scholarly journals Active voltage balancing strategy of asymmetric stacked multilevel inverter

2021 ◽  
Vol 23 (2) ◽  
pp. 665
Author(s):  
Mostafa Q. Kasim ◽  
Raaed F. Hassan
Keyword(s):  
Steady State ◽  
Harmonic Distortion ◽  
Reference Value ◽  
Multilevel Inverter ◽  
Voltage Balancing ◽  
Medium Voltage ◽  
Multilevel Inverters ◽  
Modulation Techniques ◽  
And Control ◽  
Fast Dynamic

Multilevel inverters (MLI) play an important role in AC applications and are undergoing continuous development in topology and control. In higher levels inverters, conventional MLIs have high components count which calls for modification of these topologies to obtain the same number of levels with fewer components to reduce cost and size. Balancing of the capacitors voltages is crucial for the operation of the MLI and it becomes more challenging in higher levels. This paper presents an active voltage balancing strategy for a reduced switch count five-leve topology which is the asymmetric stacked multilevel inverter (ASMLI). The ASMLI uses fewer components than the conventional MLIs when used in their five-levelconfiguration. The proposed active voltage balancing strategy uses simple measurements and logic to assure a balanced capacitors voltages during steady state and transients. The performance was examined and compared based on two modulation techniques with LCL filter and RL load using MATLAB/Simulink. The results show that the active voltage balancing strategy can trace all capacitors voltages to the reference value simultaneously with less than 1% voltage error, fast dynamic response, and an acceptable total harmonic distortion (THD) which allows the proposed setup to be an available option for medium voltage applications.<br /><div> </div>

scholarly journals Performance evaluation and comparison of diode clamped multilevel inverter and hybrid inverter based on PD and APOD modulation techniques

2019 ◽  
Vol 8 (2) ◽  
pp. 143
Author(s):  
N. Susheela ◽  
P. Satish Kumar
Keyword(s):  
Pulse Width ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Multilevel Inverters ◽  
Number Of Components ◽  
Modulation Techniques ◽  
Modulation Methods

<p>The popularity of multilevel inverters have increasing over the years in various applications without use of a transformer and has many benefits. This work presents the performance and comparative analysis of single phase diode clamped multilevel inverter and a hybrid inverter with reduced number of components. As there are some drawbacks of diode clamped multilevel inverter such as requiring higher number of components, PWM control method is complex and capacitor voltage balancing problem, an implementation of hybrid inverter that requires fewer components and less carrier signals when compared to conventional multilevel inverters is discussed. The performance of single phase diode clamped multilevel inverter and hybrid multilevel inverter for seven, nine and eleven levels is performed using phase disposition, alternate phase opposition disposition sinusoidal pulse width modulation techniques. Both the multilevel inverter are implemented for the above mentioned multicarrier based Pulse Width Modulation methods for R and R-L loads.  The total harmonic distortion is evaluated at various modulation indices. The analysis of the multilevel inverters is done by simulation in matlab / simulink environment.</p>

scholarly journals Reduced Switch Multilevel Inverter Topologies And Modulation Techniques For Renewable Energy Applications

2021 ◽  
Vol 12 (3) ◽  
pp. 4659-4670
Author(s):  
Ujwala Gajula Et.al
Keyword(s):  
Renewable Energy ◽  
Renewable Energy Sources ◽  
Harmonic Distortion ◽  
Power Converter ◽  
Multilevel Inverter ◽  
Medium Voltage ◽  
Multilevel Inverters ◽  
Energy Applications ◽  
Converter Topology ◽  
Overall Performance

Multilevel inverters (MLIs) have been extensively used and gained interest over last few decades in industrial and grid connected renewable energy applications because of its numerous merits. Besides various advantages like obtaining reduced harmonic distortion and lesser dv/dt stress across switches it has the capability of generating any number of levels. The theory of multilevel concept was initiated for high power and high/medium voltage applications as they are helpful in interfacing with renewable energy sources. By proper combination of the switches it generates a stair case output with reduced harmonic distortion because of this MLI is widely used and it became one of the advanced power converter topology. The rise of new topologies has attained importance over conventional multilevel inverter topologies, which generates more number of levels with reduced switch components. This paper presents various conventional MLI topologies and hybrid MLI topologies for renewable energy applications. Also, this review paper includes different modulation strategies which plays an important role to improve the overall performance of MLI.

Performance Analysis of Cascade H-Bridge Multilevel Inverter Topology With Filter Circuit and Without Filter Circuit

2020 ◽  
pp. 87-101
Author(s):  
Nikhil Agrawal
Keyword(s):  
Performance Analysis ◽  
High Power ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Total Harmonic Distortion ◽  
Medium Voltage ◽  
Number Of Components ◽  
Modulation Techniques ◽  
Driver Circuit ◽  
Inverter Topology

Multilevel inverter is a modified version of inverter. Multilevel inverter recently emerged in the area of high power and medium voltage application. In the last few decades, the great innovation has been done to improve the inverter performance, and it is challenging even today. The multilevel inverter performance is examined by total harmonic distortion and component required. In multilevel, as level increases, the total harmonic distortion value decreases, but the number of components required and driver circuit increases that make the circuit more complex and also the effect on cost. So, the challenge is to balance the bridge between cost and total harmonic distortion. This chapter simulates the various levels of conventional cascade H-bridge inverter and new proposed topology of multilevel inverter with using different modulation techniques and with using filter circuit and without filter circuit.

scholarly journals Comparative Analysis of Carrier based techniques for Single phase Diode Clamped MLI and Hybrid inverter with reduced components

2017 ◽  
Vol 7 (3) ◽  
pp. 687
Author(s):  
Nunsavath Susheela
Keyword(s):  
Single Phase ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Harmonic Distortion ◽  
Low Frequency ◽  
Multilevel Inverter ◽  
Voltage Balancing ◽  
Multilevel Inverters ◽  
The Comparative Study ◽  
Sinusoidal Pulse Width Modulation

<p>The multilevel inverters have highly desirable characteristics in high power high voltage applications. The multilevel inverter was started first with diode clamped multilevel inverter. Later, various configurations have been came into existence for many applications. However the multilevel inverters have some demerits such as requiring higher number of components, PWM control method is complex and capacitor voltage balancing problem. The hybrid multilevel inverter presented in this paper has superior characteristics over conventional multilevel inverters. The hybrid multilevel inverter employs fewer components and less carrier signals when compared to conventional multilevel inverters. It consists of level generation and polarity generation stages which involves high frequency and low frequency switches. The complexity and overall cost for higher output voltage levels are greatly reduced. Implementation of single phase 7-level, 9-level and 11-level diode clamped multilevel inverter and hybrid multilevel inverter has been performed using sinusoidal pulse width modulation (SPWM) strategies i.e., phase disposition (PD), alternate phase opposition disposition (APOD). Also these techniques are compared in terms of total harmonic distortion (THD) for various modulation indices and observed to be greatly improved in case of hybrid inverter when compared to diode clamped inverter. The comparative study of performance for single phase diode clamped multilevel inverter and hybrid inverter is analyzed with different loads.  Simulation is performed using MATLAB/ SIMULINK. </p>

A Review on Voltage Balancing Solutions in Multilevel Inverters

2015 ◽  
Vol 1 (1) ◽  
pp. 53
Author(s):  
M. Ranjitha ◽  
S. Ravivarman
Keyword(s):  
Renewable Energy ◽  
High Power ◽  
Multilevel Inverter ◽  
Capacitor Discharge ◽  
Voltage Balancing ◽  
Medium Voltage ◽  
Multilevel Inverters ◽  
Voltage Balance

<p>Multilevel inverters are used in high power and medium voltage applications. Employing multilevel inverter with renewable energy alone, the voltage balance cannot be made because the number of level increases in multilevel inverter the control gets complexity. So voltage imbalance problems are introduced. The voltage imbalance problems can be classified into two types; Midpoint unbalance and the central capacitor discharge. These problems can be solved by using voltage balancing solutions. The solutions are hardware based; software based, and combined solutions. By using these types of solutions the voltage balancing problems can be solved and the efficiency of multilevel inverter could be high. This paper reviews about various voltage balancing solutions in multilevel inverter.<strong></strong></p>

scholarly journals GA Based Selective Harmonic Elimination for Multilevel Inverter with Reduced Number of Switches: An Experimental Study

2019 ◽  
Vol 25 (3) ◽  
pp. 10-17
Author(s):  
Enes Bektas ◽  
Hulusi Karaca
Keyword(s):  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Power Electronic ◽  
Load Voltage ◽  
Medium Voltage ◽  
Multilevel Inverters ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Power Switches ◽  
First Time

In power electronic applications, especially high power and medium voltage, multilevel inverters (MLIs) have been commonly used. MLIs ensure high quality load voltage and lower Total Harmonic Distortion (THD) than traditional inverter. In this paper, a multilevel inverter structure with reduced number of power switches is proposed. The proposed multilevel inverter is lower costed than conventional MLI. Also, a Genetic Algorithm (GA) based Selective Harmonic Elimination (SHE) technique has been used for the first time in the proposed MLI structure with reduced number of switches. The proposed GA based SHE technique computes the optimum switching angles by solving nonlinear harmonic equations of multilevel inverter. Both Isochronous switching (IS) and SHE techniques have been applied to proposed MLI to demonstrate the effectiveness of the GA based SHE technique. Simulation and experimental results for 7, 11 and 13-level have been obtained. Results of 11-level inverter is analysed and given in detail. Results have clearly proved that desired order harmonics in proposed MLI topology can be eliminated by using GA based SHE technique and lower THD on the load voltage has been provided.

scholarly journals Performance Examination of SEPIC Based Hybrid Cascaded Single-Phase Multilevel Inverter

2019 ◽  
Vol 9 (2) ◽  
pp. 3644-3648
Keyword(s):  
Steady State ◽  
Single Phase ◽  
Multilevel Inverter ◽  
Passive Components ◽  
Voltage Balancing ◽  
Multilevel Inverters ◽  
Capacitor Voltage ◽  
Performance Examination ◽  
Transportation Applications ◽  
Complete Operation

In the present scenario, reduced part count(RPC) multilevel inverters are become popular compared to traditional multilevel inverters(MLIs). This is mainly due to reduced size and cost and alleviates the issues of more passive components, flying capacitor voltage balancing issues and the requirement of complex switching schemes. Also, the RPC is getting attraction for various industrial and transportation applications. Therefore, in this paper, a novel 17 level inverter is proposed by cascading MLIs with the reduced part count. The complete operation, switching schemes and output are presented to evolve the performance under steady-state conditions using MATLAB software.

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.

A Comparative Studies of Cascaded Multilevel Inverters Having Reduced Number of Switches with R and RL-Load

2017 ◽  
Vol 8 (1) ◽  
pp. 40
Author(s):  
Lipika Nanda ◽  
Abhijit Dasgupta ◽  
Ullash Kumar Rout
Keyword(s):  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Power Sources ◽  
Multilevel Inverters ◽  
Switching Losses ◽  
Dc Power ◽  
Modulation Techniques ◽  
Power Application ◽  
Cascaded Multilevel Inverter

<p>Multilevel inverter offers many benefits for high power application compavered to conventional cascaded Multilevel Inverter topology.This paper presents Symmetric CMLI using variable frequency carrier based pulse width modulation techniques. The proposed topology reduces total harmonic distortion and reduced switching losses for seven level inverter. The simulation study of the proposed topology has been carried out in MATLAB/SIMULINK. The main objective of this paper is to achieve number of levels of MLI with reduced number of switches and DC power sources compared to conventional topology.</p>

scholarly journals An Effective Pulse Width Modulation Technique Analysis for CHB Multilevel Inverters

2020 ◽  
pp. 133-137
Author(s):  
Vivekanandan S ◽  
Vignesh C J ◽  
Kamalkumar V ◽  
Balamurugan K
Keyword(s):  
Output Signal ◽  
Pulse Width ◽  
Industrial Revolution ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Harmonic Distortion ◽  
Control Technique ◽  
Medium Voltage ◽  
Multilevel Inverters ◽  
Modulation Techniques

This paper narrates the pulse width modulation techniques used in the multilevel inverters (MLIs). In the recent industrial revolution era, MLIs found in medium voltage high power applications especially in drives domain. The control technique employed in the MLIs decides the effective conversion of power in the circuit. The harmonic content present in the output signal will lead to the performance changes in the load side. This is indicated as measure of total harmonic distortion (THD). The output signal from MLIs is fewer harmonic when the number of levels is high without any filtering process. In addition, the control method of MLIs decides the effectiveness of the system and calculating the THD. There are different types of control methods employed in the MLIs in the various literatures. Each method differs from its benefits and suitable for driving the inverter switches for a particular application. The working of each models was discussed in detail. The models are created in MATLAB/Simulink platform and analyzed its effectiveness.

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