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Proceedings ArticleDOI

A review of various multilevel inverter topologies with reduced component count

20 Mar 2018-pp 234-239
TL;DR: A comparative study of these architectures in terms of the controller and the loads used by them has been tabulated and various modulation techniques used by these topologies are also discussed.
Abstract: In the recent years, newer topologies of multilevel inverters have been developed with reduced number of power electronic devices and their features have been highlighted. These topologies are divided into three categories of symmetric, asymmetric and hybrid and their numerous characteristics are tabulated. These configurations are capable of generating higher voltage levels and they have minimized the usage of passive filters to a great extent. A comparative study of these architectures in terms of the controller and the loads used by them has been tabulated. The popularly used modulation techniques are also mentioned. The usage of separate DC sources makes it possible to be used for renewable energy applications. And various modulation techniques used by these topologies are also discussed.
Citations
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28 Aug 2009
TL;DR: In this article, a novel H-bridge multilevel PWM converter topology based on a series connection of a high voltage (HV) diode-clamped inverter and a low voltage (LV) conventional inverter is proposed.
Abstract: A novel H-bridge multilevel PWM converter topology based on a series connection of a high voltage (HV) diode-clamped inverter and a low voltage (LV) conventional inverter is proposed. A DC link voltage arrangement for the new hybrid and asymmetric solution is presented to have a maximum number of output voltage levels by preserving the adjacent switching vectors between voltage levels. Hence, a fifteen-level hybrid converter can be attained with a minimum number of power components. A comparative study has been carried out to present high performance of the proposed configuration to approach a very low THD of voltage and current, which leads to the possible elimination of output filter. Regarding the proposed configuration, a new cascade inverter is verified by cascading an asymmetrical diode-clamped inverter, in which nineteen levels can be synthesized in output voltage with the same number of components. To balance the DC link capacitor voltages for the maximum output voltage resolution as well as synthesise asymmetrical DC link combination, a new Multi-output Boost (MOB) converter is utilised at the DC link voltage of a seven-level H-bridge diode-clamped inverter. Simulation and hardware results based on different modulations are presented to confirm the validity of the proposed approach to achieve a high quality output voltage.

23 citations

Journal ArticleDOI
20 Dec 2022-Energies
TL;DR: In this article , a relative analysis of the reduced DC source count and switch inverter topologies highlight its significant benefits, which include control complexity, switch count, source count, reliability, efficiency, cost, voltage stress, total harmonic distortion (THD), and power quality.
Abstract: Due to cutting-edge innovations in industry and academia, research is more centered around multilevel inverters (MLIs), which play a significant role in different high/medium voltage and high-power applications when contrasted with traditional inverters. Relative analysis of the reduced DC source count and switch inverter topologies highlight its significant benefits, which include control complexity, switch count, source count, reliability, efficiency, cost, voltage stress, total harmonic distortion (THD), and power quality. When switched-capacitor technology is deployed, it is seen that with the assistance of 14 switches, a 53 level result is accomplished, and the THD is just around 1.41%, which is kept up with as per the IEEE 519-2014 norms. Whenever cascaded MLI topology is employed, the inversion efficiency is more prominent, and is about 99.06%. Hence, this review focuses on a few of the late-evolved MLIs utilized, and the benefits and drawbacks for different topologies are examined. To assist with current modern research in this field and the decision of the proper inverter for various applications, a novel topology of an MLI can be planned later on. Different setups of MLIs have been exhaustively covered and reviewed.

1 citations

Journal ArticleDOI
TL;DR: Kunci et al. as discussed by the authors proposed a multilevel inverter (MLI) that merupakan salah satu jenis inverter ying memiliki gelombang tegangan keluaran bertingkat.
Abstract: Multilevel Inverter (MLI) merupakan salah satu jenis inverter yang memiliki gelombang tegangan keluaran bertingkat. Meskipun lebih baik dari inverter konvensional, MLI yang beroperasi pada frekuensi rendah masih mengandung harmonisa orde rendah pada tegangan dan arus keluaran yang berdampak negatif pada sistem kelistrikan. Untuk mengatasi masalah ini, banyak peneliti telah mengembangkan berbagai teknik kontrol dan pada modulasi inverter untuk mengurangi harmonisa dan meminimalkan kerugian penyaklaran dengan tujuan mengoptimalkan efisiensi inverter. Selective harmonic elimination pulse-width modulation (SHEPWM) adalah kontrol paling optimal dari semua metode yang telah dikembangkan untuk menghilangkan harmonisa orde rendah dari tegangan keluaran inverter. Namun, ada tantangan dalam proses analisis MLI menggunakan SHEPWM karena penyelesaian persamaan yang sulit. Bio-inspired intelligent algorithms (BIA) digunakan untuk memecahkan masalah ini. Paper ini menjelaskan secara lengkap review dari berbagai penelitian yang telah dilakukan sebelumnya terkait dengan prinsip operasi sembilan jenis BIA dan aplikasinya dalam mereduksi harmonisa. Kesimpulan dibuat berdasarkan informasi yang diambil dari literatur. Semua informasi penting dalam paper ini mengenai reduksi harmonisa pada MLI akan membantu penelitian di masa depan untuk merancang sistem konversi daya yang efisien. Kata Kunci— Bio-inspired algorithm, harmonisa, multilevel inverter, optimalisasi, selective harmonic elimination.

1 citations

Journal ArticleDOI
TL;DR: In this paper , the authors present a set of review criteria that can be used as a guide for future multiport modular multilevel modular converters (MPMMCs).
Abstract: Distributed generation and storage systems have become important in the residential building environment. One of the more promising power electronic interfaces between these systems and the grid/building are multiport modular multilevel converters (MPMMCs). These converters can potentially improve efficiency and flexibility, however their control can pose challenges. Here, MPMMC topologies will be reviewed and analysed from a control standpoint (i.e. what control structures they require and what control outcomes they can achieve). This paper first determines a criteria for selecting a MPMMC for a residential building. It then presents a set of review criteria that can be used as guide for future multiport multilevel modular converters. It then applies these review criteria to analyse the converters that passed the selection criteria. Based on a detailed comparison of these topologies an appropriate multiport modular multilevel solution can be arrived at for a given application.
Journal ArticleDOI
TL;DR: In this article , the authors present a literature survey of more than twenty years on AC/DC multilevel converters with reduced switch count, in which some power switches can be removed letting only diodes.
Abstract: This paper presents a literature survey of more than twenty years on AC/DC multilevel converters with reduced switch count, in which some power switches can be removed letting only diodes. This simplification reduces the number of gate drivers, cost and complexity of the system. In this work, the considered topologies are derived from the conventional multilevel configurations on literature: Neutral Point Clamped, Cascaded H-Bridge, Flying Capacitor, Modular Multilevel Converter and T-Type. This article is divided in five sections, each one with papers with topologies derived from the five multilevel configurations previously mentioned. In each section, there are up to a maximum of four subsections, considering the main focus of each paper and contribution: derived and hybrid topologies, control techniques, analysis and hardware and design. At the end of each section, a summary table concerning the referenced papers is shown containing comparison information among the presented references in terms of: number of components per phase of the studied converter, applied modulation technique, applied control technique, suggested application given by the authors, converter’s output power considered and the respective efficiency considering this point of operation. With this extensive bibliography work, this paper serves as a very good reference to researchers interested in the topic to initiate their work or to update their studies. Also, the applications suggested by the authors give a direction of which topologies fit best different applications.
References
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Journal ArticleDOI
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


"A review of various multilevel inve..." refers background or methods in this paper

  • ...It is used to calculate two important parameters of the multilevel inverters which are the switching losses and the total harmonic distortion(THD)[7,14,15]....

    [...]

  • ...In the recent years, many types and variations of the multilevel converter topologies have been reported in literature[2,6,15]....

    [...]

  • ...However to reduce the number of separate dc voltage sources, various configurations have been suggested in[9,10] and some other topologies uses capacitors instead of dc sources[11-17]....

    [...]

Proceedings ArticleDOI
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


"A review of various multilevel inve..." refers background in this paper

  • ...The basic multilevel inverters topologies available in literature are Neutral point clamped[3], Flying capacitor[4] and Cascade H-bridge multilevel inverter [5]....

    [...]

  • ...The three basic topologies are the neutral point clamped (NPC) or diode clamped, the flying capacitor (FC) or capacitor clamped, and the cascaded H-bridge (CHB), each of them was first mentioned in [3,4,7]....

    [...]

Journal ArticleDOI
TL;DR: This paper covers the high-power voltage-source inverter and the most used multilevel-inverter topologies, including the neutral-point-clamped, cascaded H-bridge, and flying-capacitor converters.
Abstract: This paper presents a technology review of voltage-source-converter topologies for industrial medium-voltage drives. In this highly active area, different converter topologies and circuits have found their application in the market. This paper covers the high-power voltage-source inverter and the most used multilevel-inverter topologies, including the neutral-point-clamped, cascaded H-bridge, and flying-capacitor converters. This paper presents the operating principle of each topology and a review of the most relevant modulation methods, focused mainly on those used by industry. In addition, the latest advances and future trends of the technology are discussed. It is concluded that the topology and modulation-method selection are closely related to each particular application, leaving a space on the market for all the different solutions, depending on their unique features and limitations like power or voltage level, dynamic performance, reliability, costs, and other technical specifications.

2,254 citations

Journal ArticleDOI
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

Proceedings ArticleDOI
08 Oct 1995
TL;DR: A new multilevel voltage-source inverter with separate DC sources is proposed for high-voltage, high power applications, such as flexible AC transmission systems (FACTS) including static VAr generation (SVG), power line conditioning, series compensation, phase shifting, voltage balancing, fuel cell and photovoltaic utility systems interfacing, etc.
Abstract: A new multilevel voltage-source inverter with separate DC sources is proposed for high-voltage, high-power applications, such as flexible AC transmission systems (FACTS) including static VAr generation (SVG), power-line conditioning, series compensation, phase shifting, voltage balancing, fuel cell, and photovoltaic utility systems interfacing, etc. The new M-level inverter consists of (M-1)/2 single-phase full bridges in which each bridge has its own separate DC source. This inverter can generate almost sinusoidal waveform voltage with only one time switching per cycle as the number of levels increases. It can solve the size-and-weight problems of conventional transformer-based multipulse inverters and the component-counts problems of multilevel diode-clamp and flying-capacitor inverters. To demonstrate the superiority of the new inverter, an SVG system using the new inverter topology is discussed through analysis, simulation, and experiment.

1,024 citations