THD in Cascade Multilevel Inverter Symmetric and Asymmetric

Jimenez, Olga Lidia; Vargas, R.; Aguayo, J.; Arau, J.; Vela, G.; Claudio, A.

doi:10.1109/cerma.2011.53

Cited by 26 publications

(11 citation statements)

References 12 publications

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“…It is noteworthy to mention that if the voltage ratio between VC1 and VC2 is different from that stated in Equation (16), then Vout results with deformations and, as a pertinent consequence, some harmonics can be injected to the power grid. The harmonic distortion due to the imbalance of DC sources in DC/AC cascade-cell converter has been already studied [18]. As VC1 and VC2 depend of D1 and D2, a larger or shorter of the latter will deform Vout.…”

Section: Dc/ac Nine Levels Cascaded Cell Topologymentioning

confidence: 99%

Single DC-Sourced 9-level DC/AC Topology as Transformerless Power Interface for Renewable Sources

Rodriguez-Rodrıguez¹,

Venegas-Rebollar²,

Moreno-Goytia³

2015

Energies

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This paper introduces an advanced transformerless multilevel hybrid-conversion topology intended for the interconnection of renewable DC sources at small-scale. The most important contribution presented in this paper is the generation of two isolated DC sources from a single DC source without the use of any type of transformer. The DC sources feed a nine-level DC/AC hybrid cascade multilevel converter. This advanced topology is achieved by redesigning the conventional DC/DC Buck topology, attached to the multilevel converter, and embedding a suitable switching strategy along with a Field Programmable Gate Array (FPGA)-based control. The advantages of the proposed structure, when compared to other proposals in the literature, are higher efficiency, reduced number of power switches, and high power density derived of transformerless characteristic. As a way to highlight differences and advantages of this converter over other options recently available in the literature, this paper carries out a quantitative evaluation comparing the number of voltage levels and the number of elements involved in the structure of DC/AC multilevel converters. The mathematical model and control strategy of the converter are explained and analyzed by means of simulations. Finally experimental results, obtained from a laboratory-scale prototype, show the performance of the system and demonstrate its relative advantages.

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Section: Dc/ac Nine Levels Cascaded Cell Topologymentioning

confidence: 99%

Single DC-Sourced 9-level DC/AC Topology as Transformerless Power Interface for Renewable Sources

Rodriguez-Rodrıguez¹,

Venegas-Rebollar²,

Moreno-Goytia³

2015

Energies

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“…However, the symmetric CHB structure has definite merits in high-power applications due to fault tolerance/reliability and modularity. The recent trend is to use a symmetric MLI fed by a multipulse rectifier [12]- [13] for high-and medium-power applications in industry. Balance its floating capacitor.…”

Section: Fig 2 Circuit Diagram Of the Proposed Topology (Single-phamentioning

confidence: 99%

A New Self-Balancing Cascaded Multilevel Inverter for Level Doubling Application

Sukanya¹,

L.Priyanga²,

K.Janarthanan³

et al. 2015

IJAREEIE

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A novel level doubling network (LDN) based multilevel inverter (MLI) topology is proposed in this paper. The LDN takes only two switches, which is formed by half-bridge inverter to almost double the number of output voltage levels. The concept (of the proposed LDN) has the capability of self-balancing during positive and negative cycles without any closed-loop control/algorithm. The topology has uses a symmetric cascaded H-bridge MLI. The proposed self-balanced multilevel inverter has eliminates the harmonics level and reduces the number number of switches and losses; which has provide better results compares with conventional six bridge multilevel inverter. The simulation results are verified in MATLAB/SIMULINK model. KEYWORDS:Cascaded multilevel inverter developed H-bridge, multilevel inverter, level doubling network (LDN), self-balanced multilevel inverter (MLI), power quality. I.INTRODUCTIONMultilevel inverters offer various applications in voltage ranging from medium to high such as in renewable energy sources, industrial, laminators, blowers, fans, and conveyors. Small voltage step results in making the multilevel inverters withstand better voltage, lower harmonics, good electromagnetic compatibility, minimized switching loss, and better power quality[1] [2]. Cascaded multilevel inverters were developed in the initial stage. Later, diode-lamped MLI'S were developed followed by lying capacitor MLI'S. These three topologies utilize different mechanisms to produce the required output. the topology introduced first, that is, the CMLI, is simply series connection of Hbridges[4] [5]. The cascaded multilevel inverter has more advantages than other two topologies [6], [7], since it does not require any balancing capacitors and diodes. Cascaded inverter needs separate DC sources for each H-Bridge, hence there is no voltage balancing problem, but isolated DC sources are not readily available, this could be main drawback of this topology [3]. Cascaded topology requires more switches.

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“…Conventional multi-level inverters, such as diode clamped multi-level inverters [4][5][6][7], flying capacitor multi-level inverters [8][9][10][11], and CMLIs [12][13][14], have some drawbacks if the number of voltage levels increases. The cost of the switching components and capacitors increases quickly as the number of voltage levels grows, and it also happens to the complexity of their implementations [15]. The analytical comparison results of various topologies with various DC voltage ratios for CMLIs were presented in [16] by applying a harmonic elimination technique.…”

Section: Introductionmentioning

confidence: 99%