Query: Multilevel inverter designing

Candidate papers:

abstract: Multilevel inverter (MLI) plays a crucial role in medium voltage and high power applications. While the usages of MLIs are continuously growing in every area of power industries, it also initiates certain challenges that require attention. The increased number of power electronic components is one of the most challenging issues for multilevel inverters. The output power quality and the semiconductor device ratings of the grid connected high power inverters are largely dependent on the number of power components. Thus, it is required to decrease the overall power components as much as possible while designing these inverters. Therefore, this paper proposes a single phase 7 level cross switched multilevel inverter that can produce higher voltages utilizing lesser power components. In order to further improve the efficiency of this MLI and enhancing its performance, selective harmonic elimination pulse width modulation (SHE PWM) control technique is implemented. Here, Newton Raphson algorithm is examined to calculate the switching angles for different modulation indices. The fundamental voltage is obtained by solving the equations in such a way that the desired low order harmonics are eliminated. MATLAB Simulink software has been used to perform the simulation while the hardware model was implemented using digital signal processor eZdsp528335.
author_names: Sheikh Tanzim Meraj

Arsalan Ahmed

Law Kah Haw

Adeel Arif

Ammar Masaoud
title: DSP Based Implementation of SHE PWM For Cross Switched Multilevel Inverter
venue: 2019 IEEE 15th International Colloquium on Signal Processing Its Applications (CSPA)
year: 2019

abstract: Among the renewable energy applications, the most popular inverters are cascaded multilevel inverters. Irrespective of numerous benefits these inverters face reliability issues due to the presence of more circuit components in the design. This has been a critical challenge for researchers in designing inverters with enhanced reliability by reducing the total harmonic distortion (THD) This paper proposes a 31 level asymmetric cascaded multilevel inverter for renewable energy applications. The proposed topology produces waveforms consisting of the staircase with a high number of output levels with lesser components with low THD. The investigations on the feasibility and performance of MLI under steady state, transient, and dynamic load disturbances. The results are validated from a 1.6kW system which provides the proposed inverter.
author_names: C Dhanamjayulu

G Arunkumar

B Jaganatha Pandian

C V Ravi Kumar

M Praveen Kumar

A Rini Ann Jerin

P Venugopal
title: Real Time Implementation of a 31 Level Asymmetrical Cascaded Multilevel Inverter for Dynamic Loads
venue: IEEE Access
year: 2019

abstract: Within this paper, a brand new single phase cascaded multilevel inverter is suggested. This inverter is composed of a set connection from the suggested fundamental unit and has the capacity to only generate positive levels in the output. Therefore, an Hbridge is put into the suggested inverter. Decrease in the amount of power switches, driver circuits, and electricity current sources are the benefit of the developed single phase cascaded multilevel inverter. Consequently, cellular phone space and price from the inverter are reduced. These functions are acquired through the comparison from the conventional cascaded multilevel inverters using the suggested cascaded topology.
author_names: K Anil Kumar

V Mahender
title: Designing of an Efficient Single Phase Cascaded Multilevel Inverter
year: 2016

abstract: Mathematical modeling also gives the information about designing of controller. The analysis and different application of PUC inverter such as inverter, rectifier, STATCOM and voltage controllers are given here. A brief review on PUC inverter for single phase operation, mathematical modeling and switching scheme is also presented. It has been shown that PUC inverter topology is preferable than the conventional multilevel inverter in terms of device counts.
author_names: Abdullahil Azeem

Mohd Tariq

Mahetab Alam

Chokkalingam Bharatiraja
title: Review, Design and Mathematical Modeling of Packed U Cell Multilevel Inverter
year: 2019

abstract: Nowadays, more research projects have described a converter that is widely used at the distributed generation (DG) level in order to increase the amount of electrical power generation. The converter is known as an inverter when only one DG source is used or as a multi inverter when several DGs are used. Here, the application of a multilevel inverter with a C2000 microcontroller (Texas Instruments (TI) TMS320F28335 microcontroller) which can be implemented with a current feedback loop, is investigated. This microcontroller acts as a communication interface between MATLAB SIMULINK and the multilevel inverter. Meanwhile, the current control model is modeled in MATLAB for designing the control strategy. It is where the multilevel inverter switches are triggered by using pulse width modulation (PWM) signals generated by the microcontroller output. At the same time, the proportional integral derivative (PID) current control is used in order to allow the load current to follow the reference current. Based on the results, it can be summarized that the multilevel inverter is a very useful device for the next DG sources when it is combined with current control for load current distribution. From this investigation, it can be seen that in the future DGs could be connected to a multilevel inverter structure, where it will reduce the dependency on filter design and have a more sinusoidal output to the load for different DG power ratings.
author_names: Shamsul Aizam Zulkifli

Epha Yusriyanna Riyandra

Suriana Salimin

Ahmed Naji Zaidan

Ronald Jackson
title: Investigation of Multilevel Inverter for the Next Distributed Generation Using Low Cost Microcontroller
year: 2019

abstract: This paper introduces a novel three phase hybrid multilevel inverter (MLI) The presented structure consists of two sections, named as a basic module and auxiliary unit. Cascade connection of basic modules contributes to an augment in the number of generated output level while the auxiliary unit helps to double it. In this paper, high and low frequency switching techniques are applied to synthesize the converter AC side voltage waveform. The fundamental frequency strategy is employed as a low frequency technique, and also multicarrier level shifted sinusoidal pulse width modulation (LSPWM) is applied as a high frequency modulation method. Since the number of semiconductor components against the number of generated output levels is an essential factor in designing MLIs, the proposed circuit is compared with the conventional inverters to show the merits of the new topology. Simulation is performed in MATLAB/SIMULINK to ensure the feasibility and performance of the proposed topology.
author_names: Mahyar Hassanifar

Reza Choupan

Daryoush Nazarpour

Yousef Neyshabouri

Sajjad Golshannavaz
title: Study and Analysis of a Novel Three Phase Hybrid Cascaded Multilevel Inverter with Less Number of Power Electronic Switches
venue: 2019 11th International Conference on Electrical and Electronics Engineering (ELECO)
year: 2019

abstract: The cascaded H bridge multilevel inverter (CMI) is one of the most popular converters, especially in renewabale energy applications. Beyond offering some significant benefits, this inverter suffers from the drawback of employing great number of components which reduces the reliability of the inverter. Thus, designing a scheme to enhance reliability in this kind of inverter is of crucial importance. In this paper, a fault tolerant structure for the cascaded H bridge multilevel inverter is designed. Failure rates of the switches and diodes are calculated. Then, by using the Markov method, reliability and mean time to failure (MTTF) of the mentioned inverter, before and after employing the suggested scheme, are evaluated. In order to prove proper performance of the suggested scheme, a laboratory built prototype is employed. The results show that employing the suggested scheme significantly enhances reliability and MTTF of the inverter.
author_names: Hossein Khoun Jahan

Farhad Panahandeh

Mehdi Abapour

Sajjad Tohidi
title: Reconfigurable Multilevel Inverter With Fault Tolerant Ability
venue: IEEE Transactions on Power Electronics
year: 2018

abstract: A novel multilevel inverter (MLI) structure is introduced in this paper. Since one of the crucial factors in designing and usability of an MLIs is the ratio of the total number of semiconductor devices to the output voltage levels, this ratio is reduced in the proposed structure in comparison to the conventional MLIs. The less utilized devices mean, the lower the cost of implementation, size of the system, required installation area, control complexity, and also higher reliability. The proposed structure is modular and can operate in two modes (symmetric and asymmetric) which are discussed in this paper. To express the worthiness of the presented structure, a comparison with the conventional cascade H bridge MLI is presented. Also, the nearest level control (NLC) switching technique is applied to generate the output voltage waveform. The computer aided simulation is made to prove the feasibility and performance of the suggested structure. The analytical results are carried out by the Simulink of MATLAB.
author_names: Reza Choupan

Mahyar Hassanifar

Sajjad Golshannavaz

Yousef Neyshabouri

Daryoush Nazarpour
title: Design of a New Single Phase Multilevel Voltage Source Inverter Based on Series Connection of Basic Units
venue: 2019 11th International Conference on Electrical and Electronics Engineering (ELECO)
year: 2019

abstract: During the process of designing a multilevel inverter significant effort is taken to reduce the harmonic content of the output. In recent years utilization of mathematical optimization algorithms for Selective harmonic elimination (SHE) in the multilevel inverter output has emerged as a much favored procedure among the engineering community. A special class of algorithms called metaheuristic algorithms is now being widely used for this purpose. This paper used four different metaheuristic methods for solving the nonlinear transcendental equation of SHE problem of a seven level cascaded H bridge inverter. A comparative study was carried out to measure the effectiveness of each method through rigorous simulation. The efficacious of each algorithm was assessed in terms of the total harmonic distortion in the optimized inverter output obtained after applying the algorithm. The four optimization used in this paper are simulated annealing, bacterial foraging, firefly and cuckoo algorithms. The following research concluded that cuckoo algorithm gave the lowest THD for the multilevel inverter.
author_names: Kodumur Meesala Ravi Eswar
title: Implementing Selective Harmonic Elimination in Cascaded Multilevel Inverter Using Different Metaheuristic Optimization Methods and Comparing Their Effectiveness
year: 2018

abstract: Single phase fifteen level and sixty three level modular multilevel inverter with reduced number of power electronic switches for solar photovoltaic application is presented. Modular Multilevel Converter (MMC) is used in designing both control and power circuits to provide the corresponding output voltage levels by suitable switching sequences. To achieve 15 level inverter, the conventional method requires 28 switches and in binary mode 12 switches are needed. In Existing MMC 7 switches and 3 Sources are employed to achieve 15 levels. In proposed system with only 9 switches and 5 sources are employed to achieve 63 levels output voltages with decreased Total Harmonic Distortion. The simulation of fifteen level and sixty three level modular multilevel inverter is done using MATLAB and Total Harmonic Distortion is Analysed for both the inverters.
author_names: P Ganesh

N Shanmugavadivu

Kr Santha
title: Single Phase 63 Level Modular Multilevel Inverter fed Induction Motor Drive for Solar PV Applications
venue: 2018 4th International Conference on Electrical Energy Systems (ICEES)
year: 2018