elimination (SHE) techniques in Multilevel Inverters (MLI) is to produce a high-quality output voltage signal with a minimum Total Harmonic Distortion (THD). By calculating N switching angles, SHE technique can eliminate (N-1) low order odd harmonics of the output voltage waveform. To optimized and obtained these switching angles, N of nonlinear equations should be solved using a numerical method. Modulation index (m) and duty cycle play a big role in selective harmonic elimination technique to obtain a minimum harmonic distortion and desired fundamental component voltage. In this paper, a novel Optimization Harmonic Elimination Technique (OHET) based on SHE scheme is proposed to re-mitigate Total Harmonic Distortion. The performance of seven-level H-bridge cascade inverter is evaluated using PSIM and validated experimentally by developing a purposely built microcontroller-based printed circuit board.

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