Design and Implementation of GA Based Selective Harmonic Elimination in Modified Cascaded Multilevel Inverter

2014 ◽  
Vol 573 ◽  
pp. 3-6
Author(s):  
S. Dhayanandh ◽  
S. Manoharan
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Harmonic Spectrum ◽  
Multilevel Inverter ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Seventh Order ◽  
High Control ◽  
Power Application ◽  
Cascaded Multilevel Inverter

- The emergence of multilevel inverters has been in increase since the last decade. These new types of converters are suitable for high voltage and high power application due to their ability to synthesize waveforms with better harmonic spectrum. Numerous topologies have been introduced and widely studied for utility and induction billet applications. In this paper, proposed a Modified Multilevel Inverter (MMI) is eleven Levels. This proposed MMI consists of less number of switches to attain eleven levels when compared to the traditional cascaded multilevel inverter to attain the same level. As a result, voltage current stress across switches gets reduced, so that power loss gets reduced in the system. Secondly, an effective pulse width modulation (PWM) approach that can be utilized successfully with high control accuracy is combination of selective harmonic elimination and pulse width modulation (SHEPWM).This technique offers many advantages other PWM techniques including direct control over output waveform harmonics, and the ability to eliminate third, fifth and seventh order harmonics.

Selective harmonic elimination pulse width modulation for three-phase cascaded multilevel inverter

2021 ◽  
Author(s):  
Baharuddin Ismail ◽  
Muzamir Isa ◽  
M. Z. Aikhsan ◽  
M. N. K. H. Rohani ◽  
C. L. Wooi ◽  
...  
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Multilevel Inverter ◽  
Harmonic Elimination ◽  
Three Phase ◽  
Selective Harmonic Elimination ◽  
Cascaded Multilevel Inverter

scholarly journals A New Method of Selective Harmonic Elimination PWM for H-Bridge Cascaded Multilevel Inverter

2019 ◽  
Vol 9 (1) ◽  
pp. 6168-6175
Keyword(s):  
Degrees Of Freedom ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Voltage Range ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Cascaded Multilevel Inverter ◽  
Operating Points

The quality of power of the cascaded H-bridge multilevel inverter is affected due to harmonics. In this paper, a Selective Harmonic Elimination Pulse Width Modulation (SHE-PWM) method including controllable DC link voltage is introduced for the multilevel inverter. Novel mathematical modeling of SHE-PWM is established concerning the DC link voltage. Compared to ordinary selective harmonic elimination, the proposed method has an increased number of degrees of freedom because of its variable DC link voltage. On the other hand, the selective harmonic elimination utilizes constant DC link voltage. In the proposed scheme, the nonlinear equations are solved only once in the entire voltage range. As a result, the computational burden will decrease. Also, the Total Harmonic Distortion (THD) of the output voltage remains constant for various values of the operating points. The simulation is performed using Matlab Simulink and the comparison is performed with the conventional PWM method. It is intended that the proposed SHE-PWM based cascaded H-bridge multilevel inverter provides better performance in terms of lower-order harmonics and less THD compares to conventional PWM method.

Optimization-based open-loop selective harmonic elimination pulse width modulation for multilevel inverter flying capacitor voltage balance considering load power factor variation

2020 ◽  
pp. 095965182093934
Author(s):  
Faouzi Armi ◽  
Lazhar Manai ◽  
Mongi Besbes
Keyword(s):  
Power Factor ◽  
Control Strategy ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Open Loop ◽  
Multilevel Inverter ◽  
Load Power ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Capacitor Voltage

In this article, Newton–Raphson optimization-based selective harmonic elimination pulse width modulation is investigated for open-loop control of flying capacitor multilevel inverter. Proposed control strategy has allowed giving up current and voltage measurement instrumentations and sensors used in case of closed loop–based control. Proposed control strategy generates accurate switching angles, capable to balance flying capacitor voltage and eliminate lower order harmonics considering load power factor variation. Algorithm performances are verified by simulation and experiments, and obtained results prove that proposed technique does effectively eliminate specific harmonics and balance capacitor voltages while getting inverter output voltage with desired number of levels.

SELECTIVE HARMONIC ELIMINATION NON-SYMMETRICAL BIPOLAR PULSE WIDTH MODULATION TECHNIQUE: ANALYSIS AND EXPERIMENTAL VERIFICATION

2010 ◽  
Vol 19 (03) ◽  
pp. 719-731 ◽  
Author(s):  
MOHAMED S. A. DAHIDAH
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Harmonic Spectrum ◽  
Optimal Switching ◽  
Harmonic Elimination ◽  
Half Wave ◽  
Selective Harmonic Elimination ◽  
Quarter Wave ◽  
Fourier Theory ◽  
Power Electronic Converter

Selective harmonic elimination pulse width modulation (SHE-PWM) techniques offer a tight control of the harmonic spectrum of a given voltage waveform generated by a power electronic converter along with a low number of switching transitions. These optimal switching transitions can be calculated through Fourier theory, and for a number of years quarter-wave and half-wave symmetries have been assumed when formulating the problem. It is shown recently that symmetry requirements can be relaxed as a constraint. This changes the way the problem is formulated and different solutions can be found without a compromise. This paper reports solutions to the switching transitions of a bipolar SHE-PWM when both the quarter- and half-wave symmetries are abolished. Selected simulation and experimental results are reported to show the effectiveness of the proposed method.

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