Proceedings Article•
MSPWM & MTPWM techniques for asymmetric H-bridge multilevel inverter
30 Mar 2012-pp 501-504
TL;DR: This paper focuses on cascaded H-bridge multilevel inverter using two unequal dc sources in order to produce a seven level output and the performance evaluation of the proposed PWM strategies for single-phase multileVEL inverter is done using MATLAB and Total Harmonic Distortion (THD) is determined.
Abstract: Multilevel inverter is a new breed of power converter which is suited for high power applications. The various topologies of multilevel inverter are diode - clamped, capacitor clamped and cascaded H-bridge inverter. It is an effective solution for increasing the number of levels in output waveform with reduced dc sources and switching elements, thereby dramatically reduces harmonics without increasing the switching frequency and decreasing power output. It has emerged as an important alternative in the area of high power and medium voltage energy control. This paper focuses on cascaded H-bridge multilevel inverter using two unequal dc sources in order to produce a seven level output and this is implemented to produce a three- phase seven level output waveform. Various modulation methods are available for multilevel inverter, but this paper emphasis on Multiple Trapezoidal PWM (MTPWM) and Multiple Sinusoidal PWM (MSPWM) technique with triangular as carrier. The performance evaluation of the proposed PWM strategies for single-phase multilevel inverter is done using MATLAB and Total Harmonic Distortion (THD) is determined.
Citations
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Journal Article•
TL;DR: This paper presents ACMLI using fixed frequency level-shifted carrierbased PWM technique for three phase squirrel cage induction motor as a load and simulation results for this proposed scheme are shown.
Abstract: In this paper, a seven level asymmetrical cascaded H-Bridge multilevel inverter in three phase configuration using different level-shifted carrier-based pulse width modulation techniques is discussed. Multilevel inverters have become more popular due to high voltage and high power output applications. Comparable to traditional PWM inverters, multilevel inverters are able to reduced switching losses, low harmonic distortion and high-voltage capability with low costs. This paper presents ACMLI using fixed frequency level-shifted carrierbased PWM technique for three phase squirrel cage induction motor as a load. In this topology, two H-Bridges with 8-IGBT switches are used for getting seven level output voltage for each phase leg. Simulation using MATLAB-SIMULINK is done to verify the performance of the ACMLI using LSCPWM techniques. Simulation results for this proposed scheme are shown in this paper. General Terms Multilevel Inverter (MLI), Symmetrical Cascaded H-Bridge Multilevel Inverter (SCMLI), Asymmetrical Cascaded HBridge Multilevel Inverter (ACMLI).
8 citations
TL;DR: This paper provides a concise review on multilevel inverter and different levels of cascaded H-Bridge connection.
Abstract: In recent years power electronic converters are widely used in industrial as well as domestic applications for the control of power flow for automation and energy efficiency.Most of the time these converters draw harmonic current and reactive power from AC source and causes the power quality problems. Recently multilevel power conversion technology has been a very rapidly growing area of power electronics with good potential for further developments. For a multilevel inverter, switching angles at fundamental frequency are obtained by solving the selective harmonic elimination equations in such a way that the fundamental voltage is obtained as desired and certain lower order harmonics are eliminated. The most attractive applications of this technology are in the medium to high-voltage range. Multilevel inverters have many advantages such as low power dissipation on power switches, low harmonic and low electromagnetic interference (EMI) outputs. This paper provides a concise review on multilevel inverter and different levels of cascaded H-Bridge connection.
5 citations
23 Apr 2013
TL;DR: In this article, the dynamic of capacitors voltage of flying capacitor multilevel inverter (FCMI) based on sine-sawtooth phase shift carrier pulse width modulation (PSCPWM) is investigated.
Abstract: In this paper the dynamic of capacitors voltage of flying capacitor multilevel inverter (FCMI) based on sine-sawtooth phase shift carrier pulse width modulation (PSCPWM) is investigated. By using the double Fourier series of PWM, the double Fourier series of PSCPWM is achieved. In continuous by applying the double Fourier series of sine-sawtooth PSCPWM, the linear state space equations of capacitors voltage of FCMI are obtained. The result is presented as a state space matrix. The presented method of this paper allows that the changes of parameters such as modulation index, carrier frequency, load resistance and load inductance be analyzed and investigated by using powerful strategies such as root-locus. By simulation of FCMI operation in PSCAD/EMTDC software, the validity of theoretical analysis is proved.
3 citations
01 Jul 2016
TL;DR: The paper describes the different level in asymmetrical cascaded multilevel inverter using various level-shifted carrier-based PWM techniques and shows how Series and parallel combination of switches helps in reducing the semiconductor current and voltage rating.
Abstract: The paper describes the different level in asymmetrical cascaded multilevel inverter using various level-shifted carrier-based PWM techniques. And with Series and parallel combination of switches helps in reducing the semiconductor current and voltage rating. The laod taken is IM load. For different levels, No. of H Bridge are increased to get the desired result. Simulation technique that is MATLAB-SIMULINK we are using for verifying the performance of the asymmetrical cascaded multilevel using LSCPWM techniques.
1 citations
01 Jan 2014
TL;DR: In this article, various new hybrid PWM strategies for sine - trapezoidal reference with triangular carrier PWM signals are analyzed with the new symmetrical nine level inverter topology.
Abstract: In this paper various new hybrid PWM strategies for sine - trapezoidal reference with triangular carrier PWM signals are analyzed with the new symmetrical nine level inverter topology. This new multilevel level inverter uses only ten switches rather than conventional multilevel inverter uses sixteen switches for the same nine level output. The topology has many advantage s of less switching losses, converter cost and installation cost. The inverter is analysed with PWM strategies like PD, APOD and also with various new hybrid PWM strategies such as PD + VF, PD + CO, APOD + VF, APOD + CO, PD + VF + CO and APOD + VF + CO. Th e proposed multilevel inverter is investigated with these techniques in MATLAB/SIMULINK. The power quality issues such as Total Harmonics Distortion and Fundamental RMS voltages are analysed by comparing this strategy. As a result, the total harmonic disto rtion is lower in PD + VF PWM strategy and fundamental RMS voltage is higher in APOD + VF + CO PWM strategy.
References
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TL;DR: The most important topologies like diode-clamped inverter (neutral-point clamped), capacitor-Clamped (flying capacitor), and cascaded multicell with separate DC sources are presented and the circuit topology options are presented.
Abstract: Multilevel inverter technology has emerged recently as a very important alternative in the area of high-power medium-voltage energy control. This paper presents the most important topologies like diode-clamped inverter (neutral-point clamped), capacitor-clamped (flying capacitor), and cascaded multicell with separate DC sources. Emerging topologies like asymmetric hybrid cells and soft-switched multilevel inverters are also discussed. This paper also presents the most relevant control and modulation methods developed for this family of converters: multilevel sinusoidal pulsewidth modulation, multilevel selective harmonic elimination, and space-vector modulation. Special attention is dedicated to the latest and more relevant applications of these converters such as laminators, conveyor belts, and unified power-flow controllers. The need of an active front end at the input side for those inverters supplying regenerative loads is also discussed, and the circuit topology options are also presented. Finally, the peripherally developing areas such as high-voltage high-power devices and optical sensors and other opportunities for future development are addressed.
6,472 citations
"MSPWM & MTPWM techniques for asymme..." refers background in this paper
...The various topologies of multilevel inverter are diode - clamped, capacitor clamped and cascaded H-bridge inverter [1], [2]....
[...]
08 Oct 1995
TL;DR: This paper presents three multilevel voltage source converters: (1) diode-clamp, (2) flying-capacitors, and (3) cascaded-inverters with separate DC sources.
Abstract: Multilevel voltage source converters are emerging as a new breed of power converter options for high-power applications. The multilevel voltage source converters typically synthesize the staircase voltage wave from several levels of DC capacitor voltages. One of the major limitations of the multilevel converters is the voltage unbalance between different levels. The techniques to balance the voltage between different levels normally involve voltage clamping or capacitor charge control. There are several ways of implementing voltage balance in multilevel converters. Without considering the traditional magnetic coupled converters, this paper presents three recently developed multilevel voltage source converters: (1) diode-clamp, (2) flying-capacitors, and (3) cascaded-inverters with separate DC sources. The operating principle, features, constraints, and potential applications of these converters are discussed.
3,232 citations
"MSPWM & MTPWM techniques for asymme..." refers background in this paper
...The various topologies of multilevel inverter are diode - clamped, capacitor clamped and cascaded H-bridge inverter [1], [2]....
[...]
TL;DR: In this paper, a general structure for cascaded power converters is presented in which any number of H-bridge cells having any number voltage levels are series connected to form an inverter phase leg.
Abstract: In this paper, a general structure for cascaded power converters is presented in which any number of H-bridge cells having any number of voltage levels are series connected to form an inverter phase leg. Equations are introduced for determining an optimal voltage ratio of DC voltages for the H-bridge cells which will maximize the number of voltage levels obtainable resulting in high power quality. Special cases of the generalized inverter are presented including novel 11-level and 15-level inverters. Laboratory measurements demonstrate the proposed inverter performance.
348 citations
18 Jun 2006
TL;DR: In this article, a hybrid cascaded H-bridge multilevel motor drive control scheme for electric/hybrid electric vehicles where each phase of a three-phase cascaded multi-level converter can be implemented using only a single DC source and capacitors for the other DC sources is presented.
Abstract: This paper presents a hybrid cascaded H-bridge multilevel motor drive control scheme for electric/hybrid electric vehicles where each phase of a three-phase cascaded multilevel converter can be implemented using only a single DC source and capacitors for the other DC sources. Traditionally, each phase of a three-phase cascaded multilevel converter requires n DC sources for 2n + 1 output voltage levels. In this paper, a scheme is proposed that allows the use of a single DC source as the first DC source with the remaining n − 1 DC sources being capacitors. It is shown that a simple 7-level equal step output voltage switching control can simultaneously maintain the balance of DC voltage levels of the capacitors, eliminate specified low order non-triplen harmonics, and produce a nearly sinusoidal three-phase output voltage. This scheme therefore provides the capability to produce higher voltages at higher speeds (where they are needed) with a low switching frequency method for motor drive application, which has inherent low switching losses and high conversion efficiency. This control scheme especially fits fuel cell electric vehicle motor drive applications and hybrid electric vehicle motor drive applications.
96 citations
05 Nov 2002
TL;DR: In this article, the authors proposed an adapted optimal control strategy based on a geometrical approach, and a scheme for the control of multi-level inverters, which can reduce the number of commutations and hence the switching losses.
Abstract: This paper deals with asymmetrical multi-level inverters. The investigated topologies consist of series connected cells with different input voltages. Some combinations of different input voltages have been proposed to improve the converter resolution. This paper has a general approach. It describes the rules to obtain a uniform step with these topologies. It points out the switching problem of some of these asymmetrical solutions, describes the rules to avoid this problem, resulting in a solution where the number of commutations and hence the switching losses may be reduced. For this purpose, it also proposes an adapted optimal control strategy based on a geometrical approach, and a scheme for the control of multi-level inverters.
95 citations