The advantages of harmonic-distortion minimization over traditional harmonic-elimination techniques

2002 ◽  
Author(s):  
D.A. Deib ◽  
H.W.Jr. Hill
Keyword(s):  
Harmonic Distortion ◽  
Harmonic Elimination ◽  
Distortion Minimization

scholarly journals Improved Backstepping Control of a DFIG based Wind Energy Conversion System using Ant Lion Optimizer Algorithm

2021 ◽  
Author(s):  
Zoubir Zeghdi ◽  
Linda Barazane ◽  
Youcef Bekakra ◽  
Abdelkader Larabi
Keyword(s):  
Fitness Function ◽  
Harmonic Distortion ◽  
Absolute Error ◽  
Optimization Method ◽  
Backstepping Control ◽  
Ant Lion Optimizer ◽  
Integral Time ◽  
Distortion Minimization ◽  
Ant Lion ◽  
Doubly Fed

In this paper, an improved Backstepping control based on a recent optimization method called Ant Lion Optimizer (ALO) algorithm for a Doubly Fed Induction Generator (DFIG) driven by a wind turbine is designed and presented. ALO algorithm is applied for obtaining optimum Backstepping control (BCS) parameters that are able to make the drive more robust with a faster dynamic response, higher accuracy and steady performance. The fitness function of the ALO algorithm to be minimized is designed using some indexes criterion like Integral Time Absolute Error (ITAE) and Integral Time Square Error (ITSE). Simulation tests are carried out in MATLAB/Simulink environment to validate the effectiveness of the proposed BCS-ALO and compared to the conventional BCS control. The results prove that the objectives of this paper were accomplished in terms of robustness, better dynamic efficiency, reduced harmonic distortion, minimization of stator powers ripples and performing well in solving the problem of uncertainty of the model parameter.

scholarly journals Multi-Pulse SCR Rectifiers

2021 ◽  
Author(s):  
Mei Li
Keyword(s):  
Experimental Verification ◽  
Current Source ◽  
Harmonic Distortion ◽  
Motor Drives ◽  
Line Current ◽  
High Voltage Direct Current ◽  
Battery Chargers ◽  
Power Battery ◽  
Harmonic Elimination ◽  
Three Phase

This thesis presents the introduction, analysis and experimental verification of the six-pulse SCR rectifier and multi-pulse SCR rectifiers. As a fundamental three-phase controllable ac-dc converter, the six-pulse SCR rectifier is widely used in industry. However, it generates high Total Harmonic Distortion (THD) in the line current. One of the solutions is to use multi-pulse rectifiers. Multi-pulse rectifiers could be classified into the 12-, 18-, and 24-pulse configurations. Application examples include high voltage direct current transmission systems, high power battery chargers and load commutated current source inverter powered motor drives. In this thesis, the six-, 12-, 18- and 24-pulse SCR rectifiers with inductive and capacitive loads are introduced. The line current THD and the input PF of various rectifiers are investigated. The principle of the harmonic elimination through phase-shifting transforms is analyzed by Fourer analysis and positive/negative sequence analysis. The experimental verification is accomplished on a prototype of the 12-pulse SCR recitifier.

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 Quality Enhancement of AC Chopper Using Genetic Algorithm

2015 ◽  
Vol 16 (1) ◽  
pp. 30
Author(s):  
S. Mahendran ◽  
Gnanambal I ◽  
Maheswari A
Keyword(s):  
Genetic Algorithm ◽  
Output Voltage ◽  
Fitness Function ◽  
Harmonic Distortion ◽  
Simulink Model ◽  
Harmonic Elimination ◽  
Global Optima ◽  
Genetic Algorithm Approach ◽  
Newton Raphson ◽  
Raphson Method

This paper mainly deals with the design of AC chopper using Genetic Algorithm based harmonic elimination technique. Genetic Algorithm is used to calculate optimum switching angles to eliminate lower order harmonics in the output voltage. Total Harmonic Distortion of output voltage is calculated from the obtained switching angles and also adopted in the proposed fitness function. Comparative analysis is made for the switching angles obtained by the Newton Raphson method and the proposed Genetic Algorithm. The analysis reveals that the proposed technique is on par with conventional method. Additionally, the Genetic Algorithm approach offers less computational burden, guaranteed global optima in most cases and faster convergence. The proposed method is simulated in Matlab/Simulink model and the results shows that the proposed method works with high effectiveness, accuracy and rapidity.

scholarly journals Selective Harmonic Elimination Based THD Minimization of a Symmetric 9-Level Inverter Using Ant Colony Optimization

2021 ◽  
Vol 8 (5) ◽  
pp. 769-774
Author(s):  
Neerudi Bhoopal ◽  
Dokku Sivanaga Malleswara Rao ◽  
Bharath Kumar Narukullapati ◽  
Idamakanti Kasireddy ◽  
Devineni Gireesh Kumar
Keyword(s):  
Ant Colony Optimization ◽  
Single Phase ◽  
Frequency Control ◽  
Harmonic Distortion ◽  
Low Frequency ◽  
Ant Colony ◽  
Medium Voltage ◽  
Semiconductor Switches ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination

This paper proposed a new topology of a symmetric single-phase multilevel inverter with the smaller number of semiconductor switches and optimized low-frequency control methods to optimize the Total Harmonic Distortion. A nine-level single phase output is obtained by eight number of active semiconductor switches, four diodes and four capacitors from two asymmetrical dc sources. The selected harmonic order in the output voltage is eliminated by the PWM (SHE-PWM) based on selective harmonic elimination. To optimize the switching angles, an ant colony optimization is introduced. The proposed SHE-PWM and ant optimization are implemented and tested for THD on the SIMULINK platform. The proposed approach offers less THD and is best suited to high-power applications with medium voltage.

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