A new multilevel inverter topology with reduced number of power switches
01 Dec 2012-pp 55-59
TL;DR: In this paper, a new structure of a nine-level inverter is proposed to improve the multilevel inverter performance by compensating the disadvantages of the number of power switches.
Abstract: Recent years have seen the emergence of various multilevel inverter topologies for high voltage and high power applications. This is mainly due to the attractive advantages of multilevel inverters such as lower Total Harmonic Distortion (THD) in the output voltage, higher efficiency, less stress on the power switches and low Electromagnetic Interference (EMI). The main problem of using multilevel inverters is the number of power switches that normally contributes to the complexity in controlling the power switches and high cost. In this paper a new structure of a nine-level inverter is proposed to improve the multilevel inverter performance by compensating these disadvantages. This topology employs fewer power switches compared to that of conventional multilevel inverters. In addition a modified Pulse width Modulation (PWM) control method has been designed for this new inverter structure that requires less number of carrier signals. The proposed topology and its control method are described and the results of a simulation study conducted have illustrated the performance of the overall system, thus revealing the advantages of this structure compared to conventional topologies.
Citations
More filters
01 Jan 1992
TL;DR: In this paper, a multilevel commutation cell is introduced for high-voltage power conversion, which can be applied to either choppers or voltage-source inverters and generalized to any number of switches.
Abstract: The authors discuss high-voltage power conversion. Conventional series connection and three-level voltage source inverter techniques are reviewed and compared. A novel versatile multilevel commutation cell is introduced: it is shown that this topology is safer and more simple to control, and delivers purer output waveforms. The authors show how this technique can be applied to either choppers or voltage-source inverters and generalized to any number of switches.<>
1,202 citations
TL;DR: A comprehensive review of some of the recently proposed newer multilevel inverter topologies with an objective of reducing power semiconductor device count, gate drivers and/or isolated DC sources with the abovementioned objectives is presented.
Abstract: Multilevel Inverters (MLIs) are becoming more and more popular in medium and high power applications. This is due to several inherent advantages of MLI over two-level inverters such as high-quality output, lower device ratings, and several others. While the classical topologies are still having applications in most of the key areas, there is a growing interest in newer multilevel topologies with an objective of reducing power semiconductor device count, gate drivers and/or isolated DC sources. In this paper, a comprehensive review of some of the recently proposed newer multilevel inverter topologies with the abovementioned objectives is presented. In this article, a detailed investigation in terms of total power semiconductor switch count, number of DC sources, passive component requirement, highest switch voltage rating, total standing voltage etc. has been presented.
102 citations
TL;DR: In this study, RSC-MLI configurations have been analysed and Modified selective harmonic elimination technique has been presented to control the magnitude of input DC-link and optimal switching angles.
Abstract: Multilevel inverters (MLIs) have been recognised to generate the voltage for power quality applications. Presently number of topological improvements have been reported in literature. In higher lev...
14 citations
Cites background from "A new multilevel inverter topology ..."
...RSC topology has been reported (Ajami et al. 2014; Babaei, Laali, and Bayat 2015; Beigi et al. 2012)....
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24 Jun 2015
TL;DR: In this paper, a comparison between four different types of pulse width modulation (PWM) techniques, namely, In-phase disposition (IPD), Anti-Phase disposition (APD), Carrier Overlap (CO), and Variable Frequency (VF) PWM methods, has been done.
Abstract: As compared to conventional inverter topologies like diode clamped and capacitor clamped inverters, the cascaded multilevel inverter has lesser harmonics as well as lower switching stress The cascaded topology has more number of power switches leading to greater heat losses, larger size, higher cost and more gate drive circuitry The proposed configuration contains less number of switches and produces lesser harmonics in the output voltage than the cascaded topology A comparison between four different types of pulse width modulation (PWM) techniques, namely, In-phase disposition (IPD), Anti-phase disposition (APD), Carrier Overlap (CO) and Variable Frequency (VF) PWM methods, has been done The results have been verified through simulation study in MATLAB/Simulink in order to select the best PWM method that provides minimum THD in the output voltage An LC filter has been designed to improve the harmonic profile
13 citations
TL;DR: The proposed grid tied photovoltaic system using modular multilevel inverter topology generates a nearly sinusoidal signal and achieves better output profile with low total harmonic distortion.
Abstract: A grid tied photovoltaic system using modular multilevel inverter topology is proposed in this paper. Basic unit structure of modular multilevel inverter used in this system is capable of converting DC power from PV array to AC power for feeding power to the household loads or utility grid. The proposed modular multilevel inverter structure has lesser power electronic devices compared to the existing multilevel inverter topologies. The proposed system generates a nearly sinusoidal signal and achieves better output profile with low total harmonic distortion. Simulation of the proposed system is carried out in MATLAB/Simulink software and the results are presented.
5 citations
Cites background from "A new multilevel inverter topology ..."
...The output voltage of MLI has low distortion and low harmonic content which reduces the size and cost of the filter and the level of electromagnetic interference (EMI) [12]....
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References
More filters
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
01 Jan 1980
TL;DR: In this article, a neutral-point-clamped PWM inverter composed of main switching devices which operate as switches for PWM and auxiliary switching devices to clamp the output terminal potential to the neutral point potential has been developed.
Abstract: A new neutral-point-clamped pulsewidth modulation (PWM) inverter composed of main switching devices which operate as switches for PWM and auxiliary switching devices to clamp the output terminal potential to the neutral point potential has been developed. This inverter output contains less harmonic content as compared with that of a conventional type. Two inverters are compared analytically and experimentally. In addition, a new PWM technique suitable for an ac drive system is applied to this inverter. The neutral-point-clamped PWM inverter adopting the new PWM technique shows an excellent drive system efficiency, including motor efficiency, and is appropriate for a wide-range variable-speed drive system.
4,432 citations
TL;DR: The neutral-point-clamped PWM inverter adopting the new PWM technique shows an excellent drive system efficiency, including motor efficiency, and is appropriate for a wide-range variable-speed drive system.
Abstract: A new neutral-point-clamped pulsewidth modulation (PWM) inverter composed of main switching devices which operate as switches for PWM and auxiliary switching devices to clamp the output terminal potential to the neutral point potential has been developed. This inverter output contains less harmonic content as compared with that of a conventional type. Two inverters are compared analytically and experimentally. In addition, a new PWM technique suitable for an ac drive system is applied to this inverter. The neutral-point-clamped PWM inverter adopting the new PWM technique shows an excellent drive system efficiency, including motor efficiency, and is appropriate for a wide-range variable-speed drive system.
4,328 citations
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
01 Jan 1992
TL;DR: In this paper, a multilevel commutation cell is introduced for high-voltage power conversion, which can be applied to either choppers or voltage-source inverters and generalized to any number of switches.
Abstract: The authors discuss high-voltage power conversion. Conventional series connection and three-level voltage source inverter techniques are reviewed and compared. A novel versatile multilevel commutation cell is introduced: it is shown that this topology is safer and more simple to control, and delivers purer output waveforms. The authors show how this technique can be applied to either choppers or voltage-source inverters and generalized to any number of switches.<>
1,202 citations