A Novel Nine and Seventeen-Step Multilevel Inverters with Condensed Switch Count
09 Nov 2020-pp 9265852
TL;DR: This paper presents the design of a new single-Phase 9- and 17-level inverters with sinking the components with high reliability and reduced total harmonic distortion, and develops numerical modeling of the converters using MATLAB/Simulink block sets.
Abstract: This paper presents the design of a new single-Phase 9- and 17-level inverters with sinking the components. The 17-level inverter topology is designed by cascading the two nine-step inverters. The topology produces the complex number of output voltage levels with high reliability and reduced total harmonic distortion. We develop numerical modeling of the converters using MATLAB/Simulink block sets, and we realize experimental prototype in a laboratory-scale model using digital processor dSPACE RTI 1104. Set of experimental and numerical results are provided in this paperwork to ensure and validate the feasibility as per IEC standards. Proposed inverters are well apt for low/high voltage renewable and hybrid electric vehicle applications.
Citations
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TL;DR: In this article, the authors presented a novel topology for the single-phase 31-level asymmetrical multilevel inverter accomplished with reduced components count, which can be used for renewable energy applications.
Abstract: This paper presents a novel topology for the single-phase 31-level asymmetrical multilevel inverter accomplished with reduced components count. The proposed topology generates maximum 31-level output voltage with asymmetric DC sources with an H-bridge. The fundamental 13-level multilevel inverter (MLI) topology is realized, and further, the topology is developed for 31-level can be used for renewable energy applications. This reduces the overall components count, cost and size of the system. Rather than the many advantages of MLIs, reliability issues play a significant role due to higher components count to reduce THD. This is a vital challenge for the researchers to increase the reliability with less THD. Several parameters are analyzed for both fundamental 13-level and developed 31-level MLIs such as total standing voltage (TSV), cost function (CF) and power loss. The inverter is tested experimentally with various combinational loads and under dynamic load variations with sudden load disturbances. Total standing voltage with the cost function for the proposed MLI is compared with various topologies published recently and is cost-effective. A detailed comparison of several parameters with graphical representation is made. Less TSV and components requirement is observed for the proposed MLI. The obtained total harmonic distortion (THD) is under IEEE standards. The topology is simulated in MATLAB/Simulink and verified experimentally with a hardware prototype under various conditions.
30 citations
24 May 2021
TL;DR: In this article, a neutral point clamped boost symmetrical multilevel inverter is proposed for grid-connected and renewable energy applications, where the floating capacitor is connected between H-bridge inverter and neutral point, which increases voltage output and doubles the voltage at the load.
Abstract: This paper presents a design and implementation of a new neutral point clamped boost symmetrical multilevel inverter. The configuration obtained as the combination of DC sources, floating capacitor, and semiconductor power switches to generate a 7-level basic inverter. The floating capacitor is connected between H-bridge inverter and neutral point, which increases the voltage output and doubles the voltage at the load. To generate a greater number of voltage output levels with the thirteen-level symmetrical inverter is proposed with two basic 7-level inverters. The proposed 13-level inverter is tested with non-linear and linear loads. The 13-level inverter is stable under dynamic load changes and suits for grid-connected and renewable energy applications. Numerical results along with experimental developments are carried out in the laboratory scale environment for verifying the developed prediction with IEC standards.
1 citations
14 Dec 2022
TL;DR: In this article , the authors proposed a seventeen-level modified asymmetrical inverter topology to convert DC power which consists of solar photovoltaics, fuel cell or battery to AC power for industrial and domestic loads.
Abstract: Solar power plant replaces the conventional power generation due to the development of recent technologies and climate change. So, there is a need for appropriate inverter topology for integrating solar Photovoltaic system with the grid. Multilevel Inverter (MLI) is suitable for power transformation, which overcomes the limitations of square wave inverter such as Harmonic distortion, higher voltage stress and Electro Magnetic Interference (EMI). This paper proposes a seventeen-level modified asymmetrical inverter topology to convert DC power which consists of solar photovoltaics, fuel cell or battery to AC power for industrial and domestic loads. The proposed topology composes of nine IGBT semiconductor devices, one bidirectional switch and four asymmetrical solar PV System to produce seventeen level staircase type waveform and it is identical to sinusoidal shape. The pulse for the switches is produced by Nearest Voltage Level (NVL) algorithm which shows higher efficiency and reliability compared to other PWM techniques at the higher levels. The proposed topology for Solar PV system is validated by simulating in MATLAB/Simulink and harmonic spectrum of output current and voltage are analyzed. The Total Harmonic Distortion (THD) of current (I) is 0.35 % and voltage (V) is 1.33 % which follow IEEE519 standards.
TL;DR: In this article, a boost converter-based cascaded H-bridge (CHB) multilevel inverter with improved reliability for solar PV (photovoltaic) applications is presented.
Abstract: This study presents the boost converter-based cascaded H-bridge (CHB) multilevel inverter with improved reliability for solar PV (photovoltaic) applications. The solar PV is associated with the boost converter to enhance DC link voltage by using the maximum power point tracking-perturb and observe (MPPT-P & O) technique. The proposed configuration is aimed toward the performance analysis of the boost converter-based CHB MLI by reducing the number of components, low total harmonic distortion (THD), reduced power, less cost function, low total standing voltage (TSV), improved reliability, and switching losses for solar PV application. In this study, a CHB multilevel inverter is used to obtain stepped pure sinusoidal AC from the solar PV array. The proposed boost converter extracts maximum power and enhances higher DC link voltage which provides high efficiency. The boost converter is integrated with a 27-level CHB multilevel inverter to generate near-sinusoidal output voltage with lower THD. The inverter is tested with linear and nonlinear loads for robustness, and during dynamic loads, inverter is stable and well suited to grid-connected applications. A detailed comparison is presented on the component count and reliability aspects with existing MLIs and 27-level MLIs. The simulation outcomes of the implemented arrangement are presented with the help of MATLAB/Simulink, an experimental prototype is developed using a dSPACE RTI1104 controller and also tested in the research laboratory for checking the possibility of the implemented arrangement.
14 Dec 2022
TL;DR: In this paper , the authors proposed a seventeen-level modified asymmetrical inverter topology to convert DC power which consists of solar photovoltaics, fuel cell or battery to AC power for industrial and domestic loads.
Abstract: Solar power plant replaces the conventional power generation due to the development of recent technologies and climate change. So, there is a need for appropriate inverter topology for integrating solar Photovoltaic system with the grid. Multilevel Inverter (MLI) is suitable for power transformation, which overcomes the limitations of square wave inverter such as Harmonic distortion, higher voltage stress and Electro Magnetic Interference (EMI). This paper proposes a seventeen-level modified asymmetrical inverter topology to convert DC power which consists of solar photovoltaics, fuel cell or battery to AC power for industrial and domestic loads. The proposed topology composes of nine IGBT semiconductor devices, one bidirectional switch and four asymmetrical solar PV System to produce seventeen level staircase type waveform and it is identical to sinusoidal shape. The pulse for the switches is produced by Nearest Voltage Level (NVL) algorithm which shows higher efficiency and reliability compared to other PWM techniques at the higher levels. The proposed topology for Solar PV system is validated by simulating in MATLAB/Simulink and harmonic spectrum of output current and voltage are analyzed. The Total Harmonic Distortion (THD) of current (I) is 0.35 % and voltage (V) is 1.33 % which follow IEEE519 standards.
References
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TL;DR: The basic operation and the most used modulation and control techniques developed to date of neutral-point-clamped inverters are presented and some technological problems such as capacitor balance and losses are presented.
Abstract: Neutral-point-clamped (NPC) inverters are the most widely used topology of multilevel inverters in high-power applications (several megawatts). This paper presents in a very simple way the basic operation and the most used modulation and control techniques developed to date. Special attention is paid to the loss distribution in semiconductors, and an active NPC inverter is presented to overcome this problem. This paper discusses the main fields of application and presents some technological problems such as capacitor balance and losses.
1,556 citations
"A Novel Nine and Seventeen-Step Mul..." refers background in this paper
...A higher-level NPC converter entails a more significant number of diodes, which increases the complexity of the hardware scheme and the Neutral point voltage harmonizing process [14]–[16]....
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TL;DR: In this article, the authors evaluate three-level topologies as alternatives to two level topologies in converters for lowvoltage applications and compare them for a grid interface, a conventional drive application, and a high speed drive application.
Abstract: This paper evaluates three-level topologies as alternatives to two-level topologies in converters for low-voltage applications. Topologies, semiconductor losses, filter aspects, part count, initial cost, and life-cycle cost are compared for a grid interface, a conventional drive application, and a high-speed drive application.
536 citations
14 Apr 2017
TL;DR: Six family members of the modular multilevel cascade converters, intended for grid-tied applications and medium-voltage high-power motor drives are paid much attention.
Abstract: This paper provides a chronological overview of the topology for multilevel converters, and discusses their different terminology usages and characteristics. The multilevel converters include three-level neutral-point-clamped (NPC) and neutral-point-piloted (NPP) inverters, three-level and four-level flying-capacitor (FLC) inverters, and a family of modular multilevel cascade converters. Some have already been put into commercial use, some have been on a research and development stage, and others have been on an academic research stage. This paper pays much attention to six family members of the modular multilevel cascade converters, intended for grid-tied applications and medium-voltage high-power motor drives.
380 citations
TL;DR: In this paper, a closed-loop modified phase-shifted pulsewidth modulation (PS-PWM) control method by incorporating a novel balancing algorithm is proposed to adjust the switching times of selected switching states.
Abstract: The issue of voltage imbalance remains a challenge for the flying capacitor multilevel converter. The phase-shifted pulsewidth modulation (PS-PWM) method has a certain degree of self-balancing properties. However, the method alone is not sufficient to maintain balanced capacitor voltages in practical applications. The paper proposes a closed-loop modified PS-PWM control method by incorporating a novel balancing algorithm. The algorithm takes advantage of switching redundancies to adjust the switching times of selected switching states and thus maintaining the capacitor voltages balanced without adversely affecting the system's performance. Key techniques of the proposed control method, including selection of switching states, calculation of adjusting times for the selected states, and determination of new switching instants of the modified PS-PWM are described and analyzed. Simulation and experimental results are presented to confirm the feasibility of the proposed method
241 citations
TL;DR: In this paper, a new 9-level active neutral-point-clamped (9L ANPC) converter is proposed for the grid connection of large wind turbines (WTs) to improve the waveform quality of the converter output voltage and current.
Abstract: Wind power is one of the most promising emerging renewable energy technologies for distributed generation (DG). In this paper, a new nine-level active neutral-point-clamped (9L ANPC) converter is proposed for the grid connection of large wind turbines (WTs) to improve the waveform quality of the converter output voltage and current. Therefore, the bulky passive grid filters can be reduced or even removed. The topology, operating principles, control schemes, and main features, as well as semiconductor device selection of the proposed converter are presented in detail. The floating capacitor voltage control based on redundant switching states and capacitor prioritization is detailed. A comparison between the new topology and other existing 9L topologies is presented to illustrate the characteristics and performance of the new converter. The proposed 9L ANPC converter is studied in the case of the grid connection of a 6-MW WT without using passive grid filters in DG systems. Simulation and experiment results are presented to validate the proposed converter topology and control schemes. The proper operation and the compliance to the harmonic limit standards of the filterless grid-connected WT system are verified by simulation results.
194 citations
"A Novel Nine and Seventeen-Step Mul..." refers background in this paper
...It has projected an assortment of hybrid multistage converters to gain more voltage levels, Nine-step inverter topologies are proposed in [20]-[31] have been demonstrated to be suitable for renewable and HEV applications....
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...This paper suggests a novel enhanced staircase nine-step multilevel inverter unit that offers a further reduction of switches, DC sources and capacitor count and total harmonic distortion than [20]- [30]....
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