A new scheme of symmetric multilevel inverter with reduced number of circuit devices

Hosseini, Seyyed Hossein; Ravadanegh, Sajad Najafi; Karimi, Masoumeh; Naderi, Yahya; Oskuee, Mohammad Reza Jannati

doi:10.1109/eleco.2015.7394504

Cited by 8 publications

(5 citation statements)

References 18 publications

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“…This inverter is a series connection of two basic units with two unequal DC sources that can produce nine levels of output voltage steps using eight unidirectional power electronic switches and eight anti-parallel diodes, the switching states of this inverter is shown in Table I. It is worth noting that the switches in each inverter legs are working in a complementary way, such that when 11 T is on, 12 T is off accordingly and vice versa and it is the same for other legs also [3]. It is worth mentioning that to increase the number of levels that could be generated by this multilevel inverter to decrease total harmonic distortion (THD), the values of DC source magnitudes are unequal and calculated as (2), although there are several methods to calculate values of DC sources for multilevel converters, the one generating the maximum number of output voltage levels with the same number of DC sources and power electronic elements have been used in this paper [26].…”

Section: Power Electronic Convertermentioning

confidence: 99%

“…Multilevel inverters are among the most popular inverters especially for medium and high voltage applications. Multilevel inverters has been introduced by Nabae et al and has gained increasing attention between researchers for its unique characteristics such as higher output power quality, higher efficiency, low harmonic components, lower switching losses and lower di/dt or dv/dt, which is making multilevel inverters viable alternatives for most of the applications [1][2][3][4]. Many topologies and control methods are suggested for these inverters in different applications; some of these methods are concentrated on harmonic elimination such as selective harmonic elimination method (SHEM), due to applicability limitations, it is not a convenient method for real-time harmonic compensating applications [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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An optimized direct control method applied to multilevel inverter for microgrid power quality enhancement

Naderi

Hosseini

Zadeh

et al. 2019

International Journal of Electrical Power & Energy Systems

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Multifunctional DGs and active power filters have become a mature technology in recent years, so in this paper, an optimized current control method for a multilevel converter is proposed to overcome harmonic current tracking inefficiency of previous control methods in online harmonic compensation applications in microgrids. This control method is applicable for grid-connected inverter-based multifunctional Distributed Generation (DG) converters. It could also be used in active power filter applications which need high-speed reference tracking ability. Having the advantages of current control methods like hysteresis band control, proportional-integral PI and Proportional + Resonant (PR) control methods, it overcomes disadvantages of these methods especially in harmonic reference tracking as it will be discussed in detail. The main advantages of this method are the simplicity of implementation, calculation delay compensation and its fast response to changes. The power electronic circuit, operating principles, two-horizon predicted switching states of MLI, experimental results and applications of this control method will be discussed in the paper. For studying the feasibility of the control method, a prototype of this converter is tested in a microgrid platform.

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Section: Power Electronic Convertermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An optimized direct control method applied to multilevel inverter for microgrid power quality enhancement

Naderi

Hosseini

Zadeh

et al. 2019

International Journal of Electrical Power & Energy Systems

Self Cite

View full text Add to dashboard Cite

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“…The important point is the increasing growth of DG implementation both by individuals and electrical utilities. Nevertheless, in standalone usages the output voltage and current of DGs could be improved in the source of generation by means of some inverter switching methods, it is worth noting that because of these capabilities, multilevel inverters are one of the most interesting inverters for applying these switching methods, such as harmonic elimination methods [12][13][14][15][16]. By the increasing penetration of DGs in today's grid, power quality issues become more important and paying attention to this topic is inevitable.…”

Section: Introductionmentioning

confidence: 99%

An overview of power quality enhancement techniques applied to distributed generation in electrical distribution networks

Naderi

Hosseini

Zadeh

et al. 2018

Renewable and Sustainable Energy Reviews

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129

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-It is obvious that power quality is an important characteristic of today's distribution power systems as loadsbecome more sensitive on the other hand nonlinear loads are increasing in the electrical distribution system. Considering the distributed nature of harmonic loads, the need for distributed power quality improvement (PQI) is inevitable. From years ago, researchers have been working on various kinds of filters and devices to enhance the overall power quality of power system, but today the nature of distribution system has been changed and power electronic based DGs play an important role in distribution grids. In this paper, a thorough survey is done on power quality enhancement devices with emphasis on ancillary services of multi-functional DGs. A literature review is also done on microgrids concept, testbeds and related control methods. Although there were some applications of DGs for PQI improvement these applications were not defined multi-functional DGs. Various control methods are studied and categorized regarding different viewpoints in the literature. Finally, a couple of thorough comparisons are done between the available techniques considering the nature, capabilities, advantages and implementation costs.

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“…V is the required fundamental component in per unit and substitute from equation (5). It varies from zero to one.…”

Section: Thd Minimizationmentioning

confidence: 99%

An Efficient Method for THD Minimization in Multilevel Inverter’s

Varzeghan¹,

Oskuee²,

Eyvazizadeh³

2016

ijeei

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In this paper, minimization of total harmonic distortion (THD) is discussed for the output voltage of multilevel inverter. THD minimization is an efficient method in reduction of the harmonic components of the inverter's output voltage. In multilevel inverters, the switching angles can be selected in a way that the output voltage THD will be minimized. Given that THD minimization is an optimization problem, intelligent algorithm is found to be an appropriate alternative in this regard. Shuffled Frog Leaping Algorithm and Harmony Search Algorithm are employed to find optimum switching angles to generate desired voltage value in the possible minimum THD. The obtained results of two algorithms are compared with each other to determine that which algorithm is more efficient in this regard. Also, both simulation and experimental results indicate superiority of this approach over the published work using GA in this concept. The experiments are conducted on a seven-level inverter to validate the feasibility of presented approach. IntroductionIn the recent years, power electronics engineers have centralized their attention to multilevel inverters. Compared to conventional two level inverters, stepwise output voltage is the basic advantage of multilevel inverters. This advantage will have some results such as better Electromagnetic Capability (EMC), lower switching losses, higher power quality, reduction of dv/dt stresses, lower total harmonic distortion (THD), needlessness of a transformer at distribution voltage and lower rating on power semiconductor switches [1][2][3][4][5]. Due to the advantages mentioned above for multilevel inverters, they are employed in many applications such as: distributed generation [6], micro grids [7][8], FACTs devices [9], High Voltage Direct Current (HVDC) [10], and electrical vehicles [11][12]. Multilevel inverters are mainly classified into three configurations which are the flying capacitor [13], diode clamped [14][15] and cascaded multilevel inverters [16]. Multilevel inverters are divided into two categories from the aspect of DC source value, which are called symmetric and asymmetric topologies. For DC voltage sources, capacitors, batteries and renewable energy sources can be implemented. In symmetric topology all DC sources have the same value but in asymmetric topology they have different values. Asymmetric multilevel inverters generate higher number of voltage steps for a definite number of switches compared to symmetric ones. The stepwise output voltage of multilevel inverters composed by a number of DC voltage sources [17]. An increase in the number of steps, will lead to generation of a near sinusoidal output voltage of multilevel inverter. This results in a considerable reduction in output voltage THD. Nevertheless, problems such as voltage unbalance, circuit layout and voltage clamping, limit the possible number of levels. Consequently, reducing the THD of output voltage waveform is a vital issue in designing useful and efficient multilevel inverters. Hence, impro...

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A new scheme of symmetric multilevel inverter with reduced number of circuit devices

Cited by 8 publications

References 18 publications

An optimized direct control method applied to multilevel inverter for microgrid power quality enhancement

An optimized direct control method applied to multilevel inverter for microgrid power quality enhancement

An overview of power quality enhancement techniques applied to distributed generation in electrical distribution networks

An Efficient Method for THD Minimization in Multilevel Inverter’s

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