scholarly journals Improved Cascaded H-Bridge Multilevel Inverters with Voltage-Boosting Capability

Electronics ◽  
2021 ◽  
Vol 10 (22) ◽  
pp. 2801
Author(s):  
Sze Sing Lee ◽  
Yongheng Yang ◽  
Yam P. Siwakoti ◽  
Reza Barzegarkhoo
Keyword(s):  
Theoretical Analysis ◽  
Power Efficiency ◽  
Experimental Tests ◽  
Multilevel Inverter ◽  
Multilevel Inverters ◽  
Front End ◽  
Power Switch ◽  
Voltage Stress ◽  
Power Switches ◽  
Lower Voltage

This paper proposes two improved cascaded H-bridge (ICHB) multilevel inverters that feature voltage-boosting capability. The conventional H-bridge with a front-end dc–dc boost converter was restructured for single-stage operation. The developed three-level topology not only saves one power switch but also exhibits lower voltage stress across its capacitor. Extension to five-level generation was also introduced by merely adding two power switches and one capacitor. The final five-level topology outperforms the classical cascaded H-bridge (CHB) multilevel inverter with a significant reduction in the power switch count, with a 42% and 50% reduction in both the isolated dc source and inductor counts. The power efficiency was also improved without compromising the modularity feature of the classical CHB multilevel inverter. The operation and theoretical analysis of the proposed topologies were validated via simulations and experimental tests.

Switching Modulation Strategies for Multilevel Inverter

2021 ◽  
Vol 20 (2) ◽  
pp. 1-7
Author(s):  
Jahanzeb - ◽  
Shahrin Md. Ayob ◽  
Saifullah Khan ◽  
Mohd Zaki Daud ◽  
Razman Ayop
Keyword(s):  
Single Phase ◽  
Multilevel Inverter ◽  
Level Control ◽  
Multilevel Inverters ◽  
Power Switches ◽  
Modulation Schemes ◽  
Multicarrier Pwm

There is always a need to create efficient and optimized converters to deliver the best possible results to achieve a better THD profile in the waveform output. One way is by controlling the switching of the power switches of the converters using appropriate modulation schemes. While numerous works have been done in proposing new switching modulation strategies for multilevel inverters, this work will compare multicarrier PWM and near-to-level control (NLC) modulation schemes. In this paper, multicarrier PWM variants, namely, PD-PWM, POD-PWM, and APOD-PWM, are designed and simulated. Their voltage THD and spectrum performance are discussed when applied to single-phase 7, 9, and 11-level cascaded multilevel inverters. Then NLC modulation will be designed and applied to similar multilevel inverter circuits. It will be shown that the NLC exhibits some superior performances compared to PWM-based but with several drawbacks that can be optimized. 

Switched capacitor based single DC source boost multilevel inverter (S2-MLI) featuring isolation based soft charging with minimum device count

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Tamiru Debela ◽  
Jiwanjot Singh
Keyword(s):  
Pulse Width Modulation ◽  
Multilevel Inverter ◽  
Superior Performance ◽  
Inrush Current ◽  
Switched Capacitor ◽  
Multilevel Inverters ◽  
Current Voltage ◽  
Power Switches ◽  
Input Source ◽  
Interest In Research

Abstract Multilevel inverters (MLIs) have formed a new wave of interest in research and industry. Switched capacitor-based multilevel inverters are used to avoid the need for multiple separated DC sources compared to cascaded MLIs. However, the inclusion of several capacitors creates problems such as high inrush current, voltage imbalance. To avoid these drawbacks, this paper proposes an isolation-based scheme by using a flyback converter in the switched capacitor multilevel inverter. Further, the overall topology provides step-up AC voltage across the load from a single DC source with fewer power switches. To generate a step-up five-level voltage across the load, switched capacitor-based multilevel inverter needs six power switches and only one capacitor. To get the appropriate switching operation to generate the NL-levels, phase disposition pulse width modulation (PD-PWM) has been developed. The extended nine-level S 2 -MLI is also discussed in this paper under different conditions as change in input source voltage and dynamic load change. Moreover, to prove the superior performance of switched-capacitor single DC source multilevel inverter (S2-MLI), comparative analysis with existing single DC source MLI has been performed. The effectiveness and feasibility of the proposed topology are tested with varieties of loads by simulation using Matlab/Simulink. To validate the simulation results, hardware implementation has been done of five-level S2-MLI considering resistive and motor load by using DSpace 1103 controller.

scholarly journals Switched Capacitor Based Cascaded Half-Bridge Multilevel Inverter With Voltage Boosting Feature

2021 ◽  
Vol 6 (1) ◽  
pp. 63-73
Author(s):  
Hossein Khoun-Jahan ◽  
Keyword(s):  
Multilevel Inverter ◽  
Inrush Current ◽  
Switched Capacitor ◽  
Multilevel Inverters ◽  
Main Drawback ◽  
Front End ◽  
Simulation Results ◽  
Resonant Capacitor ◽  
Cascaded Multilevel Inverter ◽  
Inverter Topology

Cascaded multilevel inverter (CMI) topology is prevalent in many applications. However, the CMI requires many switches and isolated dc sources, which is the main drawback of this type of inverter. As a result, the volume, cost and complexity of the CMI topology are increased and the efficiency is deteriorated. This paper thus proposes a switched-capacitor-based multilevel inverter topology with half-bridge cells and only one dc source. Compared to the conventional CMI, the proposed inverter uses almost half the number of switches, while maintaining a boosting capability. Additionally, the main drawback of switched-capacitor multilevel inverters is the capacitor inrush current. This problem is also averted in the proposed topology by using a charging inductor or quasi-resonant capacitor charging with a front-end boost converter. Simulation results and lab-scale experimental verifications are provided to validate the feasibility and viability of the proposed inverter topology.

scholarly journals A New Interconnection of Micro Grid Distributed Energy Sources using Space Vector Multilevel Inverter

2019 ◽  
Vol 8 (2S3) ◽  
pp. 185-190
Keyword(s):  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Space Vector ◽  
Multilevel Inverters ◽  
Power Resources ◽  
Renewable Power ◽  
Power Switches ◽  
Electric Parameters ◽  
Overall Performance ◽  
Micro Grid

This paper describes on a new compilation of micro grid era the usage of multilevel inverter. In this paper we have linked three renewable resources are parallel like wind turbine, PV cellular and Pico Hydel generator set to deliver strength to a exceptionally small assortment of residential, reputable of business building in a locality. The electricity is generated from renewable power resources and it's far connected to space vector primarily based multilevel inverter. Therefore the power is completely computerized for this reason the strength losses can be less, reduced switching sample losses and grids have the capacity to reply robotically to the versions in electric parameters answerable for the clean functioning of the grid [1]. Moreover, decrease prices of power switches in the new semiconductor technologies as well as the current demand on excessive overall performance inverters required through Renewable Energy Systems (RES) decreased total Harmonic distortion(THD) within the spectrum of switching waveform have extended the programs of Multilevel inverters

scholarly journals A Novel High Gain Voltage-Lift Technique Based Transformer free Non-isolated Quadratic Boost Converter

2018 ◽  
Vol 225 ◽  
pp. 04010
Author(s):  
Pydikalva Padmavathi ◽  
Sudhakar Natarajan
Keyword(s):  
Theoretical Analysis ◽  
Simple Structure ◽  
High Gain ◽  
Boost Converter ◽  
Constant Frequency ◽  
Boost Converters ◽  
High Efficient ◽  
Voltage Stress ◽  
Simulation Results ◽  
Lower Voltage

A novel high gain voltage lift technique based transformer free non isolated boost converter is proposed with single switch operating at constant frequency in this paper. This performance of this converter is very good and high efficient compared to the conventional boost converters. The high gain is obtained by applying voltage lift cell to the quadratic boost converter. The simple structure, easy controlling and lower voltage stress. The operating principle with theoretical analysis and simulation results of proposed converter for various loads at 10 kHz frequency are discussed in this paper to compare the performance of this novel boost converter.

scholarly journals A novel simulated multilevel inverter topolo-gy with minimal switches

2017 ◽  
Vol 7 (1.2) ◽  
pp. 205
Author(s):  
R. Anand ◽  
S. Muthu Balaji
Keyword(s):  
Output Voltage ◽  
Multilevel Inverter ◽  
Experimental Results ◽  
New Technique ◽  
Multilevel Inverters ◽  
Maximum Charge ◽  
Power Switches

In this project, an advanced design of simulated multilevel inverters is proposed, which helps to boost the number of output voltage levels and decrease the number of power switches, driver circuits, and the maximum charge of the inverter. It is significant to note down advanced design, the unidirectional power switches are used. Results in decreased complexity and economical. The comparison is done with the conventional topologies and confirmed by simulation outcome. The planned design by using the new technique in produce all voltage levels for a stage inverter which its performance and functional accuracy is confirmed by simulation and experimental results.

scholarly journals Design and Simulation of Seven Level Cascaded H Bridge Inverter for Medium Power Applications

2021 ◽  
Vol 9 (8) ◽  
pp. 1134-1139
Keyword(s):  
High Power ◽  
Pulse Width Modulation ◽  
Low Voltage ◽  
Pulse Generation ◽  
Multilevel Inverters ◽  
Switching Power ◽  
Voltage Stress ◽  
Power Switches ◽  
Power Application ◽  
Inverter Topology

In the recent years, multilevel inverters (MLI) are highly being used for medium power and high-power applications because of several merits such as low voltage stress on the power switches, low electromagnetic interferences, low dv/dt ratio to supply lower harmonic contents in the output voltage and current. Multilevel inverters have become more popular in electric high-power application with the promise of very low disturbances and the possibility to function at lower switching frequencies than ordinary two-level inverters. It is also more efficient since the inverter has a component which operates the switching power devices at line frequency. So that there is no need for all switches to work in high frequency it leads to simpler and more reliable control of the inverter. The seven-level inverter with reduced number of switches with PWM (Pulse Width Modulation) switching is simulated. It is observed that the pulse generation using PWM switching leads to further reduction of THD. Simulations of the proposed system have been carried out in MATLAB/SIMULINK environment to show its effectiveness of Seven Level Inverter Topology for power quality issues.

scholarly journals Comparison of New Multilevel Inverter Topology with Conventional Topologies Used for Induction Heating System

2022 ◽  
Vol 18 (1) ◽  
pp. 48-57
Author(s):  
Aws Al-Jrew ◽  
Jawad Mahmood ◽  
Ramzy Ali
Keyword(s):  
Induction Heating ◽  
Harmonic Distortion ◽  
Heating System ◽  
Multilevel Inverter ◽  
Multilevel Inverters ◽  
Switching Losses ◽  
Power Switches ◽  
The Cost ◽  
Inverter Topology ◽  
Induction Heating System

In this article, a comparison of innovative multilevel inverter topology with standard topologies has been conducted. The proposed single phase five level inverter topology has been used for induction heating system. This suggested design generates five voltage levels with a fewer number of power switches. This reduction in number of switches decreases the switching losses and the number of driving circuits and reduce the complexity of control circuit. It also reduces the cost and size for the filter used. Analysis and comparison has been done among the conventional topologies (neutral clamped and cascade H-bridge multilevel inverters) with the proposed inverter topology. The analysis includes the total harmonic distortion THD, efficiency and overall performance of the inverter systems. The simulation and analysis have been done using MATLAB/ SIMULINK. The results show good performance for the proposed topology in comparison with the conventional topologies.

scholarly journals New Switched-Dual-Source Multilevel Inverter for Symmetrical and Asymmetrical Operation

2018 ◽  
Author(s):  
Kennedy Aganah ◽  
Cristopher Luciano ◽  
Mandoye Ndoye ◽  
Gregory Murphy
Keyword(s):  
Output Voltage ◽  
Wind Farms ◽  
Multilevel Inverter ◽  
Solar Pv ◽  
Multilevel Inverters ◽  
Voltage Stress ◽  
Dual Source ◽  
Utility Scale ◽  
Industry Choice ◽  
Laboratory Prototype

The past two decades has seen a growing demand for high-power, high-voltage utility scale inverters mostly fueled by the integration of large solar PV and wind farms. Multilevel inverters have emerged as the industry choice for these megawatt range inverters because their reduced voltage stress, capable of generating an almost sinusoidal voltage, in-built redundancy, among others. This paper present a new Switched-Source Multilevel Inverter (SS MLI) architecture. The new inverter show superior over existing topologies. It has reduced voltage stress on the semiconductor, uses less number of switches –reduced size/weight/cost and increased efficiency. The new SSMLI is comprised of two voltage sources (V1, V2) and 6 switches. It is capable of generating 5-level output voltage in symmetric modes (i.e., V1 = V2), and 7-level output voltage in asymmetric modes (i.e., V1 ≠ V2). To demonstrate the validity of the proposed inverter, simulations results using MATLAB® /Simulink® for 5- and 7-level output voltages are presented . The simulations are also verified experimentally using a laboratory prototype.

scholarly journals A novel single-phase PWM asymmetrical multilevel inverter with number of semiconductor switches reduction

2019 ◽  
Vol 10 (3) ◽  
pp. 1133
Author(s):  
S. Kakar ◽  
S. M. Ayob ◽  
N. M. Nordin ◽  
M. S. Arif ◽  
A. Jusoh ◽  
...  
Keyword(s):  
Single Phase ◽  
Pulse Width Modulation ◽  
Multilevel Inverter ◽  
Semiconductor Switches ◽  
Voltage Stress ◽  
Gate Driver ◽  
Inverter Topology ◽  
Sinusoidal Pulse Width Modulation ◽  
Lower Voltage ◽  
Fundamental Module

In this paper, a new asymmetrical multilevel inverter topology (MLI) is proposed with the objectives of using decreased number of semiconductor switches, dc voltage sources, gate driver circuits and dc links. The structure of presented MLI is very simple and modular. The fundamental module of this structure consists of nine semiconductor switches (eight unidirectional and one bidirectional) and four asymmetrical configured DC sources (ratio of 1:2), which can generate 13-level output voltage. To validate the design, a Matlab-Simulink based model is developed. For this paper, a Sinusoidal Pulse Width Modulation (SPWM) is deployed as the switching strategy of the proposed MLI. The circuit model is simulated under pure resistive and inductive loads. It will be shown that the circuit performs well under both loads. Comparison with traditional MLIs and other recently introduced MLIs will be conducted to show the superiority of the proposed MLI in terms of reduced number of devices and lower voltage stress across the switches.

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