A new asymmetric multilevel inverter with reduced number of switches and reduction of harmonics using Sine Property
18 Mar 2016-pp 1-8
TL;DR: In this paper, a new topology named OTF (One-Two-Five) topology is proposed for an asymmetrical multilevel inverter, implemented with less number of switches compared with other conventional and recently invented topologies.
Abstract: In this paper, a new topology named OTF (One-Two-Five) topology is proposed for an asymmetrical multilevel inverter. The OTF topology is implemented with less number of switches compared with other conventional and recently invented topologies. The reduction of switches leads to low cost of the inverter. The reduction of the switches is usually associated with more number of levels achieved and reduced harmonic content. Sine Property is reviewed with the proposed topology to reduce the harmonics content. Simulation is performed for a 17 level inverter of the proposed topology using MATLAB/SIMULINK. Fast Fourier Transformation (FFT) analysis is performed and the results are verified.
Citations
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22 Aug 2011
TL;DR: The connection point in the first series circuit of switching devices is connected through a reactor to an input-output common connection line connected to one end of an AC power supply and the other end of the ACPower supply is connected to the connection point of capacitors.
Abstract: Provided is an electric power converter. A First and second series circuits of switching devices and a series circuit of capacitors are connected in parallel. Between the connection point in the first series circuit of switching devices and the connection point in the series circuit of capacitors, a first bidirectional switch is connected and, between the connection point in the second series circuit of switching devices and the connection point in the series circuit of capacitors, a second bidirectional switch is connected. The connection point in the first series circuit of switching devices is connected through a reactor to an input-output common connection line connected to one end of an AC power supply and the other end of the AC power supply is connected to the connection point in the series circuit of capacitors.
204 citations
TL;DR: In this article, a review of multilevel inverters (MLI) has been presented, focusing on various aspects of MLIs such as different configurations, modulation techniques, the concept of new reduced switch count MLI topologies, applications regarding interface with renewable energy, motor drives, and FACTS controller.
Abstract: In recent years, multilevel inverters (MLIs) have emerged to be the most empowered power transformation technology for numerous operations such as renewable energy resources (RERs), flexible AC transmission systems (FACTS), electric motor drives, etc. MLI has gained popularity in medium- to high-power operations because of numerous merits such as minimum harmonic contents, less dissipation of power from power electronic switches, and less electromagnetic interference (EMI) at the receiving end. The MLI possesses many essential advantages in comparison to a conventional two-level inverter, such as voltage profile enhancement, increased efficiency of the overall system, the capability of high-quality output generation with the reduced switching frequency, decreased total harmonic distortions (THD) without reducing the power of the inverter and use of very low ratings of the device. Although classical MLIs find their use in various vital key areas, newer MLI configurations have an expanding concern to the limited count of power electronic devices, gate drivers, and isolated DC sources. In this review article, an attempt has been made to focus on various aspects of MLIs such as different configurations, modulation techniques, the concept of new reduced switch count MLI topologies, applications regarding interface with renewable energy, motor drives, and FACTS controller. Further, deep insights for future prospective towards hassle-free addition of MLI technology towards more enhanced application for various fields of the power system have also been discussed. This article is believed to be extremely helpful for academics, researchers, and industrialists working in the direction of MLI technology.
22 citations
23 Mar 2019
TL;DR: A simple guide to calculate the firing angles for the operation of multilevel inverter for Nearest Level Modulation and Selective Harmonics Elimination which are the two very popular low switching frequency modulation schemes.
Abstract: Calculation of firing angles for the efficient operation of multilevel inverter is very important. This paper gives a simple guide to calculate the firing angles for the operation of multilevel inverter. The firing angles are calculated for Nearest Level Modulation and Selective Harmonics Elimination which are the two very popular low switching frequency modulation schemes. The modulation schemes are implemented on a Multilevel DC-link inverter to generate a nine level output. The simulation is carried out using Matlab/Simulink software. The Matlab code to calculate the THD is also presented. Hardware result is shown to validate the simulation results. The code to execute the firing pulse in Atmega32 AVR microcontroller is also presented.
14 citations
Cites background from "A new asymmetric multilevel inverte..."
...A symmetrical MLI employs dc voltage sources of equal magnitude, while an asymmetrical MLI employs unequal dc voltages sources [5]– [8]....
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20 Mar 2018
TL;DR: The various MLI topologies and the modulation techniques implemented on MLIs are reviewed and an easy understanding of the concepts that are conveyed by MLI is given.
Abstract: The advent of high power and medium power appliances has given substantial importance to Multilevel Inverters (MLI) in recent times. The MLI is widely used in driving AC loads which requires to be operated with low harmonics. In this paper, the various MLI topologies and the modulation techniques implemented on MLIs are reviewed. While reviewing the various MLI topologies, they are categorized into symmetrical type and asymmetrical type. All the existing MLIs topologies and those that are developed in future can be categorized into one of these two categories. A comprehensive review is done of these topologies to examine the various performance parameters. The modulation techniques are also classified into fundamental switching frequency (FSF) modulation techniques and high switching frequency (HSF) modulation techniques. This classification provides an easy understanding of the concepts that are conveyed by MLI. This paper also gives a broad understanding of the various features of each modulation technique.
9 citations
TL;DR: In this paper, a symmetric multi-level inverter structure with reduced number of power switches was proposed to reduce the switch count and reduce the control complexity of multilevel inverters.
Abstract: Multilevel inverters operate by synthesizing a desired voltage level in the output by using several DC sources in the input. Increasing the number of levels in the output leads to smaller output voltage steps, lower dv/dt, lower di/dt, less stress on the power devices, lower switching losses and less total harmonic distortion. With these characteristics, multilevel inverters are suitable in high power and high voltage applications. The main problem of multilevel inverters however is the high power switches count requirement. This paper proposes a new symmetric multi-level inverter structure with reduced number of power switches which in turn reduces the control complexity. It is capable of providing the desired output voltage levels, which in this paper an output of nine levels is considered but can be simply extended to higher levels depending on the application. A modified Pulse Width Modulation (PWM) control method with less number of carrier signals is also introduced for the new multilevel inverter structure. The performance of the proposed nine-level as established through simulation and experimental study is found to be in accordance to the theoretical perspective.
5 citations
References
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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
"A new asymmetric multilevel inverte..." refers background or methods in this paper
...The conventional topologies are diode clamped MLI, flying capacitor MLI and cascaded H bridge MLI [4]-[6]....
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...In [4], [6], [7] various PWM techniques have been proposed and implemented....
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TL;DR: A survey of different topologies, control strategies and modulation techniques used by cascaded multilevel inverters in the medium-voltage inverter market is presented.
Abstract: Cascaded multilevel inverters synthesize a medium-voltage output based on a series connection of power cells which use standard low-voltage component configurations. This characteristic allows one to achieve high-quality output voltages and input currents and also outstanding availability due to their intrinsic component redundancy. Due to these features, the cascaded multilevel inverter has been recognized as an important alternative in the medium-voltage inverter market. This paper presents a survey of different topologies, control strategies and modulation techniques used by these inverters. Regenerative and advanced topologies are also discussed. Applications where the mentioned features play a key role are shown. Finally, future developments are addressed.
2,111 citations
"A new asymmetric multilevel inverte..." refers methods in this paper
...The conventional topologies are diode clamped MLI, flying capacitor MLI and cascaded H bridge MLI [4]-[6]....
[...]
...In [4], [6], [7] various PWM techniques have been proposed and implemented....
[...]
TL;DR: It is shown that versatile stand-alone photovoltaic (PV) systems still demand on at least one battery inverter with improved characteristics of robustness and efficiency, which can be achieved using multilevel topologies.
Abstract: This paper shows that versatile stand-alone photovoltaic (PV) systems still demand on at least one battery inverter with improved characteristics of robustness and efficiency, which can be achieved using multilevel topologies. A compilation of the most common topologies of multilevel converters is presented, and it shows which ones are best suitable to implement inverters for stand-alone applications in the range of a few kilowatts. As an example, a prototype of 3 kVA was implemented, and peak efficiency of 96.0% was achieved.
593 citations
TL;DR: In this paper, the most common multilevel inverter topologies and control schemes have been reviewed, and the selection of topology and control techniques may vary according to power demands of inverter.
574 citations
"A new asymmetric multilevel inverte..." refers background in this paper
...The other proposed modulation techniques are space vector modulation, selective harmonic elimination, hysteresis current control [22]....
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...Apart from this, lower voltage stress on power switches, lower common mode voltage, and lower dv/dt ratio are some of the notable advantages of Multi Level Inverter (MLI) [2], [3], [22]....
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...A review of the existing modulation techniques is proposed in [22]....
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