scholarly journals A Seventeen Multilevel High-Power Application Inverter with Low Total Harmonic Distortion

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Ajmal Farooq ◽  
Shanshan Tu ◽  
Fiaz Ahmad ◽  
Muhammad Zeeshan Malik ◽  
Obaid U. Rehman ◽  
...  
Keyword(s):  
High Power ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Pv Systems ◽  
Input Side ◽  
Power Application ◽  
The Individual ◽  
The Cost ◽  
Switching Devices

In this paper, a new topology of multilevel inverter (MLI) is designed with a fewer number of components and low total harmonic distortion (THD) for high-power photovoltaic (PV) systems. The key limitations of conventional MLI topologies are high total harmonic distortion (THD) and the use of a large number of switching components due to which the cost of the overall inverter is high. In conventional MLI, THD can be significantly reduced by the addition of a large value filter element at the input side; however, it will result in increased size and cost. Thus, achieving a pure sinusoidal AC at the output and to maintain a low THD level is a major issue in conventional MLIs. The proposed MLI has the advantage of decreasing the output THD by using a modified form of the cascaded H-Bridge structure and sine pulse width modulation technique. The proposed inverter consists of 6 unidirectional switches and 2 bidirectional switches, and there is no extra requirement for additional voltage balancing capacitors or clinching diodes. The individual switching states and SPWM operation for generating the gate pulses of the proposed MLI are discussed in detail. Relevant waveforms are plotted, equations are derived, and mathematical analysis is carried out. A steady-state analysis of the proposed MLI demonstrates an output voltage with 17 levels while using only four DC sources. Simulation results of the proposed MLI for single-phase and three-phase structures are obtained, and comparison is carried out with existing MLI topologies which shows that the proposed MLI has significantly low THD and better performance. From the results, it is clear that the proposed MLI has a THD of 3.52% in comparison with four conventional MLIs whose THDs are 6.1%, 6.63%, 7.3%, and 9.93%. Moreover, the proposed MLI generates 17 voltage levels by using only 08 switching devices, whereas the conventional MLIs use more than 10 switching devices for the generation of 15 voltage levels.

scholarly journals Symmetrical and Asymmetrical Multilevel Inverter Structures with Reduced Number of Switching Devices

2018 ◽  
Vol 11 (1) ◽  
pp. 144 ◽  
Author(s):  
M. H. Yatim ◽  
A. Ponniran ◽  
M. A. Zaini ◽  
M. S. Shaili ◽  
N. A. S. Ngamidun ◽  
...  
Keyword(s):  
Stress Reduction ◽  
Pulse Width ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Total Harmonic Distortion ◽  
Multilevel Structure ◽  
Distortion Reduction ◽  
Switching Devices

The purpose of this study is to analyze the operation and design of symmetrical and asymmetrical multilevel inverter structures with reduced number of switching devices. In this study, the term of conventional inverter is defined as a single cascaded inverter. Specifically, the inverter operates in three complete loops and only produces 2-level and 3-level of output voltages. Usually, cascaded structure suffers from the high total harmonic distortion. Thus, by considering multilevel structure of inverter, low total harmonic distortion reduction and voltage stress reduction on switching devices can be archived. Sinusoidal pulse width modulation and modified square pulse width modulation are used as modulation techniques in switching schemes of the designed multilevel inverters. The findings indicate that, the designed multilevel structure cause low total harmonics distortion at the output voltage. Furthermore, the asymmetrical structure is producing the same output voltage levels with reduced number of switching devices compared to the symmetrical structure is experimentally confirmed. The findings show that the total harmonic distortion for 7-level (symmetrical) and 9-level (asymmetrical) are 16.45% and 15.22%, respectively.

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 Analysis of Symmetric and Asymmetric Multilevel Inverter Topologies Using Reduced Number of Switching Devices Circuit Structure

2018 ◽  
Vol 7 (4.30) ◽  
pp. 234
Author(s):  
M. H. Yatim ◽  
A. Ponniran ◽  
A. A. Bakar ◽  
A. N. Kasiran ◽  
K. R. Noor ◽  
...  
Keyword(s):  
Pulse Width ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Voltage Level ◽  
Switching Strategy ◽  
Circuit Structure ◽  
Sinusoidal Pulse Width Modulation ◽  
Switching Devices

This paper presents symmetric and asymmetric multilevel inverter principles using reduced number of switching devices circuit structure. Principally, asymmetric multilevel inverter topology able to produce higher output voltage level without modification of the structure in order to reduce total harmonic distortion at the output voltage. In contrast, the number of switching devices need to be increased with symmetric principle when higher output voltage level is considered. In this study, 5-level reduced number of switching devices circuit structure is selected as a circuit configuration for symmetric (5-level structure) and asymmetric (7-level and 9-level structures) multilevel inverters. For switching strategy, modified pulse width modulation and sinusoidal pulse width modulation are selected to produce output voltage levels of the inverter. Modified pulse width modulation used low switching frequency in producing signal and needs higher output voltage levels to achieve low total harmonic distortion. In contrast, sinusoidal pulse width modulation used high switching frequency in order to minimize total harmonic distortion. Theoretically, total harmonic distortion is reduced when number of output voltage level is increased for both cases. The findings show that, the 9-level asymmetric topology has lower total harmonic distortion compared to the 5-level symmetric topology and 7-level asymmetric topology, whereby these inverters using the same circuit configuration. The results show that, the total harmonic distortions of 9-level asymmetric topology, 7-level asymmetric topology and 5-level symmetric topology are 14.54%, 18.08% and 26.92%, respectively with sinusoidal pulse width modulation switching strategy. Meanwhile, with modified pulse width modulation switching strategy, the total harmonic distortions of 9-level asymmetric topology, 7-level asymmetric topology and 5-level symmetric topology are 18.7%, 21.68% and 28.99%, respectively. Therefore, 9-level asymmetric with sinusoidal pulse width modulation switching strategy show the lowest total harmonic distortion with optimum number of switching devices.

FPGA Based Design and Validation of Asymmetrical Reduced Switch Multilevel Inverter

2016 ◽  
Vol 7 (2) ◽  
pp. 340 ◽  
Author(s):  
C Bharatiraja ◽  
Harshavardhan Reddy ◽  
Sunkavalli Satya Sai Suma ◽  
N SriRamsai
Keyword(s):  
High Power ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Lower Cost ◽  
Harmonic Distortion ◽  
Circuit Complexity ◽  
Multilevel Inverter ◽  
Total Harmonic Distortion ◽  
Voltage Output ◽  
Inverter Topology

This paper proposes a new Asymmetrical multilevel inverter topology with reduced number of switches. This topology is superior to the existing multilevel inverter (MLI) configurations in terms of lower total harmonic distortion (THD) value and lower cost. The idea incorporates a new module setup comprising of four different voltage sources having voltage output levels in a specific ratio. The proposed topology uses a novel pulse width modulation (PWM) technique (as presented) to control the gating pulses. The operation is simulated using MATLAB/SIMULINK and its results are validated through FPGA Spartan 3 based hardware prototype inverter (using three voltage sources to produce a 7 level output, which may be extended to 15 level). The circuit complexity is drastically reduced and it is suitable for medium and high power applications. THD for the output is quite low when compared with the conventional inverter.

scholarly journals Harmonic Elimination of a PV Based Cascaded H-bridge Seven Level Inverter for Induction Motor Drive

2020 ◽  
Vol 9 (3) ◽  
pp. 668-676
Keyword(s):  
High Power ◽  
Pulse Width Modulation ◽  
Current Source ◽  
Harmonic Distortion ◽  
Industrial Applications ◽  
Total Harmonic Distortion ◽  
Multilevel Inverters ◽  
Switching Losses ◽  
Novel Approach ◽  
Harmonic Elimination

In today’s era, reliable and good quality power is an essential requirement in industry, which can be supplied by inverters at medium and high power. Most of the appliances in the industry require high power or medium power for their operation. Power electronics devices such as inverters work on medium voltage and high power and are suitable for industrial applications and renewable particularly Photovoltaic (PV) integration. Multilevel inverters are more superior to conventional inverters because of lower harmonics and switching losses, but as the number of levels increases, complexity also increases. Therefore, maintaining the harmonics at lower level and lesser complexity of multilevel inverters is a challenge for researchers. In this research paper, a novel approach for implementation of seven level cascaded H- bridge configuration of multilevel inverter using direct current source and photovoltaic panels has been demonstrated. The basic working principle of seven level cascaded hybrid bridge inverter, pulse width modulation techniques and total harmonic distortion are explained through simulations in Matlab and Xilinx 14.3 software and the same is experimentally validated through FPGA controller based Spartan 6. The designed seven level inverter results in lower total harmonic distortion with lesser complexity when used to connect PV panels.

scholarly journals A Novel Single-Switch Single-Stage LED Driver with Power Factor Correction and Current Balancing Capability

Electronics ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1340
Author(s):  
Yih-Her Yan ◽  
Hung-Liang Cheng ◽  
Chun-An Cheng ◽  
Yong-Nong Chang ◽  
Zong-Xun Wu
Keyword(s):  
Power Factor ◽  
High Power ◽  
Pulse Width Modulation ◽  
Power Factor Correction ◽  
Harmonic Distortion ◽  
Boost Converter ◽  
Single Stage ◽  
Led Driver ◽  
Flyback Converter ◽  
High Power Factor

A novel single-switch single-stage high power factor LED driver is proposed by integrating a flyback converter, a buck–boost converter and a current balance circuit. Only an active switch and a corresponding control circuit are used. The LED power can be adjusted by the control scheme of pulse–width modulation (PWM). The flyback converter performs the function of power factor correction (PFC), which is operated at discontinuous-current mode (DCM) to achieve unity power factor and low total current harmonic distortion (THDi). The buck–boost converter regulates the dc-link voltage to obtain smooth dc voltage for the LED. The current–balance circuit applies the principle of ampere-second balance of capacitors to obtain equal current in each LED string. The steady-state analyses for different operation modes is provided, and the mathematical equations for designing component parameters are conducted. Finally, a 90-W prototype circuit with three LED strings was built and tested. Experimental results show that the current in each LED string is indeed consistent. High power factor and low THDi can be achieved. LED power is regulated from 100% to 25% rated power. Satisfactory performance has proved the feasibility of this circuit.

scholarly journals Total Harmonic Distortion Oriented Finite Control Set Model Predictive Control for Single-Phase Inverters

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3467 ◽  
Author(s):  
Po Li ◽  
Ruiyu Li ◽  
Haifeng Feng
Keyword(s):  
Model Predictive Control ◽  
Cost Function ◽  
Predictive Control ◽  
Single Phase ◽  
Tracking Error ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Finite Control ◽  
Control Set ◽  
The Cost

Inverters are commonly controlled to generate AC current and Total Harmonic Distortion (THD) is the core index in judging the control effect. In this paper, a THD oriented Finite Control Set Model Predictive Control (FCS MPC) scheme is proposed for the single-phase inverter, where a optimization problem is solved to obtain the switching law for realization. Different from the traditional cost function, which focuses on the instantaneous deviation of amplitude between predictive current and its reference, we redesign a cost function that is the linear combination of the current fundamental tracking error, instantaneous THD value and DC component in one fundamental cycle (for 50 Hz, it is 0.02 s). Iterative method is developed for rapid calculation of this cost function. By choosing a switching state from a FCS to minimize the cost function, a FCS MPC is finally constructed. Simulation results in Matlab/Simulink and experimental results on rapid control prototype platform show the effect of this method. Analyses illustrate that, by choosing suitable weight of the cost function, the performance of this THD oriented FCS MPC method is better than the traditional one.

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.

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