Query: Multi-level topology evaluation for ultraefficient three-phase inverters

Candidate papers:

abstract: Multi level topologies reduce the requirements on inductors and filters, however, given the high number of series connected semiconductors, it is still unclear if they are a suitable option to achieve ultra high efficiency while maintaining a reasonable power density. For this purpose, an extensive quantitative evaluation of different topologies is carried out, to determine the required volume for a targeted 99.5% efficiency of a 10kW three phase inverter. This includes the EMI noise filtering, where the Common Mode filter is placed on the DC side to save losses and the impact of the upcoming EMI regulations covering the range from 2 kHz to 150 kHz is discussed. With an evaluation of multilevel topologies, it is shown that even if a high number of levels can reduce the size of the magnetic components by an order of magnitude, the volume and losses of the capacitive components required to create the multi level voltage output have to be considered. An evaluation is done to quantify the performance of topologies ranging from two level to seven level topologies, and detailed designs of the three level T type and seven level Hybrid Active Neutral Point Clamped converters are presented, achieving a relatively high power density of 2.2 kW/dm3 and 2.7 kW/dm3 respectively.
author_names: Jon Azurza Anderson

Lukas Schrittwieser

Michael Leibl

Johann Walter Kolar
title: Multi level topology evaluation for ultra efficient three phase inverters
venue: 2017 IEEE International Telecommunications Energy Conference (INTELEC)
year: 2017

abstract: A more suitable model of multi level inverter with fault tolerant ability is studied and analyzed in this paper. Here, an accurate comparative evaluation can adduce evidence of the multi level inverter with the traditional cascade inverter for solar water pumping systems is conferred. The modified multilevel inverter which is proposed helps in minimizing the number of gate drivers and switch count compared to other genre of multilevel inverters. A level shifted multi carrier PWM is the technique used for the proposed system. For the meticulous analysis, the suggested five level and the present 5 level inverters are built using MATLAB platform. And naturally the topology that has been designed accomplished well while in comparison to the conventional. In order to state the feasibility of the recommendeda simulation analysis is accomplished and varied results are presented.
author_names: M Narasimha Rao

N K Karthick

A Madhukar Rao
title: Fault Tolerant Ability of A Multi Level Inverter Fed Three Phase Induction Motor for Water Pumping Application
venue: 2021 7th International Conference on Electrical Energy Systems (ICEES)
year: 2021

abstract: In recent years, multilevel inverters are becoming more popular for high power and high voltage application. Due to their improved harmonic profile and increased power ratings. Many studies have been reported in the literature on multilevel inverters topologies, control techniques, and applications. However, there are few studies that actually discuss or evaluate the performance of induction motor drives associated with three phase multilevel inverter. This paper presents a comparison study for a cascaded Hbridge multilevel direct torque control (DTC) induction motor drive. In this case, symmetrical and asymmetrical arrangements of fiveand seven level Hbridge inverters are compared in order to find an optimum arrangement with lower switching losses and optimized output voltage quality. Simulation results are proposed by using MATLAB/SIMULINK model.
author_names: Lanka Srinu

M Kondalu

Ganta Naveen

A Pavan Kumar
title: COMPARISON STUDY OF THREE PHASE CASCADED H BRIDGE MULTI LEVEL INVERTER BY USING DTC INDUCTION MOTOR DRIVES
year: 2014

abstract: This paper proposes a new PWM generation scheme for the three phase five level cascaded multilevel inverter. The main objective of this paper to improve the power quality by using various multi carrier PWM methods. Generally multi carrier based methods have been used widely for switching of multilevel inverters due to their simplicity, flexibility and reduced computational requirements compared to Space Vector Modulation (SVM) techniques. Several multi carrier modulation methods with miscellaneous properties have been already known. While evaluating and comparing these methods, such as PD, POD and APOD through measures like total harmonic distortion (THD) the paper shows their advantages for applications of Cascade multi level topologies by simulation results. Finally simulation results and experimental results are discussed.
author_names: P V Vivek

J Nanda Gopal

V Vignesh

T Vigneshwaran
title: A novel approach on power quality improvement by multi carrier multilevel inverter topology
venue: 2016 3rd International Conference on Electrical Energy Systems (ICEES)
year: 2016

abstract: Latest research results on three phase wide bandgap (WBG) inverter systems with full sinewave output voltage filtering are reported. A new soft switching modulation scheme for two level 1200 V SiC inverters is described. Furthermore, a new Figure of Merit for determining maximum multi level (ML) bridge leg efficiency is defined and low voltage GaN devices are evaluated considering ML flying capacitor (FC) and multi cell inverter structures. Finally, new integrated filter buck boost current DC link inverter topologies are discussed.
author_names: Johann Walter Kolar

Jon Azurza Anderson

Spasoje Miric

Michael Haider

Mattia Guacci

Michael Antivachis

Grayson D Zulauf

David Menzi

Pascal S Niklaus

Johann Minibock

Panteleimon Papamanolis

Gwendolin Rohner

Neha Nain

Davide Cittanti

Dominik Bortis
title: Application of WBG Power Devices in Future 3 Ph Variable Speed Drive Inverter Systems "How to Handle a Double Edged Sword"
venue: 2020 IEEE International Electron Devices Meeting (IEDM)
year: 2020

abstract: This paper presents a comprehensive analysis of the 5 phase induction motor driven by voltage source inverter drives and particularly its steady state performance evaluation. The performance of various modulation methods are analyzed with insightful look into their harmonic content and torque ripple. Three separate methods are proposed to reduce the torque ripple for low, middle and high modulation index regions while eliminating or controlling the non torque producing harmonics within the current machine rating. A complete set of simulations are carried out to verify the concepts and proposed methods. The multi level multiphase topology is introduced and it is compared to the two level system. The modification of switching sequence for reduction of torque ripple is applied to the three level 5 phase motor drive. Application of the multilevel multi phase concept to high power motor drives (as well as motor design and selection) is discussed.
author_names: Shuai Lu

Keith A Corzine
title: Multilevel multi phase propulsion drives
venue: IEEE Electric Ship Technologies Symposium, 2005.
year: 2005

abstract: The multi level inverter system is habitually exploited in AC drives, when both reduced harmonic contents and high power are required. In this paper, a new topology for three phase asymmetrical multilevel inverter employing reduced number of switches is introduced. With less number of switches, the cost, space and weight of the circuit are automatically reduced. This paper discusses the new topology, the switching strategies and the operational principles of the chosen inverter. Simulation is carried out using MATLAB SIMULINK. Various conventional PWM techniques that are appropriate to the chosen circuit such as PDPWM, PODPWM, APODPWM, VFPWM and COPWM are employed in this work. COPWM technique affords the less THD value and also affords a higher fundamental RMS output voltage.
author_names: Chinnapettai Ramalingam Balamurugan

Sirukarumbur Pandurangan Natarajan

T S Anandhi
title: Performance Evaluation of 3Ph Asymmetrical MLI with Reduced Switch Count
year: 2016

abstract: Multilevel inverters have received more attentions their considerable advantages such as high power quality, lower harmonic components, better electro magnetic consistence, lower dv/dt and lower switching losses. Lot of research was going on multi level inverter topologies and many researchers are proposed so many multi level inverter topologies. This paper proposes a robust adaptive voltage control of three phase voltage source inverter for a distributed generation system in a standalone operation. The proposed adaptive voltage control technique combines an adaption control term and a state feedback control term. The proposed algorithm is easy to implement, but it is very robust to system uncertainties and sudden load disturbances. With the proposed system, we can achieve fast transient response, zero steady state error, and low THD.Mathematical modeling and simulation studies using Simpower systems Block set of MATLAB are proposed. Switching scheme for the proposed converter circuit is designed with the help of sinusoidal pulse width modulation scheme. Total Harmonic distortion in the output voltage is evaluated using FFT tool of MATLAB SIMULINK. Keywords: Adaptive voltage control; distributed generation system (DGS) robust control; stability analysis; standalone operation; uncertainties; voltage source inverter.
author_names: Valluri Chandra Sekhar

S Raj Shekar
title: Adaptive Voltage Control of a 3 Phase Inverter for a Standalone Distributed Generation
year: 2016

abstract: In this paper a new three phase, five level inverter topology with a single dc source Multi level inverter based Dynamic Voltage Restorer (DVR) is presented to improve the Power quality in distribution system by injecting voltage in series for the protection of sensitive loads against voltage sags and voltage swells. The performance of the DVR depends on control technique involved .In this paper fuzzy logic controller is used to control the injection of voltage when the fault occurs. Among the Power quality issues voltage sags and voltage Swells are major problems which are concentrated in this paper. The DVR injects the voltage by Multi level inverter which converts dc voltage in the Energy Storage System (ESS) into ac and the amount of the injection of voltage is controlled by the fuzzy logic controller. Simulation results are presented to illustrate and understand the performances of DVR in supporting load voltage by the waveforms of load voltage without DVR and with DVR. To evaluate the quality of the load voltage during the operation of DVR, Total Harmonic Distortion (THD) is calculated. Keywords Dynamic Voltage Restorer, Energy storage System, Total Harmonic Distortion, Fuzzy Logic Controller, Multi Level Inverter.
author_names: P Anitha Rani
title: Improvement of Power Quality using DVR in Distribution Systems
year: 2014

abstract: Variable speed electric propulsion motors are operated from a variable frequency drive (VFD) which supplies power to motors at a frequency appropriate to the desired speed. These VFD's are normally very heavy and large in size. A variety of designs are commercially available but they have characteristics unsuitable for ship applications. The objective of this study was to evaluate various options for shipboard applications and to recommend designs that meet navy performance, weight and size constraints. It is possible to dramatically reduce the size and weight of the VFD by optimizing the VFD and the motor as a system, utilizing an optimal distribution voltage, eliminating distribution frequency transformers, and utilizing the weight and size reductions available with liquid cooling. Three systems were studied in detail: cycloconverters, series connected low voltage inverters, and multi level medium voltage inverters using 6 kV class IGBT's or similar switching devices. On the basis of this evaluation, a multi level diode clamped pulse width modulated (PWM) drive topology is recommended for navy ships. A three phase distribution voltage of 6 to 9 kV RMS minimizes the number of series semiconductors and control complexities of the drive.
author_names: David James Gritter

Swarn S Kalsi

N Henderson
title: Variable speed electric drive options for electric ships
venue: IEEE Electric Ship Technologies Symposium, 2005.
year: 2005