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Proceedings ArticleDOI: 10.1109/ICCPCT.2014.7054950

A novel single phase advanced multilevel inverter with adjustable amplitude of voltage levels

20 Mar 2014-pp 950-957
Abstract: In this paper a novel single phase advanced multilevel inverter (MLI) with adjustable amplitude of voltage levels is proposed. High frequency single switch along with inductor is used in this proposed multilevel inverter to adjust the amplitude of voltage levels. Low frequency switches are used to generate the required number of levels. The amplitude of voltage levels is adjustable by changing the duty ratio of high frequency switch. Conventional multilevel inverters required large number of power switches, clamping diodes, capacitors and input sources. The drawbacks of conventional multilevel inverters are overcome by proposed advanced multilevel inverter. In this paper, single phase 9-Level inverter with different amplitude of voltage levels is proposed using in-phase level shifting SPWM (sinusoidal pulse width modulation) technique. Proposed 9-level single phase MLI is designed for rated power 2kW, 24V input voltage and 0.8 modulation index. Total harmonic distortion (THD) of output voltage is calculated by FFT analysis window without filter and with filter. THD of proposed 9-level single phase MLI without LC filter and with LC filter is nearly 17.38% and 3.72% respectively. The proposed advanced 9-level single phase MLI is simulated in MATLAB/SIMULINK.

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Topics: Total harmonic distortion (57%), Pulse-width modulation (54%), LC circuit (54%) ...read more
Citations
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Open accessProceedings ArticleDOI: 10.1109/ICA-ACCA.2016.7778458
12 Dec 2016-
Abstract: A New breed of a buck boost converter, named as the XY converter family is proposed in this article. In the XY family, 16 topologies are presented which are highly suitable for renewable energy applications which require a high ratio of DC-DC converter; such as a photovoltaic multilevel inverter system, high voltage automotive applications and industrial drives. Compared to the traditional boost converter and existing recent converters, the proposed XY converter family has the ability to provide a higher output voltage by using less number of power devices and reactive components. Other distinct features of the XY converter family are i) Single control switch ii) Provide negative output voltage iii) Non-isolated topologies iv) High conversion ratio without making the use of high duty cycle and v) modular structure. XY family is compared with the recent high step-up converters and the detailed description of XY converter family and its topologies are presented. The simulation results are provided and it confirms the feasibility, functionality and validity of the concepts of the proposed XY converter family.

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Topics: Ćuk converter (69%), Buck–boost converter (68%), Boost converter (68%) ...read more

41 Citations


Proceedings ArticleDOI: 10.1109/ICA-ACCA.2016.7778453
01 Oct 2016-
Abstract: This article presents an inverting Nx multilevel boost converter (Inverting Nx MBC) with continuous input current for DC link applications where several negative voltage levels are required with self-balancing such as photovoltaic (PV) multilevel inverter systems. The voltage obtains from the photovoltaic array need to boost before a feed to inverter for practical utilization or grid connect. In this paper new inverting Nx multilevel Boost converter (Inverting Nx MBC) with mode of operation and conversion ratio is discussed in detail. The proposed converter provides negative N time output voltage of the traditional boost converter. The main feature of this topology provides negative high-conversion ratio without using a transformer, continuous input current, moderate duty cycle operation and modularity. The proposed converter topologies are a combination of traditional boost converters and Cockcroft Walton (CW) multiplier. In this topology, each device block only one voltage level. Hence, low voltage devices may be used. The simulation results are provided which validates the functionality of proposed converter topology.

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Topics: Boost converter (68%), Ćuk converter (66%), Buck–boost converter (65%) ...read more

20 Citations


Proceedings ArticleDOI: 10.1109/PEDES.2016.7914529
01 Dec 2016-
Abstract: In this treatise, 4Nx hybrid Non Inverting & Non Isolated (NI-NI) DC-DC interleaved multi-level boost converter (4Nx IMBC) for renewable energy applications is proposed. The proposed 4Nx IMBC is derived by coalescing the feature of 2Nx DC-DC Interleaved Multi-level Boost Converter (2Nx IMBC), voltage-lift-switched-inductor-modified (VLSIm Cell) and Cockcroft Walton (CW) voltage multipliers. The 4Nx converter provides 4N times more conversion voltage ratio compared to conventional boost converter where N denotes the number of output stages of the 4Nx IMBC. To make renewable energy sources applicable at user end its DC voltage magnitude needs to be incremented with high conversion. Existing and recently proposed DC-DC converter are not sufficiently expert to employ practically, because of stability issues, high duty cycle and high ripple in the output. To overcome the conversion ratio problem isolated boost DC-DC converter are in use but it makes circuitry bulky and costly because of transformer and several coupled inductors. The converter topology proposed in this treatise reduces the output ripple and overcome the problem mentioned above without exploiting extreme values of duty cycle or transformers. Simulations results of proposed circuitry are presented which verify the analysis, function, working modes & feasibility of proposed circuitry converter.

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Topics: Boost converter (68%), Ćuk converter (67%), Buck–boost converter (66%) ...read more

19 Citations


Book ChapterDOI: 10.1007/978-981-10-4394-9_1
01 Jan 2018-
Abstract: This article presents a new non-isolated DC-DC sextuple output hybrid triad converter configurations for high step-up renewable energy applications. Total 8 (eight) converters configurations are obtained by combining SEPIC/SI-SEPIC, Cuk/SI-Cuk, and Boost/SI-Boost which is highly suitable for step-up renewable applications where DC-DC multi-output converters/choppers are needed; such as a solar multilevel DC-AC converter (MLI), HVDC, hybrid/electric and electric vehicles. The most important characteristics of the proposed converter configurations are (i) only one power control semiconductor switch, (ii) offer six different DC outputs with different conversion ratio, (iii) non-isolated (without transformers) Converter topologies, (iv) high voltage at the output side without using large duty cycle and (v) modular DC-DC converter structure. The simulation results are presented and it validates the practicability, functionality, and the idea of suggested sextuple output hybrid triad converter configuration.

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Topics: Ćuk converter (65%), Converters (50%)

14 Citations


Open accessJournal ArticleDOI: 10.15623/IJRET.2015.0410062
Abstract: A multilevel inverter (MLI) is a popular inverter for solar based high power applications. The drawback of conventional H-bridge inverter is non-sinusoidal output voltage, which reduces the output quality of inverter. Later, the drawback of conventional Hbridge was overcome by conventional MLI. But, conventional MLI needs maximum number of diodes and switches. In order to overcome this drawback proposed MLI topology with level shifting sinusoidal pulse width modulation (SPWM) technique can be employed. Proposed MLI contain fewer number of switches and diodes, which helps in optimizing the circuit layout, reducing gate driver circuit for those switches. SPWM technique uses multicarrier waveforms with level shifting ensuring the reduction in total harmonics distortion (THD). In this Paper level shifting SPWM technique has been incorporated in which 5 kHz carrier wave is compare with 50Hz of sinusoidal wave with a modulation index of 0.8. THD of proposed 9-level inverter is 17.27% without filter and 4.29% with LC filter. Simulation of proposed inverter is carried out in MATLAB/SIMULINK.

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Topics: Inverter (57%), Total harmonic distortion (54%), Modulation index (51%) ...read more

4 Citations


References
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Journal ArticleDOI: 10.1109/TPEL.2008.2005192
Ebrahim Babaei1Institutions (1)
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.

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Topics: Ćuk converter (65%), Boost converter (64%), Forward converter (64%) ...read more

567 Citations


Journal ArticleDOI: 10.1109/TIE.2010.2064278
Abstract: This paper proposes a single-phase seven-level inverter for grid-connected photovoltaic systems, with a novel pulsewidth-modulated (PWM) control scheme. Three reference signals that are identical to each other with an offset that is equivalent to the amplitude of the triangular carrier signal were used to generate the PWM signals. The inverter is capable of producing seven levels of output-voltage levels (Vdc, 2Vdc/3, Vdc/3, 0, -Vdc, -2Vdc/3, -Vdc/3) from the dc supply voltage. A digital proportional-integral current-control algorithm was implemented in a TMS320F2812 DSP to keep the current injected into the grid sinusoidal. The proposed system was verified through simulation and implemented in a prototype.

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Topics: Inverter (55%), Pulse-width modulation (53%), DC bias (50%)

353 Citations


Proceedings ArticleDOI: 10.1109/IPEC.2010.5544625
Fang Zheng Peng1, Wei Qian1, Dong Cao1Institutions (1)
21 Jun 2010-
Abstract: Multilevel converters and inverters have become the enabling power conversion technology for high voltage high power applications in today's power systems and large motor drives. Although the neutral-point clamped (NPC, a 3-level) inverter was invented in 1979, the multilevel concept was not formally established until the early 1990s when the diode-clamped multilevel inverter, the capacitor-clamped (or flying capacitor) multilevel inverter, and the cascade multilevel inverter were proposed and fully studied. In this paper, we will first focus on the research advances in developing the cascade multilevel inverter topologies and their system configurations for power system applications from reviewing the traditional power conversion technology and the needs to eliminate zigzag transformers required in the traditional technology, to how to configure the cascade multilevel inverters to deal with unbalance and real-power (or active-power) flow. These research breakthroughs have made the cascade multilevel inverters a perfect topology for power system applications such as FACTS devices. For example, the cascade multilevel inverter based 75 Mvar and 50 Mvar STATCOMs have been reported. Since the mid of 1990s, many contributors have made great effort in developing more multilevel inverter topologies because all the three multilevel topologies have certain limitations and are not operable in some applications. Then, we will review the generalized multilevel inverter topology, its topological advances to other multilevel inverters/ converters, and their potential applications. This paper also provides insights to how multilevel inverter topologies are related to each other and their pros and cons in practical applications.

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Topics: Inverter (54%)

241 Citations


Open accessProceedings ArticleDOI: 10.1109/ISIE.2011.5984437
Sebastian Rivera1, Samir Kouro2, Bin Wu2, Jose I. Leon3  +2 moreInstitutions (3)
27 Jun 2011-
Abstract: Large scale grid connected photovoltaic (PV) energy conversion systems have reached the megawatt level. This imposes new challenges on existing grid interface converter topologies and opens new opportunities to be explored. In this paper a new medium voltage multilevel-multistring configuration is introduced based on a three-phase cascaded H-bridge (CHB) converter and multiple string dc-dc converters. The proposed configuration enables a large increase of the total capacity of the PV system, while improving power quality and efficiency. The converter structure is very flexible and modular since it decouples the grid converter from the PV string converter, which allows to accomplish independent control goals. The main challenge of the proposed configuration is to handle the inherent power imbalances that occur not only between the different cells of one phase of the converter but also between the three phases. The control strategy to deal with these imbalances is also introduced in this paper. Simulation results of a 7-level CHB for a multistring PV system are presented to validate the proposed topology and control method.

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204 Citations


Proceedings ArticleDOI: 10.1109/ICPCES.2012.6508041
01 Dec 2012-
Abstract: Multilevel inverters have been attracting in favor of academia as well as industry in the recent decade for high-power and medium-voltage energy control. In addition, they can synthesize switched waveforms with lower levels of harmonic distortion than an equivalently rated two-level converter. The multilevel concept is used to decrease the harmonic distortion in the output waveform without decreasing the inverter power output. This paper presents the most important topologies like diode-clamped inverter (neutral- point clamped), capacitor-clamped (flying capacitor), and cascaded multilevel with separate dc sources. This paper also presents the most relevant modulation methods developed for this family of converters: multilevel sinusoidal pulse width modulation, multilevel selective harmonic elimination, and space-vector modulation. Authors strongly believe that this survey article will be very much useful to the researchers for finding out the relevant references in the field of topologies and modulation strategies of multilevel inverter.

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Topics: Total harmonic distortion (55%), Pulse-width modulation (54%), Literature survey (54%) ...read more

158 Citations


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No. of citations received by the Paper in previous years
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