Selective Harmonic Elimination Based on Newton-raphson Method for Cascaded H-bridge Multilevel Inverter

2017 ◽  
Vol 8 (3) ◽  
pp. 1193
Author(s):  
Wahidah Abd Halim ◽  
Tengku Noor Ariana Tengku Azam ◽  
Komathi Applasamy ◽  
Auzani Jidin
Keyword(s):  
Single Phase ◽  
Power Converter ◽  
Multilevel Inverter ◽  
Multilevel Inverters ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Field Programmable ◽  
Newton Raphson ◽  
Harmonic Components ◽  
Raphson Method

<span lang="EN-US">Multilevel inverters are emerging as the new breed of power converter options for high power applications. They typically synthesis the staircase voltage waveform (from several dc sources) which reduced harmonic content. This paper presents a simple selective harmonic elimination (SHE) modulation for single-phase cascaded H-bridge (CHB) multilevel inverter. The optimum switching angle of the transcendental equations describing the fundamental and harmonic components is solved by means of the Newton-Raphson (NR) method. The proposed SHE scheme is performed through simulation using MATLAB/Simulink. This simulation results are then verified through experiment using Altera DE0-Nano field-programmable gate array (FPGA). The proposed SHE is efficient in eliminating the lowest-order harmonics and producing a higher quality output waveform with a better harmonic profile.  </span>

Selective Harmonic Elimination Method for Cascaded H-Bridge Multilevel Inverter

2015 ◽  
Vol 785 ◽  
pp. 122-126
Author(s):  
Wahidah Abd Halim ◽  
Nasrudin Abd Rahim
Keyword(s):  
Harmonic Distortion ◽  
Logic Gates ◽  
Multilevel Inverter ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Field Programmable ◽  
Specific Order ◽  
Simple Implementation ◽  
The Relationship ◽  
Raphson Method

This paper presents a selective harmonic elimination (SHE) modulation technique for cascaded H-bridge (CHB) multilevel inverter. The main advantage of the proposed SHE concept is its simple implementation to eliminate the specific order harmonics. The procedures used to achieve the appropriate switching angles are presented. The switching angles are offline computed using the Newton-Raphson method. The SHE scheme of the adopted inverter uses the relationship between the angles and a sinusoidal reference waveform through some combinational logic gates. Theoretical results are verified by the experimental work of a single-phase 7-level CHB inverter employing an Altera DE2 field-programmable gate array (FPGA). Results show the inverter producing an optimum stepped output voltage when selected low-order harmonics are eliminated and the voltage total harmonic distortion (THD) is improved.

scholarly journals Switching Angles Optimization of Cascaded Multilevel Inverter with Newton-Raphson Methhod

2018 ◽  
Author(s):  
Asnil ◽  
krismadinata ◽  
Irma Husnaini ◽  
Syahril
Keyword(s):  
Single Phase ◽  
Higher Order ◽  
Multilevel Inverter ◽  
Output Waveform ◽  
Harmonic Elimination ◽  
Newton Raphson ◽  
Cascaded Multilevel Inverter ◽  
Raphson Method

This paper recounts an approach to optrmize the switching angles or single-phase live-level cascaded H-bridgc multilevel inverter. Optimized Harmonic Elimination Stepped Waveform (OHESW) technique was engaged to enhance the output waveform quality. Newtcn-Raphson method is employed to determine the switching angles for the inverter which eliminates specified higher order harmonics while maintaining the required fundamental voltage. Computation resulting from the optimized switching angle was simulated Its results indicated the proposed method's effectiveness

FPGA Based Selective Harmonic Elimination Technique for Multilevel Inverter

2018 ◽  
Vol 9 (1) ◽  
pp. 166 ◽  
Author(s):  
T. Porselvi ◽  
K. Deepa ◽  
R. Muthu
Keyword(s):  
Power Generation ◽  
Lower Order ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
New Technique ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Medium Range ◽  
Field Programmable ◽  
A New Technique

Harmonic elimination at the fundamental frequency is very much appropriate for high and medium range of power generation and applications. This paper considers a new technique for selective harmonic elimination (SHE), in which the total harmonic distortion (THD) is minimized when compared with that of the conventional one. With this technique, the harmonics at lower order are eliminated, which are more predominant than the higher ones.Cascaded H-Bridge inverter fed by a single DC is considered which is simulated with the switching angles generated by both the conventional method of SHE and the new method of SHE. The simulated results of the load voltage and the waveforms of the harmonic analysis are shown. The THD values are compared for the two techniques.  The experimental results are also shown for the new technique. The switching angles are generated with the help of field programmable gated array (FPGA) in the hardware. The value of experimental THD of voltage is compared with that of simulated THD and the comparison prove that the results are satisfactory.

scholarly journals Selective Harmonic Elimination in a Wide Modulation Range Using Modified Newton–Raphson and Pattern Generation Methods for a Multilevel Inverter

Energies ◽  
2018 ◽  
Vol 11 (2) ◽  
pp. 458 ◽  
Author(s):  
Mohammed Al-Hitmi ◽  
Salman Ahmad ◽  
Atif Iqbal ◽  
Sanjeevikumar Padmanaban ◽  
Imtiaz Ashraf
Keyword(s):  
Pattern Generation ◽  
Multilevel Inverter ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Newton Raphson

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

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

scholarly journals Swarm Optimization-Based Modified Selective Harmonic Elimination PWM Technique Application in Symmetrical H-Bridge Type Multilevel Inverters

2019 ◽  
Vol 9 (1) ◽  
pp. 3836-3845
Author(s):  
Y. Gopal ◽  
K. P. Panda ◽  
D. Birla ◽  
M. Lalwani
Keyword(s):  
Harmonic Distortion ◽  
Transcendental Equation ◽  
Multilevel Inverter ◽  
Swarm Optimization ◽  
Multilevel Inverters ◽  
Harmonic Elimination ◽  
New Variant ◽  
Selective Harmonic Elimination ◽  
Bridge Type ◽  
Circuit Components

The problem of elimination of harmonics and the need of a large number of switches in multilevel inverters (MLIs) have been a hot topic of research over the last decades. In this paper, a new variant swarm optimization (SO) based selective harmonic elimination (SHE) technique is described to minimize harmonics in MLIs, which is a complex optimization problem involving non-linear transcendental equation. Optimum switching angles are calculated by the proposed algorithms considering minimum total harmonic distortion (THD) and the best results are taken for controlling the operation of MLIs. The performance of the proposed algorithm is compared with the genetic algorithm (GA). Conventional MLIs have some disadvantages such as the requirement of a large number of circuit components, complex control, and voltage balancing problems. A novel seven-level reduced switch multilevel inverter (RS MLI) is proposed in this paper to recoup the need of a large number of switches. Matlab/Simulink software is used for the simulation of two symmetrical topologies, i.e., a seven-level cascaded H-bridge multilevel inverter (CHB MLI) and a seven-level (RS MLI). Simulation results are validated by developing a prototype of both MLIs. The enhancement of the output voltage waveform confirms the effectiveness of the proposed SO SHE approach.

scholarly journals A modified cascaded h-bridge multilevel inverter based on particle swarm optimisation (PSO) technique

2019 ◽  
Vol 16 (1) ◽  
pp. 41
Author(s):  
Mohammed Rasheed ◽  
Rosli Omar ◽  
Marizan Sulaiman ◽  
Wahidah Abd Halim
Keyword(s):  
Output Voltage ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Linear Equations ◽  
Harmonic Distortion ◽  
Particle Swarm ◽  
Multilevel Inverter ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Non Linear Equations

<span>In this paper, modified multilevel inverter, via addition of an auxiliary bidirectional switch, based on Newton Raphson (NR) and Particle Swarm Optimization (PSO) techniques is presented. The NR and PSO techniques were employed for selective harmonics elimination (SHE) solution in a modified Cascaded H Bridge Multilevel inverter (CHB-MLI). The Selective Harmonic Elimination Pulse-Width Modulation (SHE-PWM) is a powerful technique for harmonic minimization in multilevel inverter. The NR and PSO techniques were used to determine the switching angles by solving the non-linear equations of the output voltage waveform of the modified CHB-MLI in order to control the fundamental component and eliminate some low order harmonics. The proposed NR and PSO techniques are capable to minimize the Total Harmonic Distortion (THD) of the output voltage of the modified inverter within allowable limits. This paper aims to modeling and simulation by MATLAB of the modified topology of the CHB-MLI for a single-phase prototype for 13-levels. The inverter offers less THD and greater efficiency using PSO control algorithm compared with the NR algorithm. <br https://server9.kproxy.com/servlet/redirect.srv/sruj/snbzofspy/skvyzff/p1/> The performance of the proposed controllers based on NR and PSO techniques is verified through simulation.</span>

scholarly journals Enhance the accuracy of control algorithm for multilevel inverter based on artificial neural network

2020 ◽  
Vol 20 (3) ◽  
pp. 1148
Author(s):  
Mohammed Rasheed ◽  
Moataz M. A. Alakkad ◽  
Rosli Omar ◽  
Marizan Sulaiman ◽  
Wahidah Abd Halim
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Real Time ◽  
Optimization Technique ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Multilevel Inverters ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Artificial Neural

<p>In converters or multilevel inverters it is very important to ensure that the output of the<br />multilevel inverters waveforms in term of the voltage or current of the waveforms is<br />smooth and without distortion. The artificial neural network (ANN) technique to<br />obtaining proper switching angles sequences for a uniform step asymmetrical modified<br />multilevel inverter by eliminating specified higher-order harmonics while maintaining<br />the required fundamental voltage and current waveform. However, through this paper a<br />modified CHB-MLI are proposed using artificial intelligence optimization technique<br />based on modulation Selective Harmonic Elimination (SHE-PWM). A most powerful<br />modulation technique that used to minimize a harmonic contants during the outout<br />waveform of multilevel inverter is a SHE-PWM method. The proposed a five-level<br />Modified Cascaded H-Bridge Multilevel Inverter (M-CHBMI) with ANN controller to<br />improve the output voltage and current performance and achieve a lower Total<br />Harmonic Distortion (THD). The main aims of this paper cover design, modeling,<br />prediction for real-time generation of optimal switching angles in a single-phase<br />topology of modified five level CHB-MLI. due to the heavy cost of computation to<br />solving transcendental nonlinear equations with specified number, a real-time<br />application of Selective Harmonic Elimination-Pulse Width Modulation (SHE-PWM)<br />technique is limited. SHE equations known as a transcendental nonlinear equation that<br />contain trigonometric functions. The prototype of a 5-level inverter in Digital Signal<br />Processing (DSP) TMS320F2812 reveals that the proposed method is highly efficient<br />for harmonic reduction in modified multilevel inverter.</p>

scholarly journals Harmonic minimization of a single-phase asymmetrical TCHB multilevel inverter based on nearest level control method

2020 ◽  
Vol 11 (3) ◽  
pp. 1406
Author(s):  
Wail Ali Ali Saleh ◽  
Nurul Ain Mohd Said ◽  
Wahidah Abd Halim
Keyword(s):  
Single Phase ◽  
Control Method ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Level Control ◽  
Electronic Components ◽  
High Quality ◽  
Multilevel Inverters ◽  
Switching Losses ◽  
Field Programmable

Multilevel inverters are gaining special interest among researchers and in the industry due to their widespread applications and numerous merits. Obtaining high quality, more reliable output while using a reduced number of electronic components is the main purpose of most of the research conducted in this area of study. The purpose of this study is to apply the nearest level control (NLC) method to a 13-level transistor-clamped H-bridge (TCHB) inverter with unequal DC voltage supplies. The NLC method operates at the fundamental frequency, thus reducing switching losses, and can reduce the harmonic content significantly. The adopted multilevel inverter consists of two TCHB cells supplied with two asymmetrical DC input sources with a voltage ratio of 1:2. This structure reduces the number of electronic components, and the asymmetry in the DC input voltages results in a higher number of levels. The adopted topology and its proposed control method were simulated in Matlab/Simulink, and the simulation results were verified through experiments using an Altera field-programmable gate array (FPGA) board. The results showed that the topology and its control method are efficient in obtaining a high-quality output with an improved total harmonic distortion (THD).

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