scholarly journals 11-level Multilevel Inverter for Medium Voltage High Power ID and FD Fan Drives in Power Plant

2019 ◽  
Vol 9 (2) ◽  
pp. 1138-1141
Keyword(s):  
High Power ◽  
Electromagnetic Interference ◽  
Electronic Devices ◽  
Harmonic Distortion ◽  
Level Shift ◽  
Energy Integration ◽  
Renewable Energy Integration ◽  
Medium Voltage ◽  
Multilevel Inverters ◽  
Multi Level

Multi-level inverter technology has emerged recently as a very important alternative in the area of medium-voltage high-power energy control such as ID and FD fans which runs with the help of these megawatt power drives and renewable energy integration to grid such as solar energy integration which requires pure sinusoidal voltage with less than five percent THD to synchronize to grid. For the requirement of large voltage sources(DC) in number, reduced electromagnetic interference, utilization of power electronic devices having less voltage blocking capability, less percentage of total harmonic distortion in output voltage, reduced stress on insulation they are mostly used. Various topologies are used for multilevel inverters. Among them the most commonly used is cascaded H-bridge (multi-cell). A 3-phase 11-level reduced H-bridge topology is proposed and is controlled by level shift carrier PWM in this paper. The considered topology and controlled algorithm is implemented in MATLAB/SIMULINK. The simulation results show a reduction of THD to a greater extent which will be useful in renewable areas and mega watt power drives.

scholarly journals Performance Research of Seven Level Multi-Level Inverter with Reduced Switches using Various PWM Techniques

2019 ◽  
Vol 8 (2S8) ◽  
pp. 1149-1154
Keyword(s):  
High Power ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Switching Topology ◽  
Switching Loss ◽  
Medium Voltage ◽  
Switching Losses ◽  
Multi Level ◽  
Low Efficiency ◽  
Performance Research

A inverter is basically a device that usually converts DC to AC voltage without causing any power loss, applicable to only low to medium voltage applications. But in case of medium to high power applications, it has demerits like high switching losses, reduced cost and low efficiency. To overcome these demerits a Multilevel inverter applicable to high voltage and high-power applications which have low total harmonic distortion (THD) is introduced. This paper is mainly focused on seven-level inverter with five switches and four dc sources. with low total harmonic distortion, less switching loss without adding any complexity to the circuit. The switching topology is integrated with various SPWM techniques like Phase Disposition (PD), Phase Opposition Disposition (POD) and Anti Phase Opposition Disposition (APOD). For better performance of the inverter above three PWM techniques will be compared and analyzed to find the low THD configuration. The simulation of switching topology is done by MATLAB/Simulink.

scholarly journals Review of Multilevel Voltage Source Inverter Topologies and Analysis of Harmonics Distortions in FC-MLI

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1329 ◽  
Author(s):  
Ronak A. Rana ◽  
Sujal A. Patel ◽  
Anand Muthusamy ◽  
Chee woo Lee ◽  
Hee-Je Kim
Keyword(s):  
Power Systems ◽  
Electromagnetic Interference ◽  
Power Dissipation ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Voltage Source ◽  
Multilevel Inverters ◽  
Output Side ◽  
Multi Level ◽  
Successive Method

We review the most common topology of multi-level inverters. As is known, the conventional inverters are utilized to create an alternating current (AC) source from a direct current (DC) source. The two-level inverter provides various output voltages [(Vdc/2) and (−Vdc/2)] of the load. It is a successive method, but it makes the harmonic distortion of the output side, Electromagnetic interference (EMI), and high dv/dt. We solve this problem by constructing the sinusoidal voltage waveform. This is achieved by a “multilevel inverter” (MLI). The multilevel inverter creates the output voltage with multiple DC voltages as inputs. Many voltage levels are combined to produce a smoother waveform. During the last decade, the multilevel inverter has become very popular in medium and high-power applications with some advantages, such as the reduced power dissipation of switching elements, low harmonics, and low EMIs. We introduce the information about several multilevel inverters such as the diode-clamped multilevel inverter (DC-MLI), cascaded H-bridge multilevel inverter (CHB-MLI), and flying-capacitor multilevel inverter (FC-MLI) with Power systems CAD (PSCAD) simulation. It is shown that THD is 28.88% in three level FC-MLI while THD is 18.56% in five level topology. Therefore, we can decrease the total harmonic distortion adopting the higher-level topology.

scholarly journals Asymmetrical Cascade Multilevel Inverter Design using Modified Level Shift Pulse Width Modulation

2019 ◽  
Vol 8 (2) ◽  
pp. 2650-2659
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Voltage Regulation ◽  
Total Harmonic Distortion ◽  
Level Shift ◽  
Superior Result ◽  
Medium Voltage ◽  
Multi Level ◽  
The Cost

Multi-level inverter technology emerges as extremely significant choice in region of high-power medium voltage energy control. The multi-level inverter(MLI) generate a quasi sinusoidal voltage from various level of dc voltage. The proposed inverter design for 21 level cascaded MLI inverter by using Level Shifted-Sinusoidal Pulse Width Modulation (LS-SPWM) technique with new carrier and evaluate the Total Harmonic Distortion(THD). The proposed inverter design has the least number of components to lessen the cost and get better reliability of converter for medium power applications. The presented control techniques are applicable to cascaded H-bridge 21 level inverter to get better voltage regulation and thereby, lead the better efficiency,reliability and economic improvement. The selected pattern gave superior result in Total Harmonic distortion.

scholarly journals Fifteen Level Cascaded H-Bridge Multilevel Inverter Fed Induction Motor

2019 ◽  
Vol 8 (11) ◽  
pp. 640-645 ◽  
Keyword(s):  
Induction Motor ◽  
High Power ◽  
Output Voltage ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Energy Control ◽  
Medium Voltage ◽  
Multilevel Inverters ◽  
Output Waveform ◽  
High Magnitude

In power electronics, Multilevel Inverter (MLI) plays very important role. It has spectacular applications in the field of high power & medium voltage energy control. The simulation of “Fifteen Level Cascaded H-Bridge Multilevel Inverter (MLI) Fed Induction Motor” is studied in this paper. The MLI’s are used to get high magnitude output voltage with reduced harmonic distortion. The reduction of harmonic distortion and the purity of the output waveform when compared with five level and nine level multilevel inverters is seen in this paper.

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