scholarly journals Implementation of 7-Level and 31-Level Cascaded H-Bridge Multilevel Inverters with Reduced Number of Semiconductor Switches

2021 ◽  
Vol 9 (VI) ◽  
pp. 4868-4874
Author(s):  
CH. Sajan
Keyword(s):  
Electromagnetic Interference ◽  
Switching Sequence ◽  
Matlab Simulink ◽  
Dc Voltage ◽  
Multilevel Inverters ◽  
Semiconductor Switches ◽  
Modulation Technique ◽  
Switching Losses ◽  
Low Order

Multilevel inverters are widely used because of its increased power rating with reduced harmonics and electromagnetic interference. The proposed 7-level cascaded H-Bridge inverter is symmetrical in nature and uses equal sources of DC voltage. Whereas 31-level cascaded H-Bridge inverter is asymmetrical in nature and uses unequal sources of DC voltage. The PD-PWM modulation technique was used here to achieve switching sequence. The proposed idea was validated through simulation and the results provide better efficiency, fewer low order harmonics and lower switching losses. The proposed topology is simulated using MATLAB / SIMULINK.

Three phase z-source neutral point clamped inverter with multicarrier PWM technique

2016 ◽  
Vol 35 (5) ◽  
pp. 1575-1591 ◽  
Author(s):  
F.X. Edwin Deepak ◽  
V. Rajasekaran
Keyword(s):  
Electromagnetic Interference ◽  
Electronic Device ◽  
Neutral Point ◽  
Voltage Source ◽  
Electrical Power System ◽  
Content Type ◽  
Dc Voltage ◽  
Multilevel Inverters ◽  
Switching Losses ◽  
Three Phase

Purpose The purpose of this paper is to present the three phase seven-level Z-source neutral point clamped (NPC) inverter with multicarrier pulse-width modulation (PWM) technique. Despite numerous topologies and modulation methods, there is a dire need of developing PWM techniques that can be deployed in multilevel inverters. These inverters decrease the total harmonic distortion and it has a good performance for various electrical power system applications. The proposed inverter is investigated for its performance by executing it in shoot through and non-shoot through modes. Design/methodology/approach The purpose is validated through MATLAB/Simulink software platform for implementing the proposed seven-level Z-source NPC inverter outlined with multicarrier based phase disposition technique. The experimental results are verified using SPARTAN 3E FPGA controller with the same control strategy. Findings The efficiency of the proposed inverter is confirmed in terms of increased and faster conversion in the shoot-through mode. By using PDPWM technique the maximum boost gain is achieved with lower modulation index. High control of DC voltage is obtained with only one DC voltage source and one Z network. Originality/value Three phase multilevel inverters are widely used in improving the output voltage quality and reducing the encountered electromagnetic interference in electronic device or circuitry. They are employed in medium and high –power applications to attain increased power ratings while decreasing the switching losses. The performance results shown in this paper will satisfy the above needs of usage in certain applications and less switching losses.

scholarly journals Design and Analsyis of 31-Level Asymmetric Cascaded H-Bridge Multilevel Inverter with Reduced Number of Switches

2020 ◽  
Vol 2 (2) ◽  
pp. 14-28
Author(s):  
Manoranjan A ◽  
Christober Asir Rajan C
Keyword(s):  
Multilevel Inverter ◽  
Modes Of Operation ◽  
Dc Voltage ◽  
Modulation Technique ◽  
Switching Losses ◽  
Power Switches ◽  
Low Order

A new multilevel inverter with less no of power switches is proposed. This is based on cascaded H-bridge topology. The design and analysis of 31-level reduced switch inverter with different modes of operation are presented in this paper. The proposed inverter is asymmetric in nature and it uses unequal DC voltage sources. PD-PWM modulation technique has been used here to get proper switching. The proposed idea has been validated through simulation and the received results provides better efficiency, less low order harmonics and less switching losses.

scholarly journals MATLAB/simulink study of multi-level inverter topologies using minimized quantity of switches

2017 ◽  
Vol 7 (1.5) ◽  
pp. 209
Author(s):  
B.Vijaya Krishna ◽  
B. Venkata Prashanth ◽  
P. Sujatha
Keyword(s):  
Harmonic Distortion ◽  
Pulse Generation ◽  
Multilevel Inverter ◽  
Matlab Simulink ◽  
Multilevel Inverters ◽  
Energy Applications ◽  
Electrical Drives ◽  
Switching Losses ◽  
Trigger Circuit ◽  
Inverter Topology

Multilevel Inverters (MLI) have very good features when compared to Inverters. But using more switches in the conventional configuration will reduce its application in a wider range. For that reason a modified 7-level MLI Topology is presented. This new topology consists of less number of switches that can be reduced to the maximum extent and a separate gate trigger circuit. This will reduce the switching losses, reduce the size of the multilevel inverter, and cost of installation. This new topology can be used in Electrical drives and renewable energy applications. Performance of the new MLI is tested via. Total harmonic distortion. This construction structure of this multilevel inverter topology can also be increased for 9-level, 11-level and so on and simulated by the use of MATLAB/SIMULINK. A separate Carrier Based PWM Technique is used for the pulse generation in this configuration.

scholarly journals Performance Analysis of Non-Isolated DC-DC Buck Converter Using Resonant Approach

2018 ◽  
Vol 8 (5) ◽  
pp. 3350-3354 ◽  
Author(s):  
K. Jayaswal ◽  
D. K. Palwalia
Keyword(s):  
Electromagnetic Interference ◽  
Operating Performance ◽  
Operational Reliability ◽  
Buck Converter ◽  
Matlab Simulation ◽  
Soft Switch ◽  
Dc Voltage ◽  
Leakage Inductance ◽  
Switching Losses ◽  
Simulation Results

DC-DC converters preserve or control the output DC voltage. Due to parasitic constituents such as leakage capacitance of both diode and inductor, and transformer leakage inductance, DC-DC converters mostly operate on rigid switching conditions which result in high switching losses. These parasitic constituents affect the dc-dc converter’s operational reliability, instigate electromagnetic interference issues and limit the converter’s operation at higher frequency operations. In this paper, resonant or soft-switch approach has been employed to improve the operating performance and design-oriented principle investigations have been carried out for overcoming the issues of parasitic constituents in 24-12V DC-DC step-down (buck) converter. This paper divulges the analysis and Matlab Simulation results for 24-12V buck converter based on resonant or soft-switching approach.

scholarly journals Soft Switching of Buck Converter with Coupled Inductor

2020 ◽  
pp. 272-277
Keyword(s):  
Output Voltage ◽  
Buck Converter ◽  
Soft Switching ◽  
Buck Converters ◽  
Matlab Simulink ◽  
Dc Voltage ◽  
Switching Losses ◽  
Step Down ◽  
Circuit Configuration

Buck converters are step down dc-dc converters to convert fixed dc voltage to controlled dc voltage. Generally, hard switching is used to control dc output voltage of buck converter. But this approach leads to high switching losses. In this paper, we propose a Soft Switching of Buck converter with Coupled Inductor, to reduce the switching losses. The circuit configuration has been designed with minimum components for realizing the soft switching. The Simulation of Soft switching of buck converter with coupled inductor circuit has been carried out using MATLAB/SIMULINK and the results obtained.

scholarly journals Performance Assessment of Modular Multilevel Half Bridge Inverter for High Power PV Application

2019 ◽  
Vol 9 (1S) ◽  
pp. 304-308
Keyword(s):  
High Power ◽  
Harmonic Distortion ◽  
Switching Frequency ◽  
Current Waveform ◽  
Line Voltage ◽  
Multilevel Inverters ◽  
Semiconductor Switches ◽  
Switching Losses ◽  
Photovoltaic Applications

This paper presents three-level Modular Multilevel Half Bridge Inverter to achieve lower total harmonic distortion and improved efficiency. Compared to conventional inverter, multilevel inverters provide output voltage of high quality and current waveform while using the low switching frequency. The use of multilevel inverters reduces the switching losses, size of semiconductor switches and the number of harmonic filters as compared to the traditional DC-AC inverters. This paper investigates different classification of multilevel inverters suitable for photovoltaic applications of high power based on efficiency and THD of the output line voltage and current waveform. Multilevel Inverter topologies are simulated as the same environment using MATLAB/Simulink.

scholarly journals Positive output elementary Luo converter for fixed-frequency ZVS operation

2017 ◽  
Vol 65 (2) ◽  
pp. 255-262
Author(s):  
S. J. V. Bright ◽  
S. Ramkumar ◽  
H. Anand
Keyword(s):  
Electromagnetic Interference ◽  
Experimental Studies ◽  
Soft Switching ◽  
Switching Frequency ◽  
Fixed Frequency ◽  
Zero Voltage Switching ◽  
Power Semiconductor ◽  
Semiconductor Switches ◽  
Switching Losses ◽  
Zero Voltage

Abstract Luo converter is one amid the developed DC-DC converters offering higher voltage gain. Soft-switching techniques, like zero-voltage switching (ZVS), repress switching losses, and hence the system efficiency and the life of the power semiconductor switches are improved. Incorporation of soft switching in fixed-frequency operation of the Luo converters may persuade them in the regulated power supply applications. The existing variable switching frequency solution suffers from a number of problems viz. complexity in filter designing, more electromagnetic interference (EMI), etc. This paper proposes a positive output elementary Luo converter (POELC) involving ZVS with the wherewithal of working in fixed frequency. A comprehensive discussion on the proposed circuit topology is detailed with both simulation and experimental studies. Systematic descriptions of basic POELC, variable-frequency ZVS-POELC, and fixed-frequency ZVS-POELC make an impact on the understanding of related concepts by the researchers in this field.

The Analysis and Simulation of Contact Loss between Pantograph and Catenary on Electric Railway

2015 ◽  
Vol 713-715 ◽  
pp. 1277-1280
Author(s):  
Yin Han Gao ◽  
Ju Xian Wang ◽  
Kai Yu Yang ◽  
Tian Hao Wang ◽  
Zhan Yang An
Keyword(s):  
Equivalent Circuit ◽  
Electromagnetic Interference ◽  
Broad Band ◽  
High Amplitude ◽  
Matlab Simulink ◽  
Arc Model ◽  
Traction Network ◽  
Electric Railway ◽  
The Moment

Based on the classical Mayer-arc model, this paper establishes the equivalent circuit of traction network for AC25kV electric railway from the essence of contact loss discharge. The voltage waves of contact loss arc at different moments are obtained by MATLAB/simulink. Through the analysis, it can be confirmed that the EMI (electromagnetic interference) with broad band and high amplitude will appear at the moment the contact loss between pantograph and catenary happens. Finally, relevant measures are given to avoid the probability event of contact loss.

scholarly journals A Sub-Region Based Space Vector Modulation Scheme for Dual 2-Level Inverter System

2018 ◽  
Vol 8 (6) ◽  
pp. 4902
Author(s):  
R. Palanisamy ◽  
A. Velu ◽  
K. Selvakumar ◽  
D. Karthikeyan ◽  
D. Selvabharathi ◽  
...  
Keyword(s):  
Output Voltage ◽  
Modulation Scheme ◽  
Space Vector Modulation ◽  
Switching Loss ◽  
Space Vector ◽  
Dc Voltage ◽  
Multilevel Inverters ◽  
Harmonic Content ◽  
Voltage Stress ◽  
Vector Modulation

This paper deals the implementation of 3-level output voltage using dual 2-level inverter with control of sub-region based Space Vector Modulation (SR-SVM). Switching loss and voltage stress are the most important issues in multilevel inverters, for keep away from these problems dual inverter system executed. Using this proposed system, the conventional 3-level inverter voltage vectors and switching vectors can be located. In neutral point clamped multilevel inverter, it carries more load current fluctuations due to the DC link capacitors and it requires large capacitors. Based on the sub-region SVM used to control IGBT switches placed in the dual inverter system. The proposed system improves the output voltage with reduced harmonic content with improved dc voltage utilisation. The simulation and hardware results are verified using matlab/simulink and dsPIC microcontroller.

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