A New General Topology for Cascaded Multilevel Inverters With Reduced Number of Components Based on Developed H-Bridge
TL;DR: The performance and functional accuracy of the proposed topology using the new algorithm in generating all voltage levels for a 31-level inverter are confirmed by simulation and experimental results.
Abstract: In this paper, a new general cascaded multilevel inverter using developed H-bridges is proposed. The proposed topology requires a lesser number of dc voltage sources and power switches and consists of lower blocking voltage on switches, which results in decreased complexity and total cost of the inverter. These abilities obtained within comparing the proposed topology with the conventional topologies from aforementioned points of view. Moreover, a new algorithm to determine the magnitude of dc voltage sources is proposed. The performance and functional accuracy of the proposed topology using the new algorithm in generating all voltage levels for a 31-level inverter are confirmed by simulation and experimental results.
Citations
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TL;DR: Reduction in the number of power switches, driver circuits, and dc voltage sources is the advantage of the developed single-phase cascaded multilevel inverter, and the installation space and cost of the inverter are reduced.
Abstract: In this paper, a new single-phase cascaded multilevel inverter is proposed. This inverter is comprised of a series connection of the proposed basic unit and is able to only generate positive levels at the output. Therefore, an H-bridge is added to the proposed inverter. This inverter is called the developed cascaded multilevel inverter. In order to generate all voltage levels (even and odd) at the output, four different algorithms are proposed to determine the magnitude of dc voltage sources. Reduction in the number of power switches, driver circuits, and dc voltage sources is the advantage of the developed single-phase cascaded multilevel inverter. As a result, the installation space and cost of the inverter are reduced. These features are obtained by the comparison of the conventional cascaded multilevel inverters with the proposed cascaded topology. The ability of the proposed inverter to generate all voltage levels (even and odd) is reconfirmed by using the experimental results of a 15-level inverter.
444 citations
Cites background from "A New General Topology for Cascaded..."
...Digital Object Identifier 10.1109/TIE.2014.2336601 inverters consist of modularity, simplicity of control, and reliability, and they require the lowest number of power semiconductor devices to generate a particular level [1], [10], [11]....
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...In addition, lower switching losses, lower voltage stress of dv/dt on switches, and better electromagnetic interference are the other most important advantages of multilevel inverters [1]–[5]....
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TL;DR: A new single-phase cascaded multilevel inverter based on novel H-bridge units is proposed, able to increase the number of output voltage levels by using a lower number of power electronic devices such as switches, power diodes, driver circuits, and dc voltage sources that lead to reduction in installation space and cost of the inverter.
Abstract: In this paper, a new single-phase cascaded multilevel inverter based on novel H-bridge units is proposed. In order to generate all voltage levels (even and odd) at the output, nine different algorithms are proposed to determine the magnitudes of dc voltage sources. Then, the proposed algorithms are compared to investigate their advantages and disadvantages. This topology is able to increase the number of output voltage levels by using a lower number of power electronic devices such as switches, power diodes, driver circuits, and dc voltage sources that lead to reduction in installation space and cost of the inverter. In addition, in the proposed cascaded multilevel inverter, not only the number of required power electronic devices is reduced, but also the amount of the blocked voltage by switches, and the number of different voltage amplitudes of the used sources is decreased. These features are some of the most important advantages of the proposed topology. These features are obtained via the comparison of the proposed topology and its proposed algorithms with the conventional cascaded multilevel inverters that have been presented in the literatures. The operation and performances of the proposed topology with its presented algorithms in generating all voltage levels have been verified by using the experimental results of a 49-level single-phase inverter.
257 citations
Cites background from "A New General Topology for Cascaded..."
...The main disadvantage of the proposed basic unit over the H-bridge is its higher number of required dc voltage sources and power switches; however, this basic unit is able to generate seven different levels at the output, whereas three output levels are only generated in the H-bridge....
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TL;DR: In this paper, the authors proposed a new module for asymmetrical multilevel inverters with a low number of components, which is a square combination of two back-to-back T-type inverters and some other switches.
Abstract: This paper introduces a new module for asymmetrical multilevel inverters with a low number of components. The module is a square combination of two back-to-back T-type inverters and some other switches. A square T-type module produces 17 levels by 12 switches and 4 unequal dc sources (two 3 V DC and two 1 V DC). Also, it can be extended as a cascade connection in two strategies to achieve more levels. The module and its cascade connection are suitable for the applications in several dc sources systems such as photovoltaic farms, which lead to a modular topology with more voltage levels at higher voltages. Inherent creation of the negative voltage levels without any additional circuit (such as H-bridge circuit) is one of the main features of the proposed module. The low total harmonic distortion of the output voltage/current and low number of semiconductors are among the other advantages of the proposed module. A nearest level control method as a switching technique is used to produce high quality output voltage with lower harmonic contents. Simulations have been performed in MATLAB/Simulink and a prototype is implemented in the Power Electronics Laboratory; both the simulation and experimental results show a good performance.
246 citations
Cites background or methods from "A New General Topology for Cascaded..."
...[15], [16] presented a type of extended H-bridge with different numbers of DC links....
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...Group 2: novel H-bridge [16] CHB with trinary algorithm (VDC , 3VDC , 9VDC ....
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...I CHB (trinary) [28] Novel H-Bridge [16] ST-Type Mode....
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...II extension, CHB with trinary algorithm, and extend H-bridge [16] are satisfied mathematically and complexity in practical applications....
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...), novel H-bridge [16], and ST-Type in mode....
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TL;DR: In this article, a review of different reduced switch MLI topologies under three categories such as symmetric, asymmetric and hybrid configurations is presented, where the important knowledge on these topologies is carefully tabulated based on the three categories in the comparison tables to understand the essential parameters of the MLI.
Abstract: Recently multilevel inverters (MLI) have attracted more attention in research and industry, as they are changing into a viable technology for several applications. The concept of MLI was introduced for high power and high/medium voltage applications as they can provide an effective interface with renewable energy sources. Developing of reduced switch MLI topology has been a rapid research topic since the past decade, which has not been reviewed so far. Therefore, this review article focuses on the different reduced switch MLI topologies under three categories such as symmetric, asymmetric and hybrid configurations. The important knowledge on these topologies is carefully tabulated based on the three categories in the comparison tables to understand the essential parameters of the MLI topologies. These configurations are not only generating higher voltage levels to improve the power quality but also to reduce the passive filter requirements. Also, this review includes a detailed perspective of various modulation techniques and control strategies for MLI topologies. In addition to that, the different performance parameters of MLI and its calculation methods are discussed with appropriate mathematical expression. This review will help in the selection of appropriate MLI topology for FACTS, motor drives and renewable applications.
214 citations
TL;DR: A single-phase RS MLI topology is experimentally illustrated for different level generation using both fundamental and high switching frequency techniques which will help the readers to gain the utmost knowledge for advance research.
Abstract: Recently, multilevel inverters (MLIs) have gained lots of interest in industry and academia, as they are changing into a viable technology for numerous applications, such as renewable power conversion system and drives. For these high power and high/medium voltage applications, MLIs are widely used as one of the advanced power converter topologies. To produce high-quality output without the need for a large number of switches, development of reduced switch MLI (RS MLI) topologies has been a major focus of current research. Therefore, this review paper focuses on a number of recently developed MLIs used in various applications. To assist with advanced current research in this field and in the selection of suitable inverter for various applications, significant understanding on these topologies is clearly summarized based on the three categories, i.e., symmetrical, asymmetrical, and modified topologies. This review paper also includes a comparison based on important performance parameters, detailed technical challenges, current focus, and future development trends. By a suitable combination of switches, the MLI produces a staircase output with low harmonic distortion. For a better understanding of the working principle, a single-phase RS MLI topology is experimentally illustrated for different level generation using both fundamental and high switching frequency techniques which will help the readers to gain the utmost knowledge for advance research.
211 citations
Cites background from "A New General Topology for Cascaded..."
...Moreover the ability of generating more levels, less THD with a demand of less number of switches and dc sources makes the topology superior among other topologies developed in [40]–[42], [65], [67]....
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References
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20 Oct 2009
TL;DR: This paper serves as an introduction to the subject for the not-familiarized reader, as well as an update or reference for academics and practicing engineers working in the field of industrial and power electronics.
Abstract: Multilevel converters are considered today as the state-of-the-art power-conversion systems for high-power and power-quality demanding applications. This paper presents a tutorial on this technology, covering the operating principle and the different power circuit topologies, modulation methods, technical issues and industry applications. Special attention is given to established technology already found in industry with more in-depth and self-contained information, while recent advances and state-of-the-art contributions are addressed with useful references. This paper serves as an introduction to the subject for the not-familiarized reader, as well as an update or reference for academics and practicing engineers working in the field of industrial and power electronics.
949 citations
Additional excerpts
...The magnitudes of the dc voltage sources of the proposed 31-level inverter are recommended as follows: VL,1 =Vdc (19) VR,1 =2Vdc (20) VL,2 =5Vdc (21) VR,2 =10Vdc. (22) The proposed inverter can generate all negative and positive voltage levels from 0 to 15Vdc with steps of Vdc....
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01 Jan 2009
TL;DR: In this paper, the authors present a tutorial on multilevel converters, covering the operating principle, modulation methods, technical issues and industry applications for high power and power-quality demanding applications.
Abstract: Multilevel converters are considered today as the state-of-the-art power-conversion systems for high-power and power-quality demanding applications. This paper presents a tutorialonthistechnology,coveringtheoperatingprincipleand the different power circuit topologies, modulation methods, technical issues and industry applications. Special attention is given to established technology already found in industry with more in-depth and self-contained information, while recent advances and state-of-the-art contributions are addressed with useful references. This paper serves as an introduction to the subject for the not-familiarized reader, as well as an update or reference for academics and practicing engineers working in the field of industrial and power electronics.
928 citations
TL;DR: A new multilevel converter topology that has many steps with fewer power electronic switches results in reduction of the number of switches, losses, installation area, and converter cost.
Abstract: This paper introduces a new multilevel converter topology that has many steps with fewer power electronic switches. The proposed circuit consists of series-connected submultilevel converters blocks. The optimal structures of this topology are investigated for various objectives, such as minimum number of switches and capacitors, and minimum standing voltage on switches for producing maximum output voltage steps. A new algorithm for determination of dc voltage sourcespsila magnitudes has also been presented. The proposed topology results in reduction of the number of switches, losses, installation area, and converter cost. The operation and performance of the proposed multilevel converter has been verified by the simulation and experimental results of a single-phase 53-level multilevel converter.
645 citations
Additional excerpts
...…of output voltage levels (Nstep), number of switches (Nswitch), number of dc voltage sources (Nsource), and the maximum magnitude of the generated voltage (Vo,max) are calculated as follows, respectively: Nstep =2 2n+1 − 1 (1) Nswitch =4n+ 2 (2) Nsource =2n (3) Vo,max =VL,n + VR,n. (4) The other…...
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TL;DR: In this article, a new topology of cascaded multilevel inverter using a reduced number of switches, insulated gate driver circuits and voltage standing on switches is proposed, which results in reduction of installation area and cost and has simplicity of control system.
475 citations
Additional excerpts
...In recent years, several topologies with various control techniques have been presented for cascaded multilevel inverters [5]–[8]....
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...The main disadvantage of this structure is related to its bidirectional power switches, which cause an increase in the number of IGBTs and the total cost of the inverter....
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...The magnitudes of the dc voltage sources of the proposed 31-level inverter are recommended as follows: VL,1 =Vdc (19) VR,1 =2Vdc (20) VL,2 =5Vdc (21) VR,2 =10Vdc. (22) The proposed inverter can generate all negative and positive voltage levels from 0 to 15Vdc with steps of Vdc....
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TL;DR: A new topology for cascaded multilevel converter based on submultileVEL converter units and full-bridge converters is proposed, optimized for various objectives, such as the minimization of the number of switches, gate driver circuits and capacitors, and blocking voltage on switches.
Abstract: In this paper, a new topology for cascaded multilevel converter based on submultilevel converter units and full-bridge converters is proposed. The proposed topology significantly reduces the number of dc voltage sources, switches, IGBTs, and power diodes as the number of output voltage levels increases. Also, an algorithm to determine dc voltage sources magnitudes is proposed. To synthesize maximum levels at the output voltage, the proposed topology is optimized for various objectives, such as the minimization of the number of switches, gate driver circuits and capacitors, and blocking voltage on switches. The analytical analyses of the power losses of the proposed converter are also presented. The operation and performance of the proposed multilevel converter have been evaluated with the experimental results of a single-phase 125-level prototype converter.
471 citations
Additional excerpts
...The magnitudes of the dc voltage sources of the proposed 31-level inverter are recommended as follows: VL,1 =Vdc (19) VR,1 =2Vdc (20) VL,2 =5Vdc (21) VR,2 =10Vdc. (22) The proposed inverter can generate all negative and positive voltage levels from 0 to 15Vdc with steps of Vdc....
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